Make most of functions const correct (#714)

* Make most of the functions const correct

Used clang-tidy and sonarlint to help find places where const could
pretty easily applied. Also lot of hand work.

This commit does not yet touch handlers and typedefs of those.

* Fix Arduino uno handler_who_is() has extra parenthesis

For some reason there is extra parenthesis. Remove it this is more
likely buildable.

* Bugfix/bacapp: Fix uninitilized array_index

We have changed bacapp_snprintf_value() to be const correct. After that
we got

```
/home/runner/work/bacnet-stack/bacnet-stack/src/bacnet/bacapp.c:3183:27: warning: 4th function call argument is an uninitialized value [core.CallAndMessage]
                ret_val = bacapp_snprintf_weeklyschedule(
                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
```

So analyzer could now spot that we do not actually initilize array_index
at all. Fix this by setting array_index to zero. Note that I actually do
not know if zeroing is right thing to do here. I choose zero as if this
has worked before it is most likely that it will work with zero value.

* cmake: Add and ignore Wwrite-strings compiler option

Wwrite-strings helps find places where const correctness is broken.

Example it will warn about these

```C

void func1(char* str);

func("test") /* "test" is const so we should not pass it to func1().

char* func2()
{
  return "test"; /* func2() should return const char*.
}
```

We still need to ignore it as not all are fixed but let's add it already
so we remember that it should be opened at some point.

---------

Co-authored-by: Kari Argillander <kari.argillander@fidelix.com>

CMakeLists.txt

@@ -112,6 +112,7 @@ if (CMAKE_C_COMPILER_ID MATCHES "Clang" OR CMAKE_C_COMPILER_ID MATCHES "AppleCla
   add_compile_options(-Wswitch-default)
   add_compile_options(-Wunused-variable)
   add_compile_options(-Wcast-qual)
+  add_compile_options(-Wwrite-strings)
 
   # Don't warn about conversion, sign, compares since they are common in
   # embedded
@@ -138,6 +139,7 @@ if (CMAKE_C_COMPILER_ID MATCHES "Clang" OR CMAKE_C_COMPILER_ID MATCHES "AppleCla
   add_compile_options(-Wno-float-conversion)
   add_compile_options(-Wno-missing-declarations)
   add_compile_options(-Wno-unused-but-set-variable)
+  add_compile_options(-Wno-write-strings)
 elseif(MSVC)
   add_compile_options(/Wall)
 

apps/abort/main.c

@@ -74,14 +74,14 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s [abort-reason [invoke-id [server]]]\n", filename);
     printf("       [--dnet][--dadr][--mac]\n");
     printf("       [--version][--help]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Send BACnet Abort message to the network.\n");
     printf("--mac A\n"
@@ -123,7 +123,7 @@ int main(int argc, char *argv[])
     bool specific_address = false;
     int argi = 0;
     unsigned int target_args = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     filename = filename_remove_path(argv[0]);
     for (argi = 1; argi < argc; argi++) {

apps/ack-alarm/main.c

@@ -141,7 +141,7 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s device-id process-id\n"
            "    event-object-type event-object-instance event-state-acked\n"
@@ -151,7 +151,7 @@ static void print_usage(char *filename)
     printf("       [--version][--help]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Send BACnet AcknowledgedAlarm, message to a device.\n");
     printf("device-id:\n"
@@ -222,7 +222,7 @@ int main(int argc, char *argv[])
     bool specific_address = false;
     int argi = 0;
     unsigned int target_args = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     filename = filename_remove_path(argv[0]);
     for (argi = 1; argi < argc; argi++) {

apps/add-list-element/main.c

@@ -137,7 +137,7 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s device-instance object-type object-instance "
            "property array-index tag value\n",
@@ -146,7 +146,7 @@ static void print_usage(char *filename)
     printf("       [--version][--help][--verbose]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Add a BACnetLIST element to a property of an object\n"
            "in a BACnet device.\n");
@@ -244,7 +244,7 @@ int main(int argc, char *argv[])
     bool specific_address = false;
     unsigned int target_args = 0;
     int argi = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     filename = filename_remove_path(argv[0]);
     for (argi = 1; argi < argc; argi++) {

apps/apdu/main.c

@@ -123,7 +123,7 @@ static void init_service_handlers(void)
 /**
  * @brief Print the usage message
  */
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s", filename);
     printf(" <device-instance> <hex-ASCII>\n");
@@ -135,7 +135,7 @@ static void print_usage(char *filename)
 /**
  * @brief Print the help message
  */
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Send an arbitrary BACnet APDU to a device.\n");
     printf("\n");
@@ -199,7 +199,7 @@ static void print_help(char *filename)
  * @param buffer_len [in] The size of the buffer.
  */
 static void Send_APDU_To_Network(
-    BACNET_ADDRESS *target_address, uint8_t *buffer, size_t buffer_len)
+    BACNET_ADDRESS *target_address, const uint8_t *buffer, size_t buffer_len)
 {
     int pdu_len = 0;
     int bytes_sent = 0;
@@ -288,7 +288,7 @@ int main(int argc, char *argv[])
     bool found = false;
     int argi = 0;
     unsigned int target_args = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
     bool repeat_forever = false;
     long retry_count = 1;
 

apps/blinkt/device.c

@@ -462,7 +462,7 @@ bool Device_Object_Name(
     return status;
 }
 
-bool Device_Set_Object_Name(BACNET_CHARACTER_STRING *object_name)
+bool Device_Set_Object_Name(const BACNET_CHARACTER_STRING *object_name)
 {
     bool status = false; /*return value */
 
@@ -1198,7 +1198,7 @@ int Device_Read_Property_Local(BACNET_READ_PROPERTY_DATA *rpdata)
  * @return The length of the APDU on success, else BACNET_STATUS_ERROR
  */
 static int Read_Property_Common(
-    struct object_functions *pObject, BACNET_READ_PROPERTY_DATA *rpdata)
+    const struct object_functions *pObject, BACNET_READ_PROPERTY_DATA *rpdata)
 {
     int apdu_len = BACNET_STATUS_ERROR;
     BACNET_CHARACTER_STRING char_string;

apps/blinkt/main.c

@@ -343,7 +343,7 @@ int main(int argc, char *argv[])
     unsigned int target_args = 0;
     uint32_t device_id = BACNET_MAX_INSTANCE;
     int argi = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     filename = filename_remove_path(argv[0]);
     for (argi = 1; argi < argc; argi++) {

apps/create-object/main.c

@@ -175,7 +175,7 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf(
         "Usage: %s device-instance object-type [object-instance]\n", filename);
@@ -183,7 +183,7 @@ static void print_usage(char *filename)
     printf("       [--version][--help][--verbose]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Create an object in a BACnet device.\n");
     printf("\n");
@@ -232,7 +232,7 @@ int main(int argc, char *argv[])
     bool specific_address = false;
     unsigned int target_args = 0;
     int argi = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     filename = filename_remove_path(argv[0]);
     for (argi = 1; argi < argc; argi++) {

apps/dcc/main.c

@@ -116,13 +116,13 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s device-instance state [timeout [password]]\n", filename);
     printf("       [--version][--help]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf(
         "Send BACnet DeviceCommunicationControl service to device.\n"
@@ -155,7 +155,7 @@ int main(int argc, char *argv[])
     uint8_t invoke_id = 0;
     bool found = false;
     int argi = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     filename = filename_remove_path(argv[0]);
     for (argi = 1; argi < argc; argi++) {

apps/delete-object/main.c

@@ -136,7 +136,7 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s device-instance object-type object-instance\n",
         filename);
@@ -144,7 +144,7 @@ static void print_usage(char *filename)
     printf("       [--version][--help][--verbose]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Create an object in a BACnet device.\n");
     printf("\n");
@@ -193,7 +193,7 @@ int main(int argc, char *argv[])
     bool specific_address = false;
     unsigned int target_args = 0;
     int argi = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     filename = filename_remove_path(argv[0]);
     for (argi = 1; argi < argc; argi++) {

apps/epics/main.c

@@ -710,7 +710,7 @@ static void BuildPropRequest(BACNET_READ_ACCESS_DATA *rpm_object)
  *         of the property list.
  */
 static uint8_t Read_Properties(
-    uint32_t device_instance, BACNET_OBJECT_ID *pMyObject)
+    uint32_t device_instance, const BACNET_OBJECT_ID *pMyObject)
 {
     uint8_t invoke_id = 0;
     struct special_property_list_t PropertyListStruct;
@@ -884,7 +884,7 @@ static EPICS_STATES ProcessRPMData(
     return nextState;
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s [-v] [-d] [-p sport] [-t target_mac [-n dnet]]"
            " device-instance\n",
@@ -892,7 +892,7 @@ static void print_usage(char *filename)
     printf("       [--version][--help]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     (void)filename;
     printf("Generates Full EPICS file, including Object and Property List\n");
@@ -921,7 +921,7 @@ static int CheckCommandLineArgs(int argc, char *argv[])
     int i;
     bool bFoundTarget = false;
     int argi = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     filename = filename_remove_path(argv[0]);
     for (argi = 1; argi < argc; argi++) {

apps/error/main.c

@@ -75,7 +75,7 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s [error-class error-code service-number invoke-id]\n",
         filename);
@@ -83,7 +83,7 @@ static void print_usage(char *filename)
     printf("       [--version][--help]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Send BACnet Error message to the network.\n");
     printf("--mac A\n"
@@ -125,7 +125,7 @@ int main(int argc, char *argv[])
     bool specific_address = false;
     int argi = 0;
     unsigned int target_args = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     filename = filename_remove_path(argv[0]);
     for (argi = 1; argi < argc; argi++) {

apps/event/main.c

@@ -141,7 +141,7 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s device-id process-id initiating-device-id\n"
            "    event-object-type event-object-instance\n"
@@ -154,7 +154,7 @@ static void print_usage(char *filename)
     printf("       [--version][--help]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Send BACnet ConfirmedEventNotification message to a device.\n");
     printf("device-id:\n"
@@ -246,7 +246,7 @@ int main(int argc, char *argv[])
     bool specific_address = false;
     int argi = 0;
     unsigned int target_args = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
     unsigned found_index = 0;
 
     filename = filename_remove_path(argv[0]);

apps/getevent/main.c

@@ -160,7 +160,7 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static int print_help(char *exe_name)
+static int print_help(const char *exe_name)
 {
     printf("Usage:\n"
            "\n"

apps/iam/main.c

@@ -78,7 +78,7 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s [device-instance vendor-id max-apdu segmentation]\n",
         filename);
@@ -86,7 +86,7 @@ static void print_usage(char *filename)
     printf("       [--version][--help]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Send BACnet I-Am message for a device.\n");
     printf("--mac A\n"
@@ -149,7 +149,7 @@ int main(int argc, char *argv[])
     unsigned timeout = 100; /* milliseconds */
     int argi = 0;
     unsigned int target_args = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
     long retry_count = 0;
 
     filename = filename_remove_path(argv[0]);

apps/iamrouter/main.c

@@ -75,13 +75,13 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s DNET [DNET] [DNET] [...]\n", filename);
     printf("       [--version][--help]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Send BACnet I-Am-Router-To-Network message for \n"
            "one or more networks.\n"
@@ -99,7 +99,7 @@ int main(int argc, char *argv[])
 {
     unsigned arg_count = 0;
     int argi = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     filename = filename_remove_path(argv[0]);
     for (argi = 1; argi < argc; argi++) {

apps/initrouter/main.c

@@ -211,13 +211,13 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s address [DNET ID Len Info]\n", filename);
     printf("       [--version][--help]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf(
         "Send BACnet Initialize-Routing-Table message to a network\n"
@@ -286,7 +286,7 @@ int main(int argc, char *argv[])
     time_t current_seconds = 0;
     time_t timeout_seconds = 0;
     int argi = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     filename = filename_remove_path(argv[0]);
     for (argi = 1; argi < argc; argi++) {

apps/mstpcap/main.c

@@ -121,7 +121,8 @@ struct mstp_statistics {
 static struct mstp_statistics MSTP_Statistics[MAX_MSTP_DEVICES];
 static uint32_t Invalid_Frame_Count;
 
-static uint32_t timeval_diff_ms(struct timeval *old, struct timeval *now)
+static uint32_t timeval_diff_ms(
+    const struct timeval *old, const struct timeval *now)
 {
     uint32_t ms = 0;
 
@@ -132,17 +133,18 @@ static uint32_t timeval_diff_ms(struct timeval *old, struct timeval *now)
     return ms;
 }
 
-static void mstp_monitor_i_am(uint8_t mac, uint8_t *pdu, uint16_t pdu_len)
+static void mstp_monitor_i_am(
+    uint8_t mac, const uint8_t *pdu, uint16_t pdu_len)
 {
     BACNET_ADDRESS src = { 0 };
     BACNET_ADDRESS dest = { 0 };
     BACNET_NPDU_DATA npdu_data = { 0 };
     int apdu_offset = 0;
     uint16_t apdu_len = 0;
-    uint8_t *apdu = NULL;
+    const uint8_t *apdu = NULL;
     uint8_t pdu_type = 0;
     uint8_t service_choice = 0;
-    uint8_t *service_request = NULL;
+    const uint8_t *service_request = NULL;
     uint32_t device_id = 0;
     int len = 0;
 
@@ -171,7 +173,8 @@ static void mstp_monitor_i_am(uint8_t mac, uint8_t *pdu, uint16_t pdu_len)
 }
 
 static void packet_statistics(
-    struct timeval *tv, struct mstp_port_struct_t *mstp_port)
+    const struct timeval *tv,
+    const struct mstp_port_struct_t *mstp_port)
 {
     static struct timeval old_tv = { 0 };
     static uint8_t old_frame = 255;
@@ -423,7 +426,7 @@ uint16_t MSTP_Get_Send(
  */
 void MSTP_Send_Frame(
     struct mstp_port_struct_t *mstp_port,
-    uint8_t * buffer,
+    const uint8_t * buffer,
     uint16_t nbytes)
 {
     (void)mstp_port;
@@ -443,7 +446,7 @@ static char Capture_Filename[64] = "mstp_20090123091200.cap";
 static FILE *File_Handle = NULL; /* stream pointer */
 #if defined(_WIN32)
 static HANDLE Pipe_Handle = INVALID_HANDLE_VALUE; /* pipe handle */
-static void named_pipe_create(char *pipe_name)
+static void named_pipe_create(const char *pipe_name)
 {
     if (!Wireshark_Capture) {
         fprintf(stdout, "mstpcap: Creating Named Pipe \"%s\"\n", pipe_name);
@@ -510,7 +513,7 @@ static size_t data_write_header(
 }
 #else
 static int FD_Pipe = -1;
-static void named_pipe_create(char *name)
+static void named_pipe_create(const char *name)
 {
     int rv = 0;
     rv = mkfifo(name, 0666);
@@ -915,7 +918,7 @@ static void signal_init(void)
 }
 #endif
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s", filename);
     printf(" [--scan <filename>]\n");
@@ -925,7 +928,7 @@ static void print_usage(char *filename)
     printf(" [--version][--help]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("%s --scan <filename>\n"
            "perform statistic analysis on MS/TP capture file.\n",
@@ -986,7 +989,7 @@ int main(int argc, char *argv[])
     uint32_t packet_count = 0;
     uint32_t header_len = 0;
     int argi = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     MSTP_Port.InputBuffer = &RxBuffer[0];
     MSTP_Port.InputBufferSize = sizeof(RxBuffer);

apps/piface/device.c

@@ -444,7 +444,7 @@ bool Device_Object_Name(
     return status;
 }
 
-bool Device_Set_Object_Name(BACNET_CHARACTER_STRING *object_name)
+bool Device_Set_Object_Name(const BACNET_CHARACTER_STRING *object_name)
 {
     bool status = false; /*return value */
 
@@ -785,7 +785,7 @@ int Device_Object_List_Element_Encode(
  * Object.
  * @return True on success or else False if not found.
  */
-bool Device_Valid_Object_Name(BACNET_CHARACTER_STRING *object_name1,
+bool Device_Valid_Object_Name(const BACNET_CHARACTER_STRING *object_name1,
     BACNET_OBJECT_TYPE *object_type,
     uint32_t *object_instance)
 {
@@ -1180,7 +1180,7 @@ int Device_Read_Property_Local(BACNET_READ_PROPERTY_DATA *rpdata)
  * @return The length of the APDU on success, else BACNET_STATUS_ERROR
  */
 static int Read_Property_Common(
-    struct object_functions *pObject, BACNET_READ_PROPERTY_DATA *rpdata)
+    const struct object_functions *pObject, BACNET_READ_PROPERTY_DATA *rpdata)
 {
     int apdu_len = BACNET_STATUS_ERROR;
     BACNET_CHARACTER_STRING char_string;

apps/readfile/main.c

@@ -205,13 +205,13 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s device-instance file-instance local-name\n", filename);
     printf("       [--version][--help]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf(
         "Read a file from a BACnet device and save it locally.\n");
@@ -251,7 +251,7 @@ int main(int argc, char *argv[])
     bool found = false;
     uint16_t my_max_apdu = 0;
     int argi = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     /* print help if requested */
     filename = filename_remove_path(argv[0]);

apps/readprop/main.c

@@ -147,7 +147,7 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s device-instance object-type object-instance "
            "property [index]\n",
@@ -156,7 +156,7 @@ static void print_usage(char *filename)
     printf("       [--version][--help]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Read a property from an object in a BACnet device\n"
            "and print the value.\n");
@@ -255,7 +255,7 @@ int main(int argc, char *argv[])
     unsigned object_type = 0;
     unsigned object_property = 0;
     unsigned int target_args = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     filename = filename_remove_path(argv[0]);
     for (argi = 1; argi < argc; argi++) {

apps/readpropm/main.c

@@ -199,7 +199,7 @@ static void cleanup(void)
 }
 
 static void target_address_add(
-    long dnet, BACNET_MAC_ADDRESS *mac, BACNET_MAC_ADDRESS *adr)
+    long dnet, const BACNET_MAC_ADDRESS *mac, const BACNET_MAC_ADDRESS *adr)
 {
     BACNET_ADDRESS dest = { 0 };
 
@@ -234,7 +234,7 @@ static void target_address_add(
     address_add(Target_Device_Object_Instance, MAX_APDU, &dest);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s device-instance object-type object-instance "
            "property[index][,property[index]] [object-type ...]\n",
@@ -243,7 +243,7 @@ static void print_usage(char *filename)
     printf("       [--version][--help]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Read one or more properties from one or more objects\n"
            "in a BACnet device and print the value(s).\n");
@@ -350,7 +350,7 @@ int main(int argc, char *argv[])
     bool specific_address = false;
     unsigned int target_args = 0;
     bool status = false;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     filename = filename_remove_path(argv[0]);
     for (argi = 1; argi < argc; argi++) {

apps/readrange/main.c

@@ -121,7 +121,7 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s device-instance object-type object-instance property\n",
         filename);
@@ -129,7 +129,7 @@ static void print_usage(char *filename)
     printf("       [--version][--help]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Read a range of properties from an array or list property\n"
         "in an object in a BACnet device and print the values.\n");
@@ -199,7 +199,7 @@ int main(int argc, char *argv[])
     int year, month, day, wday;
     unsigned object_type = 0;
     unsigned object_property = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     filename = filename_remove_path(argv[0]);
     for (argi = 1; argi < argc; argi++) {

apps/remove-list-element/main.c

@@ -137,7 +137,7 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s device-instance object-type object-instance "
            "property array-index tag value\n",
@@ -146,7 +146,7 @@ static void print_usage(char *filename)
     printf("       [--version][--help][--verbose]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Remove an element from a BACnetLIST property of an object\n"
            "in a BACnet device.\n");
@@ -244,7 +244,7 @@ int main(int argc, char *argv[])
     bool specific_address = false;
     unsigned int target_args = 0;
     int argi = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     filename = filename_remove_path(argv[0]);
     for (argi = 1; argi < argc; argi++) {

apps/router-ipv6/main.c

@@ -156,7 +156,7 @@ static bool port_find(uint16_t snet, BACNET_ADDRESS *addr)
  * @param snet - router port SNET
  * @param addr - address of port at the net to be added
  */
-static void port_add(uint16_t snet, BACNET_ADDRESS *addr)
+static void port_add(uint16_t snet, const BACNET_ADDRESS *addr)
 {
     DNET *port = NULL;
     DNET *dnet = NULL;
@@ -204,7 +204,7 @@ static void port_add(uint16_t snet, BACNET_ADDRESS *addr)
  * @param net - net to be added
  * @param addr - address of router at the net to be added
  */
-static void dnet_add(uint16_t snet, uint16_t net, BACNET_ADDRESS *addr)
+static void dnet_add(uint16_t snet, uint16_t net, const BACNET_ADDRESS *addr)
 {
     DNET *dnet = NULL;
     DNET *port = NULL;
@@ -398,7 +398,8 @@ static void send_i_am_router_to_network(uint16_t snet, uint16_t net)
  *  Optionally may designate a particular router destination,
  *  especially when ACKing receipt of this message type.
  */
-static void send_initialize_routing_table_ack(uint8_t snet, BACNET_ADDRESS *dst)
+static void send_initialize_routing_table_ack(
+    uint8_t snet, const BACNET_ADDRESS *dst)
 {
     BACNET_ADDRESS dest;
     bool data_expecting_reply = false;
@@ -458,7 +459,10 @@ static void send_initialize_routing_table_ack(uint8_t snet, BACNET_ADDRESS *dst)
  * @param reject_reason [in] One of the BACNET_NETWORK_REJECT_REASONS codes.
  */
 static void send_reject_message_to_network(
-    uint16_t snet, BACNET_ADDRESS *dst, uint8_t reject_reason, uint16_t dnet)
+    uint16_t snet,
+    const BACNET_ADDRESS *dst,
+    uint8_t reject_reason,
+    uint16_t dnet)
 {
     BACNET_ADDRESS dest;
     bool data_expecting_reply = false;
@@ -571,9 +575,9 @@ static void send_who_is_router_to_network(uint16_t snet, uint16_t dnet)
  * @param npdu_len [in] The length of the remaining NPDU message in npdu[].
  */
 static void who_is_router_to_network_handler(uint16_t snet,
-    BACNET_ADDRESS *src,
-    BACNET_NPDU_DATA *npdu_data,
-    uint8_t *npdu,
+    const BACNET_ADDRESS *src,
+    const BACNET_NPDU_DATA *npdu_data,
+    const uint8_t *npdu,
     uint16_t npdu_len)
 {
     DNET *port = NULL;
@@ -752,7 +756,7 @@ static void network_control_handler(uint16_t snet,
  * @param src [in] The BACNET_ADDRESS of the message's original src.
  */
 static void routed_src_address(
-    BACNET_ADDRESS *router_src, uint16_t snet, BACNET_ADDRESS *src)
+    BACNET_ADDRESS *router_src, uint16_t snet, const BACNET_ADDRESS *src)
 {
     unsigned int i = 0;
 

apps/router-mstp/main.c

@@ -177,7 +177,7 @@ static bool port_find(uint16_t snet, BACNET_ADDRESS *addr)
  * @param snet - router port SNET
  * @param addr - address of port at the net to be added
  */
-static void port_add(uint16_t snet, BACNET_ADDRESS *addr)
+static void port_add(uint16_t snet, const BACNET_ADDRESS *addr)
 {
     DNET *port = NULL;
     DNET *dnet = NULL;
@@ -225,7 +225,7 @@ static void port_add(uint16_t snet, BACNET_ADDRESS *addr)
  * @param net - net to be added
  * @param addr - address of router at the net to be added
  */
-static void dnet_add(uint16_t snet, uint16_t net, BACNET_ADDRESS *addr)
+static void dnet_add(uint16_t snet, uint16_t net, const BACNET_ADDRESS *addr)
 {
     DNET *dnet = NULL;
     DNET *port = NULL;
@@ -419,7 +419,8 @@ static void send_i_am_router_to_network(uint16_t snet, uint16_t net)
  *  Optionally may designate a particular router destination,
  *  especially when ACKing receipt of this message type.
  */
-static void send_initialize_routing_table_ack(uint8_t snet, BACNET_ADDRESS *dst)
+static void send_initialize_routing_table_ack(
+    uint8_t snet, const BACNET_ADDRESS *dst)
 {
     BACNET_ADDRESS dest;
     bool data_expecting_reply = false;
@@ -479,7 +480,10 @@ static void send_initialize_routing_table_ack(uint8_t snet, BACNET_ADDRESS *dst)
  * @param reject_reason [in] One of the BACNET_NETWORK_REJECT_REASONS codes.
  */
 static void send_reject_message_to_network(
-    uint16_t snet, BACNET_ADDRESS *dst, uint8_t reject_reason, uint16_t dnet)
+    uint16_t snet,
+    const BACNET_ADDRESS *dst,
+    uint8_t reject_reason,
+    uint16_t dnet)
 {
     BACNET_ADDRESS dest;
     bool data_expecting_reply = false;
@@ -592,9 +596,9 @@ static void send_who_is_router_to_network(uint16_t snet, uint16_t dnet)
  * @param npdu_len [in] The length of the remaining NPDU message in npdu[].
  */
 static void who_is_router_to_network_handler(uint16_t snet,
-    BACNET_ADDRESS *src,
-    BACNET_NPDU_DATA *npdu_data,
-    uint8_t *npdu,
+    const BACNET_ADDRESS *src,
+    const BACNET_NPDU_DATA *npdu_data,
+    const uint8_t *npdu,
     uint16_t npdu_len)
 {
     DNET *port = NULL;
@@ -775,7 +779,7 @@ static void network_control_handler(uint16_t snet,
  * @param src [in] The BACNET_ADDRESS of the message's original src.
  */
 static void routed_src_address(
-    BACNET_ADDRESS *router_src, uint16_t snet, BACNET_ADDRESS *src)
+    BACNET_ADDRESS *router_src, uint16_t snet, const BACNET_ADDRESS *src)
 {
     unsigned int i = 0;
 

apps/router/ipmodule.c

@@ -199,7 +199,10 @@ bool dl_ip_init(ROUTER_PORT *port, IP_DATA *ip_data)
 }
 
 int dl_ip_send(
-    IP_DATA *data, BACNET_ADDRESS *dest, uint8_t *pdu, unsigned pdu_len)
+    IP_DATA *data,
+    const BACNET_ADDRESS *dest,
+    const uint8_t *pdu,
+    unsigned pdu_len)
 {
     struct sockaddr_in bip_dest = { 0 };
     int buff_len = 0;

apps/router/ipmodule.h

@@ -45,8 +45,8 @@ bool dl_ip_init(
 
 int dl_ip_send(
     IP_DATA * data,
-    BACNET_ADDRESS * dest,
-    uint8_t * pdu,
+    const BACNET_ADDRESS * dest,
+    const uint8_t * pdu,
     unsigned pdu_len);
 
 int dl_ip_recv(

apps/router/main.c

@@ -43,7 +43,7 @@ int port_count;
 
 void print_help(void);
 
-bool read_config(char *filepath);
+bool read_config(const char *filepath);
 
 bool parse_cmd(int argc, char *argv[]);
 
@@ -53,7 +53,7 @@ bool init_router(void);
 
 void cleanup(void);
 
-void print_msg(BACMSG *msg);
+void print_msg(const BACMSG *msg);
 
 uint16_t process_msg(BACMSG *msg, MSG_DATA *data, uint8_t **buff);
 
@@ -61,7 +61,7 @@ uint16_t get_next_free_dnet(void);
 
 int kbhit(void);
 
-inline bool is_network_msg(BACMSG *msg);
+inline bool is_network_msg(const BACMSG *msg);
 
 int main(int argc, char *argv[])
 {
@@ -201,7 +201,7 @@ void print_help(void)
         "-s, --stopbits <1|2>\n\tspecify MSTP port stopbits\n");
 }
 
-bool read_config(char *filepath)
+bool read_config(const char *filepath)
 {
     config_t cfg;
     config_setting_t *setting;
@@ -725,11 +725,11 @@ void cleanup(void)
     pthread_mutex_destroy(&msg_lock);
 }
 
-void print_msg(BACMSG *msg)
+void print_msg(const BACMSG *msg)
 {
     if (msg->type == DATA) {
         int i;
-        MSG_DATA *data = (MSG_DATA *)msg->data;
+        const MSG_DATA *data = (const MSG_DATA *)msg->data;
 
         if (data->pdu_len) {
             PRINT(DEBUG, "Message PDU: ");
@@ -821,10 +821,10 @@ int kbhit(void)
     return bytesWaiting;
 }
 
-bool is_network_msg(BACMSG *msg)
+bool is_network_msg(const BACMSG *msg)
 {
     uint8_t control_byte; /* NPDU control byte */
-    MSG_DATA *data = (MSG_DATA *)msg->data;
+    const MSG_DATA *data = (const MSG_DATA *)msg->data;
 
     control_byte = data->pdu[1];
 

apps/router/network_layer.c

@@ -14,7 +14,8 @@
 #include "network_layer.h"
 #include "bacnet/bacint.h"
 
-uint16_t process_network_message(BACMSG *msg, MSG_DATA *data, uint8_t **buff)
+uint16_t process_network_message(
+    const BACMSG *msg, MSG_DATA *data, uint8_t **buff)
 {
     BACNET_NPDU_DATA npdu_data;
     ROUTER_PORT *srcport;

apps/router/network_layer.h

@@ -25,7 +25,7 @@
 #include "portthread.h"
 
 uint16_t process_network_message(
-    BACMSG * msg,
+    const BACMSG * msg,
     MSG_DATA * data,
     uint8_t ** buff);
 

apps/scov/main.c

@@ -161,14 +161,14 @@ static void cleanup(void)
     }
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s device-id object-type object-instance "
             "process-id <[un]confirmed lifetime|cancel>\n",
         filename);
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Subscribe to a BACnet object for Change-of-Value notifications\n"
         "in a BACnet device and print the Change-of-Value notifications.\n");
@@ -226,7 +226,7 @@ int main(int argc, char *argv[])
     time_t timeout_seconds = 0;
     time_t delta_seconds = 0;
     bool found = false;
-    char *filename = NULL;
+    const char *filename = NULL;
     bool print_usage_terse = false;
     bool print_usage_verbose = false;
     BACNET_SUBSCRIBE_COV_DATA *cov_data = NULL;

apps/timesync/main.c

@@ -82,14 +82,14 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s [--dnet][--dadr][--mac]\n", filename);
     printf("       [--date][--time]\n");
     printf("       [--version][--help]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Send BACnet TimeSynchronization request.\n");
     printf("\n");
@@ -157,7 +157,7 @@ int main(int argc, char *argv[])
     BACNET_ADDRESS dest = { 0 };
     bool global_broadcast = true;
     int argi = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     /* decode any command line parameters */
     filename = filename_remove_path(argv[0]);

apps/ucov/main.c

@@ -47,7 +47,7 @@ static void Init_Service_Handlers(void)
         SERVICE_CONFIRMED_READ_PROPERTY, handler_read_property);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Sends a BACnet Unconfirmed Change-of-Value Notification\n"
         "to the network.\n");

apps/uevent/main.c

@@ -49,7 +49,7 @@ static void Init_Service_Handlers(void)
         SERVICE_CONFIRMED_READ_PROPERTY, handler_read_property);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s pid object-type object-instance \n"
            "    event-object-type event-object-instance \n"
@@ -63,7 +63,7 @@ static void print_usage(char *filename)
     printf("       [--version][--help]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Send BACnet UnconfirmedEventNotification message for a device.\n");
     printf("--mac A\n"
@@ -99,7 +99,7 @@ int main(int argc, char *argv[])
     bool specific_address = false;
     int argi = 0;
     unsigned int target_args = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     filename = filename_remove_path(argv[0]);
     for (argi = 1; argi < argc; argi++) {

apps/uptransfer/main.c

@@ -117,14 +117,14 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s <device-instance|broadcast|dnet=> vendor-id"
         " service-number tag value [tag value...]\n",
         filename);
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Send BACnet UnconfirmedPrivateTransfer message to the network.\n");
     printf("device-instance:\n"
@@ -181,7 +181,7 @@ int main(int argc, char *argv[])
     time_t timeout_seconds = 0;
     time_t delta_seconds = 0;
     bool found = false;
-    char *filename = NULL;
+    const char *filename = NULL;
     char *value_string = NULL;
     bool status = false;
     int args_remaining = 0, tag_value_arg = 0, i = 0;

apps/whohas/main.c

@@ -85,14 +85,14 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s [device-instance-min device-instance-min] "
            "<object-type object-instance | object-name> [--help]\r\n",
         filename);
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     print_usage(filename);
     printf("Send BACnet WhoHas request to devices, \r\n"

apps/whois/main.c

@@ -73,7 +73,7 @@ static struct address_entry *alloc_address_entry(void)
 }
 
 static void address_table_add(
-    uint32_t device_id, unsigned max_apdu, BACNET_ADDRESS *src)
+    uint32_t device_id, unsigned max_apdu, const BACNET_ADDRESS *src)
 {
     struct address_entry *pMatch;
     uint8_t flags = 0;
@@ -185,7 +185,7 @@ static void init_service_handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_macaddr(uint8_t *addr, int len)
+static void print_macaddr(const uint8_t *addr, int len)
 {
     int j = 0;
 
@@ -246,7 +246,7 @@ static void print_address_cache(void)
     }
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s", filename);
     printf(" [device-instance-min [device-instance-max]]\n");
@@ -254,7 +254,7 @@ static void print_usage(char *filename)
     printf("       [--version][--help]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Send BACnet WhoIs service request to a device or multiple\n"
         "devices, and wait for responses. Displays any devices found\n"
@@ -338,7 +338,7 @@ int main(int argc, char *argv[])
     bool global_broadcast = true;
     int argi = 0;
     unsigned int target_args = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
     bool repeat_forever = false;
     long retry_count = 0;
 

apps/writeprop/main.c

@@ -136,14 +136,14 @@ static void Init_Service_Handlers(void)
     apdu_set_reject_handler(MyRejectHandler);
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s device-instance object-type object-instance "
            "property priority index tag value [tag value...]\n",
         filename);
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf(
         "device-instance:\n"

apps/writepropm/main.c

@@ -162,7 +162,7 @@ static void cleanup(void)
     }
 }
 
-static void print_usage(char *filename)
+static void print_usage(const char *filename)
 {
     printf("Usage: %s device-instance object-type object-instance "
            "property[index] priority tag value [property[index] priority tag "
@@ -171,7 +171,7 @@ static void print_usage(char *filename)
     printf("       [--version][--help]\n");
 }
 
-static void print_help(char *filename)
+static void print_help(const char *filename)
 {
     printf("Write one or more properties to one or more objects\n"
         "in a BACnet device.\n");
@@ -278,7 +278,7 @@ int main(int argc, char *argv[])
     unsigned property_array_index = 0;
     int scan_count = 0;
     int argi = 0;
-    char *filename = NULL;
+    const char *filename = NULL;
 
     filename = filename_remove_path(argv[0]);
     for (argi = 1; argi < argc; argi++) {

ports/arduino_uno/bip-init.c

@@ -50,7 +50,7 @@ long bip_getaddrbyname(const char *host_name)
  * @param ifname [in] The named interface to use for the network layer.
  *        Eg, for Linux, ifname is eth0, ath0, arc0, and others.
  */
-void bip_set_interface(char *ifname)
+void bip_set_interface(const char *ifname)
 {
     uint8_t local_address[] = { 0, 0, 0, 0 };
     uint8_t broadcast_address[] = { 0, 0, 0, 0 };

ports/arduino_uno/bip.c

@@ -34,7 +34,7 @@ static uint8_t BIP_Broadcast_Address[4] = { 0, 0, 0, 0 };
 /** Converter from uint8_t[4] type address to uint32_t
  *
  */
-uint32_t convertBIP_Address2uint32(uint8_t *bip_address)
+uint32_t convertBIP_Address2uint32(const suint8_t *bip_address)
 {
     return (uint32_t)((bip_address[0] * 2 ^ 24) + (bip_address[1] * 2 ^ 16) +
         (bip_address[2] * 2 ^ 8) + bip_address[3]);
@@ -74,7 +74,7 @@ bool bip_valid(void)
     return (BIP_Socket < MAX_SOCK_NUM);
 }
 
-void bip_set_addr(uint8_t *net_address)
+void bip_set_addr(const uint8_t *net_address)
 { /* in network byte order */
     for (uint8_t i = 0; i < 4; i++)
         BIP_Address[i] = net_address[i];
@@ -86,7 +86,7 @@ uint8_t *bip_get_addr(void)
     return BIP_Address;
 }
 
-void bip_set_broadcast_addr(uint8_t *net_address)
+void bip_set_broadcast_addr(const uint8_t *net_address)
 { /* in network byte order */
     for (uint8_t i = 0; i < 4; i++)
         BIP_Broadcast_Address[i] = net_address[i];
@@ -109,9 +109,8 @@ uint16_t bip_get_port(void)
     return ntohs(BIP_Port);
 }
 
-static int bip_decode_bip_address(BACNET_ADDRESS *bac_addr,
+static int bip_decode_bip_address(const BACNET_ADDRESS *bac_addr,
     uint8_t *address, /* in network format */
-
     uint16_t *port)
 { /* in network format */
     int len = 0;

ports/arduino_uno/bip.h

@@ -28,11 +28,11 @@ extern "C" {
     /* on Linux, ifname is eth0, ath0, arc0, and others.
        on Windows, ifname is the dotted ip address of the interface */
     bool bip_init(char *ifname);
-    void bip_set_interface(char *ifname);
+    void bip_set_interface(const char *ifname);
     void bip_cleanup(void);
 
     /* Convert uint8_t IPv4 to uint32 */
-    uint32_t convertBIP_Address2uint32(uint8_t * bip_address);
+    uint32_t convertBIP_Address2uint32(const uint8_t * bip_address);
     void convertUint32Address_2_uint8Address(uint32_t ip,
         uint8_t * address);
     /* common BACnet/IP functions */
@@ -68,12 +68,12 @@ extern "C" {
     uint16_t bip_get_port(void);
 
     /* use network byte order for setting */
-    void bip_set_addr(uint8_t * net_address);
+    void bip_set_addr(const uint8_t * net_address);
     /* returns network byte order */
     uint8_t *bip_get_addr(void);
 
     /* use network byte order for setting */
-    void bip_set_broadcast_addr(uint8_t * net_address);
+    void bip_set_broadcast_addr(const uint8_t * net_address);
     /* returns network byte order */
     uint8_t *bip_get_broadcast_addr(void);
 

ports/arduino_uno/bvlc-arduino.c

@@ -54,12 +54,9 @@ static int bvlc_encode_bvlc_result(uint8_t *pdu, BACNET_BVLC_RESULT result_code)
  * @return Upon successful completion, returns the number of bytes sent.
  *  Otherwise, -1 shall be returned and errno set to indicate the error.
  */
-static int bvlc_send_mpdu(uint8_t *dest_addr, /* the destination address */
-
-    uint16_t *dest_port, /* the destination port */
-
+static int bvlc_send_mpdu(const uint8_t *dest_addr, /* the destination address */
+    const uint16_t *dest_port, /* the destination port */
     uint8_t *mtu, /* the data */
-
     uint16_t mtu_len)
 { /* amount of data to send  */
     /* assumes that the driver has already been initialized */
@@ -75,9 +72,8 @@ static int bvlc_send_mpdu(uint8_t *dest_addr, /* the destination address */
  * @param dest_addr - destination address
  * @param dest_port - destination port
  */
-static void bvlc_send_result(uint8_t *dest_addr,
-    uint16_t *dest_port, /* the destination address */
-
+static void bvlc_send_result(const uint8_t *dest_addr,
+    const uint16_t *dest_port, /* the destination address */
     BACNET_BVLC_RESULT result_code)
 {
     uint8_t mtu[BIP_MPDU_MAX] = { 0 };

ports/arduino_uno/h_whois.c

@@ -64,7 +64,7 @@ void handler_who_is(
     } else if (len != -1) {
         /* is my device id within the limits? */
         target_device = Device_Object_Instance_Number();
-        if (((target_device >= low_limit) && (target_device <= high_limit)) {
+        if ((target_device >= low_limit) && (target_device <= high_limit)) {
             sendIamUnicast(&Handler_Transmit_Buffer[0], src);
         }
     }

ports/at91sam7s/device.c

@@ -126,7 +126,8 @@ static struct my_object_functions *Device_Objects_Find_Functions(
 }
 
 static int Read_Property_Common(
-    struct my_object_functions *pObject, BACNET_READ_PROPERTY_DATA *rpdata)
+    const struct my_object_functions *pObject,
+    BACNET_READ_PROPERTY_DATA *rpdata)
 {
     int apdu_len = BACNET_STATUS_ERROR;
     BACNET_CHARACTER_STRING char_string;
@@ -299,7 +300,7 @@ bool Device_Object_Name(
     return status;
 }
 
-bool Device_Set_Object_Name(BACNET_CHARACTER_STRING *object_name)
+bool Device_Set_Object_Name(const BACNET_CHARACTER_STRING *object_name)
 {
     bool status = false; /*return value */
 
@@ -574,7 +575,7 @@ int Device_Object_List_Element_Encode(
     return apdu_len;
 }
 
-bool Device_Valid_Object_Name(BACNET_CHARACTER_STRING *object_name1,
+bool Device_Valid_Object_Name(const BACNET_CHARACTER_STRING *object_name1,
     BACNET_OBJECT_TYPE *object_type,
     uint32_t *object_instance)
 {

ports/at91sam7s/dlmstp.c

@@ -195,10 +195,10 @@ void dlmstp_fill_bacnet_address(BACNET_ADDRESS *src, uint8_t mstp_address)
     }
 }
 
-static bool dlmstp_compare_data_expecting_reply(uint8_t *request_pdu,
+static bool dlmstp_compare_data_expecting_reply(const uint8_t *request_pdu,
     uint16_t request_pdu_len,
     uint8_t src_address,
-    uint8_t *reply_pdu,
+    const uint8_t *reply_pdu,
     uint16_t reply_pdu_len,
     uint8_t dest_address)
 {
@@ -314,7 +314,7 @@ static void MSTP_Send_Frame(
     uint8_t frame_type, /* type of frame to send - see defines */
     uint8_t destination, /* destination address */
     uint8_t source, /* source address */
-    uint8_t *data, /* any data to be sent - may be null */
+    const uint8_t *data, /* any data to be sent - may be null */
     uint16_t data_len)
 { /* number of bytes of data (up to 501) */
     uint8_t crc8 = 0xFF; /* used to calculate the crc value */
@@ -735,7 +735,7 @@ static bool MSTP_Master_Node_FSM(void)
                     frame_type = FRAME_TYPE_BACNET_DATA_NOT_EXPECTING_REPLY;
                 }
                 MSTP_Send_Frame(frame_type, pkt->destination_mac, This_Station,
-                    (uint8_t *)&pkt->buffer[0], pkt->length);
+                    &pkt->buffer[0], pkt->length);
                 FrameCount++;
                 switch (frame_type) {
                     case FRAME_TYPE_BACNET_DATA_EXPECTING_REPLY:
@@ -1081,7 +1081,7 @@ static bool MSTP_Master_Node_FSM(void)
                     frame_type = FRAME_TYPE_BACNET_DATA_NOT_EXPECTING_REPLY;
                 }
                 MSTP_Send_Frame(frame_type, pkt->destination_mac, This_Station,
-                    (uint8_t *)&pkt->buffer[0], pkt->length);
+                    &pkt->buffer[0], pkt->length);
                 Master_State = MSTP_MASTER_STATE_IDLE;
                 /* clear our flag we were holding for comparison */
                 MSTP_Flag.ReceivedValidFrame = false;
@@ -1165,7 +1165,7 @@ static void MSTP_Slave_Node_FSM(void)
                     frame_type = FRAME_TYPE_BACNET_DATA_NOT_EXPECTING_REPLY;
                 }
                 MSTP_Send_Frame(frame_type, pkt->destination_mac, This_Station,
-                    (uint8_t *)&pkt->buffer[0], pkt->length);
+                    &pkt->buffer[0], pkt->length);
                 (void)Ringbuf_Pop(&PDU_Queue, NULL);
             }
             /* clear our flag we were holding for comparison */

ports/at91sam7s/netport.c

@@ -294,7 +294,7 @@ bool Network_Port_MAC_Address(
  * @return  true if object-name was set
  */
 bool Network_Port_MAC_Address_Set(
-    uint32_t object_instance, uint8_t *mac_src, uint8_t mac_len)
+    uint32_t object_instance, const uint8_t *mac_src, uint8_t mac_len)
 {
     if (mac_len == 1) {
         Object_List[0].MAC_Address[0] = mac_src[0];

ports/at91sam7s/rs485.c

@@ -171,7 +171,7 @@ void RS485_Transmitter_Enable(bool enable)
  * ALGORITHM:   none
  * NOTES:       none
  *****************************************************************************/
-void RS485_Send_Data(uint8_t *buffer, /* data to send */
+void RS485_Send_Data(const uint8_t *buffer, /* data to send */
     uint16_t nbytes)
 { /* number of bytes of data */
     /* LED on send */

ports/at91sam7s/rs485.h

@@ -22,7 +22,7 @@ extern "C" {
         bool enable);
 
     void RS485_Send_Data(
-        uint8_t * buffer,       /* data to send */
+        const uint8_t * buffer, /* data to send */
         uint16_t nbytes);       /* number of bytes of data */
 
     bool RS485_ReceiveError(

ports/atmega168/ai.h

@@ -37,13 +37,13 @@ extern "C" {
         uint32_t object_instance);
     bool Analog_Input_Name_Set(
         uint32_t object_instance,
-        char *new_name);
+        const char *new_name);
 
-    char *Analog_Input_Description(
+    const char *Analog_Input_Description(
         uint32_t instance);
     bool Analog_Input_Description_Set(
         uint32_t instance,
-        char *new_name);
+        const char *new_name);
 
     bool Analog_Input_Units_Set(
         uint32_t instance,

ports/atmega168/dlmstp.c

@@ -226,7 +226,7 @@ static void MSTP_Send_Frame(
     uint8_t frame_type, /* type of frame to send - see defines */
     uint8_t destination, /* destination address */
     uint8_t source, /* source address */
-    uint8_t *pdu, /* any data to be sent - may be null */
+    const uint8_t *pdu, /* any data to be sent - may be null */
     uint16_t pdu_len)
 { /* number of bytes of data (up to 501) */
     uint8_t crc8 = 0xFF; /* used to calculate the crc value */
@@ -635,7 +635,7 @@ static bool MSTP_Master_Node_FSM(void)
             if (TransmitPacketLen) {
                 MSTP_Send_Frame(FRAME_TYPE_BACNET_DATA_NOT_EXPECTING_REPLY,
                     MSTP_BROADCAST_ADDRESS, This_Station,
-                    (uint8_t *)&TransmitPacket[0], TransmitPacketLen);
+                    &TransmitPacket[0], TransmitPacketLen);
                 FrameCount++;
             } else {
                 /* NothingToSend */
@@ -959,7 +959,7 @@ static bool MSTP_Master_Node_FSM(void)
                 /* Note: optimized such that we are never a client */
                 MSTP_Send_Frame(FRAME_TYPE_BACNET_DATA_NOT_EXPECTING_REPLY,
                     TransmitPacketDest, This_Station,
-                    (uint8_t *)&TransmitPacket[0], TransmitPacketLen);
+                    &TransmitPacket[0], TransmitPacketLen);
                 MSTP_Flag.TransmitPacketPending = false;
                 Master_State = MSTP_MASTER_STATE_IDLE;
             } else {

ports/atmega168/rs485.c

@@ -144,7 +144,7 @@ void RS485_Turnaround_Delay(void)
  * @param buffer - data to send
  * @param nbytes - number of bytes of data
  */
-void RS485_Send_Data(uint8_t *buffer,
+void RS485_Send_Data(const uint8_t *buffer,
     uint16_t nbytes)
 {
     while (nbytes) {

ports/atmega168/rs485.h

@@ -21,7 +21,7 @@ extern "C" {
         bool enable);
 
     void RS485_Send_Data(
-        uint8_t * buffer,       /* data to send */
+        const uint8_t * buffer, /* data to send */
         uint16_t nbytes);       /* number of bytes of data */
 
     bool RS485_ReceiveError(

ports/bdk-atxx4-mstp/bname.c

@@ -18,7 +18,7 @@
 #include "bacnet/basic/object/device.h"
 #include "bname.h"
 
-static bool bacnet_name_isvalid(uint8_t encoding, uint8_t length, char *str)
+static bool bacnet_name_isvalid(uint8_t encoding, uint8_t length, const char *str)
 {
     bool valid = false;
 
@@ -35,7 +35,7 @@ static bool bacnet_name_isvalid(uint8_t encoding, uint8_t length, char *str)
 }
 
 bool bacnet_name_save(
-    uint16_t offset, uint8_t encoding, char *str, uint8_t length)
+    uint16_t offset, uint8_t encoding, const char *str, uint8_t length)
 {
     uint8_t buffer[NV_EEPROM_NAME_SIZE] = { 0 };
     uint8_t i = 0;
@@ -55,11 +55,11 @@ bool bacnet_name_save(
     return false;
 }
 
-bool bacnet_name_set(uint16_t offset, BACNET_CHARACTER_STRING *char_string)
+bool bacnet_name_set(uint16_t offset, const BACNET_CHARACTER_STRING *char_string)
 {
     uint8_t encoding = 0;
     uint8_t length = 0;
-    char *str = NULL;
+    const char *str = NULL;
 
     length = characterstring_length(char_string);
     encoding = characterstring_encoding(char_string);
@@ -70,7 +70,7 @@ bool bacnet_name_set(uint16_t offset, BACNET_CHARACTER_STRING *char_string)
 bool bacnet_name_write_unique(uint16_t offset,
     BACNET_OBJECT_TYPE object_type,
     uint32_t object_instance,
-    BACNET_CHARACTER_STRING *char_string,
+    const BACNET_CHARACTER_STRING *char_string,
     BACNET_ERROR_CLASS *error_class,
     BACNET_ERROR_CODE *error_code)
 {
@@ -120,7 +120,7 @@ bool bacnet_name_write_unique(uint16_t offset,
 
 /* no required minumum length or duplicate checking */
 bool bacnet_name_write(uint16_t offset,
-    BACNET_CHARACTER_STRING *char_string,
+    const BACNET_CHARACTER_STRING *char_string,
     BACNET_ERROR_CLASS *error_class,
     BACNET_ERROR_CODE *error_code)
 {
@@ -149,14 +149,16 @@ bool bacnet_name_write(uint16_t offset,
     return status;
 }
 
-void bacnet_name_init(uint16_t offset, char *default_string)
+void bacnet_name_init(uint16_t offset, const char *default_string)
 {
     (void)bacnet_name_save(
         offset, CHARACTER_UTF8, default_string, strlen(default_string));
 }
 
 void bacnet_name(
-    uint16_t offset, BACNET_CHARACTER_STRING *char_string, char *default_string)
+    uint16_t offset,
+    BACNET_CHARACTER_STRING *char_string,
+    const char *default_string)
 {
     uint8_t encoding = 0;
     uint8_t length = 0;

ports/bdk-atxx4-mstp/bname.h

@@ -17,30 +17,30 @@ extern "C" {
 
     bool bacnet_name_set(
         uint16_t eeprom_offset,
-        BACNET_CHARACTER_STRING * char_string);
+        const BACNET_CHARACTER_STRING * char_string);
     void bacnet_name_init(
         uint16_t eeprom_offset,
-        char *default_string);
+        const char *default_string);
     bool bacnet_name_save(
         uint16_t offset,
         uint8_t encoding,
-        char *str,
+        const char *str,
         uint8_t length);
     void bacnet_name(
         uint16_t eeprom_offset,
         BACNET_CHARACTER_STRING * char_string,
-        char *default_string);
+        const char *default_string);
     bool bacnet_name_write_unique(
         uint16_t offset,
         BACNET_OBJECT_TYPE object_type,
         uint32_t object_instance,
-        BACNET_CHARACTER_STRING * char_string,
+        const BACNET_CHARACTER_STRING * char_string,
         BACNET_ERROR_CLASS * error_class,
         BACNET_ERROR_CODE * error_code);
     /* no required minumum length or duplicate checking */
     bool bacnet_name_write(
         uint16_t offset,
-        BACNET_CHARACTER_STRING * char_string,
+        const BACNET_CHARACTER_STRING * char_string,
         BACNET_ERROR_CLASS * error_class,
         BACNET_ERROR_CODE * error_code);
 

ports/bdk-atxx4-mstp/device.c

@@ -551,7 +551,7 @@ int Device_Object_List_Element_Encode(
     return apdu_len;
 }
 
-bool Device_Valid_Object_Name(BACNET_CHARACTER_STRING *object_name1,
+bool Device_Valid_Object_Name(const BACNET_CHARACTER_STRING *object_name1,
     BACNET_OBJECT_TYPE *object_type,
     uint32_t *object_instance)
 {

ports/bdk-atxx4-mstp/dlmstp.c

@@ -196,10 +196,10 @@ void dlmstp_fill_bacnet_address(BACNET_ADDRESS *src, uint8_t mstp_address)
     }
 }
 
-static bool dlmstp_compare_data_expecting_reply(uint8_t *request_pdu,
+static bool dlmstp_compare_data_expecting_reply(const uint8_t *request_pdu,
     uint16_t request_pdu_len,
     uint8_t src_address,
-    uint8_t *reply_pdu,
+    const uint8_t *reply_pdu,
     uint16_t reply_pdu_len,
     uint8_t dest_address)
 {
@@ -315,7 +315,7 @@ static void MSTP_Send_Frame(
     uint8_t frame_type, /* type of frame to send - see defines */
     uint8_t destination, /* destination address */
     uint8_t source,      /* source address */
-    uint8_t *data, /* any data to be sent - may be null */
+    const uint8_t *data, /* any data to be sent - may be null */
     uint16_t data_len)
 { /* number of bytes of data (up to 501) */
     uint8_t crc8 = 0xFF; /* used to calculate the crc value */
@@ -757,7 +757,7 @@ static bool MSTP_Master_Node_FSM(void)
                     frame_type = FRAME_TYPE_BACNET_DATA_NOT_EXPECTING_REPLY;
                 }
                 MSTP_Send_Frame(frame_type, pkt->destination_mac, This_Station,
-                    (uint8_t *)&pkt->buffer[0], pkt->length);
+                    &pkt->buffer[0], pkt->length);
                 FrameCount++;
                 switch (frame_type) {
                     case FRAME_TYPE_BACNET_DATA_EXPECTING_REPLY:
@@ -1111,7 +1111,7 @@ static bool MSTP_Master_Node_FSM(void)
                     frame_type = FRAME_TYPE_BACNET_DATA_NOT_EXPECTING_REPLY;
                 }
                 MSTP_Send_Frame(frame_type, pkt->destination_mac, This_Station,
-                    (uint8_t *)&pkt->buffer[0], pkt->length);
+                    &pkt->buffer[0], pkt->length);
                 Master_State = MSTP_MASTER_STATE_IDLE;
                 /* clear our flag we were holding for comparison */
                 MSTP_Flag.ReceivedValidFrame = false;
@@ -1195,7 +1195,7 @@ static void MSTP_Slave_Node_FSM(void)
                     frame_type = FRAME_TYPE_BACNET_DATA_NOT_EXPECTING_REPLY;
                 }
                 MSTP_Send_Frame(frame_type, pkt->destination_mac, This_Station,
-                    (uint8_t *)&pkt->buffer[0], pkt->length);
+                    &pkt->buffer[0], pkt->length);
                 (void)Ringbuf_Pop(&PDU_Queue, NULL);
             }
             /* clear our flag we were holding for comparison */

ports/bdk-atxx4-mstp/eeprom.c

@@ -30,7 +30,7 @@ int eeprom_bytes_read(
 }
 
 int eeprom_bytes_write(uint16_t eeaddr, /* EEPROM starting memory address */
-    uint8_t *buf, /* data to send */
+    const uint8_t *buf, /* data to send */
     int len)
 { /* number of bytes of data */
     int count = 0;

ports/bdk-atxx4-mstp/eeprom.h

@@ -21,7 +21,7 @@ extern "C" {
         int nbytes);    /* number of bytes of data to read */
     int eeprom_bytes_write(
         uint16_t ee_address,    /* EEPROM starting memory address */
-        uint8_t * buffer,       /* data to send */
+        const uint8_t * buffer, /* data to send */
         int nbytes);    /* number of bytes of data */
 
 #ifdef __cplusplus

ports/bdk-atxx4-mstp/netport.c

@@ -295,7 +295,7 @@ bool Network_Port_MAC_Address(
  * @return  true if object-name was set
  */
 bool Network_Port_MAC_Address_Set(
-    uint32_t object_instance, uint8_t *mac_src, uint8_t mac_len)
+    uint32_t object_instance, const uint8_t *mac_src, uint8_t mac_len)
 {
     if (mac_len == 1) {
         Object_List[0].MAC_Address[0] = mac_src[0];

ports/bdk-atxx4-mstp/rs485.c

@@ -175,7 +175,7 @@ bool rs485_receive_error(void)
  * RETURN:      none
  * NOTES:       none
  *****************************************************************************/
-void rs485_bytes_send(uint8_t *buffer, /* data to send */
+void rs485_bytes_send(const uint8_t *buffer, /* data to send */
     uint16_t nbytes)
 { /* number of bytes of data */
     led_on(LED_5);

ports/bdk-atxx4-mstp/rs485.h

@@ -23,7 +23,7 @@ extern "C" {
     bool rs485_receive_error(
         void);
     void rs485_bytes_send(
-        uint8_t * buffer,       /* data to send */
+        const uint8_t * buffer,       /* data to send */
         uint16_t nbytes);       /* number of bytes of data */
     uint32_t rs485_baud_rate(
         void);

ports/bsd/bip-init.c

@@ -162,7 +162,7 @@ void bip_get_broadcast_address(BACNET_ADDRESS *dest)
  *
  * @param addr - network IPv4 address
  */
-bool bip_set_addr(BACNET_IP_ADDRESS *addr)
+bool bip_set_addr(const BACNET_IP_ADDRESS *addr)
 {
     (void)addr;
     /* not something we do within this driver */
@@ -189,7 +189,7 @@ bool bip_get_addr(BACNET_IP_ADDRESS *addr)
  * @param addr - network IPv4 address
  * @return true if the address was set
  */
-bool bip_set_broadcast_addr(BACNET_IP_ADDRESS *addr)
+bool bip_set_broadcast_addr(const BACNET_IP_ADDRESS *addr)
 {
     (void)addr;
     /* not something we do within this driver */
@@ -257,7 +257,8 @@ uint8_t bip_get_subnet_prefix(void)
  * @return Upon successful completion, returns the number of bytes sent.
  *  Otherwise, -1 shall be returned and errno set to indicate the error.
  */
-int bip_send_mpdu(BACNET_IP_ADDRESS *dest, uint8_t *mtu, uint16_t mtu_len)
+int bip_send_mpdu(
+    const BACNET_IP_ADDRESS *dest, const uint8_t *mtu, uint16_t mtu_len)
 {
     struct sockaddr_in bip_dest = { 0 };
 
@@ -276,7 +277,7 @@ int bip_send_mpdu(BACNET_IP_ADDRESS *dest, uint8_t *mtu, uint16_t mtu_len)
     /* Send the packet */
     debug_print_ipv4(
         "Sending MPDU->", &bip_dest.sin_addr, bip_dest.sin_port, mtu_len);
-    return sendto(BIP_Socket, (char *)mtu, mtu_len, 0,
+    return sendto(BIP_Socket, (const char *)mtu, mtu_len, 0,
         (struct sockaddr *)&bip_dest, sizeof(struct sockaddr));
 }
 
@@ -472,7 +473,8 @@ static char *ifname_default(void)
  * @param addr [out] The netmask addr, broadcast addr, ip addr.
  * @param request [in] addr broadaddr netmask
  */
-static int get_local_address(char *ifname, struct in_addr *addr, char *request)
+static int get_local_address(
+    const char *ifname, struct in_addr *addr, const char *request)
 {
     char rv = '\0'; /* return value */
 
@@ -543,7 +545,7 @@ int bip_set_broadcast_binding(
  * @param ifname [in] The named interface to use for the network layer.
  *        Eg, for MAC OS X, ifname is en0, en1, and others.
  */
-void bip_set_interface(char *ifname)
+void bip_set_interface(const char *ifname)
 {
     struct in_addr local_address;
     struct in_addr broadcast_address;
@@ -602,7 +604,7 @@ void bip_set_interface(char *ifname)
     }
 }
 
-static int createSocket(struct sockaddr_in *sin)
+static int createSocket(const struct sockaddr_in *sin)
 {
     int status = 0; /* return from socket lib calls */
     int sockopt = 0;

ports/bsd/bip6.c

@@ -181,7 +181,7 @@ void bip6_get_my_address(BACNET_ADDRESS *addr)
  *
  * @param addr - network IPv6 address
  */
-bool bip6_set_addr(BACNET_IP6_ADDRESS *addr)
+bool bip6_set_addr(const BACNET_IP6_ADDRESS *addr)
 {
     return bvlc6_address_copy(&BIP6_Addr, addr);
 }
@@ -201,7 +201,7 @@ bool bip6_get_addr(BACNET_IP6_ADDRESS *addr)
  *
  * @param addr - network IPv6 address
  */
-bool bip6_set_broadcast_addr(BACNET_IP6_ADDRESS *addr)
+bool bip6_set_broadcast_addr(const BACNET_IP6_ADDRESS *addr)
 {
     return bvlc6_address_copy(&BIP6_Broadcast_Addr, addr);
 }
@@ -227,7 +227,8 @@ bool bip6_get_broadcast_addr(BACNET_IP6_ADDRESS *addr)
  * @return Upon successful completion, returns the number of bytes sent.
  *  Otherwise, -1 shall be returned and errno set to indicate the error.
  */
-int bip6_send_mpdu(BACNET_IP6_ADDRESS *dest, uint8_t *mtu, uint16_t mtu_len)
+int bip6_send_mpdu(
+    const BACNET_IP6_ADDRESS *dest, const uint8_t *mtu, uint16_t mtu_len)
 {
     struct sockaddr_in6 bvlc_dest = { 0 };
     uint16_t addr16[8];
@@ -252,7 +253,7 @@ int bip6_send_mpdu(BACNET_IP6_ADDRESS *dest, uint8_t *mtu, uint16_t mtu_len)
     bvlc_dest.sin6_scope_id = BIP6_Socket_Scope_Id;
     debug_print_ipv6("Sending MPDU->", &bvlc_dest.sin6_addr);
     /* Send the packet */
-    return sendto(BIP6_Socket, (char *)mtu, mtu_len, 0,
+    return sendto(BIP6_Socket, (const char *)mtu, mtu_len, 0,
         (struct sockaddr *)&bvlc_dest, sizeof(bvlc_dest));
 }
 

ports/bsd/datetime-init.c

@@ -27,8 +27,7 @@
  * @param utc - True for UTC sync, False for Local time
  * @return True if time is set
  */
-void datetime_timesync(
-    BACNET_DATE *bdate, BACNET_TIME *btime, bool utc)
+void datetime_timesync(BACNET_DATE *bdate, BACNET_TIME *btime, bool utc)
 {
     (void)bdate;
     (void)btime;

ports/bsd/rs485.c

@@ -396,7 +396,7 @@ bool RS485_Set_Baud_Rate(uint32_t baud)
  *****************************************************************************/
 void RS485_Send_Frame(
     struct mstp_port_struct_t *mstp_port, /* port specific data */
-    uint8_t *buffer, /* frame to send (up to 501 bytes of data) */
+    const uint8_t *buffer, /* frame to send (up to 501 bytes of data) */
     uint16_t nbytes)
 { /* number of bytes of data (up to 501) */
     uint32_t turnaround_time = Tturnaround * 1000;

ports/bsd/rs485.h

@@ -30,7 +30,7 @@ void RS485_Initialize(void);
 BACNET_STACK_EXPORT
 void RS485_Send_Frame(
     struct mstp_port_struct_t *mstp_port, /* port specific data */
-    uint8_t *buffer, /* frame to send (up to 501 bytes of data) */
+    const uint8_t *buffer,  /* frame to send (up to 501 bytes of data) */
     uint16_t nbytes);       /* number of bytes of data (up to 501) */
 
 BACNET_STACK_EXPORT

ports/esp32/src/ai.h

@@ -73,13 +73,13 @@ extern "C" {
         BACNET_CHARACTER_STRING * object_name);
     bool Analog_Input_Name_Set(
         uint32_t object_instance,
-        char *new_name);
+        const char *new_name);
 
-    char *Analog_Input_Description(
+    const char *Analog_Input_Description(
         uint32_t instance);
     bool Analog_Input_Description_Set(
         uint32_t instance,
-        char *new_name);
+        const char *new_name);
 
     bool Analog_Input_Units_Set(
         uint32_t instance,

ports/esp32/src/bip_init.c

@@ -15,7 +15,7 @@ long bip_get_addr_by_name(const char *host_name)
     return 0;
 }
 
-void bip_set_interface(char *ifname)
+void bip_set_interface(const char *ifname)
 {
 }
 

ports/esp32/src/bo.h

@@ -45,13 +45,13 @@ extern "C" {
         uint32_t object_instance,
         char *new_name);
 
-    char *Binary_Output_Description(
+    const char *Binary_Output_Description(
         uint32_t instance);
     bool Binary_Output_Description_Set(
         uint32_t instance,
-        char *new_name);
+        const char *new_name);
 
-    char *Binary_Output_Inactive_Text(
+    const char *Binary_Output_Inactive_Text(
         uint32_t instance);
     bool Binary_Output_Inactive_Text_Set(
         uint32_t instance,

ports/esp32/src/device.c

@@ -381,7 +381,7 @@ bool Device_Object_Name(
     return status;
 }
 
-bool Device_Set_Object_Name(BACNET_CHARACTER_STRING *object_name)
+bool Device_Set_Object_Name(const BACNET_CHARACTER_STRING *object_name)
 {
     bool status = false; /*return value */
 
@@ -689,7 +689,7 @@ bool Device_Object_List_Identifier(
  * Object.
  * @return True on success or else False if not found.
  */
-bool Device_Valid_Object_Name(BACNET_CHARACTER_STRING *object_name1,
+bool Device_Valid_Object_Name(const BACNET_CHARACTER_STRING *object_name1,
     BACNET_OBJECT_TYPE *object_type,
     uint32_t *object_instance)
 {

ports/esp32/src/device.h

@@ -274,7 +274,7 @@ extern "C" {
         uint32_t object_instance,
         BACNET_CHARACTER_STRING * object_name);
     bool Device_Set_Object_Name(
-        BACNET_CHARACTER_STRING * object_name);
+        const BACNET_CHARACTER_STRING * object_name);
     /* Copy a child object name, given its ID. */
     bool Device_Object_Name_Copy(
         BACNET_OBJECT_TYPE object_type,
@@ -340,7 +340,7 @@ extern "C" {
         void);
 
     bool Device_Valid_Object_Name(
-        BACNET_CHARACTER_STRING * object_name,
+        const BACNET_CHARACTER_STRING * object_name,
         BACNET_OBJECT_TYPE *object_type,
         uint32_t * object_instance);
     bool Device_Valid_Object_Id(
@@ -375,7 +375,7 @@ extern "C" {
 
     uint16_t Add_Routed_Device(
         uint32_t Object_Instance,
-        BACNET_CHARACTER_STRING * Object_Name,
+        const BACNET_CHARACTER_STRING * Object_Name,
         const char *Description);
     DEVICE_OBJECT_DATA *Get_Routed_Device_Object(
         int idx);
@@ -388,14 +388,14 @@ extern "C" {
     bool Routed_Device_Address_Lookup(
         int idx,
         uint8_t address_len,
-        uint8_t * mac_adress);
+        const uint8_t * mac_adress);
     bool Routed_Device_GetNext(
-        BACNET_ADDRESS * dest,
-        int *DNET_list,
+        const BACNET_ADDRESS * dest,
+        const int *DNET_list,
         int *cursor);
     bool Routed_Device_Is_Valid_Network(
         uint16_t dest_net,
-        int *DNET_list);
+        const int *DNET_list);
 
     uint32_t Routed_Device_Index_To_Instance(
         unsigned index);

ports/linux/arcnet.c

@@ -69,7 +69,7 @@ void arcnet_cleanup(void)
     return;
 }
 
-static int arcnet_bind(char *interface_name)
+static int arcnet_bind(const char *interface_name)
 {
     int sock_fd = -1; /* return value */
     struct ifreq ifr;

ports/linux/bacport.h

@@ -100,7 +100,7 @@ extern int bip_get_local_netmask(
 
 BACNET_STACK_EXPORT
 extern int bip_get_local_address_ioctl(
-    char *ifname,
+    const char *ifname,
     struct in_addr *addr,
     int request);
 

ports/linux/bip-init.c

@@ -178,7 +178,7 @@ void bip_get_broadcast_address(BACNET_ADDRESS *dest)
  *
  * @param addr - network IPv4 address
  */
-bool bip_set_addr(BACNET_IP_ADDRESS *addr)
+bool bip_set_addr(const BACNET_IP_ADDRESS *addr)
 {
     /* not something we do within this driver */
     (void)addr;
@@ -205,7 +205,7 @@ bool bip_get_addr(BACNET_IP_ADDRESS *addr)
  * @param addr - network IPv4 address
  * @return true if the address was set
  */
-bool bip_set_broadcast_addr(BACNET_IP_ADDRESS *addr)
+bool bip_set_broadcast_addr(const BACNET_IP_ADDRESS *addr)
 {
     /* not something we do within this driver */
     (void)addr;
@@ -273,7 +273,8 @@ uint8_t bip_get_subnet_prefix(void)
  * @return Upon successful completion, returns the number of bytes sent.
  *  Otherwise, -1 shall be returned and errno set to indicate the error.
  */
-int bip_send_mpdu(BACNET_IP_ADDRESS *dest, uint8_t *mtu, uint16_t mtu_len)
+int bip_send_mpdu(
+    const BACNET_IP_ADDRESS *dest, const uint8_t *mtu, uint16_t mtu_len)
 {
     struct sockaddr_in bip_dest = { 0 };
 
@@ -292,7 +293,7 @@ int bip_send_mpdu(BACNET_IP_ADDRESS *dest, uint8_t *mtu, uint16_t mtu_len)
     /* Send the packet */
     debug_print_ipv4(
         "Sending MPDU->", &bip_dest.sin_addr, bip_dest.sin_port, mtu_len);
-    return sendto(BIP_Socket, (char *)mtu, mtu_len, 0,
+    return sendto(BIP_Socket, (const char *)mtu, mtu_len, 0,
         (struct sockaddr *)&bip_dest, sizeof(struct sockaddr));
 }
 
@@ -465,7 +466,8 @@ bool bip_get_addr_by_name(const char *host_name, BACNET_IP_ADDRESS *addr)
  * @param request - the ioctl() request
  * @return 0 on success, else the error from the ioctl() call.
  */
-static int get_local_ifr_ioctl(char *ifname, struct ifreq *ifr, int request)
+static int get_local_ifr_ioctl(
+    const char *ifname, struct ifreq *ifr, int request)
 {
     int fd;
     int rv; /* return value */
@@ -491,7 +493,8 @@ static int get_local_ifr_ioctl(char *ifname, struct ifreq *ifr, int request)
  * @param request - the ioctl() request
  * @return 0 on success, else the error from the ioctl() call.
  */
-int bip_get_local_address_ioctl(char *ifname, struct in_addr *addr, int request)
+int bip_get_local_address_ioctl(
+    const char *ifname, struct in_addr *addr, int request)
 {
     struct ifreq ifr = { 0 };
     struct sockaddr_in *tcpip_address;
@@ -746,7 +749,7 @@ int bip_set_broadcast_binding(
  * @param ifname [in] The named interface to use for the network layer.
  *        Eg, for Linux, ifname is eth0, ath0, arc0, and others.
  */
-void bip_set_interface(char *ifname)
+void bip_set_interface(const char *ifname)
 {
     struct in_addr local_address;
     struct in_addr netmask;
@@ -804,7 +807,7 @@ void bip_set_interface(char *ifname)
     }
 }
 
-static int createSocket(struct sockaddr_in *sin)
+static int createSocket(const struct sockaddr_in *sin)
 {
     int status = 0; /* return from socket lib calls */
     int sockopt = 0;

ports/linux/bip6.c

@@ -188,7 +188,7 @@ void bip6_get_my_address(BACNET_ADDRESS *addr)
  *
  * @param addr - network IPv6 address
  */
-bool bip6_set_addr(BACNET_IP6_ADDRESS *addr)
+bool bip6_set_addr(const BACNET_IP6_ADDRESS *addr)
 {
     return bvlc6_address_copy(&BIP6_Addr, addr);
 }
@@ -208,7 +208,7 @@ bool bip6_get_addr(BACNET_IP6_ADDRESS *addr)
  *
  * @param addr - network IPv6 address
  */
-bool bip6_set_broadcast_addr(BACNET_IP6_ADDRESS *addr)
+bool bip6_set_broadcast_addr(const BACNET_IP6_ADDRESS *addr)
 {
     return bvlc6_address_copy(&BIP6_Broadcast_Addr, addr);
 }
@@ -234,7 +234,8 @@ bool bip6_get_broadcast_addr(BACNET_IP6_ADDRESS *addr)
  * @return Upon successful completion, returns the number of bytes sent.
  *  Otherwise, -1 shall be returned and errno set to indicate the error.
  */
-int bip6_send_mpdu(BACNET_IP6_ADDRESS *dest, uint8_t *mtu, uint16_t mtu_len)
+int bip6_send_mpdu(
+    const BACNET_IP6_ADDRESS *dest, const uint8_t *mtu, uint16_t mtu_len)
 {
     struct sockaddr_in6 bvlc_dest = { 0 };
     uint16_t addr16[8];
@@ -259,7 +260,7 @@ int bip6_send_mpdu(BACNET_IP6_ADDRESS *dest, uint8_t *mtu, uint16_t mtu_len)
     bvlc_dest.sin6_scope_id = BIP6_Socket_Scope_Id;
     debug_print_ipv6("Sending MPDU->", &bvlc_dest.sin6_addr);
     /* Send the packet */
-    return sendto(BIP6_Socket, (char *)mtu, mtu_len, 0,
+    return sendto(BIP6_Socket, (const char *)mtu, mtu_len, 0,
         (struct sockaddr *)&bvlc_dest, sizeof(bvlc_dest));
 }
 

ports/linux/dlmstp.c

@@ -398,16 +398,18 @@ uint16_t MSTP_Get_Send(struct mstp_port_struct_t *mstp_port, unsigned timeout)
  * @param nbytes - number of bytes of data to send
  */
 void MSTP_Send_Frame(
-    struct mstp_port_struct_t *mstp_port, uint8_t *buffer, uint16_t nbytes)
+    struct mstp_port_struct_t *mstp_port,
+    const uint8_t *buffer,
+    uint16_t nbytes)
 {
     RS485_Send_Frame(mstp_port, buffer, nbytes);
 }
 
 static bool dlmstp_compare_data_expecting_reply(
-    uint8_t *request_pdu,
+    const uint8_t *request_pdu,
     uint16_t request_pdu_len,
     uint8_t src_address,
-    uint8_t *reply_pdu,
+    const uint8_t *reply_pdu,
     uint16_t reply_pdu_len,
     uint8_t dest_address)
 {

ports/linux/dlmstp_linux.c

@@ -379,16 +379,18 @@ uint16_t MSTP_Get_Send(struct mstp_port_struct_t *mstp_port, unsigned timeout)
  * @param nbytes - number of bytes of data to send
  */
 void MSTP_Send_Frame(
-    struct mstp_port_struct_t *mstp_port, uint8_t *buffer, uint16_t nbytes)
+    struct mstp_port_struct_t *mstp_port,
+    const uint8_t *buffer,
+    uint16_t nbytes)
 {
     RS485_Send_Frame(mstp_port, buffer, nbytes);
 }
 
 static bool dlmstp_compare_data_expecting_reply(
-    uint8_t *request_pdu,
+    const uint8_t *request_pdu,
     uint16_t request_pdu_len,
     uint8_t src_address,
-    uint8_t *reply_pdu,
+    const uint8_t *reply_pdu,
     uint16_t reply_pdu_len,
     uint8_t dest_address)
 {

ports/linux/ethernet.c

@@ -64,7 +64,7 @@ int setNonblocking(
 #endif
 
 /* opens an 802.2 socket to receive and send packets */
-static int ethernet_bind(struct sockaddr *eth_addr, char *interface_name)
+static int ethernet_bind(struct sockaddr *eth_addr, const char *interface_name)
 {
     int sock_fd = -1; /* return value */
 #if 0
@@ -339,7 +339,7 @@ uint16_t ethernet_receive(BACNET_ADDRESS *src, /* source address */
     return pdu_len;
 }
 
-void ethernet_set_my_address(BACNET_ADDRESS *my_address)
+void ethernet_set_my_address(const BACNET_ADDRESS *my_address)
 {
     int i = 0;
 
@@ -387,7 +387,7 @@ void ethernet_get_broadcast_address(BACNET_ADDRESS *dest)
     return;
 }
 
-void ethernet_debug_address(const char *info, BACNET_ADDRESS *dest)
+void ethernet_debug_address(const char *info, const BACNET_ADDRESS *dest)
 {
     int i = 0; /* counter */
 

ports/linux/mstpsnap.c

@@ -84,7 +84,7 @@ uint16_t MSTP_Get_Send(
  */
 void MSTP_Send_Frame(
     struct mstp_port_struct_t *mstp_port,
-    uint8_t * buffer,
+    const uint8_t * buffer,
     uint16_t nbytes)
 {
     (void)mstp_port;
@@ -141,7 +141,7 @@ static int network_init(const char *name, int protocol)
 }
 
 static void snap_received_packet(
-    struct mstp_port_struct_t *mstp_port, int sockfd)
+    const struct mstp_port_struct_t *mstp_port, int sockfd)
 {
     uint16_t mtu_len = 0; /* number of octets of packet saved in file */
     unsigned i = 0; /* counter */

ports/linux/rs485.c

@@ -355,14 +355,14 @@ bool RS485_Set_Baud_Rate(uint32_t baud)
  *****************************************************************************/
 void RS485_Send_Frame(
     struct mstp_port_struct_t *mstp_port, /* port specific data */
-    uint8_t *buffer, /* frame to send (up to 501 bytes of data) */
+    const uint8_t *buffer, /* frame to send (up to 501 bytes of data) */
     uint16_t nbytes)
 { /* number of bytes of data (up to 501) */
     uint32_t turnaround_time = Tturnaround * 1000;
     uint32_t baud;
     ssize_t written = 0;
     int greska;
-    SHARED_MSTP_DATA *poSharedData = NULL;
+    const SHARED_MSTP_DATA *poSharedData = NULL;
 
     if (mstp_port) {
         poSharedData = (SHARED_MSTP_DATA *)mstp_port->UserData;

ports/linux/rs485.h

@@ -29,7 +29,7 @@ extern "C" {
     BACNET_STACK_EXPORT
     void RS485_Send_Frame(
         struct mstp_port_struct_t *mstp_port,  /* port specific data */
-        uint8_t * buffer,       /* frame to send (up to 501 bytes of data) */
+        const uint8_t * buffer, /* frame to send (up to 501 bytes of data) */
         uint16_t nbytes);       /* number of bytes of data (up to 501) */
 
     BACNET_STACK_EXPORT

ports/lwip/bip.c

@@ -67,7 +67,7 @@ uint32_t bip_stats_drop(void)
  * @param addr - network IPv4 address
  * @return true if the address is set
  */
-bool bip_set_addr(BACNET_IP_ADDRESS *addr)
+bool bip_set_addr(const BACNET_IP_ADDRESS *addr)
 {
     return bvlc_address_copy(&BIP_Address, addr);
 }
@@ -87,7 +87,7 @@ bool bip_get_addr(BACNET_IP_ADDRESS *addr)
  * @param network IPv4 broadcast address
  * @return true if the broadcast address is retrieved
  */
-bool bip_set_broadcast_addr(BACNET_IP_ADDRESS *addr)
+bool bip_set_broadcast_addr(const BACNET_IP_ADDRESS *addr)
 {
     return bvlc_address_copy(&BIP_Broadcast_Address, addr);
 }
@@ -137,7 +137,7 @@ uint16_t bip_get_port(void)
  * @param address - IPv4 address from LwIP
  * @param mac - IP address from BACnet/IP
  */
-static void bip_mac_to_addr(ip4_addr_t *address, uint8_t *mac)
+static void bip_mac_to_addr(ip4_addr_t *address, const uint8_t *mac)
 {
     if (mac && address) {
         address->addr = ((u32_t)((((uint32_t)mac[0]) << 24) & 0xff000000));
@@ -153,7 +153,7 @@ static void bip_mac_to_addr(ip4_addr_t *address, uint8_t *mac)
  * @param address - IPv4 address from LwIP
  * @param port - IPv4 UDP port number
  */
-static int bip_decode_bip_address(BACNET_IP_ADDRESS *baddr,
+static int bip_decode_bip_address(const BACNET_IP_ADDRESS *baddr,
     ip_addr_t *address,
     uint16_t *port)
 {
@@ -215,7 +215,7 @@ static int bip_encode_bip_address(BACNET_IP_ADDRESS *baddr,
  * @return number of bytes sent, or 0 on failure.
  */
 int bip_send_mpdu(
-    BACNET_IP_ADDRESS *dest, uint8_t *mtu, uint16_t mtu_len)
+    const BACNET_IP_ADDRESS *dest, const uint8_t *mtu, uint16_t mtu_len)
 {
     struct pbuf *pkt = NULL;
     /* addr and port in host format */

ports/pic18f6720/mstp.c

@@ -118,7 +118,7 @@
             x++;                     \
     }
 
-bool MSTP_Line_Active(volatile struct mstp_port_struct_t *mstp_port)
+bool MSTP_Line_Active(const volatile struct mstp_port_struct_t *mstp_port)
 {
     return (mstp_port->EventCount > Nmin_octets);
 }
@@ -128,7 +128,7 @@ unsigned MSTP_Create_Frame(uint8_t *buffer, /* where frame is loaded */
     uint8_t frame_type, /* type of frame to send - see defines */
     uint8_t destination, /* destination address */
     uint8_t source, /* source address */
-    uint8_t *data, /* any data to be sent - may be null */
+    const uint8_t *data, /* any data to be sent - may be null */
     unsigned data_len)
 { /* number of bytes of data (up to 501) */
     uint8_t crc8 = 0xFF; /* used to calculate the crc value */
@@ -181,7 +181,7 @@ void MSTP_Create_And_Send_Frame(
     uint8_t frame_type, /* type of frame to send - see defines */
     uint8_t destination, /* destination address */
     uint8_t source, /* source address */
-    uint8_t *data, /* any data to be sent - may be null */
+    const uint8_t *data, /* any data to be sent - may be null */
     unsigned data_len)
 { /* number of bytes of data (up to 501) */
     uint8_t buffer[DLMSTP_MPDU_MAX] = { 0 }; /* buffer for sending */

ports/pic18f6720/mstp.h

@@ -142,7 +142,7 @@ extern "C" {
 
     /* returns true if line is active */
     bool MSTP_Line_Active(
-        volatile struct mstp_port_struct_t *mstp_port);
+        const volatile struct mstp_port_struct_t *mstp_port);
 
     unsigned MSTP_Create_Frame(
         uint8_t * buffer,       /* where frame is loaded */
@@ -150,7 +150,7 @@ extern "C" {
         uint8_t frame_type,     /* type of frame to send - see defines */
         uint8_t destination,    /* destination address */
         uint8_t source, /* source address */
-        uint8_t * data, /* any data to be sent - may be null */
+        const uint8_t * data, /* any data to be sent - may be null */
         unsigned data_len);     /* number of bytes of data (up to 501) */
 
 

ports/pic18f6720/rs485.c

@@ -42,7 +42,7 @@ volatile uint8_t RS485_Tx_Buffer[NEXT_POWER_OF_2(DLMSTP_MPDU_MAX)];
  *****************************************************************************/
 void RS485_Send_Frame(
     volatile struct mstp_port_struct_t *mstp_port, /* port specific data */
-    uint8_t *buffer, /* frame to send (up to 501 bytes of data) */
+    const uint8_t *buffer, /* frame to send (up to 501 bytes of data) */
     uint16_t nbytes)
 { /* number of bytes of data (up to 501) */
     uint16_t i = 0; /* loop counter */

ports/pic18f6720/rs485.h

@@ -28,7 +28,7 @@ extern "C" {
 
     void RS485_Send_Frame(
         volatile struct mstp_port_struct_t *mstp_port,  /* port specific data */
-        uint8_t * buffer,       /* frame to send (up to 501 bytes of data) */
+        const uint8_t * buffer, /* frame to send (up to 501 bytes of data) */
         uint16_t nbytes);       /* number of bytes of data (up to 501) */
 
     /* returns true if there is more data waiting */

ports/pic18f97j60/mstp.c

@@ -118,7 +118,7 @@
             x++;                     \
     }
 
-bool MSTP_Line_Active(volatile struct mstp_port_struct_t *mstp_port)
+bool MSTP_Line_Active(const volatile struct mstp_port_struct_t *mstp_port)
 {
     return (mstp_port->EventCount > Nmin_octets);
 }
@@ -128,7 +128,7 @@ unsigned MSTP_Create_Frame(uint8_t *buffer, /* where frame is loaded */
     uint8_t frame_type,  /* type of frame to send - see defines */
     uint8_t destination, /* destination address */
     uint8_t source,      /* source address */
-    uint8_t *data, /* any data to be sent - may be null */
+    const uint8_t *data, /* any data to be sent - may be null */
     unsigned data_len)
 { /* number of bytes of data (up to 501) */
     uint8_t crc8 = 0xFF; /* used to calculate the crc value */
@@ -181,7 +181,7 @@ void MSTP_Create_And_Send_Frame(
     uint8_t frame_type, /* type of frame to send - see defines */
     uint8_t destination, /* destination address */
     uint8_t source, /* source address */
-    uint8_t *data, /* any data to be sent - may be null */
+    const uint8_t *data, /* any data to be sent - may be null */
     unsigned data_len)
 { /* number of bytes of data (up to 501) */
     uint8_t buffer[DLMSTP_MPDU_MAX] = { 0 }; /* buffer for sending */

ports/pic18f97j60/mstp.h

@@ -142,7 +142,7 @@ extern "C" {
 
     /* returns true if line is active */
     bool MSTP_Line_Active(
-        volatile struct mstp_port_struct_t *mstp_port);
+        const volatile struct mstp_port_struct_t *mstp_port);
 
     unsigned MSTP_Create_Frame(
         uint8_t * buffer,       /* where frame is loaded */
@@ -150,7 +150,7 @@ extern "C" {
         uint8_t frame_type,     /* type of frame to send - see defines */
         uint8_t destination,    /* destination address */
         uint8_t source,         /* source address */
-        uint8_t * data, /* any data to be sent - may be null */
+        const uint8_t * data,   /* any data to be sent - may be null */
         unsigned data_len);     /* number of bytes of data (up to 501) */
 
 

ports/pic18f97j60/rs485.c

@@ -42,7 +42,7 @@ volatile uint8_t RS485_Tx_Buffer[NEXT_POWER_OF_2(DLMSTP_MPDU_MAX)];
  *****************************************************************************/
 void RS485_Send_Frame(
     volatile struct mstp_port_struct_t *mstp_port, /* port specific data */
-    uint8_t *buffer, /* frame to send (up to 501 bytes of data) */
+    const uint8_t *buffer, /* frame to send (up to 501 bytes of data) */
     uint16_t nbytes)
 { /* number of bytes of data (up to 501) */
     uint16_t i = 0; /* loop counter */

ports/pic18f97j60/rs485.h

@@ -28,7 +28,7 @@ extern "C" {
 
     void RS485_Send_Frame(
         volatile struct mstp_port_struct_t *mstp_port,  /* port specific data */
-        uint8_t * buffer,       /* frame to send (up to 501 bytes of data) */
+        const uint8_t * buffer,     /* frame to send (up to 501 bytes of data) */
         uint16_t nbytes);           /* number of bytes of data (up to 501) */
 
     /* returns true if there is more data waiting */

ports/rx62n/device.c

@@ -107,11 +107,12 @@ static struct my_object_functions *Device_Objects_Find_Functions(
 }
 
 static int Read_Property_Common(
-    struct my_object_functions *pObject, BACNET_READ_PROPERTY_DATA *rpdata)
+    const struct my_object_functions *pObject,
+    BACNET_READ_PROPERTY_DATA *rpdata)
 {
     int apdu_len = BACNET_STATUS_ERROR;
     BACNET_CHARACTER_STRING char_string;
-    char *pString = "";
+    const char *pString = "";
     uint8_t *apdu = NULL;
 #if (BACNET_PROTOCOL_REVISION >= 14)
     struct special_property_list_t property_list;

ports/rx62n/ethernet.c

@@ -174,7 +174,7 @@ uint16_t ethernet_receive(BACNET_ADDRESS *src, /* source address */
     return pdu_len;
 }
 
-void ethernet_set_my_address(BACNET_ADDRESS *my_address)
+void ethernet_set_my_address(const BACNET_ADDRESS *my_address)
 {
     int i = 0;
 

ports/stm32f10x/device.c

@@ -103,7 +103,8 @@ static struct my_object_functions *Device_Objects_Find_Functions(
 }
 
 static int Read_Property_Common(
-    struct my_object_functions *pObject, BACNET_READ_PROPERTY_DATA *rpdata)
+    const struct my_object_functions *pObject,
+    BACNET_READ_PROPERTY_DATA *rpdata)
 {
     int apdu_len = BACNET_STATUS_ERROR;
     BACNET_CHARACTER_STRING char_string;
@@ -308,7 +309,7 @@ bool Device_Object_Name(
     return status;
 }
 
-bool Device_Set_Object_Name(BACNET_CHARACTER_STRING *object_name)
+bool Device_Set_Object_Name(const BACNET_CHARACTER_STRING *object_name)
 {
     bool status = false; /*return value */
 
@@ -588,7 +589,7 @@ int Device_Object_List_Element_Encode(
     return apdu_len;
 }
 
-bool Device_Valid_Object_Name(BACNET_CHARACTER_STRING *object_name1,
+bool Device_Valid_Object_Name(const BACNET_CHARACTER_STRING *object_name1,
     BACNET_OBJECT_TYPE *object_type,
     uint32_t *object_instance)
 {

ports/stm32f10x/netport.c

@@ -294,7 +294,7 @@ bool Network_Port_MAC_Address(
  * @return  true if object-name was set
  */
 bool Network_Port_MAC_Address_Set(
-    uint32_t object_instance, uint8_t *mac_src, uint8_t mac_len)
+    uint32_t object_instance, const uint8_t *mac_src, uint8_t mac_len)
 {
     if (mac_len == 1) {
         Object_List[0].MAC_Address[0] = mac_src[0];

ports/stm32f10x/rs485.c

@@ -152,7 +152,7 @@ bool rs485_frame_sent(void)
  * @param nbytes - number of bytes to transmit
  * @return true if added to queue
  */
-void rs485_bytes_send(uint8_t *buffer, /* data to send */
+void rs485_bytes_send(const uint8_t *buffer, /* data to send */
     uint16_t nbytes)
 { /* number of bytes of data */
     uint8_t tx_byte;

ports/stm32f10x/rs485.h

@@ -30,7 +30,7 @@ extern "C" {
     bool rs485_receive_error(
         void);
     void rs485_bytes_send(
-        uint8_t * buffer,
+        const uint8_t * buffer,
         uint16_t nbytes);
 
     uint32_t rs485_baud_rate(

ports/stm32f4xx/device.c

@@ -345,7 +345,7 @@ bool Device_Object_Name(
     return status;
 }
 
-bool Device_Set_Object_Name(BACNET_CHARACTER_STRING *object_name)
+bool Device_Set_Object_Name(const BACNET_CHARACTER_STRING *object_name)
 {
     bool status = false; /*return value */
 
@@ -478,7 +478,7 @@ void Device_UUID_Init(void)
  * @param new_uuid [in] The new UUID to set
  * @param length [in] The length of the new UUID
  */
-void Device_UUID_Set(uint8_t *new_uuid, size_t length)
+void Device_UUID_Set(const uint8_t *new_uuid, size_t length)
 {
     if (new_uuid && (length == sizeof(Device_UUID))) {
         memcpy(Device_UUID, new_uuid, sizeof(Device_UUID));
@@ -603,7 +603,7 @@ int Device_Object_List_Element_Encode(
  * Object.
  * @return True on success or else False if not found.
  */
-bool Device_Valid_Object_Name(BACNET_CHARACTER_STRING *object_name1,
+bool Device_Valid_Object_Name(const BACNET_CHARACTER_STRING *object_name1,
     BACNET_OBJECT_TYPE *object_type,
     uint32_t *object_instance)
 {
@@ -842,7 +842,8 @@ int Device_Read_Property_Local(BACNET_READ_PROPERTY_DATA *rpdata)
  * @return The length of the APDU on success, else BACNET_STATUS_ERROR
  */
 static int Read_Property_Common(
-    struct my_object_functions *pObject, BACNET_READ_PROPERTY_DATA *rpdata)
+    const struct my_object_functions *pObject,
+    BACNET_READ_PROPERTY_DATA *rpdata)
 {
     int apdu_len = BACNET_STATUS_ERROR;
     BACNET_CHARACTER_STRING char_string;

ports/stm32f4xx/netport.c

@@ -299,7 +299,7 @@ bool Network_Port_MAC_Address(
  * @return  true if object-name was set
  */
 bool Network_Port_MAC_Address_Set(
-    uint32_t object_instance, uint8_t *mac_src, uint8_t mac_len)
+    uint32_t object_instance, const uint8_t *mac_src, uint8_t mac_len)
 {
     if (mac_len == 1) {
         Object_List[0].MAC_Address[0] = mac_src[0];