dali/bacnet_stack
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Feature/mstp zero config option (#564)

Browse Source 
* Added a MS/TP zero-config (automatically choose an unused MAC address) using an algorithm that starts with MAC=64 and waits for a random number of PFM (minimum of 8 plus modulo 64) before attempting to choose a MAC sequentially from 64..127. The confirmation uses a 128-bit UUID with the MSTP Test Request frame. The modifications are in src/bacnet/datalink/mstp.c and src/bacnet/datalink/dlmstp.c modules enabling any device to use zero-config if enabled. A working demonstration is in the ports/stm32f4xx for the NUCLEO board. Complete unit testing is included.  Options include lurking forever (wait for a router or another master node before joining) or lurking for a minimum time (enables self forming automatic MAC addressing device nodes).
This commit is contained in:
Steve Karg
2024-02-02 11:18:20 -06:00
committed by GitHub
parent 8f576461a8
commit 1f591db6e7
26 changed files with 2138 additions and 599 deletions
Download Patch File Download Diff File Expand all files Collapse all files
ports/linux/dlmstp.c
+6 -8
View File
@@ -75,7 +75,7 @@ static bool run_thread;
/*RT_TASK Receive_Task, Fsm_Task;*/
/* local MS/TP port data - shared with RS-485 */
static volatile struct mstp_port_struct_t MSTP_Port;
static struct mstp_port_struct_t MSTP_Port;
/* buffers needed by mstp port struct */
static uint8_t TxBuffer[DLMSTP_MPDU_MAX];
static uint8_t RxBuffer[DLMSTP_MPDU_MAX];
@@ -287,7 +287,7 @@ static void *dlmstp_master_fsm_task(void *pArg)
if (MSTP_Port.ReceivedValidFrame || MSTP_Port.ReceivedInvalidFrame) {
run_master = true;
} else {
silence = MSTP_Port.SilenceTimer(NULL);
silence = MSTP_Port.SilenceTimer(&MSTP_Port);
switch (MSTP_Port.master_state) {
case MSTP_MASTER_STATE_IDLE:
if (silence >= Tno_token)
@@ -353,7 +353,7 @@ void dlmstp_fill_bacnet_address(BACNET_ADDRESS *src, uint8_t mstp_address)
}
/* for the MS/TP state machine to use for putting received data */
uint16_t MSTP_Put_Receive(volatile struct mstp_port_struct_t *mstp_port)
uint16_t MSTP_Put_Receive(struct mstp_port_struct_t *mstp_port)
{
uint16_t pdu_len = 0;
@@ -384,8 +384,7 @@ uint16_t MSTP_Put_Receive(volatile struct mstp_port_struct_t *mstp_port)
/* for the MS/TP state machine to use for getting data to send */
/* Return: amount of PDU data */
uint16_t MSTP_Get_Send(
volatile struct mstp_port_struct_t *mstp_port, unsigned timeout)
uint16_t MSTP_Get_Send(struct mstp_port_struct_t *mstp_port, unsigned timeout)
{ /* milliseconds to wait for a packet */
uint16_t pdu_len = 0;
uint8_t frame_type = 0;
@@ -421,7 +420,7 @@ uint16_t MSTP_Get_Send(
* @param nbytes - number of bytes of data to send
*/
void MSTP_Send_Frame(
volatile struct mstp_port_struct_t *mstp_port,
struct mstp_port_struct_t *mstp_port,
uint8_t * buffer,
uint16_t nbytes)
{
@@ -584,8 +583,7 @@ static bool dlmstp_compare_data_expecting_reply(uint8_t *request_pdu,
}
/* Get the reply to a DATA_EXPECTING_REPLY frame, or nothing */
uint16_t MSTP_Get_Reply(
volatile struct mstp_port_struct_t *mstp_port, unsigned timeout)
uint16_t MSTP_Get_Reply(struct mstp_port_struct_t *mstp_port, unsigned timeout)
{ /* milliseconds to wait for a packet */
uint16_t pdu_len = 0; /* return value */
bool matched = false;
ports/linux/dlmstp_linux.c
+7 -7
View File
@@ -228,7 +228,7 @@ void *dlmstp_receive_fsm_task(void *pArg)
do {
RS485_Check_UART_Data(mstp_port);
MSTP_Receive_Frame_FSM(
(volatile struct mstp_port_struct_t *)pArg);
(struct mstp_port_struct_t *)pArg);
received_frame = mstp_port->ReceivedValidFrame ||
mstp_port->ReceivedInvalidFrame;
if (received_frame) {
@@ -274,11 +274,11 @@ void *dlmstp_master_fsm_task(void *pArg)
run_master = true;
break;
case MSTP_MASTER_STATE_WAIT_FOR_REPLY:
if (silence >= poSharedData->Treply_timeout)
if (silence >= mstp_port->Treply_timeout)
run_master = true;
break;
case MSTP_MASTER_STATE_POLL_FOR_MASTER:
if (silence >= poSharedData->Tusage_timeout)
if (silence >= mstp_port->Tusage_timeout)
run_master = true;
break;
default:
@@ -324,7 +324,7 @@ void dlmstp_fill_bacnet_address(BACNET_ADDRESS *src, uint8_t mstp_address)
}
/* for the MS/TP state machine to use for putting received data */
uint16_t MSTP_Put_Receive(volatile struct mstp_port_struct_t *mstp_port)
uint16_t MSTP_Put_Receive(struct mstp_port_struct_t *mstp_port)
{
uint16_t pdu_len = 0;
SHARED_MSTP_DATA *poSharedData = (SHARED_MSTP_DATA *)mstp_port->UserData;
@@ -353,7 +353,7 @@ uint16_t MSTP_Put_Receive(volatile struct mstp_port_struct_t *mstp_port)
/* for the MS/TP state machine to use for getting data to send */
/* Return: amount of PDU data */
uint16_t MSTP_Get_Send(
volatile struct mstp_port_struct_t *mstp_port, unsigned timeout)
struct mstp_port_struct_t *mstp_port, unsigned timeout)
{ /* milliseconds to wait for a packet */
uint16_t pdu_len = 0;
uint8_t frame_type = 0;
@@ -391,7 +391,7 @@ uint16_t MSTP_Get_Send(
* @param nbytes - number of bytes of data to send
*/
void MSTP_Send_Frame(
volatile struct mstp_port_struct_t *mstp_port,
struct mstp_port_struct_t *mstp_port,
uint8_t * buffer,
uint16_t nbytes)
{
@@ -555,7 +555,7 @@ bool dlmstp_compare_data_expecting_reply(uint8_t *request_pdu,
/* Get the reply to a DATA_EXPECTING_REPLY frame, or nothing */
uint16_t MSTP_Get_Reply(
volatile struct mstp_port_struct_t *mstp_port, unsigned timeout)
struct mstp_port_struct_t *mstp_port, unsigned timeout)
{ /* milliseconds to wait for a packet */
uint16_t pdu_len = 0; /* return value */
bool matched = false;
ports/linux/dlmstp_linux.h
-10
View File
@@ -87,16 +87,6 @@ typedef struct shared_mstp_data {
/* buffers needed by mstp port struct */
uint8_t TxBuffer[DLMSTP_MPDU_MAX];
uint8_t RxBuffer[DLMSTP_MPDU_MAX];
/* The minimum time without a DataAvailable or ReceiveError event */
/* that a node must wait for a station to begin replying to a */
/* confirmed request: 255 milliseconds. (Implementations may use */
/* larger values for this timeout, not to exceed 300 milliseconds.) */
uint16_t Treply_timeout;
/* The minimum time without a DataAvailable or ReceiveError event that a */
/* node must wait for a remote node to begin using a token or replying to */
/* a Poll For Master frame: 20 milliseconds. (Implementations may use */
/* larger values for this timeout, not to exceed 100 milliseconds.) */
uint8_t Tusage_timeout;
/* Timer that indicates line silence - and functions */
uint16_t SilenceTime;
ports/linux/mstpsnap.c
+7 -7
View File
@@ -59,7 +59,7 @@
#endif
/* local port data - shared with RS-485 */
static volatile struct mstp_port_struct_t MSTP_Port;
static struct mstp_port_struct_t MSTP_Port;
/* buffers needed by mstp port struct */
static uint8_t RxBuffer[DLMSTP_MPDU_MAX];
static uint8_t TxBuffer[DLMSTP_MPDU_MAX];
@@ -83,7 +83,7 @@ static void Timer_Silence_Reset(void *pArg)
}
/* functions used by the MS/TP state machine to put or get data */
uint16_t MSTP_Put_Receive(volatile struct mstp_port_struct_t *mstp_port)
uint16_t MSTP_Put_Receive(struct mstp_port_struct_t *mstp_port)
{
(void)mstp_port;
@@ -93,7 +93,7 @@ uint16_t MSTP_Put_Receive(volatile struct mstp_port_struct_t *mstp_port)
/* for the MS/TP state machine to use for getting data to send */
/* Return: amount of PDU data */
uint16_t MSTP_Get_Send(
volatile struct mstp_port_struct_t *mstp_port, unsigned timeout)
struct mstp_port_struct_t *mstp_port, unsigned timeout)
{ /* milliseconds to wait for a packet */
(void)mstp_port;
(void)timeout;
@@ -107,7 +107,7 @@ uint16_t MSTP_Get_Send(
* @param nbytes - number of bytes of data to send
*/
void MSTP_Send_Frame(
volatile struct mstp_port_struct_t *mstp_port,
struct mstp_port_struct_t *mstp_port,
uint8_t * buffer,
uint16_t nbytes)
{
@@ -117,7 +117,7 @@ void MSTP_Send_Frame(
}
uint16_t MSTP_Get_Reply(
volatile struct mstp_port_struct_t *mstp_port, unsigned timeout)
struct mstp_port_struct_t *mstp_port, unsigned timeout)
{ /* milliseconds to wait for a packet */
(void)mstp_port;
(void)timeout;
@@ -165,7 +165,7 @@ static int network_init(const char *name, int protocol)
}
static void snap_received_packet(
volatile struct mstp_port_struct_t *mstp_port, int sockfd)
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 */
@@ -241,7 +241,7 @@ void signal_init(void)
/* simple test to packetize the data and print it */
int main(int argc, char *argv[])
{
volatile struct mstp_port_struct_t *mstp_port;
struct mstp_port_struct_t *mstp_port;
long my_baud = 38400;
uint32_t packet_count = 0;
int sockfd = -1;
ports/linux/rs485.c
+4 -4
View File
@@ -217,7 +217,7 @@ uint32_t RS485_Get_Baud_Rate(void)
* ALGORITHM: none
* NOTES: none
*****************************************************************************/
uint32_t RS485_Get_Port_Baud_Rate(volatile struct mstp_port_struct_t *mstp_port)
uint32_t RS485_Get_Port_Baud_Rate(struct mstp_port_struct_t *mstp_port)
{
uint32_t baud = 0;
SHARED_MSTP_DATA *poSharedData = (SHARED_MSTP_DATA *)mstp_port->UserData;
@@ -382,7 +382,7 @@ bool RS485_Set_Baud_Rate(uint32_t baud)
* NOTES: none
*****************************************************************************/
void RS485_Send_Frame(
volatile struct mstp_port_struct_t *mstp_port, /* port specific data */
struct mstp_port_struct_t *mstp_port, /* port specific data */
uint8_t *buffer, /* frame to send (up to 501 bytes of data) */
uint16_t nbytes)
{ /* number of bytes of data (up to 501) */
@@ -458,7 +458,7 @@ void RS485_Send_Frame(
* ALGORITHM: none
* NOTES: none
*****************************************************************************/
void RS485_Check_UART_Data(volatile struct mstp_port_struct_t *mstp_port)
void RS485_Check_UART_Data(struct mstp_port_struct_t *mstp_port)
{
fd_set input;
struct timeval waiter;
@@ -694,7 +694,7 @@ void RS485_Print_Ports(void)
#include <string.h>
int main(int argc, char *argv[])
{
volatile struct mstp_port_struct_t mstp_port = { 0 };
struct mstp_port_struct_t mstp_port = { 0 };
uint8_t token_buf[8] = { 0x55, 0xFF, 0x00, 0x7E, 0x07, 0x00, 0x00, 0xFD };
uint8_t pfm_buf[8] = { 0x55, 0xFF, 0x01, 0x67, 0x07, 0x00, 0x00, 0x3E };
long baud = 38400;
ports/linux/rs485.h
+3 -3
View File
@@ -57,16 +57,16 @@ extern "C" {
BACNET_STACK_EXPORT
void RS485_Send_Frame(
volatile struct mstp_port_struct_t *mstp_port, /* port specific data */
struct mstp_port_struct_t *mstp_port, /* port specific data */
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
void RS485_Check_UART_Data(
volatile struct mstp_port_struct_t *mstp_port); /* port specific data */
struct mstp_port_struct_t *mstp_port); /* port specific data */
BACNET_STACK_EXPORT
uint32_t RS485_Get_Port_Baud_Rate(
volatile struct mstp_port_struct_t *mstp_port);
struct mstp_port_struct_t *mstp_port);
BACNET_STACK_EXPORT
uint32_t RS485_Get_Baud_Rate(
void);
ports/stm32f4xx/.vscode/launch.json
Vendored
+4
View File
@@ -17,6 +17,10 @@
"searchDir": [],
"svdFile":"${workspaceRoot}/stm32f429.svd",
"runToEntryPoint": "main",
"liveWatch": {
"enabled": true,
"samplesPerSecond": 1
},
"swoConfig": {
"enabled": true,
"cpuFrequency": 8000000,
ports/stm32f4xx/device.c
+3 -4
View File
@@ -77,7 +77,7 @@ static struct my_object_functions {
properties that are writable or that may change.
The properties that are constant can be hard coded
into the read-property encoding. */
static uint32_t Object_Instance_Number = 103;
static uint32_t Object_Instance_Number = BACNET_MAX_INSTANCE;
static BACNET_DEVICE_STATUS System_Status = STATUS_OPERATIONAL;
static BACNET_CHARACTER_STRING My_Object_Name;
static const char *Device_Name_Default = "stm32f4xx";
@@ -1131,9 +1131,8 @@ void Device_Init(object_functions_t *object_table)
pObject++;
}
dcc_set_status_duration(COMMUNICATION_ENABLE, 0);
if (Object_Instance_Number >= BACNET_MAX_INSTANCE) {
Object_Instance_Number = 103;
srand(Object_Instance_Number);
if (Object_Instance_Number > BACNET_MAX_INSTANCE) {
Object_Instance_Number = BACNET_MAX_INSTANCE;
}
characterstring_init_ansi(&My_Object_Name, Device_Name_Default);
}
ports/stm32f4xx/main.c
+27 -2
View File
@@ -22,7 +22,7 @@
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*************************************************************************/
#include <stdlib.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
@@ -30,7 +30,9 @@
#include "stm32f4xx.h"
#include "stm32f4xx_pwr.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_rng.h"
#include "system_stm32f4xx.h"
#include "bacnet/basic/object/device.h"
#include "bacnet/basic/sys/mstimer.h"
#include "bacnet/basic/sys/ringbuf.h"
#include "bacnet/datalink/datalink.h"
@@ -96,13 +98,36 @@ int main(void)
MSTP_Port.OutputBuffer = Output_Buffer;
MSTP_Port.OutputBufferSize = sizeof(Output_Buffer);
/* user data */
MSTP_Port.ZeroConfigEnabled = true;
MSTP_Port.SlaveNodeEnabled = false;
MSTP_User_Data.RS485_Driver = &RS485_Driver;
MSTP_Port.UserData = &MSTP_User_Data;
dlmstp_init((char *)&MSTP_Port);
dlmstp_set_mac_address(2);
if (MSTP_Port.ZeroConfigEnabled) {
dlmstp_set_mac_address(255);
} else {
/* FIXME: get the address from hardware DIP or from EEPROM */
dlmstp_set_mac_address(1);
}
/* FIXME: get the baud rate from hardware DIP or from EEPROM */
dlmstp_set_baud_rate(DLMSTP_BAUD_RATE_DEFAULT);
/* initialize application layer*/
bacnet_init();
/* FIXME: get the device ID from EEPROM */
Device_Set_Object_Instance_Number(103);
/* seed stdlib rand() with device-id to get pweudo consisten
zero-config poll slot, or use hardware RNG to get a more random slot */
#ifdef BACNET_ZERO_CONFIG_RNG_HARDWARE
/* enable the random number generator hardware */
RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_RNG, ENABLE);
RNG_Cmd(ENABLE);
while (RNG_GetFlagStatus(RNG_FLAG_DRDY) == RESET) {
/* wait for 32-bit random number to generate */
}
srand(RNG_GetRandomNumber());
#else
srand(Device_Object_Instance_Number());
#endif
for (;;) {
if (mstimer_expired(&Blink_Timer)) {
mstimer_reset(&Blink_Timer);
ports/win32/dlmstp-mm.c
+9 -7
View File
@@ -52,7 +52,7 @@ static HANDLE Receive_Packet_Flag;
HANDLE Received_Frame_Flag;
static DLMSTP_PACKET Transmit_Packet;
/* local MS/TP port data - shared with RS-485 */
volatile struct mstp_port_struct_t MSTP_Port;
static struct mstp_port_struct_t MSTP_Port;
/* buffers needed by mstp port struct */
static uint8_t TxBuffer[DLMSTP_MPDU_MAX];
static uint8_t RxBuffer[DLMSTP_MPDU_MAX];
@@ -62,11 +62,12 @@ static uint32_t TimeBeginPeriod;
/* 1-millisecond target resolution */
#define TARGET_RESOLUTION 1
static uint16_t Timer_Silence(void)
static uint16_t Timer_Silence(void *arg)
{
uint32_t now = timeGetTime();
uint32_t delta_time = 0;
(void)arg;
if (SilenceStartTime < now) {
delta_time = now - SilenceStartTime;
} else {
@@ -79,8 +80,9 @@ static uint16_t Timer_Silence(void)
return (uint16_t)delta_time;
}
static void Timer_Silence_Reset(void)
static void Timer_Silence_Reset(void *arg)
{
(void)arg;
SilenceStartTime = timeGetTime();
}
@@ -241,7 +243,7 @@ void dlmstp_fill_bacnet_address(BACNET_ADDRESS *src, uint8_t mstp_address)
}
/* for the MS/TP state machine to use for putting received data */
uint16_t MSTP_Put_Receive(volatile struct mstp_port_struct_t *mstp_port)
uint16_t MSTP_Put_Receive(struct mstp_port_struct_t *mstp_port)
{
uint16_t pdu_len = 0;
BOOL rc;
@@ -266,7 +268,7 @@ uint16_t MSTP_Put_Receive(volatile struct mstp_port_struct_t *mstp_port)
/* for the MS/TP state machine to use for getting data to send */
/* Return: amount of PDU data */
uint16_t MSTP_Get_Send(
volatile struct mstp_port_struct_t *mstp_port, unsigned timeout)
struct mstp_port_struct_t *mstp_port, unsigned timeout)
{ /* milliseconds to wait for a packet */
uint16_t pdu_len = 0;
uint8_t destination = 0; /* destination address */
@@ -303,7 +305,7 @@ uint16_t MSTP_Get_Send(
* @param nbytes - number of bytes of data to send
*/
void MSTP_Send_Frame(
volatile struct mstp_port_struct_t *mstp_port,
struct mstp_port_struct_t *mstp_port,
uint8_t * buffer,
uint16_t nbytes)
{
@@ -420,7 +422,7 @@ bool dlmstp_compare_data_expecting_reply(uint8_t *request_pdu,
/* Get the reply to a DATA_EXPECTING_REPLY frame, or nothing */
uint16_t MSTP_Get_Reply(
volatile struct mstp_port_struct_t *mstp_port, unsigned timeout)
struct mstp_port_struct_t *mstp_port, unsigned timeout)
{ /* milliseconds to wait for a packet */
uint16_t pdu_len = 0; /* return value */
uint8_t destination = 0; /* destination address */
ports/win32/dlmstp.c
+7 -5
View File
@@ -51,7 +51,7 @@ static HANDLE Receive_Packet_Flag;
HANDLE Received_Frame_Flag;
static DLMSTP_PACKET Transmit_Packet;
/* local MS/TP port data - shared with RS-485 */
volatile struct mstp_port_struct_t MSTP_Port;
struct mstp_port_struct_t MSTP_Port;
/* buffers needed by mstp port struct */
static uint8_t TxBuffer[DLMSTP_MPDU_MAX];
static uint8_t RxBuffer[DLMSTP_MPDU_MAX];
@@ -71,11 +71,13 @@ static struct mstimer Silence_Timer;
/* Timer that indicates line silence - and functions */
static uint32_t Timer_Silence(void *pArg)
{
(void)pArg;
return mstimer_elapsed(&Silence_Timer);
}
static void Timer_Silence_Reset(void *pArg)
{
(void)pArg;
mstimer_set(&Silence_Timer, 0);
}
@@ -226,7 +228,7 @@ void dlmstp_fill_bacnet_address(BACNET_ADDRESS *src, uint8_t mstp_address)
}
/* for the MS/TP state machine to use for putting received data */
uint16_t MSTP_Put_Receive(volatile struct mstp_port_struct_t *mstp_port)
uint16_t MSTP_Put_Receive(struct mstp_port_struct_t *mstp_port)
{
uint16_t pdu_len = 0;
BOOL rc;
@@ -252,7 +254,7 @@ uint16_t MSTP_Put_Receive(volatile struct mstp_port_struct_t *mstp_port)
/* for the MS/TP state machine to use for getting data to send */
/* Return: amount of PDU data */
uint16_t MSTP_Get_Send(
volatile struct mstp_port_struct_t *mstp_port, unsigned timeout)
struct mstp_port_struct_t *mstp_port, unsigned timeout)
{ /* milliseconds to wait for a packet */
uint16_t pdu_len = 0;
uint8_t destination = 0; /* destination address */
@@ -288,7 +290,7 @@ uint16_t MSTP_Get_Send(
* @param nbytes - number of bytes of data to send
*/
void MSTP_Send_Frame(
volatile struct mstp_port_struct_t *mstp_port,
struct mstp_port_struct_t *mstp_port,
uint8_t * buffer,
uint16_t nbytes)
{
@@ -405,7 +407,7 @@ static bool dlmstp_compare_data_expecting_reply(uint8_t *request_pdu,
/* Get the reply to a DATA_EXPECTING_REPLY frame, or nothing */
uint16_t MSTP_Get_Reply(
volatile struct mstp_port_struct_t *mstp_port, unsigned timeout)
struct mstp_port_struct_t *mstp_port, unsigned timeout)
{ /* milliseconds to wait for a packet */
uint16_t pdu_len = 0; /* return value */
uint8_t destination = 0; /* destination address */
ports/win32/rs485.c
+2 -2
View File
@@ -421,7 +421,7 @@ bool RS485_Set_Baud_Rate(uint32_t baud)
/* Transmits a Frame on the wire */
void RS485_Send_Frame(
volatile struct mstp_port_struct_t *mstp_port, /* port specific data */
struct mstp_port_struct_t *mstp_port, /* port specific data */
uint8_t *buffer, /* frame to send (up to 501 bytes of data) */
uint16_t nbytes)
{ /* number of bytes of data (up to 501) */
@@ -453,7 +453,7 @@ void RS485_Send_Frame(
}
/* called by timer, interrupt(?) or other thread */
void RS485_Check_UART_Data(volatile struct mstp_port_struct_t *mstp_port)
void RS485_Check_UART_Data(struct mstp_port_struct_t *mstp_port)
{
char lpBuf[1];
DWORD dwRead = 0;
ports/win32/rs485.h
+2 -2
View File
@@ -58,13 +58,13 @@ extern "C" {
BACNET_STACK_EXPORT
void RS485_Send_Frame(
volatile struct mstp_port_struct_t *mstp_port, /* port specific data */
struct mstp_port_struct_t *mstp_port, /* port specific data */
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
void RS485_Check_UART_Data(
volatile struct mstp_port_struct_t *mstp_port); /* port specific data */
struct mstp_port_struct_t *mstp_port); /* port specific data */
BACNET_STACK_EXPORT
uint32_t RS485_Get_Baud_Rate(