Chore/bacnet-sc-unrelated-cleanup (#620)

* Added required linux Ethernet library for ethernet build

* Added .obj to gitignore

* Fixed BACnet port for APPLE to use BSD in CMake

* Changed format in CMake to enable cleaner SC merge

* Added create-object and delete-object recipes in GCC Makefile

* Added datalink timer to all example OS apps

* Changed most microcontroller ports to use BACAPP_MINIMAL to specify which datatypes can be written.

* Fixed zephyr OS for BACnet/IP warning

* Fixed zephyr OS log to not require log_strdup

* Added writefile API to file object example

* Added API to device-client to make it more robust.

* Added API in network-port object for getting the ASCII object-name

* Added debug print with a timestamp option

* Added debug print with hex dump print

* Added API to network port object for activate and discard

* Added default define for debug with timestamp

* Added prototype in header for disabled debug printf.

* Added fifo peek ahead function to peek at more than one byte.

* Added get-mac value for network port that uses buffer rather than octetstring

apps/readprop/main.c

@@ -194,8 +194,8 @@ static void print_help(char *filename)
            "number.\n"
            "Valid ranges are from 00 to FF (hex) for MS/TP or ARCNET,\n"
            "or an IP string with optional port number like 10.1.2.3:47808\n"
-           "or an Ethernet MAC in hex like 00:21:70:7e:32:bb\n"
-           "\n");
+           "or an Ethernet MAC in hex like 00:21:70:7e:32:bb\n");
+    printf("\n");
     printf("device-instance:\n"
            "BACnet Device Object Instance number that you are\n"
            "trying to communicate to.  This number will be used\n"
@@ -417,6 +417,7 @@ int main(int argc, char *argv[])
         if (current_seconds != last_seconds) {
             tsm_timer_milliseconds(
                 (uint16_t)((current_seconds - last_seconds) * 1000));
+            datalink_maintenance_timer(current_seconds - last_seconds);
         }
         if (Error_Detected) {
             break;