Make serial speed a compile option

Config.h

@@ -35,6 +35,9 @@
 // For 19.2 MHz
 // #define EXTERNAL_OSC 19200000
 
+// Use a higher baudrate for host communication. Required for FM network !
+// #define SERIAL_SPEED 230400
+
 // Allow the use of the COS line to lockout the modem
 // #define USE_COS_AS_LOCKOUT
 

SerialPort.cpp

@@ -602,7 +602,7 @@ void CSerialPort::setMode(MMDVM_STATE modemState)
 
 void CSerialPort::start()
 {
-  beginInt(1U, 115200);
+  beginInt(1U, SERIAL_SPEED);
 
 #if defined(SERIAL_REPEATER)
   beginInt(3U, 9600);

SerialPort.h

@@ -23,6 +23,10 @@
 #include "Globals.h"
 #include "RingBuffer.h"
 
+#if !defined(SERIAL_SPEED)
+#define SERIAL_SPEED 115200
+#endif
+
 
 class CSerialPort {
 public: