Define maximum AX.25 payload size

loraprs_service.cpp

@@ -229,7 +229,7 @@ void Service::onAprsisDataAvailable()
 
 bool Service::sendAX25ToLora(const AX25::Payload &payload) 
 {
-  byte buf[512];
+  byte buf[CfgMaxAX25PayloadSize];
   int bytesWritten = payload.ToBinary(buf, sizeof(buf));
   if (bytesWritten <= 0) {
     Serial.println("Failed to serialize payload");

loraprs_service.h

@@ -102,6 +102,7 @@ private:
   const int CfgPollDelayMs = 5;
   const int CfgLoraTxQueueSize = 4096;
   const int CfgWiFiConnRetryMaxTimes = 10;
+  const int CfgMaxAX25PayloadSize = 512;
 
   // csma paramters, use lower value for high traffic, use 255 for real time
   const long CfgCsmaPersistence = 100;