Now also flush buffer when waiting for read

firmware/drivers/communicator/communicator.cpp

@@ -30,6 +30,10 @@ double checkFreeMemory() {
 
 
 bool Communicator::communicate(){
+    if (SERCHAN.available() >= SERIAL_BUFFER_SIZE) {
+        Serial.println("Warning: Serial buffer overflow!");
+        flushSerialBuffer_(); // Clear it to prevent overflow issues
+    }
     if(!serialCharAvailable_()){ //no communication
         if(msElapsedSinceLastTransaction_() > interval_assume_eow_ms_){
             //no sign of supervision for 30 minutes, shut down
@@ -255,3 +259,9 @@ unsigned long Communicator::msElapsedSinceLastTransaction_(){
 }
 
 
+void Communicator::flushSerialBuffer_(){
+    while (SERCHAN.available()) {
+        SERCHAN.read(); // Dump any remaining data
+    }
+}
+