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I too have some very strange goings on. Simply adding one line of serial output changes the stability of the code.

Going back to the downloaded code and wrapping the serial prints in dhcp_dns with #ifdef DEBUG and #endif resulted in the node continually restarting. Reversing that change restored stability.

Commenting out the same serial prints also resulted in stable code.

Any guidance much appreciated.

Geoff

You can try this to check your free RAM:

//**********************************************************************************************************************
// SETUP_memory
//**********************************************************************************************************************
void setup_memory() {
  int result = memoryTest();
  Serial.print("Memory:");
  Serial.println(result,DEC);
}

// this function will return the number of bytes currently free in RAM
int memoryTest() {
  int byteCounter = 0; // initialize a counter
  byte *byteArray; // create a pointer to a byte array
  // More on pointers here: http://en.wikipedia.org/wiki/Pointer#C_pointers

  // use the malloc function to repeatedly attempt allocating a certain number of bytes to memory
  // More on malloc here: http://en.wikipedia.org/wiki/Malloc
  while ( (byteArray = (byte*) malloc (byteCounter * sizeof(byte))) != NULL ) {
    byteCounter++; // if allocation was successful, then up the count for the next try
    free(byteArray); // free memory after allocating it
  }
 
  free(byteArray); // also free memory after the function finishes
  return byteCounter; // send back the highest number of bytes successfully allocated
}