/* Callback when receiving data on a specific channel. The arguments
* of the function are the xbee device, the channel ID, the type of
* the frame (example: XBEE_TYPE_ATRESP), the pointer to the frame,
/* Callback when receiving data on a specific channel. The arguments
* of the function are the xbee device, the channel ID, the type of
* the frame (example: XBEE_TYPE_ATRESP), the pointer to the frame,