code: def receive():
      header = _in_file.read(16)
      l = int(header[2:])
      command = header[:2].decode("utf8")
      data = _in_file.read(l).decode("utf8")
      return command, data
  
label_desc: Use image node_id 2 for calling a global function with example usage: receive() and returns: command,  data