sendListenRequest method
Implementation
AsyncReply<dynamic> sendListenRequest(int instanceId, int index) {
var reply = new AsyncReply<dynamic>();
var c = _callbackCounter++;
_requests.add(c, reply);
sendParams()
..addUint8(0x40 | IIPPacketAction.Listen)
..addUint32(c)
..addUint32(instanceId)
..addUint8(index)
..done();
return reply;
}