publishMessage method
发送消息
Implementation
int publishMessage(String pTopic, String msg,
{MqttQos qos = MqttQos.atLeastOnce}) {
Uint8Buffer uint8buffer = Uint8Buffer();
var codeUnits = msg.codeUnits;
uint8buffer.addAll(codeUnits);
return mqttClient!.publishMessage(pTopic, qos, uint8buffer, retain: false);
}