我使用的是Android Paho客户端库v1.1.0,QoS 2。 我在MQTT上的pub / sub代码:
mClient = new MqttAndroidClient(this, uri, clientId, new MqttDefaultFilePersistence());
MqttConnectOptions conOpt = new MqttConnectOptions();
conOpt.setMqttVersion(MqttConnectOptions.MQTT_VERSION_3_1);
conOpt.setCleanSession(true);
conOpt.setAutomaticReconnect(true);
mClient.setTraceEnabled(true);
mClient.setCallback(this);
mClient.setTraceCallback(this);
IMqttToken connectToken = mClient.connect(conOpt, null, this);
离线缓冲选项:
@Override
public void onSuccess(IMqttToken iMqttToken) {
this.disconnectedBufferOptions = new DisconnectedBufferOptions();
this.disconnectedBufferOptions.setBufferEnabled(true);
mClient.setBufferOpts(disconnectedBufferOptions);
subscribe(topic);
}
如果网络可用,则发布到主题的消息,但是如果它已禁用并再次启用脱机消息而不是发送。 如何正确启用离线缓冲选项并发送离线消息? 附加信息:禁用网络并发布message = 0后的mClient.getBufferedMessageCount()
答案 0 :(得分:1)
使用conOpt.setAutomaticReconnect(true)以及连接令牌的onSuccess中的以下代码片段为我解决了这个问题。
DisconnectedBufferOptions disconnectedBufferOptions = new DisconnectedBufferOptions();
disconnectedBufferOptions.setBufferEnabled(true);
disconnectedBufferOptions.setBufferSize(100);
disconnectedBufferOptions.setPersistBuffer(false);
disconnectedBufferOptions.setDeleteOldestMessages(false);
mClient.setBufferOpts(disconnectedBufferOptions);