Android MQTT Message Push usage

Initialize the SDK:

/** * Initialize SDK * * @param context context */public void INITSDK (context context) {String Clienti        D = string.valueof (System.currenttimemillis () +userid);        Mqttandroidclient = new Mqttandroidclient (Mcontext, Serveruri, clientId);        Subscriptiontopics = new arraylist<> (); Mqttandroidclient.setcallback (New mqttcallbackextended () {@Override public void connectcomplete (boo Lean reconnect, String Serveruri) {if (reconnect) {LOG.D (TAG, "reconnected to:" + SE                    Rveruri);                    Because Clean Session was true, we need to re-subscribe//subscribetotopic ();                PublishMessage ();                } else {log.d (TAG, "Connected to:" + Serveruri);                } connectsuccess = true;            Subscribetotopic ();      } @Override public void Connectionlost (Throwable cause) {          Connectsuccess = false;            LOG.E (TAG, "The Connection was lost." + cause.getlocalizedmessage ());            }//This DOES not work! @Override public void messagearrived (String topic, Mqttmessage message) throws Exception {LOG.D            (TAG, "Incoming message:" +topic+ new String (Message.getpayload ()));    } @Override public void Deliverycomplete (Imqttdeliverytoken token) {}}); }

Connecting remote services:

/** * Connect Remote service */public void ConnectServer () {mqttconnectoptions mqttconnectoptions = new mqttconnectopt        Ions ();        Mqttconnectoptions.setautomaticreconnect (TRUE);        Mqttconnectoptions.setcleansession (FALSE);            try {//addtohistory ("Connecting to" + Serveruri); Mqttandroidclient.connect (mqttconnectoptions, NULL, new Imqttactionlistener () {@Override PU                    Blic void onsuccess (Imqtttoken asyncactiontoken) {connectsuccess = true;                    Disconnectedbufferoptions disconnectedbufferoptions = new Disconnectedbufferoptions ();                    Disconnectedbufferoptions.setbufferenabled (TRUE);                    Disconnectedbufferoptions.setbuffersize (100);                    Disconnectedbufferoptions.setpersistbuffer (FALSE);                    Disconnectedbufferoptions.setdeleteoldestmessages (FALSE);    Mqttandroidclient.setbufferopts (disconnectedbufferoptions);            } @Override public void OnFailure (Imqtttoken asyncactiontoken, Throwable excepti                    ON) {LOG.E (TAG, "Failed-connect to:" + Serveruri);                    Exception.printstacktrace ();                    LOG.D (TAG, "onfailure:" + exception.getcause ());                Connectsuccess = false;        }            });        } catch (Mqttexception ex) {ex.printstacktrace (); }    }

Get subscription information:

/**     * Get subscription information
*/

Get subscription information        if (!subscriptiontopics.contains (Gatewayid)) {            subscriptiontopics.add (Gatewayid);        }        LOG.D (TAG, "Pre sub Topic:connect status=" + connectsuccess);        LOG.D (TAG, "subtopic" + subscriptiontopics);        Subscribetotopic ();    }

　　

To subscribe to an MQTT message:

/** * Subscribe to MQTT messages */private void Subscribetotopic () {try {if (subscriptiontopics.size () ==0)            Return            string[] topics = new string[subscriptiontopics.size ()];            Subscriptiontopics.toarray (topics);            int[] Qoc = new Int[topics.length];            imqttmessagelistener[] mqttmessagelisteners = new Imqttmessagelistener[topics.length]; for (int i = 0; i < topics.length; i++) {Imqttmessagelistener Mqttmessagelistener = new Imqttmessagelis Tener () {@Override public void messagearrived (String topic, mqttmessage message) th Rows Exception {//message arrived! messages are processed after delivery log.d (TAG, topic + ":" + NE                        W String (Message.getpayload ()));                    Handlereceivedmessage (New String (Message.getpayload ()), topic);                }                }; Mqttmessagelisteners[i] = Mqttmessagelistener;                LOG.D (TAG, "subscribetotopic:qoc=" + qoc[i]);                } mqttandroidclient.subscribe (topics, QOC, NULL, new Imqttactionlistener () {@Override                public void onsuccess (Imqtttoken imqtttoken) {log.d (TAG, "subscribed!");                    } @Override public void OnFailure (Imqtttoken imqtttoken, Throwable throwable) {                LOG.D (TAG, "Failed to subscribe");        }}, Mqttmessagelisteners);            } catch (Mqttexception ex) {System.err.println ("Exception whilst subscribing");        Ex.printstacktrace (); }    }

To process the received message:

private void Handlereceivedmessage (String message, String Gatewayid) {//Can send a broadcast notifier}    

　　

To send an MQTT message:

/**     * Send MQTT message     *     * @param publishmessage the message to send *    /private void PublishMessage (string PublishMessage, String publishtopic) {            try {                publishtopic = userId + "/" + Publishtopic;                Mqttmessage message = new Mqttmessage ();                Message.setpayload (Publishmessage.getbytes ());                Mqttandroidclient.publish (publishtopic, message);                LOG.D (TAG, "Publishmessage:message Published \ n" + publishtopic + ":" + Message);                if (!mqttandroidclient.isconnected ()) {                    log.d (TAG, Mqttandroidclient.getbufferedmessagecount () + "messages in Buffer. ");                }            } catch (Mqttexception e) {                System.err.println ("Error Publishing:" + e.getmessage ());                E.printstacktrace ();            }    }

　　

There are no encapsulated classes:

public class Subscribeclient {private final static String connection_string = "TCP://MQTT address: Mqtt Port";    Private Final Static Boolean Clean_start = true;    Private final static short keep_alive = 30;//low-power network, but need to get data in time, heartbeat 30s private final static String client_id = "Client1";    Private final static string[] TOPICS = {//subscription information};    Private final static int[] Qos_values = {0, 0, 2, 0};    Private mqttclient mqttclient = null;            Public subscribeclient (String i) {try {mqttclient = new mqttclient (connection_string);            Simplecallbackhandler Simplecallbackhandler = new Simplecallbackhandler (); Mqttclient.registersimplehandler (Simplecallbackhandler);//Register to Receive Message method Mqttclient.connect (client_id + i, CLEAN_STAR            T, keep_alive); Mqttclient.subscribe (TOPICS, qos_values);//Subscribe to the topic/** * After completing your subscription, you can increase your heartbeat, keep your network open, or post your own messages * /Mqttclient.publish (Publish_topics, "KeepAlive". GetBytes (), QOS_values[0], true);        } catch (Mqttexception e) {//TODO auto-generated catch block E.printstacktrace (); }}/** * Simple callback function to handle the subject message received by the client * * @author Pig */class Simplecallbackhandler implements Mqtts Implecallback {/** * triggers when the client and broker are disconnected unexpectedly * you can re-subscribe this process * * @Override public Voi D Connectionlost () throws Exception {//TODO auto-generated Method Stub System.out.println ("Client and Bro        Ker has been disconnected "); /** * After a client subscribes to a message, the method is responsible for callback receive processing message */@Override public void publisharrived (String topicna            Me, byte[] payload, int Qos, Boolean retained) throws Exception {//TODO auto-generated method stub            SYSTEM.OUT.PRINTLN ("Subscription topic:" + topicname);            SYSTEM.OUT.PRINTLN ("message data:" + new String (payload));            SYSTEM.OUT.PRINTLN ("message Level (0,1,2):" + Qos); System.out.println ("is the message sent in real time (false= real-time, true= the last message left on the server):"+ retained);        }}/** * Advanced callback * * @author Pig */class Advancedcallbackhandler implements Mqttsimplecallback {        @Override public void Connectionlost () throws Exception {//TODO auto-generated method stub                                   } @Override public void publisharrived (String arg0, byte[] arg1, int arg2,     Boolean Arg3) throws Exception {//TODO auto-generated Method stub}}/** * @param args */public static void main (string[] args) {//TODO auto-generated method Stub new Subscribeclient (""    + i); }}

　　

Android MQTT Message Push usage