How to get correct MQTT tcp ? project in Android Studio -

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here code

    @override     protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      try {         //xxx.xxx.xxx.xx:xx problem         mqttclient client = new mqttclient("tcp://xxx.xxx.xxx.xx:xx", mqttclient.generateclientid());                } catch (mqttexception e) {         e.getmessage(); // client null     }

what correct tcp address ? computer tcp ? or phone tcp ? how ?

i try computer tcp , phone ip , "client null "


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