Mobile's App is written by Flutter.
Demonstrates how to use mqtt_client with Flutter.
Extends from https://github.com/shamblett/mqtt_client/tree/master/example/flutter
You can install packages mqtt_client from the command line:
$ flutter packages get
You can setup a server through cloundmqtt or mosquitto for the testing. By default in code, information environment for testing is:
String broker = 'm15.cloudmqtt.com';
int port = 14375;
String username = 'wbpwjaso';
String passwd = 'eO-kjpnhyvrI';
String clientIdentifier = 'lamhx';
If it does not work, the service has stopped.
Hope doing well and happy testing!