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lib/base/mqtt/mqtt.dart

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+import 'package:mqtt5_client/mqtt5_client.dart';
+import 'package:mqtt5_client/mqtt5_server_client.dart';
+
+class Mqtt {
+  final MqttConfig _config;
+  MqttClient? _client;
+
+  Mqtt(this._config);
+
+  static late Mqtt _mqtt;
+
+  static Mqtt getInstance() {
+    return _mqtt;
+  }
+
+  static void setInstance(Mqtt server) {
+    _mqtt = server;
+  }
+
+  Future<bool> connect() async {
+    if (_client != null) {
+      return true;
+    }
+    _client =
+        MqttServerClient.withPort(_config.host, _config.clientId, _config.port);
+    _client?.autoReconnect = true;
+
+    await _client?.connect(_config.username, _config.password);
+    _client?.updates.listen((List<MqttReceivedMessage<MqttMessage>> message) {
+      final recMess = message[0].payload as MqttPublishMessage;
+      final payload =
+          MqttUtilities.bytesToStringAsString(recMess.payload.message!);
+      _config.messgae(message[0].topic!, payload);
+    });
+    _config.topic?.forEach((topic) {
+      subscribe(topic, _config.qos);
+    });
+
+    return true;
+  }
+
+  void disconnect() {
+    _client?.disconnect();
+    _client = null;
+  }
+
+  void subscribe(String topic, int qos) {
+    _client?.subscribe(topic, MqttUtilities.getQosLevel(qos));
+  }
+
+  void unSubscribe(String topic) {
+    _client?.unsubscribeStringTopic(topic);
+  }
+
+  void publish(String topic, String msg, {int qos = 0}) {
+    var payload = MqttPayloadBuilder();
+    payload.addString(msg);
+    _client?.publishMessage(
+        topic, MqttUtilities.getQosLevel(qos), payload.payload!);
+  }
+}
+
+class MqttConfig {
+  final String host;
+  final int port;
+  final String clientId;
+  String? username;
+  String? password;
+  List<String>? topic;
+  int qos;
+  Function(String topic, String message) messgae;
+
+  MqttConfig(
+      {required this.host,
+      this.port = 1883,
+      required this.clientId,
+      required this.messgae,
+      this.topic,
+      this.qos = 0,
+      this.username,
+      this.password});
+}