subscribe method
Initiates a topic subscription request to the connected broker with a strongly typed data processor callback. The topic to subscribe to. The maximum Qos level. Returns the subscription or null on failure
Implementation
MqttSubscription? subscribe(String topic, MqttQos qosLevel) {
if (connectionStatus!.state != MqttConnectionState.connected) {
throw MqttConnectionException(connectionHandler?.connectionStatus?.state);
}
return subscriptionsManager!.subscribeSubscriptionTopic(topic, qosLevel);
}