API
MQTT Client Interface
MQTT Client Interface represents the object that handles all communication with MQTT broker. It provides a set of methods that allow performing basic operations defined in MQTT protocol.
To create MQTT client call CreateMqttClient function. It takes MqttClientConfig structure as a parameter which specifies client settings like host URL, port number, client ID.
To establish connection with MQTT broker call Connect function on MQTT Client. Client connects to broker which was specified by MqttClientConfig structure during its creation. The function takes MqttConnectionData structure as a parameter which specifies users login and password.
To disconnect from MQTT broker call Disconnect function on MQTT Client.
To subscribe to a topic that the client is interested in call Subscribe function on MQTT Client. It takes topic name (as string) and quality of service (int value) as parameters.
To usubscribe from a topic call Unsubscribe function on MQTT Client. It takes topic name (as string) as a parameter.
To publish message to MQTT broker call Publish function on MQTT Client. It takes MqttMessage structure as a parameter which specifies message content, topic, quality of service and whether message should be retained.
MQTT Client can listen to several events triggered by MQTT broker during their communication. To receive and process certain callback corresponding handler should be set for MQTT Client.