1.1.18.8 Connection

To connect to a MQTT broker the application should:

• Configure the broker with WDRV_WINC_MQTTBrokerSet optionally applying a TLS context if secure connections are required.

• Configure the client credentials with WDRV_WINC_MQTTClientCfgSet.

• Register a user property callback with WDRV_WINC_MQTTUserPropCallbackSet.

• Establish a Will Message with WDRV_WINC_MQTTLWTSet.

• Initialize connection properties, if required.

• Connect to the broker with WDRV_WINC_MQTTConnect.

WDRV_WINC_MQTT_CONN_PROP connProp;

/* Initialize the connection property structure to default values. */
WDRV_WINC_MQTTConnPropDefaultSet(&connProp);

/* Set the Topic Alias Maximum property to 100. */
WDRV_WINC_MQTTConnPropTopicAliasMaxSet(&connProp, 100);

/* Broker address is mqtts://mqtt.example.com:8883. */
WDRV_WINC_MQTTBrokerSet(wdrvHandle, "mqtt.example.com", 8883, tlsHandle);

/* Set the client ID and username/password for the user account. */
WDRV_WINC_MQTTClientCfgSet(wdrvHandle, "clientID", "username", "password");

/* Set the user property callback. */
WDRV_WINC_MQTTUserPropCallbackSet(wdrvHandle, mqttUserPropCallback);

/* Connect to broker using a clean session, keep alive = 0 and protocol version 5. */
WDRV_WINC_MQTTConnect(wdrvHandle, true, 0, WDRV_WINC_MQTT_PROTO_VER_5, &connProp, mqttConnCallback, 0);