Unsubscribes from a given array of topic filters with a timeout.

IotMqttError_t IotMqtt_UnsubscribeSync( IotMqttConnection_t mqttConnection,
                                        const IotMqttSubscription_t * pSubscriptionList,
                                        size_t subscriptionCount,
                                        uint32_t flags,
                                        uint32_t timeoutMs );

This function sends an MQTT UNSUBSCRIBE packet to the server, then waits for a server response to the packet. Internally, this function is a call to IotMqtt_UnsubscribeAsync followed by IotMqtt_Wait. See IotMqtt_UnsubscribeAsync for more information about the MQTT UNSUBSCRIBE operation.

Parameters

[in]	mqttConnection	The MQTT connection used for the subscription.
[in]	pSubscriptionList	Pointer to the first element in the array of subscriptions.
[in]	subscriptionCount	The number of elements in pSubscriptionList.
[in]	flags	Flags which modify the behavior of this function. See MQTT Function Flags. Flags are currently ignored but reserved for future use.
[in]	timeoutMs	If the MQTT server does not acknowledge the UNSUBSCRIBE within this timeout in milliseconds, this function returns IOT_MQTT_TIMEOUT.

Returns

One of the following: