MQTT_CancelCallback

Cancels an outgoing publish callback (only for QoS > QoS0) by removing it from the pending ACK list.

MQTTStatus_t MQTT_CancelCallback( const MQTTContext_t * pContext,
                                  uint16_t packetId );

Note

This cannot cancel the actual publish as that might have already been sent to the broker. This only removes the details of the given packet ID from the list of unACKed packet. That allows the caller to free any memory associated with the publish payload, topic string etc. Also, after this API call, the user provided callback will not be invoked when the ACK packet is received.

Parameters

[in]	pContext	Initialized MQTT context.
[in]	packetId	packet ID corresponding to the outstanding publish.

Returns

MQTTBadParameter if invalid parameters are passed; MQTTSuccess otherwise.