MQTTc_Publish

Send a 'Publish' message to MQTT server.

mqtt-c.h/mqtt-c.c

p_conn

Pointer to MQTTc Connection to use.

p_msg

Pointer to MQTTc Message object to use.

topic_str

String containing the topic on which to publish. Must stay valid until the message has been completely sent.

qos_lvl

Level of QoS at which to publish.

retain_flag

Flag indicating if the retain flag in the PUBLISH header needs to be set.

p_payload

Pointer to the payload to publish. Must stay valid until the message has been completely sent.

payload_len

The length of the payload to publish.

p_err

Pointer to variable that will receive the return error code from this function:

MQTTc_ERR_NONE

MQTTc_ERR_NOT_INIT

MQTTc_ERR_NULL_PTR

MQTTc_ERR_INVALID_ARG

MQTTc_ERR_INVALID_BUF_SIZE

MQTTc_ERR_FAIL

None.

None.

This function MUST be called after the µC/MQTT-client initialization has been completed.
Both the MQTTc_CONN object and the MQTTc_MSG object used MUST stay valid until the message has completed (callback has been called).