MQTTc_Publish

Owned by Former user (Deleted)
Last updated: Jan 26, 2021 by WES Admin
2 min read

Send a 'Publish' message to MQTT server.

Files

mqtt-c.h/mqtt-c.c

Prototype

void  MQTTc_Publish (       MQTTc_CONN    *p_conn,
                            MQTTc_MSG     *p_msg,
                     const  CPU_CHAR      *topic_str,
                            CPU_INT08U     qos_lvl,
                            CPU_BOOLEAN    retain_flag,
                     const  CPU_CHAR      *p_payload,
                            CPU_INT32U     payload_len,
                            MQTTc_ERR     *p_err);

Arguments

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

Returned Values

None.

Required Configuration

None.

Notes / Warnings

  • 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).