RE: Warning passing data to mqttsn_client_publish

amorenza — Tue, 27 Apr 2021 20:34:37 GMT

The warning pointed to the third argument of the function which should be:

/**@brief Publishes data to given topic.  
 *
 * @param[inout] p_client       Pointer to initialized and connected client.
 * @param[in]    topic_id       Value of previously registered topic ID. 
 * @param[in]    p_payload      Data to be published.
 * @param[in]    payload_len    Length of data to be published.
 * @param[out]   msg_id         (optional) Pointer to message ID assigned to the message by client. 
 *
 * @return       NRF_SUCCESS if the publish request has been sent successfully.
 *               Otherwise error code is returned.
 */
uint32_t mqttsn_client_publish(mqttsn_client_t * p_client,
                               uint16_t          topic_id,
                               const uint8_t   * p_payload,
                               uint16_t          payload_len,
                               uint16_t        * msg_id);

Deleting the & did the trick and the warning is disabled now.

Thank you!!

RE: Warning passing data to mqttsn_client_publish

awneil — Tue, 27 Apr 2021 20:07:05 GMT

[quote userid="103451" url="~/f/nordic-q-a/74508/warning-passing-data-to-mqttsn_client_publish"]

The code compiles but in the line where I call the function, segger shows a warning about incompatible pointer types.

[/quote]

Post the complete text of the message - it usually includes a description of which parameter it's talking about, and why it thinks them "incompatible"

Remember that an array name in C is, effectively, a pointer to the 1st element - so you don't need the &.

If you do use the &, it should be &readInfo[0]

http://c-faq.com/aryptr/index.html - in particualr, c-faq.com/.../aryptrequiv.html