Instead, the project under IDE_Mqtt folder of X-CUBE-CELLULAR 5.2.x work fine, because it uses IAR Compiler and Embedded Workbench IDE (downloaded under 30day evaluation).
The sample code provided, I was able to test it using Stackhero Node-RED Dashboard, very useful to have a quick demo out-of-the-box.
But I've spent some days to investigate w/o success the reason why using GCC compiler (after adding MQTT/MBedTLS libs files and #defines, on duplicating an existing STM32CUbeIDE project) this demo crash with an HardFault when executing the code in the snippets and called by mqtt_connect(). - Tested with ST-LINK and Debug code prj.
struct mqtt_queued_message* mqtt_mq_register(struct mqtt_message_queue *mq, size_t nbytes)
{
/* make queued message header */
--(mq->queue_tail);
mq->queue_tail->start = mq->curr;
mq->queue_tail->size = nbytes;
mq->queue_tail->state = MQTT_QUEUED_UNSENT;
/* move curr and recalculate curr_sz */
mq->curr += nbytes;
mq->curr_sz = mqtt_mq_currsz(mq);
return mq->queue_tail;
}
So Cellular connection is established, context CID=1 up and running, with DNS server name resolved, so the modem is not failing. MQTT socket also is connected with the remote server, but packing the data to transfer leads to the issue.
Please STM could have a look, or already have an answer as maybe this was the reason to not include such MQTT project for STM32CUbeIDE in the X-CUBE-CELLUALR 5.2.0 release?
TYIA
Paolo
s
