I am using MQTT-C in a bare-metal project on Keil MDK 5 and I encountered an issue with memory alignment.
I noticed that the returned structure members from mqtt_mq_get were shifted by 1 or more bits. Then leading to messages with the wrong payload size and some other random errors.
The problem stopped when I added the packed attribute to the struct mqtt_queued_message.
I am using MQTT-C in a bare-metal project on Keil MDK 5 and I encountered an issue with memory alignment. I noticed that the returned structure members from
mqtt_mq_getwere shifted by 1 or more bits. Then leading to messages with the wrong payload size and some other random errors.The problem stopped when I added the
packedattribute to the structmqtt_queued_message.Before:
struct mqtt_queued_message {After:
struct __attribute__((packed)) mqtt_queued_message {I don't know if it's the best solution but it fixed my problem, so I thought I should report it.