Program hang if subscribed topic message packet size exceeds 200 bytes

[cornebester]

Program hung on MQTT::Message &message = md.message;
payload at 184~ bytes + packet headers

If max packet size is increased in mbed_app.json e.g. "mbed-mqtt.max-packet-size": "1024" I can process my payload but only up to 1kB minus packet overhead

I'm using a forked/modified version of https://github.com/coisme/Mbed-to-AWS-IoT, with a mosquitto broker.

Need some error handling, around socket recv buffer overflow ?

[michalpasztamobica]

Hi @cornebester , can you please try the three steps mentioned here, especially step 1?

[cornebester]

Hi Michal. Increasing the "mbed-mqtt.max-packet-size": to "1024" actually solved my problem. I did not have to modify the stack memory.

The concern is that should the payload approach the 1024 limit the issue will resurface. The issue is more about error handling when the size exceeds the default or custom set packet size limit. Program error/hang