Thingy 91x aws iot failure

[odik]

trace-2025-10-19T13-19-36.277Z.mtrace

I have succesfully tested my software that sends gnss location to aws iot with nrf9151dk. Recently I configured software also support also thingy91x. My problem is that Aws iot connection drops shortly after connection with following logs:

[00:00:24.660,186] <err> net_mqtt_rx: [CID 0x2001b880]: Connection closed.

[00:00:24.660,247] <inf> net_mqtt_sock_tls: Closing socket 3

[00:00:24.661,132] <dbg> aws_iot: on_disconnect: MQTT client disconnected: result = -128

[00:00:24.661,163] <inf> aws_iot_thread: AWS_IOT_EVT_DISCONNECTED

[00:00:24.661,193] <err> mqtt_helper: Cloud MQTT input error: -128

Certificates should be fine and aws logs show that connection loss is caused by client error. I'm little confused because same code works completly fine with dk but fails with thingy.

[Hakon]

Hello,

can you please provide a modem trace, and make sure that the failed connection attempt is part of it?

[odik]

Sorry for the delay, I have been busy with other projects. Modem trace is now added to attachments.

[Hakon]

Thanks, I don't see any clear cause. But I have forwarded the trace to the modem team so they can also have a look.