Cellular IoT Fundamentals, Lesson 4, Exercise 1, MQTT LED1 ON/OFF not working

[vorrias]

Hi ,

I am running "Cellular IoT Fundamentals".
In Lesson 4, Exercise 1, has MQTT communication.
Everything went well up to the point where I have to PUBLISH from MQTT Explorer LED1ON and LED1OFF
I have no response on nRF9160 DK LED1 (LED2 is on which means connection is OK)
Pressing the Button 1 nRF9160 DK publishes the message to MQTT server as seen from images

What am I doing wrong?

Thanks

Vasilis

[Øyvind]

Hello, 

Difficult to tell from the information provided. Do you have any logs trom the nRF9160 kit itself? What version of the nRF Connect SDK are you running and with what modem fw on your device?

Kind regards,
Øyvind

[Neso]

I have the same problem on Thingy91 with nRF Connect SDK v2.8.0 and Modem Firmware v1.3.4

[00:01:25.274,353] <inf> Lesson4_Exercise1: Publishing: Hi from the nRF91 Series device
[00:01:25.274,414] <inf> Lesson4_Exercise1: to topic: devacademy/publish/topic len: 24
[00:01:25.375,213] <inf> Lesson4_Exercise1: RRC mode: Connected
[00:01:25.570,434] <inf> Lesson4_Exercise1: PUBACK packet id: 17426
[00:01:32.185,729] <inf> Lesson4_Exercise1: RRC mode: Idle
[00:02:25.826,171] <inf> Lesson4_Exercise1: RRC mode: Connected
[00:02:26.005,065] <inf> Lesson4_Exercise1: MQTT PUBLISH result=0 len=7
[00:02:26.005,157] <inf> Lesson4_Exercise1: Received: LED1OFF
[00:02:33.163,696] <inf> Lesson4_Exercise1: RRC mode: Idle

[Neso]

So this was actually working. The green led is so bright, it's hard to see the yellow turn on/off.

[vorrias]

Thanks Neso for your time. Actually I passed the tests and got the certificate without this test.

Anyway I will try it using my Thingy91 when I find some time.

Thank a lot

Regards