Weird output from serial port

[Ivan Popov]

Hello,

In short, my use case is that I'm trying to onboard a Thingy:91 to AWS IoT Core through the available code sample following this tutorial (and the related library description linked in it).

What I did successfully was: 

1. I managed to provision the certificates to the device (I can see them listed along with the default ones with the AT%CMNG=1 command).
2. I created a project from the sample (aws_iot), edited the required properties (AWS MQTT endpoint, device_id, topics, ...) and managed to build it in VSCode for the thingy91_nrf9160_ns target.
3. I flashed the resulting app_signed.hex file on the device with the Programmer application (it took ~50 seconds).

However, on rebooting the device in regular mode I get nothing in AWS IoT Core - nothing in the topics, nothing for the shadow.

I tried to get some clues from the serial terminal but all I get is a blank, black terminal. (Interestingly executing commands in the LTE Link Monitor is successful ...)

I tried to play a bit with the ports and their options but the only visible result was on the second (not the default for any of the previously (successfully) executed operations) port and it looked like the wrong Baud Rats was given:

Any ideas on how to proceed and how to determine what might be wrong? I've followed the tutorials as closely as possible, yet we're here.

Best regards,

Ivan Popov

[Ivan Popov]

Hello Håkon,

Thanks for this answer, it clears a bit my perspective but I still need to clear up something.

So

• there are Thingy:91 related code samples, like the aws_iot, the blinky, etc., which I can build and flash on the board (and I obviously did) and then 
• there are Thingy:91 related code samples, like the asset_tracker_v2, which I can not for reasons related to boot partitioning layout/size?

This brings for me at least the following two questions:

• How the first groups of code samples is not affected by the limitation of the second one?
• Can I use the aws_iot code sample, tweak it a bit (add the parts of the code from the asset tracker which gather and report the sensors data - which is where exactly in the code-tree?) and flash that program on the Thingy:91?

I mean, am I missing something something in this perspective?

Best regards,

Ivan