Build and download Asset Tracker but doesn't work - help!

[jmallett]

I recently purchased a Thingy:91.  Initially it would not connect to the local network.  I purchased a a J-Link programmer and via the nRF Connect Programmer updated the modem firmware and certificates.  Downloaded the latest compiled firmware (thingy91_ltem_2019-11-29_d3130d77.hex - 959kb) and after programming the Thingy:91 got it working and connecting to the network.  Now I can see the data via nrfcloud.com.

I want to modify the Asset Tracker firmware to add my own functionality.  So I downloaded from the repository (https://github.com/NordicPlayground/fw-nrfconnect-nrf) and also got Segger SES environment setup.  It was quite the job getting everything downloaded and configured.  I can compile and build the Asset Tracker project without errors.

The issue I'm having now is identifying the hex file and downloading to the Thingy:91.  I believe it's the Merged.hex that I need to use, however it's a bit smaller than the complied firmware above.  When I build and download the Thingy:91 is unresponsive (red light).  What am I missing here...?

Thanks if you can help!

[jmallett]

Thanks again Martin - I did miss that.

Ok so here are my settings to confirm:

I did build the solution and download however still not working - no flashing lights or activity.  The merged.hex is now 710kb, still much smaller than the pre-compiled examples.

[Martin Lesund]

Hi James,

What NCS version are you on?

Could you please try to upgrade to the master branch?

cd ncs/nrf
git checkout master
git pull
west update

Then delete the build folder for the asset_tracker sample, and re-build with SES. 

Then try to flash via SES. 

If nothing is happening, please connect a USB to Thingy:91 and open LTE Link Monitor and uncheck: [Automatic requests, Auto device/port filter]

Then select the correct port:

Then you should get out some serial output from the application.

---

Please try via command line (nrfjprog) if SES is not working.

I can confirm that the pre-compiled FW is a bit bigger than the one that you build yourself.

Best regards,

Martin L.

[jmallett]

Thank you so much Martin.

After typing 'git checkout master' I had this error: "Your local changes to the following files would be overwritten by merge .. Please, commit your changes or stash them before you can merge".

So I discarded the local changes by doing this:

1. git reset --hard
2. git checkout master
3. git pull
4. west update

Built the project and flashed the target Thingy:91 with merged.hex (now 781kb) and it works!

Thanks so much for providing help, I very much appreciate it!

James