NRF9160 Not Appearing in LTE Link Monitor as a Connectable Device

RE: NRF9160 Not Appearing in LTE Link Monitor as a Connectable Device

George.Selsing — Fri, 26 Aug 2022 17:34:38 GMT

That led me in the right direction! The Jlink only had the SWO/SWDIO/SWCLK pins connected to the NRF9160. Turns out the LTE Link Monitor wants to talk through the Rx Tx UART line, which I soldered some wires to on the board and ran through serial->UART cable. After that I was able to see the device in the LTE Link Monitor and send AT Commands. Thanks for the push in the right direction, I guess my peers forgot about having to break out the Rx and Tx but when I showed them they remembered that that is what they also did.

Thanks again!

RE: NRF9160 Not Appearing in LTE Link Monitor as a Connectable Device

Einarh — Fri, 26 Aug 2022 08:08:10 GMT

Hello!

I believe the LTE Link Monitor uses a virtual COM port to communicate with the nRF9160, and I notice that only RTT is detected in your VSCode screenshot.

So I suspect your issue might be caused by talking to the nRF9160 through a Jlink debugger.

Did your peers two months ago use exactly the same setup?

Best regards,

Einar

RE: NRF9160 Not Appearing in LTE Link Monitor as a Connectable Device

George.Selsing — Thu, 25 Aug 2022 22:22:47 GMT

Just uninstalled NRF Connect and the LTE Link Monitor. Reinstalled NRF Connect 3.7.1 and the 3.7 compatible LTE Link Monitor. Sadly the device still does not show up there. However it does still show up in the 3.7 compatible version of the programmer App so I don't think it's the version.

RE: NRF9160 Not Appearing in LTE Link Monitor as a Connectable Device

rajeev — Thu, 25 Aug 2022 22:03:59 GMT

hmm OK, that I am not sure why.

At least the device should have shown up.
Try to uninstall and reinstall the LTE link monitor or try an older version of the link monitor.

I have found sometimes newer versions have some glitches

RE: NRF9160 Not Appearing in LTE Link Monitor as a Connectable Device

George.Selsing — Thu, 25 Aug 2022 22:00:38 GMT

I'm still confused how the device is able to be recognized by NRF Connect and appear as a connectable device in the Programmer, but does not show up in the LTE Link Monitor.

RE: NRF9160 Not Appearing in LTE Link Monitor as a Connectable Device

rajeev — Thu, 25 Aug 2022 21:56:21 GMT

Nordic Dev kits including Thingy series have vendor FTDI IDs preconfigured by Nordic (factory default) and also as VendorId.NORDIC_SEMICONDUCTOR in their programmer software and that is how the SW is able to recognize and connect directly.

Since you have a custom board although it has nRF9160, the programmer will display the device but it is not going to allow direct programming. Here all the communication to the nRF will have to go through the JLink device that you have and it will then program the nRF.

The same will apply when you use the nRF530 DK and connect your custom nRF91 via the SWD pins. Sw will recognize the nRF53-DK and program your device via SWD ports.

Hope that makes sense.