Unable to connect to Thingy:91 with at_client using Link Monitor

[mdjarv]

I have flashed my Thingy:91 via the nRF9160 DK using the Programmer with the pre-built at_client software, but I am unable to get any AT response when I connect using the Link Monitor.

The Thingy:91 is connected with both the programming cable as well as the USB cable, and I connect directly to it via its COM ports (doesn't make a difference if I have "Auto device/port filter" selected or not). Nothing comes out in the black log window, and if I try to send AT it just times out.

The switch on the device is set to nRF91, and I have tried this on both Windows and Linux with the same result.

I have also tried to install my own built software that I have previously tested on the DK but I can not get any debug logging in the Link Monitor for that software either on the Thingy:91

[Didrik Rokhaug]

First, could have you tried a different USB port/computer?

If that did not help, could you try to update to NCS v1.1.0?

cd ncs/nrf
git checkout v1.1.0
west update

Build and flash the nrf/samples/usb/usb_uart_bridge sample for the nrf52840_pca20035 board, and flash it to the nRF52 on the Thingy (remember to set the "SWD select" switch to "nRF52)?

[Didrik Rokhaug]

Hi.

Have you been able to solve your problem?

Best regards,

Didrik

[mdjarv]

I flashed the usb_uart_bridge to the nRF52 which seem to have made it work better. I still get random lockups but less if I first turn off the DK that I am flashing from before connecting the Link Monitor.

I have not yet had proper time to work on this yet but I've gotten far enough to be able to add new certificates to the modem so I will mark your suggestion as the answer