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How do I get output (print functions) from app running on Thingy:91 that is connected via cable to nrf9160 DK

Where do I get the output (from the main apps printf/printk etc) from the Thingy:91 once it's connected via 10-pin swd-cable to my nrf9160 DK?

I don't think there's anything wrong with the connections since I can progam the Thingy via the cable (flash the asset_tracker for example).

The output of the DK is streamed via /dev/ttyACM0 (i'm on Ubuntu 18.04) and the /dev/ttyACM1 prints the output from the nRF52. 
I'd assume that the external device output would be /dev/ttyACM2 (or perhaps ttyACM0 when connected).

Is there some configuration I need to do (baud rate on ttyACM*, app config or similar) to enable this?

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