Thingy52 J-Link serial console


I have some Thingy52 here and I would like to use them for a reasonable application. I connected the J-Link to the Thingy52 and I am able to flash it. My problem is just: How to connect it to the serial console over the J-Link? I am not familiar with it. I just get the following response:

J-Link connection not established yet but required for command. Connecting to J-Link via USB...No handlers could be found for logger "root" 2019-04-06 21:52:44,120 - WARNING # Host name for TCP connection is missing, defaulting to "localhost" 2019-04-06 21:52:44,120 - INFO # Connect to localhost:19021 2019-04-06 21:52:44,120 - ERROR # Something went wrong connecting to localhost:19021

I soldered the pin header, connected a UART-to-USB adapter to it and used the nrf52dk board to flash it. That works fine. But it probably is better to just use the J-Link. So, I would like to know how to do this.