Sending AT commands over RTT

Hi,
does anyone know how to send AT commands to nrf9160 SoC over RTT?
 
I found that it can be done, but I don't understand how exactly I can send AT commands over the RTT. This is a response:

"Hi,

You can use the modem_shell sample, with the rtt overlay config file.

Note that you cannot send "raw" AT commands out of the box, as it presents a shell. Instead you must use the "at" shell command to send one and one command, or to enter "at_cmd_mode".

Best regards,

Didrik

"
I flashed modem_ shell sample on my custom board, what is the next step?

Unfortunatelly I didn't predicted USART communication in my custom board, so only RTT is option to check where is the problem.

Best regards

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