I am using Arduino UNO in combination with M5 STACK + SIM 7020G(NB IOT). I am trying to send a message using Arduino serial monitor and have a trouble in ending the message. Ctrl+z is not working on serial monitor. I tried ending the messages in several ways but nothing works except using "" and it returns error. In the below example after entering hello, i tried couple of times pressing ctrl+z or esc, nothing works.