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.
AT+CMGS="+467000000"
i got the response ok upon sending
AT+CNMI=2,2
But after sending the message and entering ctrl+z i got the reply "error"
i am using post paid does it have any impact? and when i use at+cops=? i got reply error instead of service provider name