It might be the need to send "\r\n" as newline rather than println's "\n"? Maybe just use Serial.print and then append "\r\n" to the command?
"\r\n"
"\n"
Serial.print
@Gordon started
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It might be the need to send
"\r\n"
as newline rather than println's"\n"
? Maybe just useSerial.print
and then append"\r\n"
to the command?