I was going to going to use Telegram for that very same purpose and stopped at the same point. They wanted to charge the Premium service just to get the OTP, and I had visions of never being able to cancel said service...or paying the amount and the OTP never coming through ( lots of reports of that on the interweb ).Thanks - I'll have a look, finally got in to telegram
Was trying set it up for our house sitter so she can control the alarm without struggling with the remotes and the bloody thing now wants you to sign up for SMS Premium to get an OTP.
How did you circumvent that ?