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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
user79451
Yes, it should definitely be possible. D28/29 are the default UART pins (espruino will use them for the console if they are connected to a UART at power on) but actually you can use any pins on the Puck for it.
There isn't currently a library for SMS messaging via AT commands, but there are a few posts on the forum showing what commands to send - and I'm open to making a library for it because I think it'd be pretty useful.
And yes - at least on SIM800 there's a pin for power on/power off - so Puck.js could use that to turn GSM on or off (in fact I think sometimes it can even be done with a serial command)