I guess the obvious thing might be to use the Bluetooth HID functionality to emulate a keyboard and send keypresses for a gesture? This is already done in https://banglejs.com/apps/#hidkbd as well.
I'd have thought there would be a way to do something with IFTTT when a key is pressed on the phone?
Otherwise if you have an old phone that you can just leave around then you could use this code: http://www.espruino.com/BLE+IFTTT
There are even other Bluetooth options now as well (involving scanning) that don't even require an active connection
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