Code structure:

setup {
	set sotfware serial with GSM
	set hardware serial with GPS
	set button interrupt
}

loop {
	listen for sms commands
	setting emergency number
}

on_activation {
	enable recording pin
	loop (arbitrary time) {
		get gps coordinates
		send with sms
	}
}

# Todo
Test button interrupt sending message
Test GPS fix
Test GPS fix on button interrupt
Combine both