Work out method of comms with Xadow - options include i2c (though this involves setting it up both on Xadow but also on LPC812) or some how tapping in to the header and pulling out the UART
Get simple passing of data from LPC812 to Xadow and then GSM messaging that home
Next is getting data via GPRS (there is an HTTPS function)
Then add extra features (charging data etc)
Pseudo Code
function send_gsm_message()
gsm.text(phone_number, "Hi I'm Alive")
end
id = timer.create(10000,send_gsm_message)