GPRS or Edge Howto?

Maybe take a look in the socks array and check that the socket's state isn't wait or something. Also check sockData array to see if the data is getting sent in there.

If the ipdHandler/receiveHandler is working ok the the data should all go into sockData, and the recv function is then responsible for giving that to Espruino.

If you changed the text in ipdHandler, dod you change line.substring(5,colon) to line.substring(9,colon) as well? That could be important...