Dig into the RFC's and read the Vogon poetry for a while?
Quite likely...
Or you could actually connect via some device that uses SLIP and capture the packets?
My worry is that it may actually be sending data at the packet level, which would mean that you'd need TCP/IP on the Espruino (which isn't there at the moment)
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.
Quite likely...
Or you could actually connect via some device that uses SLIP and capture the packets?
My worry is that it may actually be sending data at the packet level, which would mean that you'd need TCP/IP on the Espruino (which isn't there at the moment)