What's the difference between learning an ethernet protocol or learning an IR code? HAI is already capable of talking to a RFX, there also is a non Philips iPronto app. There is nothing on sale here, just information about a protocol. It's not ment for building and selling an own extender (however there is and has been the freeware Prontonic for years without a problem), but to be capable to use one. They even use public protocols like UDP and SSDP without encryption or MAC checking.

Anyway, if the prontoteam or remotecentral have a problem with it they know how to contact me.

Back on topic:
When the Pronto first connects (or didn't send something for a longer time) it's send 00 (probably to check if the extender is there), then a part I can't figure out in my case 30 00 00 1A 00 00 75 30 and then the ProjectName from the CF.

The extender replies twice on everything. First 20 then 40, probably the first to ack the command and the second to confirm it's executed or that it's ready for more.