The problem is that the API for the RFX is not exposed. There is no documentation on how to talk to it. That is why I went a different route and use a Global cache and do all my IR through it over TCPIP. An advantage is that both homeseer and the Pronto could talk to the Global Cache. At the request of a user I built a Homeseer plugin that talks to the Pronto PAL which deals with the Global cache on behalf of the Pronto.

He was using the PAL to do his IR with a Global cache, and wanted to do just what you are trying to do so he is now doing it.