Here,
this guy has a solution. But its an ugly solution: requires an android device (a cheap set-top box) with e-control, as a bridge, and then his software will control the android device to control RM PRO. Kind of, too complicated, therefore not too reliable.
I can see two approaches to this:
1. To use wireshark, as it was suggested, to analyze the packets sent to RM Pro and, based on this, to write a PC software that will send such packets.
Cons: may require quite a lot of time and effort
2. To build an Arduino-based device with the same functionality as RM-pro. This can be even cheaper than RM Pro and, using ready-made libraries for RC-2 and 433MHz RF modules, might require even less effort than method #1.
Cons: This will only be controllable from PC or from any browser, there will be no native application for iOS/Android, unless someone is willing to develop one.
I feel more inclined and interested in method #2, but I am not sure I will find time in the near future