I already thought on something like that. I even took a look to Wiresharks dissector.
Besides the 'time' problem, I just see another problem... the dissector addresses packet types and packet structures, but says nothing about protocol's state machine, am I right?
Do you know we're could I get information on that topic? Is there a public SINEC H1 protocol specification? I guess that if it's not too complicated I could reverse engineer it using Wireshark. But I'd prefer a good document instead