Just to let you know, the binding made it into the official openhab source tree, the ticket to add the support is close and openhab now officially supports resol solar controllers (ok, starting from the next Milestone build for 3.1 M4).
Thanks for all the feedback I received here and all your patience to get this one done. Stay tuned, and please report bugs from now on directly in the issue tracker of the openhab-addons repository.