Hmm, I see what you’re saying but, when it comes down to it opengarage needs to do something to make sure it only opens when the user wants it to. There shouldn’t need to be special settings or special flags or anything else special on the broker or client to make sure this issue doesn’t happen. Having the garage door open without the user wanting it to is the absolute worst thing that could possibly happen when using a garage door opener product.
I don’t know how the opengarage client works or what options are available when connecting to the broker but, I would assume there’s some way to say connect disregarding all messages, then start processing new messages. Or at least something along those lines.