Garage doors open on power failure

[barneyferd]

I'd like to begin by saying thank you for your work on this app for using the Zooz Zen16 as a garage door controller. It is a far better solution than the MyQ system I had been using for several years, and I am thankful for people like you that publish these kinds of solutions for the larger community.

That said, while on vacation this past week, we experienced a situation where our garage doors opened when power was restored after an outage caused by a lightning storm. Thankfully, my neighbors noticed the doors were open (happened late one evening, on the first day of our week long vacation), and texted us to let us know. Unfortunately, the multirelay was in some kind of state that then prevented the openers from responding to either the wall switches or the remote key pad. My neighbors had to disconnect the doors from the openers to manually close them. Upon returning home today, I found that manually cycling the relays on and off restored the control capability.

After experimenting today, it seems that the default state of the parameter "On/Off Status Recovery After Power Failure" which is "Restore Relay States From Before Power Failure" does not work as it describes. The normal state of the relay is 'Off', only toggling 'On' momentarily to trigger an open or close event. My relay was most certainly in the off state when the power went out, so I would have assumed it would resume function in the off state. However, when I unplugged the power to the relay, then plugged it back in, I found that both of my doors opened. This suggests that the relays actually toggle on then off when power is interrupted and then restored.

After changing this parameter to be "Turn All Relays Off", the power interruption no longer triggered the doors to open. Not sure if the app or driver can be updated to override this parameter, or if instructions just need to be provided to users to change that setting. But as the instructions are currently written, step 5 says "Do NOT change any of the advanced setting from the MultiRelay (even the switch input type)." My experience would suggest this is not correct, that it opens a security vulnerability for the user that is highly undesirable.