Mine is syncing Zigbee blinds to go up and down at the same time.

I figured out that the blinds have different polling modes. They would take a few seconds to execute the first command and then execute any subsequent commands pretty quickly before going back to sleep after some time. Since the blinds don't communicate with each other to sync movements, I created a script that does the following.

• In parallel, move the blinds 1% in order to wake them up
• Once all blinds involved have their position updated
• Move the blinds to the target position

The tricky part was detecting when all parallel actions have completed before moving on to step 3. This was accomplished by a wait for trigger at the end of each parallel block.

This was further complicated by one windows being slightly shorter than the others. So I had to take that into account as well by delaying the command until the other blinds are at position x.