trying to bind one zigbee ZBM5 smart switch to another for 2-way switching of a light

[moraysan]

Hi, really hope someone can help me here. I am replacing 2 dumb switches with smart switches to control a single light on an upstairs landing. The ZBM5-2C switch upstairs is wired normally to the light and I have a cable running downstairs to a ZBM5-1C smart switch just to provide it live and neutral. This wire used to be the traveller wire for the dumb switch downstairs. I believe that I can bind the two switches together so that they can work together even if HA or Z2M is offline. I tried this from the Z2M frontend by carrying out the following...

1. select the switch that only has power supplied to it
2. go to the bind tab
3. under source endpoint 1, I chose "Add"
4. select the upstairs switch as the destination
5. chose "1" as the destination endpoint (NOTE: also tried with "2", when I tried with 242, L1 or L2 I could not even see any clusters available so I was unable to bind with anything other than 1 or 2)
6. chose "genOnOff " under clusters
7. select "Bind"
8. Z2M reported "z2m: Successfully bound cluster 'genOnOff' from 'Bottom of stairs switch' to 'top of stairs switch'"
9. when I press the downstairs switch, nothing happens.

The upstairs switch operates the light as expected when used on its own. I have updated both switches firmware to the latest available.
Any help would be greatly appreciated. If you need more information, please let me know.

[andrei-lazarov]

Yes definitely!

• ZBM5 supports binding as of v1.0.6 - make sure your have this or higher
• Binding is effective only if detached mode is enabled (SONOFF quirk)
  • Same behavior as ZBMINIR2 (read here for more info)
  • You can 'fake' attached mode, by binding the switch to itself

Bind each switch to each other, so their states stay in sync (and indicators probably):

1. Enable detached mode on both switches
2. Bind switch 1 to switch 2
3. Bind switch 1 to switch 1
4. Bind switch 2 to switch 1
5. Bind switch 2 to switch 2
6. In your dashboard, use a group to toggle both at the same time

[moraysan]

Andrei, you're a rockstar! A little convoluted, but it works like a charm.