Ikea Tradfri Button

[sdirkwinkel]

The Ikea Tradfri button usually enters a zigbee group with the lamps it's controlling.
I'd like to use the button for other purposes with the zigbee2mqtt project.

In Koenkk/zigbee2mqtt#102 adding an empty group with just the button and controller was proposed, but no way to implement this was found.
How can this be accomplished using zigbee-bridge (zigbee-shepard)? I've found the bind method on endpoints but nothing similar to add a controller. Do i have to use a zApp with mount()?

[zephyrus]

Should be possible to be accomplished by https://open-zigbee.github.io/zigbee-bridge/API.html#bindcid-dsteporgrpid-callback, but need verification with real devices. These scenarios are not tested yet.