Support for Ubisys C4

I want to add support for the quad push-button controller C4 by Ubisys. This is what I found out so far:

{
        zigbeeModel: ['C4 (5504)'],
        model: 'C4',
        vendor: 'Ubisys',
        description: 'Quad button C4',
        supports: 'four push buttons',

        fromZigbee: [???],
}

The device gets successfully paired to zigbee2mqtt, but does not seem to send any messages. As far as I remember from working with another coordinator (Dresden Raspbee / Deconz) I needed to set a group for each of the buttons in order to make them work. Most probably we will need to configure the device before it sends button push events.

A detailled tech reference document can be found here: https://www.ubisys.de/wp-content/uploads/ubisys-c4-technical-reference-1.pdf

Unfortunetely, my Zigbee knowledge ends right here. But I can test all suggestions you make.

[felixstorm]

@theFork working on it (https://github.com/felixstorm/zigbee-shepherd-converters/commit/ab25788ab12781784af17b40b9a9a4aaff0d1b9b) - binding to the coordinator does seem to work. will hopefully be able to have initial support ready within the next 3 days or 1 to 2 weeks, need to work on the InputActions attribute now to make buttons configurable…

[felixstorm]

Some more information on the C4 endpoints: There are 4 available with on/off, level and scenes (1-4, for lights) and 2 for window coverings (5-6).
You only need to use the number of endpoints corresponding to the number of different client devices you want to control, e.g. if you control two lights from input 1 and 2 and one window cover from inputs 3 (move up) and 4 (move down), you would use and bind endpoints 1 and 2 to your bulbs and endpoint 5 to your window cover. Then you need to configure your inputs to act on the corresponding endpoints and you should be good to go.