I believe there is a great future for self powered devices. No more batteries. I found EnOcean manufacturing self powered Zigbee devices with Hue support. Niko for example is using the EnOcean device in their switch.
Find here a link to these EnOcean Zigbee devices: https://www.enocean.com/en/products/enocean_modules_24ghz/
The EnOcean device used by Niko is the PTM 216Z. The user manual is downloadable using the link above. I tried to use and connect this switch but I can’t get it connected and as such it stops me to continue working on this device. Where and what is going wrong?