To start off, you’ll want to have Home Assistant running on a local server or Raspberry Pi and a Zigbee USB dongle, like the Conbee II or SkyConnect. If you’ve never worked with Home Assistant, their Getting Started guide is pretty comprehensive.
I’ll mention that there’s also a whole bunch of other Zigbee gateways out there that work similar to the Hue Bridge, but these could all eventually share the same fate as Hue, if they aren’t already forced to be online.
To start off, you’ll want to have Home Assistant running on a local server or Raspberry Pi and a Zigbee USB dongle, like the Conbee II or SkyConnect. If you’ve never worked with Home Assistant, their Getting Started guide is pretty comprehensive.
To migrate the apps off the Hue gateway, there’s a section describing various methods to do so in the Home Assistant Zigbee guide.
I’ll mention that there’s also a whole bunch of other Zigbee gateways out there that work similar to the Hue Bridge, but these could all eventually share the same fate as Hue, if they aren’t already forced to be online.