From Hentschel
/* Installed bindings and Node-RED modules */
# Amazon Echo voice control
Essential mapping between Apple HomeKIt and OpenHAB2 is done via the Node-RED .js homebridge-openhab2 plugin (https://www.npmjs.com/package/homebridge-openhab2). This will map any OpenHAB2 ''Items'' decorated in the .items files into the HomeKIT space. The HomeBridge setup is essential since HomeKit can only deal with 99 accessories. Since HomeBridge is a bridge, it only counts as one.
Additional mappings of devices that have troubles with OpenHAB + HomeKit bridge can be added as separate HomeKit devices in Node-RED and hitched up to OpenHAB via the ''node-red-contrib-homekit'' plugin. To install, first look here: https://www.npmjs.com/package/node-red-contrib-homekit . However, the install needs a small modification, basically run: