Can be used to trigger a motion detected event when a switch is turned on, via Siri for example, similar to https://twitter.com/viticci/status/961751917973180417 but within HomeKit only.
npm install -g homebridge-motion-switch
And add the following to the accessories list in your Homebridge config. Change names as you wish.
{
"accessory": "Motion Switch",
"motion_sensor_name": "Motion Sensor",
"switch_name": "Motion Switch",
"name": "Motion Switch"
}
Then add it to HomeKit, once added, you will need to turn on Notifications for the motion sensor you just added.