HDMI-CEC REST Server

A very simplistic REST API to wake up or shutdown the monitor using HDMI CEC

Requires cec-utils (sudo apt get install cec-utils)

Example of usage:
curl -X POST http://<target_ip>:8181/screen/on wakes up the monitor on the target device
curl -X POST http://<target_ip>:8181/screen/off shuts down the monitor on the target device

More advanced example using presence detection under Home Assistant:
Note: This example is based uppon Occupancy attribute of an IKEA E1525/E1745 motion sensor connected directly as a zigbee device using Zigbee2MQTT (without IKEA gateway). This kind of sensor is very easy to use, very reliable and offers its own timer set to 3 minute (3 minutes between the last motion detection and occupancy attribute to become false). This example assumes the hdmi_rest_server is already running on the target.

1. Modify the Home Assistant principal configuration.yaml file. Add the following to the bottom of the file (or append an exisitng rest_command section):

rest_command:
  remotedevice_hdmi_on:
    url: "http://<target_ip>:8181/screen/on"
    method: POST
    headers:
      accept: "application/json, text/html"
      user-agent: "HAOS"
    verify_ssl: false
  remotedevice_hdmi_off:
    url: "http://<target_ip>:8181/screen/off"
    method: POST
    headers:
      accept: "application/json, text/html"
      user-agent: "HAOS"
    verify_ssl: false

2. Save and validate the configuration.yaml file uder developer-tools of Home Assistant then reboot.
3. Create the "ON" automation:

• Set the trigger to "occupancy becomes occupied" attribute of your motion sensor
• Set the action to rest_command.magicmirror_hdmi_on

4. Create the "OFF" automation:

• Set the trigger to "occupancy becomes unoccupied" attribute of your motion sensor
• Set the action to rest_command.magicmirror_hdmi_off

5. That's it ! The monitor of your target should wake up upon motion detection and shut down after 3mn of no motion detection.