Linux - Screen Control

Proven on:

12 (bookworm)

As always...

Start with:

sudo apt install vbetool The following script needs to run as root... sudo vi /usr/local/bin/screenremote.py #!/usr/bin/env python import paho.mqtt.client as mqttClient import time import os import subprocess import socket ################################################################################################### hostname = socket.gethostname() broker_address = "skynet" port = 1883 topic = hostname + "/#" user = "user" password = "password" client = mqttClient.Client(hostname + "control") client.username_pw_set(user, password=password) ################################################################################################### ## Broker Connection ## ################################################################################################### Connected = False def on_connect(client, userdata, flags, rc): global Connected if rc == 0: print(" HostName: ", hostname) print("Connected to broker: ", broker_address) print(" Subscribed to: ", topic) print() Connected =True else: print("Connection failed") Connected =False ################################################################################################### ## Message Handling ## ################################################################################################### def on_message(client, userdata, message): print( " Received message: " + str(message.payload.decode("utf-8"))) print( " on topic: " + message.topic) #print( " with QoS: " + str(message.qos)) time.sleep(1) ### Display control (turn the screen on or off...) if message.topic == hostname + "/display": command = "/usr/sbin/vbetool dpms " + str(message.payload.decode("utf-8")) print( command ) os.system(command) ### Audio control (something for th future...) elif message.topic == hostname + "/audio": print("audio stuff") ### Not any sort of valid topic... else: print("Not Important to us...") print() ################################################################################################### client.on_connect = on_connect client.on_message = on_message client.connect(broker_address, port=port) client.loop_start() while Connected != True: time.sleep(0.1) client.subscribe(topic) try: while True: time.sleep(1) except KeyboardInterrupt: print( "exiting" ) client.disconnect() client.loop_stop() sudo chmod +x /usr/local/bin/screenremote.py This will respond to MQTT messages: HOSTNAME/display on HOSTNAME/display off & works as a systemd service sudo vi /etc/systemd/system/remote-screen-control.service [Unit] Description=Watch for MQTT messages to turn screen on/off After=multi-user.target [Service] ExecStart=/usr/local/bin/screenremote.py Type=simple [Install] WantedBy=multi-user.target sudo systemctl enable remote-screen-control.service sudo systemctl start remote-screen-control.service sudo systemctl status remote-screen-control.service