Automatically Starting zigbee2mqtt Systemd Service: A Broken Plan Using Cron Job
Smart homes are becoming increasingly popular, and one of the essential components in building a smart home is a reliable and efficient home automation hub. Zigbee2mqtt is an open-source project that enables you to convert your Raspberry Pi into a Zigbee gateway and integrate it with various home automation platforms. While systemd services are the recommended way of starting zigbee2mqtt on boot, sometimes they may fail, and a broken plan using a cron job may be necessary.
What is zigbee2mqtt?
Zigbee2mqtt is a software project that converts your Raspberry Pi into a Zigbee gateway. It enables you to connect various Zigbee devices, such as smart bulbs, thermostats, and sensors, to your home automation platform. Zigbee2mqtt supports various home automation platforms, including Home Assistant, OpenHAB, and Node-RED. It uses the popular message queue telemetry transport (MQTT) protocol to communicate between the Zigbee devices and the home automation platform. Zigbee2mqtt is an open-source project, and its source code is available on GitHub.
Systemd Services
Systemd services are a standard way of starting and managing system processes on Linux distributions. Systemd services allow you to start, stop, and restart system processes automatically on boot or on demand. While systemd services are a reliable way of starting zigbee2mqtt, sometimes they may fail due to various reasons, such as dependency issues, file permissions, and system updates.
Broken Plan: Using Cron Job
If the systemd service is not working as expected, a broken plan using a cron job may be necessary. A cron job is a time-based job scheduler on Unix-like operating systems. You can use a cron job to schedule a command or script to run automatically at a specific time or interval. In this case, you can use a cron job to start zigbee2mqtt automatically on reboot.
Creating a Cron Job
To create a cron job that starts zigbee2mqtt automatically on reboot, you need to follow these steps:
- Create a script that starts zigbee2mqtt using the screen command. The screen command enables you to run a command in a separate terminal window. This way, you can detach the terminal window and leave zigbee2mqtt running in the background.
- Save the script in a location accessible by the system’s PATH environment variable. For example, you can save the script in the /home/rwb/bin directory.
- Make the script executable by changing its file permissions using the chmod command.
- Edit the crontab file using the crontab command.
- Add a new entry to the crontab file that runs the script on reboot.
Script Example
Here is an example of a script that starts zigbee2mqtt using the screen command:
#!/bin/bash
# Start zigbee2mqtt using screen command
cd /opt/zigbee2mqtt
screen -dmS zigbee2mqtt ./zigbee2mqtt -d
In the script, you first navigate to the zigbee2mqtt installation directory, then start the zigbee2mqtt process using the screen command. The -d flag detaches the terminal window, leaving zigbee2mqtt running in the background.
Cron Job Example
Here is an example of a cron job that runs the script on reboot:
@reboot /home/rwb/bin/zigbee2mqtt-screen.sh
In the cron job, you use the @reboot directive to run the script on reboot. The script path is the location where you saved the script in step 2.
Zigbee2mqtt is an open-source project that enables you to convert your Raspberry Pi into a Zigbee gateway. While systemd services are the recommended way of starting zigbee2mqtt on boot, sometimes they may fail due to various reasons. In such cases, a broken plan using a cron job may