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Open and cheap DIY IP-KVM based on Raspberry Pi
Open and inexpensive DIY IP-KVM based on Raspberry Pi
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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esphome
ESPHome is a system to control your ESP8266/ESP32 by simple yet powerful configuration files and control them remotely through Home Automation systems.
You can do this with a $30 Sonoff S31 running ESPHome [0]. Since the Sonoff wall switch can run a ping sensor against your server you could create a watchdog automation right on the S31 to shut off the mains power to the S31 switch and turn back on after X seconds.
There are other ways you could have the S31 do operational checks but ultimately ESPHome is probably an interesting consideration and supported by tons of off the shelf hardware.
[0] https://esphome.io/
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I have HACS[0] installed in my Docker image, I use it for exactly one integration and the initial setup seemed a little dodgy but it's been pain-free for a couple of years now.
[0]: https://hacs.xyz/
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For Zigbee, I can recommend using the Zigbee2MQTT (https://www.zigbee2mqtt.io/) integration instead of HomeAssistant's built-in ZHA system. It might be a bit more complex to set up, but it's very powerful and works fantastically. (User "simon42" on YouTube has some good videos about the topic, but they're in German.)