Use CAN bus instead of WiFi to connect ESPHome based devices to HASS via MQTT.
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The scope of the project is to implement a custom ESP transport which would allow ESP Home to talk through CAN BUS and a CAN 2 MQTT bridge which would talk to custom ESP transport and route message to and from the MQTT server.
Here is my fancy test setup:
1) Simple USB to CAN dongle
2) A couple of ESP32c3 minis linked to SN65HVD230 CAN transceivers
mqtt_over_can.mp4Quick demoMPEG-4 Video - 15.28 MB - 04/30/2025 at 19:03 |
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Uploaded a short demo video that illustrates how things work. Note that as I power up a device it shows up in Home Assistant and then I can control the ESP onboard LED via the Home Assistant UI.
POC is ready and seems to be working with 2 devices. Here is a link to the github repo: https://github.com/hello42world/mqttovercan
hello42world
The Hat
aggiezach
tdicola
Roman V