rpict-mqtt-bridge

This is a very simple functional, untested and "as-is" public domain implementation of an MQTT bridge reading Lechacals RPICT Raspberry Pi hats. Written in Golang, for portability and speed.

My personal setup has a "RPICT3V4v5" main hat, measuring the 3 phase voltages, then 4 extra hats all "RPICT8v5", measuring currents.

I use this from the Raspberry Pi running raspbian, broadcasting to a Home Assistant server running an MQTT broker.

If you have awesome suggestions, please open up an issue, or even better: a pull request. This project is low priority for me though: "if it works, it works" (so forking might be the better option, lol).

Usage

You can start the service with go run service.go. I recommend running it in a GNU screen. This project supports Home Assistant MQTT auto discovery and will broadcast discovery message every 60 seconds.

Config

The ordering of the channels section is important, this is the same order as the serial output of RPICT is parsed.

My current RPICT config is also in this repo, this might help you relate this bridge's config to the RPICT config.

{
    "Rpict": {
        "Device": "/dev/ttyAMA0",      // Where can we find the serial socket for RPICT
        "Baudrate": 38400              // Baudrate to use
    },
    "MqttBroker": {
        "Host": "<hostname>",          // Where can we find the MQTT broker
        "Port": 1337,
        "Path": "RPICT",               // Path to use for broadcasting all channels / measuremnts
        "User": "<mqtt_user>",         // Mqtt broker authentication
        "Password": "<mqtt_password>"
    },
    "Channels": [
        // Measurement is a Home Assistant sensor device class: https://www.home-assistant.io/integrations/sensor/
        { "Phases": 3, "Measurement": "voltage", "Description": "Net voltages", "Topic": "mains_voltage" },
        { "Phases": 3, "Measurement": "frequency", "Description": "Net frequenties", "Topic": "mains_frequency" },
        { "Phases": 3, "Measurement": "power", "Description": "Zonnepanelen", "Topic": "pv" },
        { "Phases": 3, "Measurement": "power", "Description": "Schuur", "Topic": "shed" },
        { "Phases": 3, "Measurement": "power", "Description": "Laadpaal", "Topic": "carcharger" },
        { "Phases": 1, "Measurement": "power", "Description": "Groep L1.4", "Topic": "GL1_4" },
        { "Phases": 1, "Measurement": "power", "Description": "Groep L1.5", "Topic": "GL1_5" },
        { "Phases": 1, "Measurement": "power", "Description": "Groep L1.6", "Topic": "GL1_6" },
        { "Phases": 1, "Measurement": "power", "Description": "Groep L2.1", "Topic": "GL2_1" },
        { "Phases": 1, "Measurement": "power", "Description": "Groep L2.2", "Topic": "GL2_2" },
        { "Phases": 1, "Measurement": "power", "Description": "Groep L2.3", "Topic": "GL2_3" },
        { "Phases": 1, "Measurement": "power", "Description": "Groep L3.5", "Topic": "GL3_5" },
        { "Phases": 1, "Measurement": "power", "Description": "Groep L3.6", "Topic": "GL3_6" },
        { "Phases": 1, "Measurement": "current", "Description": "Net aarde", "Topic": "mains_ground" }
    ]
}