venus-os_dbus-mqtt-temperature-x5 - Emulates up to 5 separate temperature sensors in VenusOS from info in MQTT data

First off, a big thanks to mr-manuel that created a bunch of templates that made this possible

GitHub repository: LundSoftwares/venus-os_dbus-mqtt-temperature-x5

Disclaimer

I'm not responsible for the usage of this script. Use on own risk!

Purpose

The script emulates up to 5 temperature sensors in Venus OS. It gets the MQTT data from a subscribed topic and publishes the information on the dbus as the service com.victronenergy.temperature.mqtt_temperature with the VRM instances from the Config file.

Config

Copy or rename the config.sample.ini to config.ini in the dbus-mqtt-temperature folder and change it as you need it.

Example: Set number of instances to create, then change custom name, VRM Instance and type for all Sensors

; Set number of Instances to create, 1 is minimum, 5 is maximum
; default: 1
instances = 1

;---------------------------------------------------------------------
; Device name #1
; default: MQTT Temperature
device_name = MQTT Temperature

; Device VRM instance #1
; default: 100
device_instance = 100

; Temperature type #1
; 0 = battery
; 1 = fridge
; 2 = generic
; default: 2
type = 2

JSON structure

Minimum required

{
"temperature": 22.0
}

Minimum required with humidity and pressure

{
    "temperature": 23,
    "humidity": 45,
    "pressure": 1002
}

Full

{
    "temperature": 23,
    "humidity": 45,
    "pressure": 1002,
    "temperature2": 20,
    "humidity2": 40,
    "pressure2": 1002,
    "temperature3": 26,
    "humidity3": 42,
    "pressure3": 1007,
    "temperature4": 15,
    "humidity4": 99,
    "pressur4": 1005,
    "temperature5": 4,
    "humidity5": 88,
    "pressure5": 1002
}

Install

1. Copy the dbus-mqtt-temperature folder to /data/etc on your Venus OS device

2. Run bash /data/etc/dbus-mqtt-temperature/install.sh as root

The daemon-tools should start this service automatically within seconds.

Uninstall

Run /data/etc/dbus-mqtt-temperature/uninstall.sh

Restart

Run /data/etc/dbus-mqtt-temperature/restart.sh

Debugging

The logs can be checked with tail -n 100 -F /data/log/dbus-mqtt-temperature/current | tai64nlocal

The service status can be checked with svstat: svstat /service/dbus-mqtt-temperature

This will output somethink like /service/dbus-mqtt-temperature: up (pid 5845) 185 seconds

If the seconds are under 5 then the service crashes and gets restarted all the time. If you do not see anything in the logs you can increase the log level in /data/etc/dbus-mqtt-temperature/dbus-mqtt-temperature.py by changing level=logging.WARNING to level=logging.INFO or level=logging.DEBUG

If the script stops with the message dbus.exceptions.NameExistsException: Bus name already exists: com.victronenergy.temperature.mqtt_temperature" it means that the service is still running or another service is using that bus name.

Compatibility

It was tested on Venus OS Large v3.01 on the following devices:

• RaspberryPi 3b+
• Simulated Temperature data sent from NodeRed

And on Venus OS Large v2.92 on the following devices:

• RaspberryPi 4
• Real Sensor data sent from NodeRed

NodeRed Example code

Import into NodeRed runing on your VenusOS device for some simple testing

[{"id":"df8b7f2fd88734d8","type":"mqtt out","z":"36b8e7c267cde307","name":"MQTT out","topic":"Temperature/Sensors","qos":"","retain":"","respTopic":"","contentType":"","userProps":"","correl":"","expiry":"","broker":"3cc159c0642d9663","x":720,"y":340,"wires":[]},{"id":"f845dc4f9a4ffa6e","type":"function","z":"36b8e7c267cde307","name":"function 2","func":"msg.payload=\n{\n    \"temperature\": 23,\n    \"humidity\": 45,\n    \"pressure\": 1002,\n    \"temperature2\": 20,\n    \"humidity2\": 40,\n    \"pressure2\": 1002,\n    \"temperature3\": 26,\n    \"humidity3\": 42,\n    \"pressure3\": 1007,\n    \"temperature4\": 15,\n    \"humidity4\": 99,\n    \"pressur4\": 1005,\n    \"temperature5\": 4,\n    \"humidity5\": 88,\n    \"pressure5\": 1002\n}\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":520,"y":340,"wires":[["df8b7f2fd88734d8"]]},{"id":"b6402e0e1f5a652f","type":"inject","z":"36b8e7c267cde307","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"30","crontab":"","once":true,"onceDelay":"1","topic":"","payload":"","payloadType":"date","x":350,"y":340,"wires":[["f845dc4f9a4ffa6e"]]},{"id":"3cc159c0642d9663","type":"mqtt-broker","name":"","broker":"localhost","port":"1883","clientid":"","autoConnect":true,"usetls":false,"protocolVersion":"4","keepalive":"60","cleansession":true,"birthTopic":"","birthQos":"0","birthPayload":"","birthMsg":{},"closeTopic":"","closeQos":"0","closePayload":"","closeMsg":{},"willTopic":"","willQos":"0","willPayload":"","willMsg":{},"userProps":"","sessionExpiry":""}]

Screenshots

Device List

Device Status

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