Kamstrup Multical MQTT

MQTT client/parser for Kamstrup Multical family of heat/energy meters.

• Tested with Kamstrup Multical 303 (in active heating system)
• Tested with Kamstrup Multical 601 (not mounted in heating system, 0 flow, 0 power)
• Not all registers are implemented (eg the MAX value registers are ignored)
• Supports multiple Kamstrup meters on one single MBUS (Meterbus)
• Note: MBUS/Meterbus is not the same as MODBUS; You do need a MBUS adapter, MODBUS adapter will not work
• Timestamps (used for influxdb) are generated with 1sec accuracy
• All connected meters are read in a single sequential burst

Coding:

• MQTT JSON key coding: d=device; t=tarif (used in Multical 601)

Usage:

• Copy systemd/kamstrup-mqtt.service to /etc/systemd/system
• Adapt path in kamstrup-mqtt.service to your install location (default: /opt/iot/kamstrup)
• Copy config.rename.py to config.py and adapt for your configuration (minimal: mqtt ip, username, password)
• sudo systemctl enable kamstrup-mqtt
• sudo systemctl start kamstrup-mqtt

Use http://mqtt-explorer.com/ to test & inspect MQTT messages

Requirements

• paho-mqtt
• meterbus
• pyserial
• python 3.x

Tested under Linux; there is no reason why it does not work under Windows.

InfluxDB

• Use telegraf-kamstrup-powermeters.conf as Telegraf configuration file to get kamstrup MQTT data into InfluxDB

Licence

GPL v3

Versions

1.0.0

• Initial version