• Water meter with IZAR module (Diehl IZAR RC 868 I R4 PL), IZAR Radio Compact Hall is designed for mobile reading and fixed network remote reading of Diehl Metering meters.
  
• Supported DVB-T receiver or Nano CUL Adapter, Andoer Tragbarer Mini Digitaler TV Stock USB 2.0 DVB-T + DAB + FM + RTL2832U + FC0012 Chip Unterstützung SDR Stimmer Empfänger
  
• A computer. I’m using Raspbian Buster on a Raspberry Pi 3B+, but any Linux, macOS should work

You need install:

• rtl-sdr Turns your Realtek RTL2832 based DVB dongle into a SDR receiver https://osmocom.org/projects/rtl-sdr/wiki/Rtl-sdr
  

• rtl-wmbus Software defined receiver for Wireless-M-Bus with RTL-SDR. The Osmocom RTL-SDR library must be installed before you can build rtl-wmbus. https://github.com/xaelsouth/rtl-wmbus
  

• wmbusmeters Program receives and decodes WMBus telegrams https://github.com/weetmuts/wmbusmeters

Details and Installation see: wmbusmeters-with-rtl-sdr.md

NANO-CUL (mbus) 868 is a lot easier to use because it only requires wmbusmeters. The resources (memory) required are also less compared to the variant with RTL-SDR and rtl-wmbus.

Please not, that you do need the NANO-CUL (mbus) 868 Mhz for wmbusmeters not for ***\*FHEM\****!! . smart-home-komponente.net can flash the firmware for wmbusmeters.

Details and Installation see: wmbusmeters-with-rtl-sdr.md

wmbusmeters docker is able to detect attachment and removal of wmbus dongles and to provide that functionality within docker image it must be started in privileged mode to have access to hosts /dev/ content.

see: https://hub.docker.com/r/weetmuts/wmbusmeters

More Info see: Testcase Flash CUL-Stick

https://www.smart-home-komponente.de/nano-cul/nano-cul-868-extra/

• wmbusmeters Program receives and decodes WMBus telegrams https://github.com/weetmuts/wmbusmeters, build see: build-wmbusmeters

In the wmbusmeters reporting mode, data will be published to the MQTT broker topic "tele/wasser/verbrauch".

This data can be subscribed to and processed by other applications. From this point forward your options are endless. Example for simple mode - publish all smartmeter display data:

{
    "media": "water",
    "meter": "izar",
    "name": "watermeter",
    "id": "1231150",
    "total_m3": 166.625,
    "last_month_total_m3": 162.614,
    "last_month_measure_date": "2020-07-01",
    "remaining_battery_life_y": 13,
    "current_alarms": "no_alarm",
    "previous_alarms": "no_alarm",
    "timestamp": "2020-07-16T11:32:38Z"
}

A simple Linux python script to query arbitrary smartmeter water sensor devices and send the data to an MQTT broker, e.g., the famous Eclipse Mosquitto. After data made the hop to the MQTT broker it can be used by home automation software, like openHAB or Home Assistant.

On a modern Linux system just a few steps are needed to get the daemon working. The following example shows the installation under Debian/Raspbian below the /opt directory:

$ git clone https://github.com/zibous/ha-watermeter.git /opt/ha-watermeter
$ cd /opt/ha-watermeter
$ sudo pip3 install -r requirements.txt

To match personal needs, all operation details can be configured using the file config.py The file needs to be created first:

$ cd /opt/ha-watermeter
$ cp config.py.dist config.py
$ nano config.py

$ chmod +x app.py
$ python3 app.py  ## or ./app.py

You most probably want to execute the program continuously in the background. This can be done either by using the internal daemon or cron.

Attention: Daemon mode must be enabled in the configuration file (default).

1. Systemd service - on systemd powered systems the recommended option

   sudo cp /opt/ha-watermeter/service.template /etc/systemd/system/ha-watermeter.service
   
   sudo systemctl daemon-reload
   sudo systemctl start ha-watermeter.service
   sudo systemctl status ha-watermeter.service
   
   sudo systemctl enable ha-watermeter.service

Sensor setting see: smartmeter-watermeter.yaml

https://osmocom.org/projects/rtl-sdr/wiki/Rtl-sdr
https://github.com/xaelsouth/rtl-wmbus
https://github.com/weetmuts/wmbusmeters
https://github.com/ZeWaren/izar-prios-smart-meter-collector

## DVB-T receiver or Nano CUL Adapter
https://www.amazon.de/Tragbarer-Mini-Digitaler-TV-Stock-Unterst%C3%BCtzung-SDR-Stimmer-Empf%C3%A4nger/dp/B013Q94CT6/ref=sr_1_2?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&crid=3F9GCJKEPPNO7&dchild=1&keywords=dvbt+dongle&qid=1594904776&sprefix=dvbt+dong%2Caps%2C184&sr=8-2
https://www.smart-home-komponente.de/nano-cul/nano-cul-868-extra/

https://www.diehl.com/metering/en/portfolio/software-system-components/software-system-components-products/software-system-components-product/izar-radio-compact-hall/74843/