Hello all,
I live in an apartment for rent and recently we got new water meters. I have noticed that a radio module (https://www.engelmann.de/en/product/faw-radio-add-on-module/) is installed on the water meter and would like to read and process this with HA. How can I receive the data? Has anyone here done this before?
Thank you in advance!
You have to search for a wireless M-Bus integration in HA.
Quick search pointed at some tracks to explore further:
Viel Erfolg 
it seems to be that there is something in this direction already prepared:
wmbusmeters/wmbusmeters-ha-addon: To become the new public ha-addon repository for wmbusmeters. (github.com)
It seems that the rtlsdr drivers (RTL2832U devices) are supported. I haven’t seen anything related to Engelmann so far.
Engelmann works with 868MHz. It has to be activated by the operator which is very rare. I tried my best to understand how can I activate and connect but failed multiple times. It uses some software which is expensive to buy. If anyone has found to activate the radio module for wireless mbus, please share here. Thanks
In my case the radio communication is on. But the encryption is for the whole building, at least and therefore the company thst installed the device can’t share the encryption key with me or anyone else.
The same issue, but I request my own Key. They have to visit me on site and generate a new key, then add it to the device. After that I have my own key and can read the data.
Of course they were “unhappy” to give it to me, but as soon as I bought meters and not rent them, there was no way out.
P.S. it is done with software from Engelmann with some dongle that have to be placed directly on the device.