wmbusmeters

The program receives and decodes C1 telegrams (using the wireless mbus protocol) to acquire utility meter readings. No configuration file exists, you change main.cc, recompile and run to output the values you are interested in, typically to log and be processed by another tool.

Builds and runs on GNU/Linux:

make

./build/wmbusmeters

./build/wmbusmeters --verbose

make HOST=arm

./build_arm/wmbusmeters

make DEBUG=true

./build_debug/wmbusmeters

make DEBUG=true HOST=arm

./build_arm_debug/wmbusmeters

(After you insert the im871A USB stick, do:

chown me:me /dev/ttyUSB0

to avoid having to run the program as root.)

Currently only supports the USB stick receiver im871A and the water meter Multical21. The source code is modular and it should be relatively straightforward to add more receivers (Amber anyone?) and meters.

Good documents on the wireless mbus protocol:

https://www.infineon.com/dgdl/TDA5340_AN_WMBus_v1.0.pdf

http://fastforward.ag/downloads/docu/FAST_EnergyCam-Protocol-wirelessMBUS.pdf

The AES source code is copied from:

https://github.com/kokke/tiny-AES128-C

The following two other github projects were of great help:

https://github.com/ffcrg/ecpiww

https://github.com/tobiasrask/wmbus-client

Code can print total water consumption! But everything else is missing. CRC checks anyone? :-) Don't rely on these measurements for anything really important!