Smart-Meter madness I want to read out the meter values from my smart power meter (Sagemcom T210-D). It does come with a P1 port (DSMR 5 standard). I have the proper cable, and I do receive frames from the meter. They’re encrypted with AES 128-GCM. In addition, an AAD (“additional authentication data”) is needed. I did request the keys from my utility company, but according to them they can’t get the keys from their distributor (Kapsch).

wM-Bus follow up I did receive the AES key from the “Wasserverband Steinberg” - http://www.wv-steinberg.at . They’ve been very helpful, the key was delivered as KEM file together with the decryption pin. The wmbusmeters utilities allowed me to extract the AES key. Unfortunately I was not able to receive any frames with the nanoCUL device from the Kamstrup Multical 21. The reason was that it does send C1 telegrams. And the latest release from culfw does not include C1 support (only T1 and S1).

Introduction Wireless-M-Bus (EN13757-4:2014-2) is integrated in a lot of modern smart meters. My water utility company replaced the old analog meter with a Kamstrup Multical 21 water meter. It includes a wM-Bus module and transmits data every 16 seconds. Software I’ll be using the ‘wmbusmeters’ project to receive the meter data. The package is included in latest Fedora Linux, together with rtl-sdr, so installation was quick and easy. Hardware There are different hardware options to receive wM-Bus signals on a linux based computer.