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SMA-EM

a detailed german description could be found here https://www.unifox.at/software/sma-em-daemon/

translated by google https://translate.google.com/translate?sl=de&tl=en&u=https://www.unifox.at/software/sma-em-daemon/

SMA Energymeter / Homemanager measurement

sma-em-measurement.py: Python3 loop display SMA Energymeter measurement values

sma-daemon.py: Python3 daemon writing consume and supply values to /run/shm/em-[serial]-[value]

# HINT #
Sma homemanager version 2.3.4R added 8 Byte of measurement data.
This version trys to detect the measurement values on obis ids, so it should be save if new values were added or removed.

Requirements

python3 sys time configparser (SafeConfigParser) signal

some features require additional python modules features/README.md should give an overview of maintained features. features-outdated/README.md: other features untested because I do not have the appropriate hardware / software could be found in features-outdated.

Configuration

create a config file in /etc/smaemd/config
Use UTF-8 encoded configfile
Example:

[SMA-EM]
# serials of sma-ems the daemon should take notice
# seperated by space
serials=30028xxxxx
# features could filter serials to, but wouldn't see serials if these serials was not defines in SMA-EM serials
# list of features to load/run
features=simplefswriter sample

[DAEMON]
pidfile=/run/smaemd.pid
# listen on an interface with the given ip
# use 0.0.0.0 for any interface
ipbind=192.168.8.15
# multicast ip and port of sma-datagrams
# defaults
mcastgrp=239.12.255.254
mcastport=9522

# each feature/plugin has its own section
# called FEATURE-[featurename]
# the feature section is required if a feature is listed in [SMA-EM]features

[FEATURE-simplefswriter]
# list serials simplefswriter notice
serials=1900204522
# measurement vars simplefswriter should write to filesystem (only from smas with serial in serials)
values=pconsume psupply qsupply ssupply

[FEATURE-sample]
nothing=here

Routing

maybe you have to add a route (example: on hosts with more than one interface) 

sudo ip route add 224.0.0.0/4 dev interfacename

Install / Copy (tested on Raspbian 9.1)

sudo apt install git
sudo apt install python3 cl-py-configparser
sudo mkdir /opt/smaemd/
sudo mkdir /etc/smaemd/
sudo useradd -c "smaemd-user" -d /opt/smaemd -M -N -r -s /usr/sbin/nologin smaemd
cd /opt/smaemd/
sudo git clone https://github.com/datenschuft/SMA-EM.git .
sudo cp systemd-settings /etc/systemd/system/smaemd.service

Create a /etc/smaemd/config file

sudo cp /opt/smaemd/config.sample /etc/smaemd/config

Edit the /etc/smaemd/config file and customize it to suit your needs (e.g. set SMA energy meter serial number, IP address, enable features)

sudo nano /etc/smaemd/config

Update systemd

sudo systemctl daemon-reload
sudo systemctl enable smaemd.service
sudo systemctl start smaemd.service

feel lucky and read /run/shm/em--

Testing

sma-em-capture-package - trys to capture a SMA-EM or SMA-homemanager Datagram and display hex and ascii package-info and all recogniced measurement values. Cloud be helpful on package/software changes.