Daemon script to feed ISKRA ME162 data to Domoticz

This python script can run as a daemon and reads the usage data from an ISKRA ME162 (will most likely work for other digital meters that have an iec62056-21 interface. The script was developed using a IR-head from http://wiki.volkszaehler.org/hardware/controllers/ir-schreib-lesekopf-usb-ausgang Other IR-heads should work too, but have not yet been tested.

Requirements

Python3

Usage:

iskra-me162

Configuration

The package installs a configuration file in /etc/default/iskra-me162. This file looks like:

# Settings for the domoticz server

domoticzserver="domoticz.home.fazant.net:8080"
domoticzusername = "XXXXX"
domoticzpassword = "XXXXXXXX"
device_index = 54

# port for ir-head

port = "/dev/ttyUSB0"

# use high speed: switch to high speed reading, may not work
# Set True or False
use_highspeed = False

# print debug information?
# 0 = no debug information printed
# 1 = normal debug information printed
# 2 = detailed information printed
print_debug = 0

# state file is often written, so on a raspberry pi make sure it
# is on a memory back file system (tmpfs)
state_file = "/var/run/me162-state"

# interval for updating domoticz, recommend at least 60 seconds
update_interval = 120

Description of the options in the configuration file

The settings for the domoticz server are pretty simple. The script expects a dummy device of type "Dummy". Click then the "create virtual sensors" button and select the "P1 smart meter (electric)" type for the virtual sensor. In the Setup->Devices tab look for the new device and note the Idx value allocated to the sensor. Edit the configuration file device_index to match the new device index.

If your IR-head is connected to a different serial port, edit the port value.

Print_debug will enable debug printouts from the script so you can see what happens.See the configuration file for a description of the possible values.

The script needs to maintain some state of the latest values sent to domoticz. In order not to wear out the sd-card it is recommended to store the file on a tmpfs filesystem. If the statefile is not found (e.g. after a reboot) it will be re-created.

The script is meant to be run as a daemon. The update-interval determines the frequency of updating Domoticz. A value of at least 60 seconds shall be chosen. Recommended value: 120 (seconds)

Systemd integration A systemd service file is included in the package. Execute the following to enable the service:

::: systemctl daemon-reload systemctl enable iskra-me162.service systemctl start iskra-me162.service

Known problems

The use_highspeed option, used to control the speed of the serial connection does not always work. As the amount of data to be transferred is fairly small I recommend leaving the serial speed at 300 baud (use_highspeed = False) so it always works!

The values for current consumption and energy delivered are caculated from the total consumption/delivered counters. They result is not very accurate.

Feedback

Please send patches or bug reports to <louis.lagendijk@gmail.com>

Source

You can get a local copy of the development repository with:

git clone git://github.com/llagendijk/iskra-me162.git

License

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>.