Domoticz on Pi3 with SDM120C Modbus

This file describes how to install SDM120c Modbus in Domoticz on Raspberry Pi 3

You need a Raspberry Pi with Domoticz and a Modbus to USB converter

Then follow the following steps:

Step 1: Install libmodbus and SDM120C software

Make a telnet connection to the Pi

sudo apt-get install libmodbus5 libmodbus-dev git
git clone https://github.com/gianfrdp/SDM120C.git
cd SDM120C
make clean && make
sudo make install
cd ..

Step 2: Add hardware and devices in Domoticz

Go to the hardware page and select by type Dummy (Does nothing, use for virtual switches only)
And name it SDM120C, if you like
Create now a virtual sensor with the name of the first SDM120C meter with type Electric(Instant+counter)
Do this for every SDM120C meter you connect
Remember the ID of every SDM120C you add

Step 3: Script for reading and putting it in Domoticz

Copy the following text:

#!/bin/bash
#title           :SDM120C Modbus
#description     :Read current from sdm120 and sends it to Domoticz.
#author          :RP
#date            :20170920
#version         :0.1
#usage           :
#notes           :
#bash_version    :
#==============================================================================
SERVER="http://127.0.0.1:8084"   #server location
IDXTGroep3=10	#id of your device in Domoticz for total + power
IDGroep3=1	#id of device (modbus id)

IDXTGroep4=11
IDGroep4=2

IDXTGroep5=12
IDGroep5=3

IDXTGroep11=13
IDGroep11=4

VALUES=NOK
#echo $VALUES #Debugging line
while [ "$VALUES" = "NOK" ]
do
	VALUES=`/home/pi/SDM120C/sdm120c /dev/ttyUSB1 -a $IDGroep3 -b 9600 -P N -p -t -q` #i=imported / e=exported / t=totaal / p=vermogen/ q=short output
	#echo $VALUES #Debugging line
	if [[ $VALUES == *NOK* ]]
	then
		VALUES=NOK
	fi
done
VERMOGEN=`echo $VALUES | cut -d ' ' -f1`;
TOTAAL=`echo $VALUES | cut -d ' ' -f2`;
#echo $VERMOGEN
#echo $TOTAAL
URL=$SERVER"/json.htm?type=command&param=udevice&idx="$IDXTGroep3"&nvalue=0&svalue="$VERMOGEN";"$TOTAAL"";
#echo $URL;
#printf %s "$URL" | xxd;
curl $URL #send to domoticz

VALUES=NOK
#echo $VALUES #Debugging line
while [ "$VALUES" = "NOK" ]
do
	VALUES=`/home/pi/SDM120C/sdm120c /dev/ttyUSB1 -a $IDGroep4 -b 9600 -P N -p -t -q` #i=imported / e=exported / t=totaal / p=vermogen/ q=short output
	#echo $VALUES #Debugging line
	if [[ $VALUES == *NOK* ]]
	then
		VALUES=NOK
	fi
done
VERMOGEN=`echo $VALUES | cut -d ' ' -f1`;
TOTAAL=`echo $VALUES | cut -d ' ' -f2`;
#echo $VERMOGEN
#echo $TOTAAL
URL=$SERVER"/json.htm?type=command&param=udevice&idx="$IDXTGroep4"&nvalue=0&svalue="$VERMOGEN";"$TOTAAL"";
#echo $URL;
#printf %s "$URL" | xxd;
curl $URL #send to domoticz

VALUES=NOK
#echo $VALUES #Debugging line
while [ "$VALUES" = "NOK" ]
do
	VALUES=`/home/pi/SDM120C/sdm120c /dev/ttyUSB1 -a $IDGroep5 -b 9600 -P N -p -t -q` #i=imported / e=exported / t=totaal / p=vermogen/ q=short output
	#echo $VALUES #Debugging line
	if [[ $VALUES == *NOK* ]]
	then
		VALUES=NOK
	fi
done
VERMOGEN=`echo $VALUES | cut -d ' ' -f1`;
TOTAAL=`echo $VALUES | cut -d ' ' -f2`;
#echo $VERMOGEN
#echo $TOTAAL
URL=$SERVER"/json.htm?type=command&param=udevice&idx="$IDXTGroep5"&nvalue=0&svalue="$VERMOGEN";"$TOTAAL"";
#echo $URL;
#printf %s "$URL" | xxd;
curl $URL #send to domoticz

VALUES=NOK
#echo $VALUES #Debugging line
while [ "$VALUES" = "NOK" ]
do
	VALUES=`/home/pi/SDM120C/sdm120c /dev/ttyUSB1 -a $IDGroep11 -b 9600 -P N -p -t -q` #i=imported / e=exported / t=totaal / p=vermogen/ q=short output
	#echo $VALUES #Debugging line
	if [[ $VALUES == *NOK* ]]
	then
		VALUES=NOK
	fi
done
VERMOGEN=`echo $VALUES | cut -d ' ' -f1`;
TOTAAL=`echo $VALUES | cut -d ' ' -f2`;
#echo $VERMOGEN
#echo $TOTAAL
URL=$SERVER"/json.htm?type=command&param=udevice&idx="$IDXTGroep11"&nvalue=0&svalue="$VERMOGEN";"$TOTAAL"";
#echo $URL;
#printf %s "$URL" | xxd;
curl $URL #send to domoticz

And save it as a .sh file
This file get the information of 4 meters, so change it for the total of meters you need
Also change the text /dev/ttyUSB1 to the USB which is the Modbus-to-USB converter
Copy this file to the folder: /home/pi/domoticz/scripts/SDM120C

Step 4: Automatic readings

Connect to the Pi with Telnet
crontab -e
Add the following text at the end of the file

PATH=~/bin:/usr/bin/:/bin
SHELL=/bin/bash
*/1 * * * * /home/pi/domoticz/scripts/SDM120C/nameofthefile.sh >/dev/null 2>&1

Change the name of the file to what you name it
For more information about crontab: http://www.adminschoice.com/crontab-quick-reference

Now it will work