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docs(readme): installation and execution instructions
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README.md
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README.md
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# python-itho-wpu
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A python library and a set of command line tools to communicate with an Itho WPU.
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# Hardware installation
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See the [pislave](https://github.com/ootjersb/pislave#wiring) project
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# Software installation
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1. Install [Raspberry Pi OS Lite](https://www.raspberrypi.org/software/operating-systems/)
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1. Enable [SSH](https://www.raspberrypi.org/documentation/remote-access/ssh/) and [I2C](https://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/configuring-i2c) using `raspi-config`
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1. Install and configure the required software
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```
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apt-get install \
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git \ # To clone this repository
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pigpiod \ # Pigpio daemon to communicate over the I2C bus
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python3-pigpio \ # Python module to talk to the pigpio daemon
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python3-pyodbc \ # Python module to access an ODBC database
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sqlite3 \ # To store a subset of the Itho database in SQLite
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direnv \ # Environment variable manager to store credentials for InfluxDB
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python3-influxdb # To export measurements to InfluxDB
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# Set the sample rate value of pigpiod to 10 microseconds to decrease CPU usage
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sed -i -e 's/ExecStart=.*/ExecStart=\/usr\/bin\/pigpiod -l -s 10/' /lib/systemd/system/pigpiod.service
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# Enable pigpiod service
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systemctl enable pigpiod
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```
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Install version 0.9.0-1 of odbc-mdbtools
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```
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ARCH=$(dpkg --print-architecture)
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curl -OL http://snapshot.debian.org/archive/debian/20201218T033640Z/pool/main/m/mdbtools/odbc-mdbtools_0.9.0-1_${ARCH}.deb
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curl -OL http://snapshot.debian.org/archive/debian/20201218T033640Z/pool/main/m/mdbtools/libmdb3_0.9.0-1_${ARCH}.deb
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curl -OL http://snapshot.debian.org/archive/debian/20201218T033640Z/pool/main/m/mdbtools/libmdbsql3_0.9.0-1_${ARCH}.deb
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dpkg -i libmdb3_0.9.0-1_${ARCH}.deb libmdbsql3_0.9.0-1_${ARCH}.deb odbc-mdbtools_0.9.0-1_${ARCH}.deb
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```
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*When executing `convert-itho-db.py` with mdbtools version ...*
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* *0.7.1-6 (Debian Buster) it fails with: `ValueError: the query contains a null character`*
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* *0.9.1-1 (Debian Bullseye) it fails with: `Segmentation fault`*
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1. Reboot the Raspberry Pi
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```
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reboot
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```
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1. Install python-itho-wpu
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```
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git clone https://github.com/pommi/python-itho-wpu.git
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cd python-itho-wpu
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```
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1. Extract `$_parameters_HeatPump.par` from the Itho Service Tool. This is a Microsoft Access database containing details about all WPU versions.
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* Download it directly:
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```
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curl -OL "https://servicetool.blob.core.windows.net/release/Parameters/\$_parameters_HeatPump.par"
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```
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* Or download the [Itho Service Tool](https://www.ithodaalderop.nl/nl-NL/professional/servicetool) and execute `AzureBootloader.exe` to retrieve the full Itho Service Tool application. `$_parameters_HeatPump.par` is located in the `Parameters` directory.
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1. Convert the Microsoft Access database to an SQLite datbase. The SQLite database is used by python-itho-wpu.
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```
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./convert-itho-db.py --itho-db \$_parameters_HeatPump.par
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```
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# Example usage of python-itho-wpu
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* Get the NodeID of the WPU
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```
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# ./itho-wpu.py --action getnodeid
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ManufacturerGroup: 1, Manufacturer: HCCP, HardwareType: WPU, ProductVersion: 25, ListVersion: 11
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```
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* Get the Serial number of the WPU
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```
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# ./itho-wpu.py --action getserial
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Serial: 408
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```
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* Get the Datalog of the WPU
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```
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# ./itho-wpu.py --action getdatalog
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Buitentemp (°C): 8.0
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Boilertemp Onder (°C): 24.23
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Boilertemp Boven (°C): 51.68
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Verdamper Temp (°C): 19.84
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Zuiggas Temp (°C): 21.7
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Persgas Temp (°C): 30.22
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Vloeistof Temp (°C): 18.67
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Temp Naar Bron (°C): 21.09
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Temp Uit Bron (°C): 19.75
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...
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```
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# Exporting measurements
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## InfluxDB
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Assuming InfluxDB is running on the Raspberry Pi as well.
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1. Configure a `.envrc` file
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```
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cat > .envrc <<EOT
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export INFLUXDB_HOST=127.0.0.1
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export INFLUXDB_USERNAME=user
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export INFLUXDB_PASSWORD=password
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export INFLUXDB_DATABASE=itho
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EOT
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```
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1. Allow direnv to load environment variables from the .envrc file
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```
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direnv allow
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```
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1. Execute `itho-wpu.pu` and export to InfluxDB
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```
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./itho-wpu.py --action getdatalog --export-to-influxdb
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```
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1. Alternatively run this in a 5 minute cronjob (the console output is written to `/var/log/itho.log`)
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```
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cat > /etc/cron.d/itho <<EOT
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PATH=/usr/bin:/bin:/usr/sbin:/sbin
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*/5 * * * * root cd /root/python-itho-wpu && direnv exec . ./itho-wpu.py --action getdatalog --export-to-influxdb >> /var/log/itho.log
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EOT
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```
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