This program is developed to be used on Raspberry Pi 3 B+ together with a CC1101 radiomodule.
The program will listen to interrupts generated from the CC1101. When an interrupt is recieved the data will be stored to a variable length buffer of class SensorKNXRF. Every 15th second the program will request items from OpenHab with tag RoomThermostat (these have to be created as items in the OpenHab config) with the serial identifier for each unique thermostat. If there is a matching serial identifier in the buffer the OpenHab item will be updated with new values. See example below.
| Raspberry pin # | Name | CC1101 |
|---|---|---|
| 17 | 3.3V | VCC |
| 18 | GPIO24 | GDO0 |
| 19 | GPIO10 (SPI_MOSI) | SI |
| 20 | Ground | GND |
| 21 | GPIO09 (SPI_MISO) | SO |
| 22 | GPIO25 | GDO2 |
| 23 | GPIO11 (SPI_CLK) | SCLK1 |
| 24 | GPI008 (SP_CE0_N) | CSn |
Note: GDO0 is not used in the program. which GDO for interrupts to use is specifed in the configuration of the chip, see cc1101.cpp (look for IOCFG[0..2] and the data sheet for the CC1101.
You need to make sure SPI is enabled on your Raspberry:
> ls /dev/spi*
If there is no SPI device you need to enable it by running raspi-config as this option to enable SPI does not seem to exist in openhabian-config.
> sudo apt install raspi-config
> sudo raspi-config
Navigate to Interface Options->SPI and enable the SPI interface.
This program depends on:
- systemd-dev
- liburl
- jsmn
- WiringPi (deprecated, TODO: update to pigpio)
You need to get the develop-package systemd-dev
> sudo apt-get install libsystemd-dev
There are three different versions of libcurl*-dev:
- libcurl4-gnutls-dev
- libcurl4-nss-dev
- libcurl4-openssl-dev
Check the version of curl installed (if installed):
~/MonitorKNXRF> curl --version
curl 7.74.0 (arm-unknown-linux-gnueabihf) libcurl/7.74.0 OpenSSL/1.1.1n zlib/1.2.11 brotli/1.0.9 libidn2/2.3.0 libpsl/0.21.0 (+libidn2/2.3.0) libssh2/1.9.0 nghttp2/1.43.0 librtmp/2.3
In this case the already installed curl version use openssl, it is recommended to use the same to avoid any conflicts:
> sudo apt-get install libcurl4-openssl-dev
Jsmn is a minimalistic JSON-parser and is just a header-file (since v1.1.0). It is included as a submodule to this repository. It will be included by the Makefile when compiling.
WiringPi is now deprecated. The source code is added as a submodule to this repository and it is included in the Makefile.
Clone this repository:
git clone [email protected]:aviborg/MonitorKNXRF.git
Update the dependencies:
openhabian@hab3:~/MonitorKNXRF $ git submodule update --init --recursive
Compile the program by running make:
~/MonitorKNXRF> make
g++ -c -Wall -I/home/openhabian/jsmn -Iinclude/ monitorknxrf.cpp include/*.cpp
g++ -o monknxrf monitorknxrf.o cc1101.o openhabRESTInterface.o sensorKNXRF.o -L/home/openhabian/jsmn -lcurl -lwiringPi -lsystemd
Run the program with debug level 2:
./monknxrf 2
Change set temperature on any of your thermostats, and wait a minium 15 seconds. Press Ctrl+C to stop the program. Then check the log:
grep -in monitorknxrf /var/log/syslog
...
24447:Jan 2 12:09:00 hab monknxrf: MonitorKNXRF is requesting data from Openhab.
24448:Jan 2 12:09:00 hab monknxrf: MonitorKNXRF got data from sensor 007402363C12 reading 2232 and 1950.
24451:Jan 2 12:09:00 hab monknxrf: MonitorKNXRF: marcstate: 0x01
In this case the actual temperature is 22.32 C and the set temperature is 19.5 C.
Sometimes the thermostats send 4094. This is nothing to worry about, it will be filtered before being sent to Openhab
30963:Jan 27 12:05:41 hab monknxrf: MonitorKNXRF got data from sensor 007402363C0C reading 4094 and 2000.
30964:Jan 27 12:05:41 hab monknxrf: MonitorKNXRF got data from sensor 0074045CF417 reading 2152 and 4094.
To make this thermostat as an item in Openhab just add it as an Openhab item in a items-file (/etc/openhab2/items/thermostats.items):
Number roomThermostatBattery007402363C12 "Kontor battery [%f]" [RoomThermostat]
Number roomThermostatActTemp007402363C12 "Kontor actual temp [%f]" [RoomThermostat]
Number roomThermostatSetTemp007402363C12 "Kontor set temp [%f]" [RoomThermostat]
Number roomThermostatRSSI007402363C12 "Kontor rssi [%f]" [RoomThermostat]
monknxrf will use the Openhab REST api to set values. To check that items are available through the REST interface try this:
> curl -X GET --header "Accept: application/json" "http://localhost:8080/rest/items" | jq
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 16556 0 16556 0 0 52392 0 --:--:-- --:--:-- --:--:-- 52558
[
{
"link": "http://localhost:8080/rest/items/roomThermostatBattery007402363C02",
"state": "NULL",
"stateDescription": {
"pattern": "%d",
"readOnly": false,
"options": []
},
"editable": false,
"type": "Number",
"name": "roomThermostatBattery007402363C02",
"label": "Tvättstuga battery",
"category": "batteri",
"tags": [
"RoomThermostat"
],
"groupNames": []
},
To make the program running as a system service you need to copy the the systemd files as this:
> sudo cp monknxrf /usr/bin/.
> sudo cp monitorknxrf.service /usr/lib/systemd/system/.
> sudo systemctl enable monitorknxrf.service
When the Raspberry is restarted the service should start automatically. It is possible to manually start/stop and check the status of the program:
[12:33:15] openhabian@hab:~/MonitorKNXRF$ sudo systemctl start monitorknxrf.service
[12:33:25] openhabian@hab:~/MonitorKNXRF$ sudo systemctl status monitorknxrf.service
● monitorknxrf.service - Service to collect KNX RF data and send to openhab2 via the REST API
Loaded: loaded (/usr/lib/systemd/system/monitorknxrf.service; enabled)
Active: active (running) since Thu 2020-01-02 12:33:25 CET; 2s ago
Main PID: 16235 (monknxrf)
CGroup: /system.slice/monitorknxrf.service
└─16235 /usr/bin/monknxrf
Jan 02 12:33:25 hab systemd[1]: Started Service to collect KNX RF data and send to openhab2 via the REST API.
Jan 02 12:33:25 hab monknxrf[16235]: MonitorKNXRF started
To remove any all build artifacts including the monknxrf application:
~/MonitorKNXRF> make clean
If you longer need the program you stop the service and then remove the files from the system directory:
> sudo systemctl stop monitorknxrf.service
> sudo systemctl disable monitorknxrf.service
> sudo rm /usr/bin/monknxrf
> sudo rm /usr/lib/systemd/system/monitorknxrf.service
Then you uninstall the WiringPi library:
~/MonitorKNXRF> make uninstall
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