Category: Python

cd ~

sudo apt-get install -y git git-core cmake libusb-1.0-0-dev
sudo apt update
sudo apt install -y build-essential
git clone git://git.osmocom.org/rtl-sdr.git
cd rtl-sdr/ && mkdir build && cd build/
cmake ../ -DINSTALL_UDEV_RULES=ON
sudo make
sudo make install
sudo ldconfig
cd ~
sudo cp ./rtl-sdr/rtl-sdr.rules /etc/udev/rules.d/

# create file
no-rtl.conf

sudo nano /etc/modprobe.d/no-rtl.conf

# add these three
lines

blacklist
dvb_usb_rtl28xxublacklist rtl2832blacklist rtl2830

sudo reboot
lsusb
rtl_test -t

Build and install
rtl_433

sudo apt-get install -y libtool libusb-1.0.0-dev librtlsdr-dev rtl-sdr doxygen
git clone https://github.com/merbanan/rtl_433.git
cd rtl_433/ 
mkdir build 
cd build 
cmake ../ 
make
sudo make install
rtl_433 -f 344975000 -R 70

https://www.rtl-sdr.com/

These are commonly installed by ADT Home security Systems and are for the most part great. They have a long battery life, a reasonable range, work on RF technology. If your subscription has run out or you wish to repurpose, how do you interface these great little sensors with Home Assistant ? Read on..

https://github.com/merbanan/rtl_433

def rtl_433_probe():
    """Run a rtl_433 UDP listener."""
    global exitFlag
    global doorVolume

    time.sleep(4) # put this here incase any code could crash the pi


    jq.setVolume(doorVolume)

    try:
    # Create listener for incoming json string packets.
        sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
        sock.bind((UDP_IP, UDP_PORT))
        
        ## Connect to MQTT
        mqttc = mqtt.Client()
        mqttc.on_connect = mqtt_connect
        mqttc.on_disconnect = mqtt_disconnect
        mqttc.on_message=on_message        #attach function to callback
        mqttc.on_connect_fail=connect_fail_callback
        mqttc.username_pw_set(MQTT_USERNAME, password=MQTT_PASSWORD)
        LogEvent("connecting to " + MQTT_HOST)            
        mqttc.connect(MQTT_HOST, MQTT_PORT, 60)
        mqttc.loop_start()
        
    
    except Exception as e:
        LogEvent("main loop exception %s" % (e))   
        time.sleep(5)
        exit(1)  

    
    ## Receive UDP datagrams, extract json, and publish.
    while not exitFlag:
        line, addr = sock.recvfrom(1024)
        try:
            line = parse_syslog(line)
            data = json.loads(line)
            publish_sensor_to_mqtt(mqttc, data, line)

        except ValueError:
            LogEvent("issue with json")
            pass

  

def run():
    """Run main or daemon."""
    # with daemon.DaemonContext(files_preserve=[sock]):
    #  detach_process=True
    #  uid
    #  gid
    #  working_directory
    rtl_433_probe()


if __name__ == "__main__":
    run()

Supervisor

pi@doorrf:/etc/supervisor/conf.d $ cat doorrf.conf
[program:doorrf]
command=python /home/pi/doorrf.py
user=pi
autostart=yes
autorestart=yes
startretries=100


pi@doorrf:/etc/supervisor/conf.d $ cat rtl_433.conf
[program:rtl_433]
command=/home/pi/rtl_433/build/src/rtl_433 -f 344975000 -R 70 -F syslog:127.0.0.1:1433
user=pi
autostart=yes
autorestart=yes
startretries=100


pi@doorrf:/etc/supervisor/conf.d $ cat squeeze.conf
[program:squeezebox]
command=/usr/bin/squeezelite-armv6hf -o sysdefault:CARD=sndrpihifiberry -s 10.0.0.36 -n doorrf
user=pi
autostart=yes
autorestart=yes
startretries=100

Install
supervisord

sudo apt-get install -y supervisor

Supervisor Commands

sudo service supervisor start

sudo
service supervisor status

sudo
service supervisor stop

sudo
service supervisor restart