Home Assistant integrates natively the support of radio home appliances compatible with the Open Source RFLink gateway. In the previous tutorial, we saw how to include connected objects developed using the MySensors v2 library. The inclusion of radio devices using the RFLink gateway is a bit different. The technical documentation lacks details regarding the addition of devices to the groups.

RFLink gateway and hardware used for the tutorial

RFLink is an open source project that allows to realize a gateway between a home automation software and home automation devices that communicate by radio waves. This is a very economical alternative to the commercial RFXCom gateway. The RFLink project is capable of managing several 315MHz, 433MHz, 868MHz, 915MHz and 2.4GHz radio frequencies. Follow this guide to make your home radio gateway for less than €15.

For this tutorial, we will use two smoke detectors Chacon 34126 which communicate in 433MHz. They are found quite easily in DIY stores or online merchants.

Configuring the Gateway in Home Assistant

Like MySensors, RFLink is natively supported by Home Assistant. Open the configuration.yaml file. If you installed Home Assistant in a virtual environment (recommended), run this command

Otherwise, the file is located in the user folder
The first thing to do is to set up an RFLink Hub. The complete documentation is here. Two lines are enough
To find the USB port on which the gateway is connected, first connect the Arduino Mega to your computer or the Raspberry Pi. Then, in the Terminal, run the following commands to list the connected devices.
Other optional parameters can complete the configuration if necessary:

• host: in case the gateway is accessible from another TCP / IP station. Follow this tutorial that explains how to do with ser2net
• wait_for_ask: waits for confirmation of the execution of the previous command before sending the next command. This is the default active mode. It is slower but also more reliable
• ignore_devices: it is possible to ignore radio devices. The command supports the joker (*)
• reconnect_interval: waiting time in seconds between two attempts to reconnect

Enable Logger

During the debugging, it is necessary to activate the recording of the messages by the integrated logger. Create a new logger section if it does not already exist. It is possible to retrieve the radio messages as well as the messages exchanged with the gateway.

The logger accepts several levels of severity. The debug mode is suitable in most cases:

• critical
• fatal
• error
• warning
• warn
• info
• debug
• notset

Restart HASS

Save the file (CTRL + X then Y) and then restart Home Assistant. I recommend you restart the service from the interface by going to the Configuration panel for example or by executing this command from the Terminal.

Follow the launch to verify that HASS is properly connected to the gateway with this command

You can also view the log by opening the home-assistant.log file that is in the same directory as the configuration files. here is an example

All is correct, you can continue

Included devices: lights, switches, sensors

Now that HASS can connect to the gateway, all you have to do is add the devices to an existing group (or a new group). Unlike MySensors, radio devices are unfortunately not listed in the status panel.

The first thing to do is to retrieve the device ID. To do this, a single means, to operate the device to send a radio signal containing its identity. Press the test or command button and open the run-time log (home-assistant.log) in the same directory as the configuration files.

Here, by pressing the Chacon Smoke Detector test button, you will retrieve all the information needed to include it in Home Assistant.

The identifier is at the got event line.

Open the configuration file again.

Smoke detectors are managed as switches. The inclusion of a switch type device requires no special adjustment. A switch block is added with a name (used in the group). The platform is rflink. Then we list the devices (devices) connected to this block

This is the minimum configuration required. Other parameters are available to refine the management of the devices (the complete list here):

If you need to include sensors, the configuration is a bit different. It is necessary to indicate to HASS the type of sensor used. The types of sensors supported are as follows (detailed documentation):

• average_windspeed
• barometric_pressure
• battery
• weather_forecast
• doorbell_melody
• command
• co2_air_quality
• current_phase_1
• current_phase_2
• current_phase_3
• distance
• firmware
• humidity_status
• humidity
• hardware
• kilowatt
• light_intensity
• meter_value
• total_rain
• rain_rate
• revision
• noise_level
• temperature
• uv_intensity
• version
• voltage
• watt
• windchill (?)
• winddirection
• windgusts
• windspeed
• windtemp

It is the same for lights but the type is not a mandatory parameter. Here are the types of light managed (detailed documentation):

• Hybrid: send a dim command followed by ON or OFF
• Switchable: switchable, a classic lamp
• Dimmable: light dimmer
• Toogle: state inverter. Only the ON command is sent. This control may be useful for some devices such as wall switches of the brand Livolo.

Configure the group

The hardest is done, the addition of smoke detectors in a group is very simple. For example, we will create a group that presents all the smoke detectors in the house

We can add this group in the sensor view for example

Save the configuration and re-start Home Assistant from the interface or by running this command

Here, the two smoke detectors are now integrated into Home Assistant. The display is not yet perfect. The available style overload that allows you to set the sensor type via the device_class option does not seem to work for RFLink.

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