@jan-kocon I actually submitted a fix for the echo/ack that is now in the most recent version of Home Assistant. So, as long as you are on the most current version the default sketches should work now.

@ghiglie Check out these links if you haven't used NRF5 before. They should help you get started.
https://forum.mysensors.org/topic/9266/guide-nrf5-nrf51-nrf52-for-beginners
https://www.openhardware.io/view/376/MySensors-NRF5-Platform

I found the ST-LINK programmer to be easier to work with (using Windows) that the J-LINK

@Jan-Kocon I found the issue. Home Assistant doesn't request an Ack response for some reason. Here is a comparison of my current home automation controller (Vera) and Home Assistant. The top line is Vera (requesting an Ack response) and the bottom line is Home Assistant.
https://www.mysensors.org/build/parser?log=19%3B0%3B1%3B1%3B2%3B1 19%3B0%3B1%3B0%3B2%3B0

@Jan-Kocon I am experiencing the same thing with my devices (where the status doesn't stick but the relay stays on). I haven't had time to dig into it yet but I suspect this ultimately needs to be fixed in the Home Assistant integration. The example code on the Home Assistant site sends back the status after the relay has been updated. The MySensors RelayActuator sketch does not send back the status this way.

It seems to me there are two workarounds for this.

1. Set the "optimistic" setting in the home assistant configuration.yaml file to True
2. Send the state back to Home Assistant after the relay has been changed. See these lines of code for in the example:

    // Change relay state
    state = (bool)message.getInt();
    digitalWrite(RELAY_PIN, state?RELAY_ON:RELAY_OFF);
    send(msg.set(state?RELAY_ON:RELAY_OFF));```

@Jan-Kocon I would recommend starting with the relay example sketch that is in the presentation section of this site: https://www.home-assistant.io/components/mysensors/#presentation

Once you have that working you can start integrating your existing sketch in to that one.

One thing I notice with your existing sketch is you have a sensor type of "S_LIGHT" which doesn't exist. You need S_BINARY (https://www.mysensors.org/download/serial_api_20).
You also need to send the initial value in the loop function like this:

  if (!initialValueSent) {
    Serial.println("Sending initial value");
    send(msg.set(state?RELAY_ON:RELAY_OFF));
    Serial.println("Requesting initial value from controller");
    request(CHILD_ID, V_STATUS);
    wait(2000, C_SET, V_STATUS);
  }```

@jan-kocon I am just learning Home Assistant myself so I'm no expert. One thing it looks like your relay code is missing is to send an initial relay value in the loop function of your code when the node first starts (which is required by Home Assistant). Here is the link for more info: https://www.home-assistant.io/components/mysensors/#presentation

@berkseo nice! What did you use for the capacitive sensor? MPR121?

@lange60 you need a gateway that the Vera connects to. I use the Ethernet gateway with NRF radios. So, Vera connects via IP/Ethernet and the gateway connects to the sensors wirelessly via NRF radios. Most of my devices (including the gateway) use Arduino Pro Minis.

@Kai-Bepperling I have been wanting to make something like this for years. I keep getting sidetracked so I have never completed anything. I am excited to try this method at some point. I have a few rooms where this would work much better than the motion sensors I have now. Thank you for posting this.

Maybe you need to update the bootloader and/or fuses? Maybe it has a brownout setting of 4.3V?

http://www.ladyada.net/learn/avr/fuses.html