actual room temperature via mqtt instead of bluetooth sensor

[dodo45674]

Hello,

is it possible to provide the actual room temperature in a other way than via blueetoth sensor? For example via mqtt?

I am looking for a way to use the temperature sensors of my loxone home automation system to provide the actual room temperature to the AC unit.

Best regards

[revk]

Yes, there is a documented control message for this. command/Faikin/control with env in a JSON payload.

[dodo45674]

Many thanks for the very quick and helpful reply!
Is this also possible via simple http commands or only via mqtt?

[revk]

I don't have via http. I do have via various BLE formats. Sorry.

[andypnz]

Hi. I had exactly this question as well :-)

Basically, I am wanting to use an external temperature reference (I guess to replace the value from sensor.xxx_ac_home).

I already have a Dallas temp sensor connected to an ESP32 (running ESPHome, which connects to Home Assistant) - I would like to use this as the temperature reference.

1. Is it possible to send this temperature reference via BT from the ESP32 to the Faikin directly (in the same way as a Telink BT temp sensor would)?
2. Alternatively, I could send via MQTT - is it possible to do this and use in the same way as with a BT? I would prefer not to use the env variable, which I think requires using Faikin auto control.

BLE:
The Target uses the air-con's own temperature sensor normally, but if you have a BlueCoinT BLE or Telink sensor you can select that as an external reference. This allows the room to be controlled based on a sensor that may be by your bed or where your sit._

I am thinking something along these lines in my ESP32 (ESPHome) YAML:

esp32_ble_server:
  id: ble
  manufacturer_data: [0xFF, 0xFF, 0xF1, 0x00]


time:
  - platform: sntp
    id: ntp

    on_time:
      - seconds: "/60"
        then:
          - lambda: |-
              ESP_LOGD("main", "Sending advertisement...");
              float current_value = id(inside_temperature_sensor).state;
              uint8_t *float_data = (uint8_t*)&current_value;
              ESP_LOGD("main", "Sending updated Level %f", current_value);
              id(ble).set_manufacturer_data({ 0xFF, 0xFF, 0xF9, float_data[0], float_data[1], float_data[2], float_data[3]});

This gives a value in my BLE scanner app on my iPhone

[revk]

Sending using BTHome or BTHome2 format allows this. No idea how you do that on the platform you are using.

[andypnz]

Would it be possible to share the BTHome / BTHome2 code - that way I can see the data required?
Thank you!

[revk]

All my code is in github, and if you google you can find the spec for BTHome and BTHome2

[andypnz]

Hi again

1. The BLE sensor ID. Is this the 'device name' as reported by a BLE scanning app?
   

2. Do I need to populate all three BLE data fields? Or is it ok to only send temperature?

3. Currently, I am only sending temperature, and have used the 'device name', and don't see the BLE temp populated. It 'health Thermometer', and 'temperature measurement' ok to use - or shoudl I have different names (UUID's) here?

Any small hints appreciated

[revk]

autob is name or MAC, but there is a pull down on the other screens / main menu for what it sees once BLE is turned on.

You can just send temp.

Let me look at that hex - what app are you using to scan BLE, so I can compare how it shows what I have.

[andypnz]

Thank you... I have now seen the MAC and selected that... unfortunately the BLE temp value on the start screen remains unpopulated...

The hex should be a temp of inside temp + 10 degrees - so around 34 degrees (I was trying to send something high so the heat pump would turn down). And advice on the hex and the heading the hex should appear under would be really appreciated...

I am using BLE Scanner (connect and notify) on Android. Just a quick note - you need to click on the blue 'N' on the righthand side of the screen to see the hex data.

Thanks for your help :-)

             float current_value = id(inside_temperature_sensor).state;
             int16_t temp_encoded = static_cast<int16_t>((current_value + 10.0 ) );  // Convert to 0.01 °C units  *100
             std::vector<uint8_t> payload;

             payload.push_back(0x40);        // BTHome v2 header, no encryption
             payload.push_back(0x02);        // Object ID: temperature
             payload.push_back(0xFA);        // Format: 2 bytes, signed int (0.01°C)
             payload.push_back(temp_encoded & 0xFF);
             payload.push_back((temp_encoded >> 8) & 0xFF);

             id(ble).set_value(payload);
             id(ble).notify();

[revk]

OK my code for BTHome2 generation in ESP32-BLE-Env has the following after the following after the initial 02 (len) 01 flags 06 discoverable no BR.

• len
• 16 BTHome2
• D2
• FC
• 40 v2
• 02 Temp
• low byte
• high byte

[andypnz]

Hummm. still no joy... Could I ask how the Faikin knows it is temperature data? Is it anything with 0x02 in that position?

esp32_ble_server:
  services:
    - uuid: "1809"  # Health Thermometer (standard)
      characteristics:
        - uuid: "2A1C"
          id: ble
          value: [0x02, 0x16, 0xD2, 0xFC, 0x40, 0x02, 0x34, 0x09]
          notify: true

[revk]

Ok that header is the UUID though, do you have the right UUID? Are you trying BTHome or BTHome2

[revk]

Also, just to be clear. This is all in the announcement, not a separate service when connected. You need to be able to edit the announcement.

[andypnz]

Thank you.... I think I am a bit stuck creating an announcement rather than a separate service..... I will try and sort that out first...

[andypnz]

Some small progress

So this is the raw data from your Faikin remote:

This is the raw data I am currently sending:

Temperature is still not recognised by the Faikin - do you think I need to send the rest of the data? This includes humidity, ppm. lux, and two versions of the complete local name

[revk]

It should work without name. And should work with only temp set.

Does the pull down list it as a device (by MAC) at all?

[andypnz]

Thank you! Now working.... I had manually entered the name as the BLE sensor ID. I deleted this, re-selected from the drop down, and all working....

Thanks again for your support getting this going :-)

[revk]

Cool