Control a Dometic FreshJet 1700 air conditioner over BLE using ESPHome and expose it to Home Assistant via MQTT Climate.
This project provides a fully working ESPHome configuration that:
- Connects to a Dometic air conditioning unit over BLE
- Publishes MQTT Discovery for Home Assistant
- Exposes a proper Climate entity
- Supports fan modes, sleep preset, and light brightness
- Uses retained MQTT state
The project is not fully clean and there are quite a few artifacts left in it from the iterative development. I have left these in purposefully for the most case as they expose selects and other entities that may be useful for somebody that does not want/need the climate entity or want to bother with MQTT!
- ✅ Climate entity (cool / heat / fan_only / auto / dry / off)
- ✅ Fan modes (low / medium / high / turbo / auto)
- ✅ Sleep preset (only valid in Cool and Heat)
- ✅ Independent light control (Off / 50% / 100%)
- ✅ Retained MQTT state handling
- ✅ MQTT Discovery compatible
- ✅ No custom HA integration required
- ESP32 (tested on ESP32 DevKit)
- Dometic FreshJet 1700 (BLE version)
- Home Assistant with MQTT broker enabled (You will need the latest greatest HA and ESPHome > 2026.2.0)
- Install ESPHome.
- Install the MQTT App and configure a user
- Copy
dometicac.yamlinto your ESPHome config directory. - Create a
secrets.yamlfile. - Adjust your WiFi and MQTT credentials.
- Determine the mac address of your Dometic unit. You can do this using nrf Connect on a phone though I believe iOS will not expose the mac address for some security reasons but Android should!
- Flash the ESP32.
- Restart Home Assistant.
The Climate entity will appear automatically via MQTT discovery.
wifi_ssid: "YourSSID"
wifi_password: "YourPassword"
mqtt_user: "mqtt"
mqtt_password: "mqttpassword"| Topic | Description |
|---|---|
| camper/dometic/status | Availability |
| camper/dometic/mode | Current HVAC mode |
| camper/dometic/fan | Current fan speed |
| camper/dometic/current_temp | Measured temperature |
| camper/dometic/target_temp | Target temperature |
| camper/dometic/preset | Preset (none / sleep) |
| camper/dometic/set_mode | Mode command |
| camper/dometic/set_fan | Fan command |
| camper/dometic/set_temp | Temperature command |
| camper/dometic/set_preset | Preset command |
All state topics are retained to ensure proper HA startup behaviour.
| Register | Function |
|---|---|
| 0x01 | Power |
| 0x02 | Fan mode |
| 0x03 | HVAC mode |
| 0x04 | Target temperature |
| 0x05 | Light power |
| 0x06 | Light brightness |
| 0x0A | Current temperature |
| 0x1B | Sleep mode |
- Sleep is only valid in Cooling and Heating modes.
- If selected in other modes, it automatically resets to
none.
The Dometic unit only supports:
- Off
- 50%
- 100%
Brightness values are automatically snapped to valid levels.
- Light brightness is restricted to 50% and 100% (device limitation)
- Tested primarily on FreshJet 1700 BLE variant that has the four operational modes. If you only have cooling you will need to edit as appropriate.
- Note I could only get a Climate entity exposed by using MQTT. I even tried creating an external component but the new Home Assistant and ESPHome would not allow the BLE nor the climate entity properly. Feel free to suggest a differnt method!
MIT License
This project is not affiliated with or endorsed by Dometic.
Use at your own risk.
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