Add Native Support for BTHomev v2 Protocol in ESPHome

[asucrews]

Component name

esp32_ble_advertising

Link to component documentation on our website

https://esphome.io/components/esp32_ble_advertising/

Describe the enhancement

Currently, ESPHome can create BLE clients or trackers, and passively receive BTHome advertisements (e.g. from Xiaomi, Govee, or other sensors) using esp32_ble_tracker. However, there is no built-in component for advertising data using the BTHome protocol.

This enhancement would add a first-class bthome: component that:

Encodes sensor values into BTHome format

Optionally supports encryption using a shared key

Sends BTHome-compliant BLE advertisements periodically

This would allow ESP32 devices running ESPHome to act as BLE-only sensors, ideal for low-power, room presence, or air quality monitors — all interoperable with Home Assistant's native BTHome support.

Use cases

• Create BLE-only battery-powered ESPHome sensors (using ESP32-C3 or ESP32-H2)
• Avoid Wi-Fi to reduce power draw
• Interoperate with Home Assistant or any app supporting BTHome v2
• Enable ESPHome devices to participate in Open Home Foundation-compatible BLE ecosystems

Anything else?

• BTHome is developed by the same Open Home Foundation that stewards ESPHome and Home Assistant
• Spec: https://bthome.io/
• BTHome Python encoder (reference): https://github.com/basnijholt/bthome-ble
• Working ESP-IDF example (C-based encoder): https://github.com/atc1441/BTHome_ESP32
• Reference discussion on community interest: https://community.home-assistant.io/t/bthome-ble-esp32-transmitter-esphome/518773
• Could build on existing esp32_ble_advertising API or add a bthome: sensor platform for seamless YAML configuration

[nagyrobi]

https://github.com/afarago/esphome_component_bthome

[jesserockz]

This would be a new component: bthome / bthome_advertiser / bthome_advertisements

Please open a discusson in the correct category https://github.com/orgs/esphome/discussions/categories/new-components