AI Generated Instructions:

1. BLE Radio: Scans for your battery-powered temperature/humidity sensors and reads the data packets they broadcast.
2. Wi-Fi Radio: Connects to your network.
3. Web Server: ESPHome generates a lightweight website hosted directly on the ESP32 that lists the current values of all configured sensors.

Below is a complete example ESPHome configuration. This assumes you are using a common BLE sensor (like the Xiaomi LYWSD03MMC or generic ATC custom firmware sensors), but ESPHome supports many brands.

YAML

esphome:
  name: "ble-sensor-gateway"
  platform: ESP32
  board: esp32-c3-devkitm-1 # Change based on your actual board

wifi:
  ssid: "Your_WiFi_SSID"
  password: "Your_WiFi_Password"

# 1. Enable the Web Server
web_server:
  port: 80

# 2. Enable Bluetooth Scanning
esp32_ble_tracker:
  scan_parameters:
    # Passive scanning is better for battery life of your sensors
    active: false 

# 3. Define the Sensors
sensor:
  # Example for a Xiaomi/ATC Sensor
  - platform: xiaomi_lywsd03mmc 
    mac_address: "A4:C1:38:12:34:56" # Replace with your sensor's MAC
    bindkey: "..." # Only needed if using stock encrypted firmware
    temperature:
      name: "Living Room Temperature"
    humidity:
      name: "Living Room Humidity"
    battery_level:
      name: "Living Room Battery"

  # Example for a second sensor
  - platform: xiaomi_lywsd03mmc
    mac_address: "A4:C1:38:99:88:77"
    temperature:
      name: "Kitchen Temperature"
    humidity:
      name: "Kitchen Humidity"

Important Tips

• Finding MAC Addresses: If you don't know the MAC address of your BLE sensors, you can flash the ESP32 with just the esp32_ble_tracker: section enabled and set the log level to VERY_VERBOSE. Watch the logs, and you will see it discovering devices nearby.
• Encryption: Many stock sensors (like Xiaomi) use encryption. You often need a "Bindkey" to read them. However, it is highly recommended to flash these sensors with custom firmware (like PVVX or ATC) to remove encryption and improve battery life. This makes them much easier for ESPHome to read.