Inkbird_IHT_2PB.yaml

ble_client:
  - mac_address: !secret ble_mac_address
    id: inkbird_IHT_2PB_ble
    on_connect:
      then:
        - lambda: |-
            ESP_LOGD("ble_client_lambda", "Connected to BLE device");
            id(inkbird_IHT_2PB_connected).publish_state(true);
        # on_connect is triggered before the device is fully connected see https://github.com/esphome/issues/issues/4153
        # But even with a 10ms delay it doesn't seem to work. So the solution is to add a button that is pressed and start the script to activate
        # the notifications. This also allows the user to force the notifications manually.
        - button.press: inkbird_IHT_2PB_notification
    on_disconnect:
      then:
        - lambda: |-
            ESP_LOGD("ble_client_lambda", "Disconnected from BLE device");
            id(inkbird_IHT_2PB_connected).publish_state(false);

script:
  - id: activate_temperature_notifications
    then:
      - ble_client.ble_write:
          id: inkbird_IHT_2PB_ble
          service_uuid: 0000ffe0-0000-1000-8000-00805f9b34fb
          characteristic_uuid: 0000ffe9-0000-1000-8000-00805f9b34fb
          value: [0x55, 0xAA, 0x19, 0x01, 0x00, 0x19]
      - ble_client.ble_write:
          id: inkbird_IHT_2PB_ble
          service_uuid: 0000ffe0-0000-1000-8000-00805f9b34fb
          characteristic_uuid: 0000ffe4-0000-1000-8000-00805f9b34fb
          value: [0x55, 0xAA, 0x1A, 0x01, 0x00, 0x1A]
          # We get the error "Characteristic 0000FFE4-0000-1000-8000-00805F9B34FB does not allow writing"
          # but this write is necessary to get temperature notifications

switch:
  - platform: ble_client
    ble_client_id: inkbird_IHT_2PB_ble
    name: "Inkbird IHT-2PB enable"

button:
  - platform: template
    id: inkbird_IHT_2PB_notification
    name: "Inkbird IHT-2PB notification"
    on_press:
      - script.execute: activate_temperature_notifications

binary_sensor:
  - platform: template
    name: "Inkbird IHT-2PB connected"
    id: inkbird_IHT_2PB_connected
    icon: mdi:bluetooth-connect

sensor:
  - platform: template
    name: "Inkbird IHT-2PB probe manual"
    id: inkbird_IHT_2PB_probe0
    icon: mdi:thermometer-probe
    unit_of_measurement: "°C"
    accuracy_decimals: 1
    device_class: "temperature"
    state_class: "measurement"
  - platform: template
    name: "Inkbird IHT-2PB probe 1"
    id: inkbird_IHT_2PB_probe1
    icon: mdi:thermometer-probe
    unit_of_measurement: "°C"
    accuracy_decimals: 1
    device_class: "temperature"
    state_class: "measurement"
  - platform: template
    name: "Inkbird IHT-2PB probe 2"
    id: inkbird_IHT_2PB_probe2
    icon: mdi:thermometer-probe
    unit_of_measurement: "°C"
    accuracy_decimals: 1
    device_class: "temperature"
    state_class: "measurement"

  - platform: ble_client
    ble_client_id: inkbird_IHT_2PB_ble
    type: characteristic
    name: "Inkbird IHT-2PB last probe data"
    service_uuid: 0000ffe0-0000-1000-8000-00805f9b34fb
    characteristic_uuid: 0000ffe4-0000-1000-8000-00805f9b34fb
    notify: true
    lambda: |-
      if (x[2] != 2 && x[2] != 4 && x[2] != 6) {
        return -1.0;
      }
      uint8_t probeNr = x[2] / 2 - 1;
      float temperature;
      if (x[4] >= 254) {
          // negative
          temperature = (float) ((255 * (x[4] - 255)) + (x[5]-255)) / 10;
      } else if (x[4] <= 11){
          //positive
          temperature = (float) ((255 * x[4]) + x[5]) / 10;
      } else {
          return -1.0;
      }

      if (probeNr == 0) {
        id(inkbird_IHT_2PB_probe0).publish_state(temperature);
      } else if (probeNr == 1) {
        id(inkbird_IHT_2PB_probe1).publish_state(temperature);
      } else if (probeNr == 2) {
        id(inkbird_IHT_2PB_probe2).publish_state(temperature);
      }
      return (float)probeNr;