sensor:
  - platform: template
    name: "Bathroom Scale"
    id: bathroom_scale
    unit_of_measurement: "kg"

esp32_ble_tracker:
  on_ble_service_data_advertise:
    - mac_address: 70:87:9E:11:22:33
      service_uuid: 181D
      then:
        - lambda: |-
            uint8_t  flags = x[0];
            bool     has_weight = (flags & (1 << 7)) == 0;
            bool     is_stable  = (flags & (1 << 5)) != 0;
            bool     unit_jin   = (flags & (1 << 4)) != 0;
            bool     unit_lb    = (flags & (1 << 2)) != 0;
            bool     unit_kg    = (flags & (1 << 1)) != 0;
            ESP_LOGD("scale", "Flags: %u has_weight=%u is_stable=%u unit: jin=%u lb=%u kg=%u", flags, has_weight, is_stable, unit_jin, unit_lb, unit_kg);

            uint16_t weight = (((uint16_t)x[2]) << 8) + x[1];
            double weight_f = (static_cast<double>(weight) / 100.0) / 2.0; // kg
            ESP_LOGD("scale", "Weight: raw=%x%x u16=%u kg=%f", x[1], x[2], weight, weight_f);

            if (has_weight && is_stable) {
              ESP_LOGI("scale", "Publish weight %f", weight_f);
              id(bathroom_scale).publish_state(weight_f);
            }