arazzo: 1.0.1
info:
  title: Microsoft Windows 10 Bluetooth LE Read GATT Characteristic
  summary: Discover a paired BLE device, drill into its GATT services and characteristics, and read a characteristic value.
  description: >-
    A complete Bluetooth Low Energy read flow built on the
    Windows.Devices.Bluetooth GATT model. The workflow enumerates paired Low
    Energy devices, selects the first match, lists the GATT services exposed by
    that device, lists the characteristics of the first service, and then reads
    the value of the first characteristic. Every step inlines its request so the
    BLE traversal can be read and executed without opening the underlying
    OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: bluetoothApi
  url: ../openapi/microsoft-windows-10-bluetooth-openapi.yml
  type: openapi
workflows:
- workflowId: read-gatt-characteristic
  summary: Walk from a paired BLE device down to a single GATT characteristic value.
  description: >-
    Lists paired Low Energy Bluetooth devices, then chains the discovered device
    id, service uuid, and characteristic uuid through GATT service and
    characteristic enumeration before reading the characteristic value.
  inputs:
    type: object
    properties:
      cacheMode:
        type: string
        description: Whether to read the characteristic from cache or the device.
        enum:
        - Cached
        - Uncached
        default: Uncached
  steps:
  - stepId: listDevices
    description: >-
      Enumerate paired Low Energy Bluetooth devices and capture the first
      device id for the GATT traversal.
    operationId: listBluetoothDevices
    parameters:
    - name: type
      in: query
      value: LowEnergy
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      deviceId: $response.body#/0/id
      deviceName: $response.body#/0/name
  - stepId: listServices
    description: >-
      List the GATT services exposed by the selected BLE device and capture the
      first service uuid.
    operationId: listGattServices
    parameters:
    - name: deviceId
      in: path
      value: $steps.listDevices.outputs.deviceId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      serviceId: $response.body#/0/uuid
  - stepId: listCharacteristics
    description: >-
      List the characteristics of the first GATT service and capture the first
      characteristic uuid.
    operationId: listGattCharacteristics
    parameters:
    - name: deviceId
      in: path
      value: $steps.listDevices.outputs.deviceId
    - name: serviceId
      in: path
      value: $steps.listServices.outputs.serviceId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      characteristicId: $response.body#/0/uuid
      characteristicProperties: $response.body#/0/properties
  - stepId: readValue
    description: >-
      Read the value of the first characteristic and capture the read status and
      the base64-encoded value.
    operationId: readGattCharacteristic
    parameters:
    - name: deviceId
      in: path
      value: $steps.listDevices.outputs.deviceId
    - name: serviceId
      in: path
      value: $steps.listServices.outputs.serviceId
    - name: characteristicId
      in: path
      value: $steps.listCharacteristics.outputs.characteristicId
    - name: cacheMode
      in: query
      value: $inputs.cacheMode
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      readStatus: $response.body#/status
      value: $response.body#/value
  outputs:
    deviceId: $steps.listDevices.outputs.deviceId
    serviceId: $steps.listServices.outputs.serviceId
    characteristicId: $steps.listCharacteristics.outputs.characteristicId
    readStatus: $steps.readValue.outputs.readStatus
    value: $steps.readValue.outputs.value