PTC ThingWorx WebSocket/AlwaysOn API

asyncapi: 2.6.0
info:
  title: PTC ThingWorx AlwaysOn WebSocket API
  version: 9.5.0
  description: >-
    PTC ThingWorx AlwaysOn WebSocket API enables persistent bidirectional connections
    for industrial edge devices and remote assets. Supports real-time telemetry
    streaming, command and control, event notifications, and device lifecycle
    management over WebSocket transport using the ThingWorx AlwaysOn protocol.
  contact:
    name: PTC Support
    url: https://www.ptc.com/en/support
  license:
    name: PTC Software License
    url: https://www.ptc.com/en/legal-agreements

servers:
  thingworx-production:
    url: wss://{host}/Thingworx/WS
    protocol: wss
    description: ThingWorx WebSocket endpoint
    variables:
      host:
        default: thingworx.example.com

defaultContentType: application/json

channels:
  thing/property-update:
    description: Channel for receiving real-time property value updates from connected things
    subscribe:
      operationId: onPropertyUpdate
      summary: Real-time property value update
      description: >-
        Published when a thing property value changes and property change notification
        is enabled. Delivers the new value with timestamp and quality.
      tags:
        - name: Properties
      message:
        $ref: '#/components/messages/PropertyUpdateMessage'

  thing/event-fired:
    description: Channel for receiving real-time event notifications from things
    subscribe:
      operationId: onEventFired
      summary: Thing event notification
      description: >-
        Published when a thing fires an event (e.g., alert threshold crossed,
        state change, fault detected). Contains event name and associated data.
      tags:
        - name: Events
      message:
        $ref: '#/components/messages/EventFiredMessage'

  thing/alert:
    description: Channel for receiving alert notifications from things
    subscribe:
      operationId: onAlert
      summary: Thing alert notification
      description: >-
        Published when a thing triggers an alert condition based on a property
        value crossing a configured threshold.
      tags:
        - name: Alerts
      message:
        $ref: '#/components/messages/AlertMessage'

  device/connect:
    description: Channel for device connection lifecycle notifications
    subscribe:
      operationId: onDeviceConnect
      summary: Device connected event
      description: Published when an edge device establishes an AlwaysOn WebSocket connection.
      tags:
        - name: Devices
      message:
        $ref: '#/components/messages/DeviceConnectMessage'

  device/disconnect:
    description: Channel for device disconnection lifecycle notifications
    subscribe:
      operationId: onDeviceDisconnect
      summary: Device disconnected event
      description: Published when an edge device connection is terminated.
      tags:
        - name: Devices
      message:
        $ref: '#/components/messages/DeviceDisconnectMessage'

components:
  messages:
    PropertyUpdateMessage:
      name: PropertyUpdate
      title: Property Value Update
      contentType: application/json
      payload:
        $ref: '#/components/schemas/PropertyUpdatePayload'

    EventFiredMessage:
      name: EventFired
      title: Thing Event Fired
      contentType: application/json
      payload:
        $ref: '#/components/schemas/EventFiredPayload'

    AlertMessage:
      name: Alert
      title: Thing Alert
      contentType: application/json
      payload:
        $ref: '#/components/schemas/AlertPayload'

    DeviceConnectMessage:
      name: DeviceConnect
      title: Device Connected
      contentType: application/json
      payload:
        $ref: '#/components/schemas/DeviceConnectionPayload'

    DeviceDisconnectMessage:
      name: DeviceDisconnect
      title: Device Disconnected
      contentType: application/json
      payload:
        $ref: '#/components/schemas/DeviceConnectionPayload'

  schemas:
    PropertyUpdatePayload:
      type: object
      required:
        - thingName
        - propertyName
        - value
        - timestamp
      properties:
        thingName:
          type: string
          description: Name of the thing that reported the update
        propertyName:
          type: string
          description: Name of the updated property
        value:
          description: New property value
        timestamp:
          type: integer
          format: int64
          description: Value timestamp in epoch milliseconds (UTC)
        quality:
          type: string
          description: Data quality string (GOOD, BAD, UNCERTAIN)
          enum: [GOOD, BAD, UNCERTAIN]

    EventFiredPayload:
      type: object
      required:
        - thingName
        - eventName
        - timestamp
      properties:
        thingName:
          type: string
        eventName:
          type: string
        timestamp:
          type: integer
          format: int64
        eventData:
          type: object
          additionalProperties: true
          description: Event-specific data fields based on data shape

    AlertPayload:
      type: object
      required:
        - thingName
        - propertyName
        - alertName
        - alertType
        - timestamp
      properties:
        thingName:
          type: string
        propertyName:
          type: string
        alertName:
          type: string
        alertType:
          type: string
          enum: [Above, Below, Equal, NotEqual, AboveOrEqual, BelowOrEqual]
        isAcknowledged:
          type: boolean
        isCleared:
          type: boolean
        timestamp:
          type: integer
          format: int64
        value:
          description: Property value when alert triggered
        threshold:
          description: Configured threshold value

    DeviceConnectionPayload:
      type: object
      required:
        - thingName
        - timestamp
      properties:
        thingName:
          type: string
          description: Name of the connected/disconnected thing
        deviceId:
          type: string
          description: Physical device identifier
        timestamp:
          type: integer
          format: int64
        ipAddress:
          type: string
          nullable: true