MTConnect.NET-MQTT 6.2.0-beta

MTConnect.NET-MQTT

MTConnect.NET-MQTT is an extension library to MTConnect.NET that provides an MQTT Broker & Client interface to an IMTConnectAgentBroker interface.

Updated for Version 6

Topic Structures

Document - Topics are the same as HTTP (Probe, Current, Sample, & Assets). Payloads are the corresponding MTConnect Response Documents. This provides a simple protocol that is performance based for applications with high frequency updates.

Entity - Topics are expanded where each Entity has it's own topic. This provides an easy to read interface for tools such as NodeRed, etc.

Document Topic Structure

Entity Topic Structure

Devices

The MTConnect/Devices topics are used to send data that is in an MTConnectDevicesResponse document.

MTConnect/Devices/[DEVICE_UUID]/Device

Device Observations

Observations may use the MTConnectMqttFormat.Flat or MTConnectMqttFormat.Hierarchy option to specify how the topics are structured.

MTConnectMqttFormat.Flat Format:

MTConnect/Devices/[DEVICE_UUID]/Observations/[DATA_ITEM_ID]

MTConnectMqttFormat.Hierarchy Format:

MTConnect/Devices/[DEVICE_UUID]/Observations/[COMPONENT_TYPE]/[COMPONENT_ID]/[DATA_ITEM_CATEGORY]/[DATA_ITEM_TYPE]/[DATA_ITEM_ID]
MTConnect/Devices/[DEVICE_UUID]/Observations/[COMPONENT_TYPE]/[COMPONENT_ID]/[DATA_ITEM_CATEGORY]/[DATA_ITEM_TYPE]/SubTypes/[DATA_ITEM_SUBTYPE]/[DATA_ITEM_ID]

The "Flat" format is typically used for brokers that limit the topic depth (number of forward slash "/" characters). For example, AWS IoT Core.

Device Condition Observations

Condition messages are sent as an array of Observations since a Condition may have multiple Fault States. This is similar to how the Current request functions in an HTTP Agent.

Device Assets

MTConnect/Devices/[DEVICE_UUID]/Assets/[ASSET_TYPE]/[ASSET_ID]

Topic Structure (MTConnectMqttFormat.Flat)

[Node] = (Payload)

- MTConnect
   ─ Devices
      ─ [DEVICE_UUID]
        - Device = (JSON)
        - Observations
          - [DATA_ITEM_ID] = (JSON Array)
          - [DATA_ITEM_ID] = (JSON Array)
          - [DATA_ITEM_ID] = (JSON Array)
        - Assets
          - [ASSET_TYPE]
            - [ASSET_ID] = (JSON)

Example

- MTConnect
   ─ Devices
      ─ OKUMA.Lathe.123456
        - Device
        - Observations
          - L2avail = {"dataItemId":"L2avail","name":"avail","type":"AVAILABILITY","timestamp":"2023-02-07T20:02:26.8978653Z","result":"AVAILABLE"}
          - L2estop = {"dataItemId":"L2estop","name":"estop","type":"EMERGENCY_STOP","timestamp":"2023-02-07T20:02:26.8978653Z","result":"ARMED"}
          - L2p1execution = {"dataItemId":"L2p1execution","name":"p1execution","type":"EXECUTION","timestamp":"2023-02-07T20:02:26.7671421Z","result":"UNAVAILABLE"}
          - L2p1system = [{"level":"WARNING","dataItemId":"L2p1system","name":"p1system","type":"SYSTEM","timestamp":"2023-02-07T20:30:16.8639659Z","result":"Not Found","nativeCode":"404"},{"level":"FAULT","dataItemId":"L2p1system","name":"p1system","type":"SYSTEM","timestamp":"2023-02-07T20:30:38.9662297Z","result":"Interval Error","nativeCode":"500"}]         
        - Assets
          - CuttingTool
            - 5.12 = {"assetId":"5.12","type":"CuttingTool","timestamp":"2023-02-07T13:36:04.7288143Z","deviceUuid":"OKUMA.Lathe.123456","serialNumber":"12345678946","toolId":"12","cuttingToolLifeCycle":{"cutterStatus":["AVAILABLE","NEW","MEASURED"],"location":{"type":"SPINDLE"},"programToolGroup":"5","programToolNumber":"12","measurements":[{"type":"FunctionalLength","value":7.6543,"units":"MILLIMETER","code":"LF"},{"type":"CuttingDiameterMax","value":0.375,"units":"MILLIMETER","code":"DC"}]}}

Topic Structure (MTConnectMqttFormat.Hierarchy)

[Node] = (Payload)

- MTConnect
   ─ Devices
      ─ [DEVICE_UUID]
        - Device = (JSON)
        - Observations
          - [COMPONENT_TYPE]
            - [COMPONENT_ID]
              - Events
                - [DATA_ITEM_TYPE]
                  - [DATA_ITEM_ID] = (JSON)
                  - SubTypes
                    - [DATA_ITEM_SUBTYPE]
                      - [DATA_ITEM_ID] = (JSON)
              - Samples
                - [DATA_ITEM_TYPE]
                  - [DATA_ITEM_ID] = (JSON)
              - Conditions
                - [DATA_ITEM_TYPE]
                  - [DATA_ITEM_ID] = (JSON Array)
        - Assets
          - [ASSET_TYPE]
            - [ASSET_ID] = (JSON)

Example

- MTConnect
   ─ Devices
      ─ OKUMA.Lathe.123456
        - Device
        - Observations
          - Device
            - OKUMA.Lathe
              - Events
                - AVAILABILITY
                  - L2avail = {"dataItemId":"L2avail","name":"avail","type":"AVAILABILITY","timestamp":"2023-02-07T20:02:26.8978653Z","result":"AVAILABLE"}
                - ASSET_CHANGED
                  - OKUMA.Lathe_assetCount = {"dataItemId":"OKUMA.Lathe_assetCount","name":"assetCount","type":"ASSET_COUNT","timestamp":"2023-02-07T20:02:26.7671421Z","result":"UNAVAILABLE","count":0}
          - Controller
            - L2ct1
              - Events
                - EMERGENCY_STOP
                  - L2estop = {"dataItemId":"L2estop","name":"estop","type":"EMERGENCY_STOP","timestamp":"2023-02-07T20:02:26.8978653Z","result":"ARMED"}
          - Path
            - L2p1
              - Events
                - EXECUTION
                  - L2p1execution = {"dataItemId":"L2p1execution","name":"p1execution","type":"EXECUTION","timestamp":"2023-02-07T20:02:26.7671421Z","result":"UNAVAILABLE"}
              - Conditions
                - SYSTEM
                  - L2p1system = [{"level":"WARNING","dataItemId":"L2p1system","name":"p1system","type":"SYSTEM","timestamp":"2023-02-07T20:30:16.8639659Z","result":"Not Found","nativeCode":"404"},{"level":"FAULT","dataItemId":"L2p1system","name":"p1system","type":"SYSTEM","timestamp":"2023-02-07T20:30:38.9662297Z","result":"Interval Error","nativeCode":"500"}]
              - Samples
                - PATH_FEEDRATE
                  - SubTypes
                    - ACTUAL
                      - L2p1Fact = {"dataItemId":"L2p1Fact","name":"p1Fact","type":"PATH_FEEDRATE","subType":"ACTUAL","timestamp":"2023-02-07T20:02:26.7671421Z","result":"UNAVAILABLE"}
        - Assets
          - CuttingTool
            - 5.12 = {"assetId":"5.12","type":"CuttingTool","timestamp":"2023-02-07T13:36:04.7288143Z","deviceUuid":"OKUMA.Lathe.123456","serialNumber":"12345678946","toolId":"12","cuttingToolLifeCycle":{"cutterStatus":["AVAILABLE","NEW","MEASURED"],"location":{"type":"SPINDLE"},"programToolGroup":"5","programToolNumber":"12","measurements":[{"type":"FunctionalLength","value":7.6543,"units":"MILLIMETER","code":"LF"},{"type":"CuttingDiameterMax","value":0.375,"units":"MILLIMETER","code":"DC"}]}}

Assets

MTConnect/Assets/[ASSET_TYPE]/[ASSET_ID]

Note: Assets are sent to two topics. One for the "Global" assets and one for the Device that the Asset was added to

Topic Structure

[Node] = (Payload)

- MTConnect
   ─ Assets
      ─ [ASSET_TYPE]
        - [ASSET_ID] = (JSON)

Example

- MTConnect
  - Assets
      - CuttingTool
      - 5.12 = {"assetId":"5.12","type":"CuttingTool","timestamp":"2023-02-07T13:36:04.7288143Z","deviceUuid":"OKUMA.Lathe.123456","serialNumber":"12345678946","toolId":"12","cuttingToolLifeCycle":{"cutterStatus":["AVAILABLE","NEW","MEASURED"],"location":{"type":"SPINDLE"},"programToolGroup":"5","programToolNumber":"12","measurements":[{"type":"FunctionalLength","value":7.6543,"units":"MILLIMETER","code":"LF"},{"type":"CuttingDiameterMax","value":0.375,"units":"MILLIMETER","code":"DC"}]}}

More Information

More information can be found in the MQTT-Protocol document (https://github.com/TrakHound/MTConnect.NET/blob/master/docs/MQTT-Protocol.md).