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• Group ID

  • This identifies a logical grouping of Edge nodes and devices. This can be a region, a facility name, or any meaningful grouping of Edge Nodes within your application.

• Verb
  • This provides an indication on how to handle the payload of the message. This includes whether the message is a birth certificate, death certificate, data message, command message, etc.
  • Options include

    NBIRTH: Edge node BIRTH certificate. This is a startup message from an Edge node to announce its presence and , share its configurations . and it indicates the beginning of a Sparkplug session.

    • If Ignition User Defined Types (UDTs) are being used, definitions are included in NBIRTH messages 

    NDEATH: Notification of an edge node’s disconnection or failure. This indicates the end of a Sparkplug session.

    DBIRTH: Device BIRTH certificate. This is a startup message from a device to announce its presence and share its configurations.

    DDEATH: Notification of a device’s disconnection or failure.

    NDATA: Data messages from an edge node which include edge node metric data.

    DDATA: Data messages from a device which include device metrics.

    NCMD: Command to an edge node.

    • Also used for REBIRTH requests to an edge node 

    DCMD: Command to a device.

    STATE: It represents the state of the primary host application. Edge nodes subscribe to it to get the online status of the host.

• Edge Node ID
  • The ID of the logical Edge Node. This is often the name of the system running Ignition with MQTT Transmission or Injectors.
• Device ID (Optional)
  • The ID of a device attached to the Ignition instance. This can be a PLC or logical grouping of tags that represent a physical or logical device connected to Ignition.

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