Re: [sparkplug-wg] NDEATH usage for a none-persistent connected device

[Bryce Nakatani <bnakatani@xxxxxxxxxx>]

Reception of a node death (NDEATH) notifies the Sparkplug hosts to terminate the state of the edge node.

The NDEATH publication is required when your application has control of disconnecting the MQTT connection. This would apply in your case where your application no longer needs to maintain the connection to the broker.

In the case of an abrupt or an unexpected connection loss, the MQTT client can't publish anything to the broker. This is where the last will and testament NDEATH deposited in the MQTT Connect is published by the MQTT broker on behalf of the failed Edge Node's MQTT connection.

On Wed, Jun 26, 2024 at 10:20 PM wang ge via sparkplug-wg <sparkplug-wg@xxxxxxxxxxx> wrote:

Hi team,

I also have another question may need your help to clarify.

Per SparkPlug spec, the Edge Node need to register a NDEATH message as MQTT last will, when the device disconnected unintentionally,

the broker will send out the NDEATH message registered.

We had also looked into the spec, it also mentioned that the Edge Node need to send out a NDEATH message initiatively when trying to disconnect from the SparkPlug system.

So our question is, as an none-persistent connected device, should we send the NDEATH message or not to comply with the spec?

Thanks so much for your kindly help!

Best Regards,

Jimmy

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