Is there a presence event associated with my Greengrass v2 lambda component?

Question

We are in the process of migrating from Greengrass v1 to v2.

With Greengrass v1 we were getting specific presence events when the lambda component was deployed, namely `$aws/events/presence/connected/ThingName-c00` and respectively `$aws/events/presence/disconnected/ThingName-c00`. 
In addition to those we were getting specific presence events for Greengrass connection, namely `$aws/events/presence/connected/ThingName` and respectively `$aws/events/presence/disconnected/ThingName`

We were using these in order to assess that the lambda is deployed or merely Greengrass running.

With Greengrass v2 we are only getting the latter set of presence events.

Is there a similar way to assess that the deployment of the lambda is successful with Greengrass v2?

Our lambda component is configured with a PUB_SUB event source like below:

"eventSources": [
        {
          "type": "PUB_SUB",
          "topic": "$aws/things/{iot:thingName}/shadow/update/delta"
        }
      ]

Accepted Answer

Hello,

Lambda in V1 never had any presence events. Both of the events that you're talking about for thingname and thingname-c00 are from Greengrass itself and has nothing to do with your lambda running or not running. Greengrass V1 always had 2 MQTT connections named for the thing name and thing name with c00.

Greengrass V2 has only 1 MQTT connection which is named with the thing name.

If you want to check if your deployment is successful, then simply check the deployment status, not MQTT presence. https://awscli.amazonaws.com/v2/documentation/api/latest/reference/greengrassv2/get-deployment.html

Cheers,

Michael

Is there a presence event associated with my Greengrass v2 lambda component?

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