Greengrass V2 Shadow Manager Manage all assigned devices

Question

While setting up ShadowManager + MQTT Bridge + Moquette, we have the desire to configure the ShadowManager to manage all shadows for devices under its control.

> By "under its control", I mean the devices you see listed if you go to **Greengrass devices** > **Core devices** > [MY GG DEVICE] > **Client devices** > **Associated client devices**

It looks like, right now, it will only sync from Greengrass-Instance -> Cloud on a "wildcard" basis (any shadow topic that pops up on the Moquette broker is automatically synced to the local shadow service regardless whether it's in the ShadowManager config), but wont necessarily sync all shadows from the Cloud -> Greengrass-Instance. We don't need _all_ shadows, but would like to have the ShadowManager keep the assigned devices to it in-sync without having to call them out in the general group-deployment.

We're currently targeting Greengrass deployments at Groups rather than individual Greengrass-Instances, so configuring the ShadowManager during deployment wont work since each Greengrass-Instances in the group will have different device assignments. I think the workaround will be to create a union of thing-ids and just have all Greengrass-Instances under a group sync that superset.

Is there a better way to do this?

Accepted Answer

Hi Casey,

as you mention, the cloud to ShadowManager edge sync is based purely on the configuration of the ShadowManager component. You could do as you point out, include all possible DeviceId in the Shadow Manager configuration but that will imply: 1/ all Greengrass Cores sync all the shadows with an impact on local storage 2/ depending on the number of devices you might hit a deployment document size limit

My suggestion would be to deploy just the ShadowManager component using each core device as target. In this way each configuration can be tailored to reflect the devices which are attached to the Greengrass Core device. I would recommend to implement some automatic logic to manage these deployments.

I also encourage you to create a feature request in https://github.com/aws-greengrass/aws-greengrass-shadow-manager.

Cheers,

Massimiliano

Greengrass V2 Shadow Manager Manage all assigned devices

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