List principals associated with a thing V2

To list the certificates associated with the specified thing, along with the attachment type, run the list-thing-principals-V2 command. The attachment type refers to how the certificate is attached to the thing.

$ aws iot list-thing-principals-v2 \
    --thing-name "thing_1"

The output can look like the following.

{
    "ThingPrincipalObjects": [
        {
            "thingPrincipalType": "NON_EXCLUSIVE_THING",
            "principal": "arn:aws:iot:us-east-1:123456789012:cert/2e1eb273792174ec2b9bf4e9b37e6c6c692345499506002a35159767055278e8"
        },
        {
            "thingPrincipalType": "NON_EXCLUSIVE_THING",
            "principal": "arn:aws:iot:us-east-1:123456789012:cert/1a234b39b4b68278f2e9d84bf97eac2cbf4a1c28b23ea29a44559b9bcf8d395b"
        }
    ]
}

For more information, see ListThingsPrincipalV2 from the Amazon IoT Core API Reference.