can't subscribe to AWS IoT FleetWise topic.

Question

Hello AWS people.
I set my IoT Core Policy like this.

```
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "iot:Connect"
      ],
      "Resource": [
        "arn:aws:iot:us-east-1:ACCOUNT:client/${iot:Connection.Thing.ThingName}"
      ]
    },
    {
      "Effect": "Allow",
      "Action": [
        "iot:Publish"
      ],
      "Resource": [
        "arn:aws:iot:us-east-1:ACCOUNT:topic/$aws/iotfleetwise/vehicles/${iot:Connection.Thing.ThingName}/checkins",
        "arn:aws:iot:us-east-1:ACCOUNT:topic/$aws/iotfleetwise/vehicles/${iot:Connection.Thing.ThingName}/signals"
      ]
    },
    {
      "Effect": "Allow",
      "Action": [
        "iot:Subscribe"
      ],
      "Resource": [
        "arn:aws:iot:us-east-1:ACCOUNT:topicfilter/$aws/iotfleetwise/vehicles/${iot:Connection.Thing.ThingName}/collection_schemes",
        "arn:aws:iot:us-east-1:ACCOUNT:topicfilter/$aws/iotfleetwise/vehicles/${iot:Connection.Thing.ThingName}/decoder_manifests"
      ]
    },
    {
      "Effect": "Allow",
      "Action": [
        "iot:Receive"
      ],
      "Resource": [
        "arn:aws:iot:us-east-1:ACCOUNT:topic/$aws/iotfleetwise/vehicles/${iot:Connection.Thing.ThingName}/collection_schemes",
        "arn:aws:iot:us-east-1:ACCOUNT:topic/$aws/iotfleetwise/vehicles/${iot:Connection.Thing.ThingName}/decoder_manifests"
      ]
    }
  ]
}
```

But I can't subscribe checkins and signals topic at AWS IoT Core MQTT Client CONSOLE.
![여기에 이미지 설명 입력](/media/postImages/original/IM9oBeEQyBTV2VfDTadRSh1A)

What should I solve this problem?

Accepted Answer

The `checkin` and `signals` topics are specific to the FleetWise service and and cannot be subscribed by clients. That's why the IoT Policy only allows a vehicle (FWE) to publish to them. As the details are to provide FleetWise with status of the vehicle (checkin) and the signal telemetry (signals), what are you looking to do with the data? Understanding that will help get a resolution for you.

Answer

Has the vehicle been provisioned?

I assumed from the error message that the reserved topic might not exist.

https://docs.aws.amazon.com/iot-fleetwise/latest/developerguide/provision-vehicles.html

Answer

I created Thing through  in AWS IoT Core console. Then, I put in the correct policy, and moved the certificate safely to the vehicle. If there was an authentication issue with my Thing, FWE would not have been installed in my vehicle. But I checked that FWE was installed and working properly. The question is, why can't I subscribe to only `checkins` and `signals` topics? I can subscribe to `decoder_manifests` and `collection_schemes` topics, and I could also see which messages were published. What's the problem? I really want to solve this problem. Please help me...

can't subscribe to AWS IoT FleetWise topic.

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