AWS IoT Fleet Provisioning doesn't publish certificate response

Question

Good afternoon,  
  
I have created a fleet provisioning template but when I publish to "$aws/certificates/create/json" the IoT backend does not publish a response.  
  
Region: us-east-2  
Cloudwatch log output: (trimmed)  
EVENT:MQTT Client Connect MESSAGE:Connect Status: SUCCESS  
EVENT:MQTTClient Subscribe TOPICNAME:$aws/certificates/create/json/accepted MESSAGE:Subscribe Status: SUCCESS  
EVENT:MQTTClient Subscribe TOPICNAME:$aws/certificates/create/json/rejected MESSAGE:Subscribe Status: SUCCESS  
EVENT:PublishEvent TOPICNAME:$aws/certificates/create/json MESSAGE:PublishIn Status: SUCCESS  
EVENT: CreateKeysAndCertificate Status: SUCCESS MESSAGE: Successfully created keys and certificate with id xxx  
  
I would expect this to be followed by a PublishOut event. I can verify that the certificate is generated and pending activation but my client never gets a response.  
  
Please let me know how to solve this issue.

Answer

Finally figured it out, you need to set a client ID and have a non-zero client ID length in your connection packet to the broker.  
If the client ID length is zero the broker should generate a random client ID, which judging by the logs it does correctly (Eg: '$GEN/a5e20039-82c0-4069-a0ff-9a86d8dd2b03') but the backend does not publish a certificate creation response

Answer

I was having the same issue and it was driving me crazy. Thanks for the solution!

AWS IoT Fleet Provisioning doesn't publish certificate response

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