title: Verify the data has reached sent to GCP Pub/Sub
body: <p>We have a project which receives data from sensors and then we send this data to GCP. For this we have used GCP's Pub/Sub model. Issue here is when we pull the messages, they are not in ordered manner. So we are not able to verify that the data we have sent to GCP has reached there or not.
  Also GCP has mentioned that they don't guarantee the order of messages <a href="https://cloud.google.com/pubsub/docs/ordering" rel="nofollow noreferrer">https://cloud.google.com/pubsub/docs/ordering</a></p>
  <p>Any better way to verify this messages, other than the solutions recommended by GCP.</p>