Google Cloud Pub/Sub, publishing with a HTTP PUSH request

3
votes

I am trying to use google clouds pub/sub feature to store incoming data from an IOT device. I have an event call back which should be sending a JSON string to the pub/sub topic, from the IOT device's back-end. The callback looks like this (where {project},{topic} and {YOUR_API_KEY} are filled in as required: 

POST https://pubsub.googleapis.com/v1/projects/{project}/topics/{topic}:publish?key={YOUR_API_KEY}

{"messages":[{"data":"test"}]}

I am invariably getting error 403 with this set up. I have tried various slight variations on this and found other errors. I am very new to this topic, is there an obvious mistake I am making?

1
google-cloud-pubsub

1 Answers

0
votes

API Keys are not sufficient for authenticating to the Google Cloud Pub/Sub API. Only a subset of GCP services allow access using only an API key, as detailed in the Using API Keys documentation. You will need to use a service account to authenticate for using Cloud Pub/Sub. You might also want to consider Google Cloud IoT, which sends telemetry into Cloud Pub/Sub.