https://github.com/GoogleCloudPlatform/python-docs-samples/blob/master/iot/api-client/mqtt_example/cloudiot_mqtt_example.py

In the create_jwt function

The actual expiry token time of 60 minutes does not align with the comments for the code that say it is set to 20 minutes. Also does not align with the send_data_from_bound_device function in the same file that indicates jwt expiry should be using the jwt_expires_minutes parameter.

Suggested fix is to pass the jwt_expires_minutes parameter to create_jwt function to remove the inconsistencies.