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IoT - Exponential backoff algorithm wait time calculation error #2242
Description
In which file did you encounter the issue?
python-docs-samples/iot/api-client/mqtt_example/cloudiot_mqtt_example.py
Describe the issue
Exponential backoff in above mentioned file doesn't follow algorithm described in link.
Variable minimum_backoff_time is referenced as global in all functions: listen_for_messages, send_data_from_bound_device and mqtt_device_demo.
But it does not get updated outside, which produces wait(delay) 1 to 2 seconds, not 1, 2, 4, 8 and 32 seconds.
Device client_id is 'projects/example_project_id/locations/europe-west1/registries/example_registry/devices/test_device'
Creating JWT using ES256 from private key file /home/dinko/keys/ec_private.pem
Subscribing to /devices/test_device/commands/#
Publishing message 1/100: 'example_registry/test_device-payload-1'
on_connect Connection Refused: not authorised.
on_disconnect 5: The connection was refused.
Waiting for 1.173 before reconnecting.
Minimum_backoff_time: 2
Publishing message 2/100: 'example_registry/test_device-payload-2'
on_connect Connection Refused: not authorised.
on_disconnect 5: The connection was refused.
Waiting for 1.09 before reconnecting.
Minimum_backoff_time: 2
Publishing message 3/100: 'example_registry/test_device-payload-3'
on_connect Connection Refused: not authorised.
on_disconnect 5: The connection was refused.
Waiting for 1.2 before reconnecting.
Minimum_backoff_time: 2
Publishing message 4/100: 'example_registry/test_device-payload-4'
on_connect Connection Refused: not authorised.
on_disconnect 5: The connection was refused.
Waiting for 1.6680000000000001 before reconnecting.
Minimum_backoff_time: 2
Publishing message 5/100: 'example_registry/test_device-payload-5'
on_connect Connection Refused: not authorised.
on_disconnect 5: The connection was refused.
Waiting for 1.7269999999999999 before reconnecting.
Minimum_backoff_time: 2
Publishing message 6/100: 'example_registry/test_device-payload-6'
on_connect Connection Refused: not authorised.
on_disconnect 5: The connection was refused.
Waiting for 1.289 before reconnecting.
Minimum_backoff_time: 2
Publishing message 7/100: 'example_registry/test_device-payload-7'
on_connect Connection Refused: not authorised.
on_disconnect 5: The connection was refused.
Waiting for 1.194 before reconnecting.
Minimum_backoff_time: 2
Version: Python 3.6.7
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gguuss commentedon Jul 25, 2019
Acknowledged, self assigning.
gguuss commentedon Aug 7, 2019
I'm not seeing this reproduce on my machine:
I'm using Python 3.7.4, if you have an example for how the device is failing to connect (e.g. expired credentials) and the issue still reproduces, feel free to reopen and I will be able to reproduce this and figure out where the backoff is not working.