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fixed subscription restore from client state when mqtt client reconnects #4189
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kodiakhq
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Azure:master
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vipeller:vipeller/mqtt_resubscribe_fix
Feb 22, 2021
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fixed subscription restore from client state when mqtt client reconnects #4189
kodiakhq
merged 8 commits into
Azure:master
from
vipeller:vipeller/mqtt_resubscribe_fix
Feb 22, 2021
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edge-hub/core/src/Microsoft.Azure.Devices.Edge.Hub.Core/device/DeviceMessageHandler.cs
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varunpuranik
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Change looks good. I am just concerned about all the async calls from sync context. Might be better to make it all async (with Tasks), and then call it from an async void method.
ancaantochi
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Feb 2, 2021
edge-hub/core/src/Microsoft.Azure.Devices.Edge.Hub.Amqp/ClientConnectionHandler.cs
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ancaantochi
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edge-hub/core/src/Microsoft.Azure.Devices.Edge.Hub.Mqtt/StringIdentity.cs
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ancaantochi
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edge-hub/core/src/Microsoft.Azure.Devices.Edge.Hub.Mqtt/StringIdentity.cs
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varunpuranik
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Feb 22, 2021
vipeller
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May 27, 2021
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…cts (#5048) Cherry picked (#4189) When an MQTT client used persistent session, the previous subscriptions did not get restored. If the same client connected to IoTHub directly, its subscriptions (e.g. for receiving twin responses) would have been restored. In case of c# sdk it would not be a problem, because the sdk automatically resubscribes when it is able to restore the connection to edgeHub. In case of python sdk however this does not happen. As a result, if a device connects using the python sdk and edgeHub gets restarted, the client will not be receiving m2m messages, twin patches, etc anymore. The fix seems big but the main code in "MessagingServiceClient.cs", the rest is just the result of a changed interface and some plumbing.
damonbarry
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Apr 15, 2022
…cts (Azure#4189) When an MQTT client used persistent session, the previous subscriptions did not get restored. If the same client connected to IoTHub directly, its subscriptions (e.g. for receiving twin responses) would have been restored. In case of c# sdk it would not be a problem, because the sdk automatically resubscribes when it is able to restore the connection to edgeHub. In case of python sdk however this does not happen. As a result, if a device connects using the python sdk and edgeHub gets restarted, the client will not be receiving m2m messages, twin patches, etc anymore. The fix seems big but the main code in "MessagingServiceClient.cs", the rest is just the result of a changed interface and some plumbing.
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When an MQTT client used persistent session, the previous subscriptions did not get restored. If the same client connected to IoTHub directly, its subscriptions (e.g. for receiving twin responses) would have been restored.
In case of c# sdk it would not be a problem, because the sdk automatically resubscribes when it is able to restore the connection to edgeHub.
In case of python sdk however this does not happen. As a result, if a device connects using the python sdk and edgeHub gets restarted, the client will not be receiving m2m messages, twin patches, etc anymore.
The fix seems big but the main code in "MessagingServiceClient.cs", the rest is just the result of a changed interface and some plumbing.