fix: after disconnect/connect, client twins should be pulled (#4629) #4669
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) Using mqtt broker upstream, after a disconnection to the parent device and connecting back, edge should pull the twin of the connected clients. This used to work by accident: there was a bug, which did not close existing cloud proxy objects, so they remained subscribed to connection events and forwarder those, so eventually twin manager received a notification that device_x regained its connection, which in turn pulled the twin. Fixing this bug removed the accidental event forwarding of the dead object, and because on losing the connection these objects are removed, nothing forwarded events to twin manager for the individual devices. This fix copies the solution of the legacy CloudConnection (ConnectToIotHub), which during proxy creation calls an explicit Open() method, which sends the notification about the device connected. (cherry picked from commit 794c324)
nyanzebra
approved these changes
Mar 24, 2021
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Using mqtt broker upstream, after a disconnection to the parent device and connecting back, edge should pull the twin of the connected clients. This used to work by accident: there was a bug, which did not close existing cloud proxy objects, so they remained subscribed to connection events and forwarder those, so eventually twin manager received a notification that device_x regained its connection, which in turn pulled the twin.
Fixing this bug removed the accidental event forwarding of the dead object, and because on losing the connection these objects are removed, nothing forwarded events to twin manager for the individual devices.
This fix copies the solution of the legacy CloudConnection (ConnectToIotHub), which during proxy creation calls an explicit Open() method, which sends the notification about the device connected.
(cherry picked from commit 794c324)