Jira 916 913 BLESubscribed, BLEUnsubscribed Event Handlers are not called

[sgbihu]

1. Implement the subscribe changed event notify feature.

Changed files: BLECallbacks.cpp - Add subscribe changed handler and disconnect process BLECallbacks.h - Callback declaration BLECharacteristicImp.cpp - Add the event changed handler BLECharacteristicImp.h - Handler declaration

#531

[russmcinnis]

@SidLeung @sgbihu The subscribe and unsubscribe events are now generated on the peripheral. When unsubscribing the central is calling if (!ledCharacteristic.unsubscribe()) { This is returning false even though the peripheral is seeing the unsubscribe. I will file a jira.

[SidLeung]

@sgbihu Please check into the case in Central mode.

https://jira.ndg.intel.com/browse/ATLEDGE-916

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