Changes in this update:
**Enhancements**
* Added support for [Bluetooth Interface 2.0](https://developer.amazon.com/docs/alexa/alexa-voice-service/bluetooth.html). This interface adds support for multiple simultaneous connections to Bluetooth peripherals.
* Added support for [Audio Focus Manager Library (AFML) Multi Activity](https://developer.amazon.com/docs/alexa/avs-device-sdk/sdk-interaction-model.html). This interface enhances the behavior of a device so it can handle more than one Activity per Channel.
* Added the `obfuscatePrivateData` logging method to help remove certain data from logs.
* Updated `MediaPlayerObserverInterface` to include metadata about playback states.
* Added SDK extension point. You can integrate CMake projects into the SDK without cloning those projects into a subdirectory.
**Bug fixes**
* Fixed Mac/OSX issue that caused an unresponsive Sample App when not connected to the internet.
* Fixed issue that prevented sample app from exiting various states.
* Fixed `UIManager` issue that caused an error in the logs when the device with built without the wake word enabled.
* Fixed volume issue that caused timers to ascend in volume when setting up ascending alarms.
* Fixed alert volume issue that caused any changes to the alert volume to notify observers.
* Fixed EQ issue where changes to the EQ band levels didn't notify observers.
* Fixed Bluetooth bug that caused short notification sounds from a connected phone to stop audio playback on the device.
**Known Issues**
* Build errors can occur on the Raspberry Pi due to incorrect linking of the atomic library. A suggested workaround is to add the following `set(CMAKE_CXX_LINK_FLAGS "${CMAKE_CXX_LINK_FLAGS} -latomic")` to the top most CMake file.
* The WebVTT dependency required for `captions` isn't supported for Windows/Android.
* Exiting from the setting option takes you back to the Options Menu directly. It doesn't provide a message to indicate that you're back in the main menu.
* Failing Unit Tests and AIP Unit tests are disabled on Windows
* `AudioInputProcessor` unit tests don't build on Windows when with the `-DCMAKE_BUILD_TYPE=DEBUG` cmake parameter.
* Music playback history isn't displayed in the Alexa app for certain account and device types.
* When using Gnu Compiler Collection 8+ (GCC 8+), `-Wclass-memaccess` triggers warnings. You can ignore these, they don't cause the build to fail.
* Android error `libDefaultClient.so not found` might occur. Resolve this by upgrading to ADB version 1.0.40.
* If a device loses a network connection, the lost connection status isn't returned though local TTS.
* ACL encounters issues if it receives audio attachments but doesn't consume them.
* Media streamed through Bluetooth might abruptly stop. To restart playback, resume the media in the source application or toggle next/previous.
* If a connected Bluetooth device is inactive, the Alexa app might indicates that audio is playing.
* The Bluetooth agent assumes that the Bluetooth adapter is always connected to a power source. Disconnecting from a power source during operation isn't yet supported.
* When using some products, interrupted Bluetooth playback might not resume if other content is locally streamed.
* `make integration` isn't available for Android. To run Android integration tests, manually upload the test binary and input file and run ADB.
* Alexa might truncate the beginning of speech when responding to text-to-speech (TTS) user events. This only impacts Raspberry Pi devices running Android Things with HDMI output audio.
* A reminder TTS message doesn't play if the sample app restarts and loses a network connection. Instead, the default alarm tone plays twice.
* `ServerDisconnectIntegratonTest` tests are disabled until they are updated to reflect new service behavior.
* The `DirectiveSequencerTest.test_handleBlockingThenImmediatelyThenNonBockingOnSameDialogId` test fails intermittently.
Changes in this update:
**Enhancements**
* `AuthDelegate` and `AuthServer.py` have been replaced by `CBLAUthDelegate`, which provides a more straightforward path to authorization.
* Added a new configuration property called [`cblAuthDelegate`](https://github.com/alexa/avs-device-sdk/blob/master/Integration/AlexaClientSDKConfig.json#L2). This object specifies parameters for `CBLAuthDelegate`.
* Added a new configuration property called [`miscDatabase`](https://github.com/alexa/avs-device-sdk/blob/master/Integration/AlexaClientSDKConfig.json#L34), which is a generic key/value database to be used by various components.
* Added a new configuration property called [`dcfDelegate`](https://github.com/alexa/avs-device-sdk/blob/master/Integration/AlexaClientSDKConfig.json#L17) This object specifies parameters for `DCFDelegate`. Within this object, values were added for the 'endpoint' and `overridenDcfPublishMessageBody`. 'endpoint' is the endpoint to connect to in order to send device capabilities. `overridenDcfPublishMessageBody`is the message that will get sent out to the Capabilities API. Note: values within the `dcfDelegate` object will only work in `DEBUG` builds.
* Added a new configuration property called [`deviceInfo`](https://github.com/alexa/avs-device-sdk/blob/master/Integration/AlexaClientSDKConfig.json#L9) which specifies device-identifying information for use by the Device Capability Framework (DCF), and for authorization (CBLAuthDelegate).
* Updated the Directive Sequencer to support wildcard directive handlers. This allows a handler for a given AVS interface to register at the namespace level, rather than specifying the names of all directives within that namespace.
* Updated the Raspberry Pi installation script to include `alsasink` in the configuration file.
* Added `audioSink` as a configuration option. This allows users to override the audio sink element used in `Gstreamer`.
* Added an interface for monitoring internet connection status: `InternetConnectionMonitorInterface.h`.
* The Alexa Communications Library (ACL) is no longer required to wait until authorization has succeeded before attempting to connect to AVS. Instead, `HTTP2Transport` handles waiting for authorization to complete.
* Added the Device Capabilities Framework (DCF) delegate. Device capabilities can now be sent for each capability interface using DCF publish messages.
* The sample app has been updated to send DCF publish messages, which will automatically occur when the sample app starts. Note: a DCF publish message must be successfully sent in order for communication with AVS to occur.
* The SDK now supports HTTP PUT messages.
* Added support for opt-arg style arguments and multiple configuration files. Now, the sample app can be invoked by either of these commands: `SampleApp <configfile> <debuglevel>` OR `SampleApp -C file1 -C file2 ... -L loglevel`.
**Bug Fixes**
* Issues [447](https://github.com/alexa/avs-device-sdk/issues/447) and [553](https://github.com/alexa/avs-device-sdk/issues/553) Fixed the `AttachmentRenderSource`'s handling of `BLOCKING` `AttachmentReaders`.
* Updated the `Logger` implementation to be more resilient to `nullptr` string inputs.
* Fixed a `TimeUtils` utility-related compile issue.
* Fixed a bug in which alerts failed to activate if the system was restarted without network connection.
* Fixed Android 64-bit build failure issue.
**Known Issues**
* The `ACL` may encounter issues if audio attachments are received but not consumed.
* `SpeechSynthesizerState` currently uses `GAINING_FOCUS` and `LOSING_FOCUS` as a workaround for handling intermediate state. These states may be removed in a future release.
* Some ERROR messages may be printed during start-up event if initialization proceeds normally and successfully.
* If an unrecoverable authorization error or an unrecoverable DCF error is encountered, the sample app may crash on shutdown.
* If a non-CBL `clientId` is included in the `deviceInfo` section of `AlexaClientSDKConfig.json`, the error will be reported as an unrecoverable authorization error, rather than a more specific error.
Caleigh Minshall
Michael Woo
Marco Visaya