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+# 4.0.0 Release Notes
+
+### API New Features & Breaking Changes
+* Updated to v4.0 RPCs and enums. 
+  * Enums updated:
+    * LayoutMode (Add and deprecate)
+    * AppInterfaceUnregisteredReason
+    * TextFieldName
+    * ImageFieldName
+    * VehicleDataResultCode
+    * KeyboardEvent
+    * RequestType
+  * RPCs updated
+    * TouchEvent - Changed timestamp (ts) to use Long instead of Integers
+    * HMICapabilities (new)
+    * RegisterAppInterface (response)
+    * PutFile (request) - Changed offset and length to use Long instead of Integers
+    * DialNumber (new - request, response)
+    * OnSystemRequest (notification) (Changed offset and length to use Long instead of Integers)
+* Removed unused classes StringEnumer, Base64, and utl/Mime
+* Removed unused methods including these public/protected methods:
+  * `com/smartDeviceLink/streaming/AbstractPacketizer` 
+    *     printBuffer(byte[],int,int)
+  * `com/smartDeviceLink/trace/Mime`
+    *     base64Decode(String)
+  * `com/smartDeviceLink/trace/SdlTrace`
+    *     setTracingEnable(Boolean) 
+* Moved TransportType enum to new package which will contain all new enums for the transport package, `com/smartDeviceLink/transport/enums`
+* Removed unused enums
+  * GearShiftAdviceStatus
+  * LightSwitchStatus
+  * MaintenanceModeStatus
+  * MessageType
+  * PermissionStatus
+  * TirePressureTellTale
+  * VehicleDataActiveStatus
+* Video/Audio streaming are now enabled. *[(See spec for more detail)](https://github.com/smartdevicelink/protocol_spec)*
+* Changed the USB metadata information to use SDL as the manufacturer and Core as the model
+
+
+### Enhancements
+* Modified generics to follow Java convention
+* Made FunctionID an enum rather than class with constants
+* Added more robust parameter checking
+* Changed some logging methods to return boolean for easier unit tests
+* Changed putFile building methods to accept Longs instead of ints. Old methods were deprecated.
+* Cleaned up SdlDataTypeConverter in terms of readability. 
+* MTU size increased to 128kb up from 1.5k for v4. This will be the expected MTU for this version.
+* Added a SDL Proxy builder that will enable simpler building of proxy objects as the large amount of constructors could be confusing.
+* Changed the outgoing message queues to actually be FIFO queues.
+* Heartbeat is now fully implemented which is needed for audio and video streaming. *[(See spec for more details)](https://github.com/smartdevicelink/protocol_spec).*
+* Device info will now automatically populate in the Register App Interface RPC.
+
+
+### Bugfixes
+* Fixed issue with onProxyClosed not always called in multiple session scenario
+* Removed recursion from HandleReceivedBytes
+* Fixed wrong key issue in UpdateTurnList during turn list retrieval
+* Fixed class cast exception caused by calling toArray from enums:
+  * FrameData
+  * FrameDataControlFrameType
+  * FrameType
+  * SessionType
+* Redirected deprecated methods to new methods when available for following classes: 
+  * GetVehicleData
+  * GetVehicleDataResponse
+  * OnVehicleData
+  * SubscribeVehicleData
+  * SubscribeVehicleDataResponse
+  * UnsubscribeVehicleData
+  * UnsubscribeVehicleDataResponse
+* Fixed incorrect naming conventions of variables (SdlTrace)
+* Fixed an issue RPC base classes that allowed for null values to be passed and cause issues with the underlying hashtable.
+* Fixed issue where different types of RPC’s (response, request, notification) could be used in their parent class (RPCMessage) state to create other children of that class. 
+* Fixed SendLocation to use Doubles instead of Floats for degrees
+* Fixed naming of SessionTypes to reflect spec and Sava naming conventions
+* Fixed ByteEnumer to catch class cast exceptions
+* Removed outdated logging.
+* Implemented missing callbacks for turn by turn RPCs.