this is fork and i will modify for STM32

Fork of AWS-test by Pierre-Marie Ancèle

Revision:
0:cd5404401c2f
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+++ b/aws-iot/CHANGELOG.md	Wed Apr 12 14:07:09 2017 +0200
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+#Change Log
+## [2.1.1](https://github.com/aws/aws-iot-device-sdk-embedded-C/releases/tag/v2.1.1) (Sep 5, 2016)
+
+Bugfixes/Improvements:
+
+  - Network layer interface improvements to address reported issues
+  - Incorporated GitHub pull request [#41](https://github.com/aws/aws-iot-device-sdk-embedded-c/pull/41) 
+  - Bugfixes for issues [#36](https://github.com/aws/aws-iot-device-sdk-embedded-C/issues/36) and [#33](https://github.com/aws/aws-iot-device-sdk-embedded-C/issues/33)
+
+## [2.1.0](https://github.com/aws/aws-iot-device-sdk-embedded-C/releases/tag/v2.1.0) (Jun 15, 2016)
+
+New features:
+
+  - Added unit tests, further details can be found in the testing readme [here](https://github.com/aws/aws-iot-device-sdk-embedded-c/blob/master/tests/README.md)
+  - Added sample to demonstrate building the SDK as library
+  - Added sample to demonstrate building the SDK in C++
+
+Bugfixes/Improvements:
+
+  - Increased default value of Maximum Reconnect Wait interval to 128 secs
+  - Increased default value of MQTT Command Timeout in Shadow Connect to 20 secs
+  - Shadow null/length checks
+  - Client Id Length not passed correctly in shadow connect
+  - Add extern C to headers and source files, added sample to demonstrate usage with C++ 
+  - Delete/Accepted not being reported, callback added for delete/accepted
+  - Append IOT_ to all Debug macros (eg. DEBUG is now IOT_DEBUG)
+  - Fixed exit on error for subscribe_publish_sample
+
+## [2.0.0](https://github.com/aws/aws-iot-device-sdk-embedded-C/releases/tag/v2.0.0) (April 28, 2016)
+
+New features:
+
+  - Refactored API to make it instance specific. This is a breaking change in the API from 1.x releases because a Client Instance parameter had to be added to all APIs
+  - Added Threading library porting layer wrapper
+  - Added support for multiple connections from one application
+  - Shadows and connections de-linked, connection needs to be set up separately, can be used independently of shadow
+  - Added integration tests for testing SDK functionality
+
+Bugfixes/Improvements:
+
+  - Yield cannot be called again while waiting for application callback to return
+  - Fixed issue with TLS layer handles not being cleaned up properly on connection failure reported [here](https://github.com/aws/aws-iot-device-sdk-embedded-C/issues/16)
+  - Renamed timer_linux.h to timer_platform.h as requested [here](https://github.com/aws/aws-iot-device-sdk-embedded-C/issues/5)
+  - Adds support for disconnect handler to shadow. A similar pull request can be found [here](https://github.com/aws/aws-iot-device-sdk-embedded-C/pull/9)
+  - New SDK folder structure, cleaned and simplified code structure
+  - Removed Paho Wrapper, Merge MQTT into SDK code, added specific error codes
+  - Refactored Network and Timer layer wrappers, added specific error codes
+  - Refactored samples and makefiles
+  
+## [1.1.2](https://github.com/aws/aws-iot-device-sdk-embedded-C/releases/tag/v1.1.2) (April 22,  2016)
+
+Bugfixes/Improvements:
+
+  - Signature mismatch in MQTT library file fixed
+  - Makefiles have a protective target on the top to prevent accidental execution
+
+## [1.1.1](https://github.com/aws/aws-iot-device-sdk-embedded-C/releases/tag/v1.1.1) (April 1, 2016)
+
+Bugfixes/Improvements:
+
+  - Removing the Executable bit from all the files in the repository. Fixing [this](https://github.com/aws/aws-iot-device-sdk-embedded-C/issues/14) issue
+  - Refactoring MQTT client to remove declaration after statement warnings
+  - Fixing [this](https://forums.aws.amazon.com/thread.jspa?threadID=222467&tstart=0) bug
+ 
+
+## [1.1.0](https://github.com/aws/aws-iot-device-sdk-embedded-C/releases/tag/v1.1.0) (February 10, 2016)
+Features:
+
+  - Auto Reconnect and Resubscribe
+  
+Bugfixes/Improvements:
+
+  - MQTT buffer handling incase of bigger message
+  - Large timeout values converted to seconds and milliseconds
+  - Dynamic loading of Shadow parameters. Client ID and Thing Name are not hard-coded
+  - MQTT Library refactored
+
+
+## [1.0.1](https://github.com/aws/aws-iot-device-sdk-embedded-C/releases/tag/v1.0.1) (October 21, 2015)
+
+Bugfixes/Improvements:
+
+  - Paho name changed to Eclipse Paho
+  - Renamed the Makefiles in the samples directory 
+  - Device Shadow - Delete functionality macro fixed
+  - `subscribe_publish_sample` updated
+
+## [1.0.0](https://github.com/aws/aws-iot-device-sdk-embedded-C/releases/tag/v1.0.0) (October 8, 2015)
+
+Features:
+
+  - Release to github
+  - SDK tarballs made available for public download
+
+Bugfixes/Improvements:
+  - Updated API documentation
+ 
+## 0.4.0 (October 5, 2015)
+
+Features:
+
+  - Thing Shadow Actions - Update, Delete, Get for any Thing Name
+  - aws_iot_config.h file for easy configuration of parameters
+  - Sample app for talking with console's Interactive guide
+  - disconnect handler for the MQTT client library
+  
+Bugfixes/Improvements:
+
+  - mbedTLS read times out every 10 ms instead of hanging for ever
+  - mbedTLS handshake failure handled
+
+## 0.3.0 (September 14, 2015)
+
+Features:
+
+  - Testing with mbedTLS, prepping for relase
+
+Bugfixes/Improvements:
+
+  - Refactored to break out timer and network interfaces
+
+## 0.2.0 (September 2, 2015)
+
+Features:
+
+  - Added initial Shadow implementation + example
+  - Added hostname verification to OpenSSL example
+  - Added iot_log interface
+  - Initial API Docs (Doxygen)
+
+Bugfixes/Improvements:
+
+  - Fixed yield timeout
+  - Refactored APIs to pass by reference vs value
+
+## 0.1.0 (August 12, 2015)
+
+Features:
+
+  - Initial beta release
+  - MQTT Publish and Subscribe
+  - TLS mutual auth on linux with OpenSSL
+
+Bugfixes/Improvements:
+	- N/A