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+# NNN40 WI-FI SDK version 20150524, release at 2015/5/24
+This is the export repo for the WIFI_API provided by Delta Electronics, Inc.
+
+# Fixed bug in previous version
+* Fix wifi inti fail (timing issue) issue
+* Change type of ap_ssid and ap_pw to char*
+* Command getNetworkMask() and getGateway()  
+* Bug fix: is_connect() return 0 when close() function is called
+* Bug fix: listen() return 0
+* Change TCP ERROR retry to 3 times
+* WIFI SPI interface change to SPI0
+* WIFI MAC Address readout from Flash
+* UART conflict bug fix 
+* Fix is_connect return error when ethernet is disconnected
+* Set TCP maximum payload to 1400 bytes (Max. throughput achieve ~13.5KB)
+* Set UDP maximum payload to 1400 bytes (Max. throughput achieve ~35KB)
+* Fix UDP send_to length issue
+* Fix send_to return error when client socket is colsed
+* Set IP 255.255.255.255 as reserved
+* Fix Switch return error when ethernet is init
+* Fix bug in spi_flash.c for data access
+* Fix bind return error 
+
+# Fixed bug in this version
+* Support DNS client for TCP/UDP
+* Fast AP re-connection is performed automatically, user can call EthernetInterface.disconnect() to have lowest power consumption of 4uA, then call init and connected to previous AP for less than 4 sec
+
+# Supported functionalities 
+Currently supported  functionalities include:
+* IEEE 802.11 b/g/n connectivity
+* Station (STA) infrastructure mode
+* WEP/WPA/WPA2 security
+* DHCP Client and Static IPv4 addressing
+* TCP Server/Client
+* UDP Server/Client
+
+# Getting Started 
+This WIFI API is meant to be used on Delta NNN40 EVB. 
+A good starting point are these pages:
+* [WI-FI SDK User Guide](document come with WI-FI SDK deliver) for system overview, APIs summary and sample code
+* [EthernetInterface - Handbook](http://developer.mbed.org/handbook/Ethernet-Interface) a simple API that you will need to connect to the internet.
+* [Socket - Handbook](http://developer.mbed.org/handbook/Socket) a simple and consistent way to communicate using bsd-like TCP and UDP sockets over WI-FI 
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