Adafruit CC3000 WiFi Breakout with uFL Connector for Ext Antenna - v1.1 is a CC3000 based wifi board with uFL connector. The microcontroller friendly WiFi modules produced so far were too slow, or too difficult to use, or required signing an NDA, or had limited functionality, or too expensive, or too large, but CC3000 hits that sweet spot of usability, price and capability. It uses SPI for communication instead of UART so you can push data as fast as you want or as slow as you want. It has a proper interrupt system with IRQ pin so you can have asynchronous connections. It supports 802.11b/g, open/WEP/WPA/WPA2 security, TKIP & AES. A built in TCP/IP stack with a "BSD socket" interface. Adafruit CC3000 WiFi Breakout with uFL Connector for Ext Antenna - v1.1 supports TCP and UDP in both client and server mode, up to 4 concurrent sockets. It does not support "AP" mode, it can connect to an access point but it cannot be an access point.
The module is carefully wrapped while Adafruit CC3000 WiFi Breakout with uFL Connector for Ext Antenna - v1.1 is produced. The board also has a microSD socket and a reset button. It has an onboard 3.3V regulator that can handle the 350mA peak current, and a level shifter to allow 3 or 5V logic level. The board does not have an onboard antenna, but there is an uFL connector to add an external antenna. The module should be used with a uFL to RP-SMA adapter cable and a 2.4GHz wifi antenna. Although the used layout is TI’s suggested layout, since the board has an external antenna, the module is not automatically FCC certified.
Adafruit Web Site: https://www.adafruit.com/products/1510