The P4S-347-R2 (PHPoC Wi-Fi Shield 2 for Arduino) is a shield that connects Arduino to a wireless network. After attaching this shield on top of the Arduino and connecting the USB wireless dongle, you can connect Arduino to the Internet by simply setting up the network.
The network function of this shield is based on the TCP/IP stack using PHPoC interpreter. The shield can be easily accessed by PHPoC Library. PHPoC Library is very similar to the usage of Arduino Ethernet library. Therefore, source codes using existing Ethernet library can be used immediately after modifying just few lines. Furthermore, Phpoc Library has a wider range of applications since it supports a variety of API(TELNET, Web socket and ESMTP).
Unlike the existing PHPoC Wi-Fi Shield (P4S-347), the P4S-347-R2 is equipped with an SPC port for communication with the Smart Expansion Boards for Shield 2, which provides a wide range of applications.