EVB-B1+ WIZnet, EVB-B1+ Datasheet - Page 69

• Manufacturer Part Number: EVB-B1+
• Description: Development Boards & Kits - ARM W3150A+EVAL BOARD BASED ON AVR
• Manufacturer: WIZnet

Specifications of EVB-B1+

• Rohs: yes
• Product: Evaluation Boards
• Interface Type: RS-232, SPI
• Operating Supply Voltage: 3.3 V, 5 V
• Data Bus Width: 8 bit
• Dimensions: 50 mm x 40 mm
• Processor Series: ATmega128

<Fig 3.18: web_server()>
Since web_server() is TCP server program, it is built in the similar way as loopback_tcps() as explained in
Chapter
3.2.6.1. Difference between web_server() and loopback_tcps() is in the data communication codes.
web_server() calls proc_http() that processes HTTP request message from web browser at
SOCK_ESTABLISHED of the http socket.
After calling function proc_http(), it waits until the HTTP response message to HTTP request from web
browser, and then calls disconnect() to close the http socket.
This socket close is called Active Close and, in the case, EVB B/D requests the close to the client first. For
your reference, Passive Close is where client requests disconnection first. The reason why web server
program supports Active Close is that EVB B/D supports the connection with other clients.
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