初始化版本

lwip/lwip-2.2.1/contrib/apps/chargen/README

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+
+        CHARGEN
+        
+This file implements a nice example of handling multiple tcp sockets in a
+server environment. Just call chargen_init() from your application after
+you have initialized lwip and added your network interfaces. Change the
+MAX_SERV option to increase or decrease the number of sessions supported.
+
+chargen will jam as much data as possible into the output socket, so it
+will take up a lot of CPU time. Therefore it will be a good idea to run it
+as the lowest possible priority (just ahead of any idle task).
+ 
+This is also a good example of how to support multiple sessions in an
+embedded system where you might not have fork(). The multiple sessions are
+all handled by the same thread and select() is used for demultiplexing.
+ 
+No makefile is provided, just add chargen to the makefile for your
+application. It is OS and HW independent.
+
+Once the chargen server is running in your application, go to another system
+and open a telnet session to your lwip platform at port 19. You should see an
+ASCII pattern start to stream on you screen.
+
+As an example, lets say that your system running lwip is at IP address
+192.168.10.244 and you have a linux system connected to it at IP address
+192.168.10.59. Issue the following command at a terminal prompt on the linux system:
+
+telnet 192.168.10.244 19
+
+You will see a pattern similar to the following on streaming by on your
+screen:
+
+ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{
+BCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|
+CDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}
+DEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
+EFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~!
+FGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~!"
+GHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~!"#
+HIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~!"#$
+IJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~!"#$%
+JKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~!"#$%&
+KLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~!"#$%&'
+LMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~!"#$%&'(
+
+It even works from windows: At a dos prompt you can also issue the same
+telnet command and you will get a similar (but much slower, at least on W98)
+data stream.
+
+David Haas
+
+