[lwip-users] RAW LWIP TCP Client

[emseahays]

I'm an EE Student working on a project involving modification of example code
for Raw LWIP HTTP Server. I can repeatedly send the same packet when I reset
the board because it sets up one TCP connection and sends one packet.
However, since I've modified it to perform this same type of behavior on a
btn press (rather than reset btn), it is able to send 4 packets, then I
don't get the 2nd receive event (from the server closing the connection). 

I've been informed by a knowing person that I'm supposed to create a State
machine to keep track of the pcb state. Is that true? I just want to send
one packet per tcp connection. I wait until the server closes to call
tcp_close() but it seems there might be a timing issue because I receive
some acks late.

Using the LWIP_DEBUG functionality with the TCP_Options enabled, I have the
log for the 4 tcp connections from the 4 btn presses. 

I am including a link to the file showing the log. I have a very basic
understanding of TCP and internet stuff, so I marked it up to try to find
patterns. 

Can someone look at my log and tell me what they think?

Do I need to use the poll() event? I also don't do anything in my
errorHandler. Should I? Do I need a state machine to keep track of a single
tcp_pcb?

link to log is below(filename: TCP Debug Feature.mht).

http://s000.tinyupload.com/?file_id=06484156254841729160



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