Re: [lwip-users] doubt in sending TCP IP data

[Atte Kojo]

On Tuesday 20 December 2005 14:52, Prateek Jain wrote:
> Hi,
>
>   I am having a doubt in sending tcp ip data..I call tcp_write routine and
> write 4096 bytes of data. My TCP_MSS is 1024 and TCP_SND_BUF is 4096. After
> sending 1024 bytes of data, I get this log
>
> tcp_slowtmr: processing active pcb
> tcp_slowtmr: processing active pcb
> tcp_slowtmr: polling application
> tcp_output: nothing to send (00000000)
>
> That means pcb->unsent is NULL. But 3072 bytes are stilll remaining. Once
> it gets the ack for the previously sent data (1024), it sends the next data
> (remaining data).
>
> Any particular reson for it ? Why doesn't it send the remining 3072 bytes?

Could you provide an ethernet (or comparable) trace of the transaction. Also, 
have you defined any other TCP_* constants in lwipopt.h?

-- 
Atte Kojo
Software Development Engineer
Elekta Neuromag Oy
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