Re: [lwip-users] flow of lwip as a stream client

[Simon Goldschmidt]

trex7 <address@hidden> wrote:
> >>I think that you should buffer the pbufs, and NOT call tcp_recved()
> >> until you consume a pbuf in your audio task.
> 
> Nice Idea but thats one of the purpose of the buffer, to buffer the stream
> so we can call tcp_recved as soon as possible so lwip can advertise a
> larger
> window.

That only makes sense if your private buffer is well bigger than the TCP 
window. In that case, only call tcp_recved() when you know you can add 
additional data to your buffer, i.e. when free_byte_in_buffer >= TCP_WINDOW.

If you use this "streaming client" only in internal networks, there might not 
be a problem with the unnecessary retransmissions I keep speaking of. However, 
when your device is connected to a more global network (like, say, the 
internet), unnecessary retransmissions should be avoided in any case. Also note 
that transmission speed is throttled on packet loss/retransmissions (as a 
feature of TCP).

Simon
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