Re: [lwip-users] tcp_write() keeps returning ERR_MEM indefinitely once the buffer is filled

[Diecol]

Thanks a Lot

I got it.. I did with tcp_sent() out of tcp_rcv!
Now is working better than I could imagine

my troughput is 20x more thatn with uIP

Thanks again, 

Diego


Kieran Mansley wrote:
> 
> On Mon, 2010-12-13 at 02:57 -0800, Diecol wrote:
>> Can u do a example code?
> 
> I'd have a look in the contrib module for examples using the raw API.
> 
> The code that you posted that sits in a tight loop if it gets ERR_MEM
> trying smaller and smaller writes is not a good approach.   If you get
> ERR_MEM you have two choices:
> 1) Try again but send less data: you can use tcp_snd_buf() to find out
> how much space there is.
> 2) Wait until later when there is more space: you can use tcp_sent() to
> ask for a callback when there is more space.
> 
> Both of these are described in the rawapi document.
> 
> You also mentioned in an earlier email getting ERR_CONN sometimes.  I
> would look into that as it seems a bit odd.
> 
> Good luck!
> 
> Kieran
> 
> 
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