Re: [lwip-users] tcp_write

[Kieran Mansley]

On Wed, Jul 05, 2006 at 11:40:43PM -0700, Jonas L wrote:
> 
> I'm trying to send a chain of data using tcp_write. It seems like when I call
> tcp_write twice bad things happen. Packet is never transmitted though both
> calls return with ERR_OK.
> 
> That means that the only way to send data that is not in one piece is to
> send a small piece, wait for it to transmit then call tcp_write again when
> the first part is away.
> 
> Is this normal, and is there any solution except copying to one piece?

You need to call tcp_output() after tcp_write() to try to put the data
on the wire.  It may not always be able to (no TCP window for example)
so you may need to try again later.

Kieran