Re: [lwip-users] Socket API send command packaging up data

[Sergio R. Caprile]

What you see is the Naggle algorithm.
It is the old trade off, delay or throughput. If your application
requires throughput, you want it. If you do need short delay, it can
usually be minimized by some configuration function/option.
The RAW API lets you tweak mostly at will, but the interface is not as
friendly as sockets and definitely not standard.
In all cases, the amount of bytes delivered at the other end is not
necessarily related to your calls to the API; though it can be tamed by
proper config and/or calling.
There are many threads in the list on this very subject, you can search
for some or wait for one of the gurus to give you some clues. For the
socket stuff, it is mostly standard.