Firedog I. wrote:
I'm using lwIP v1.31 with an 72MHz Cortex M3 Processor and 64kB RAM. I
need to write small 10-35bit messages as fast as possible through
ethernet. I've set up a timer to 50ms, the timer interrupt executes a
tcp_write and a tcp_output.
My problem is that every outgoing Message, when writing 26bit data to
tcp_write and tcp_output, has in the end four data-packets as payload,
therefore 104bits, but i want to send every 50ms one single tcp packet
with 26bit. When sending out the message every 300ms, everything works
well.
That's a common TCP beginner's issue: you should disable the nagle
algorithm (see wikipedia if you want to know more). With the TCP raw
API, call tcp_nagle_disable(). Although I do not know if that's already
available in 1.3.1 (which isn't really what I would call up-to-date...).
Simon
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