On 7/19/2020 6:44 AM, Jon Bean wrote:
Hi
I have an application were I need to send around 4k of data using UDP.
What I would like to know is how I go about sending this using LWIP. I
can send small packets no problem. I first allocate a pbuf. Then copy
my data to the pbuf. Then send the data. But sending 4k of data doesnt
work. I realise that the Ethernet has a max payload of 1500 bytes. Is
there a different way to send large amounts of data? Do I need to
configure something and then do it the same way I have previously? I
am using a embedded TIVA micro controller.
Thanks
Jon
Have you enabled IP fragmentation? (IP_FRAG)
Or you could just break up the data yourself, add a little custom
header, and essentially fragment the data yourself. Depending on what's
in this data, you could add sequence numbers and a way for the peer to
report they missed a chunk? How often are you sending these blocks of data?
Patrick
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