Hi Patrick
Yes I did try with fragmentation enabled but that didn't seem to work. I
can see in wireshark that there is a packet with IP4 type that mentions
fragmentation , but I don't get any UDP packets.
I also did a test where I just send two packets of 1400, one after
another, but only one get sent. I am wondering if I need to check some
send buffer like in TCP?
If I just allocate a pbuf of 2800 and then send it I dont actually get
any errors, it just doesnt send anything.
The problem is that I cant really do anything with the data in terms of
adding sequence numbers, as I am developing the code for the TIVA for a
pc application that is already defined. I kind of thought that UDP could
send up to 64k. I am a bit surprised I cant just ask LWIP to send a
large amount of data and then it send multiple packets.
Regards
Jon
On 19/07/2020 15:18, Patrick Klos wrote:
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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