Data gets parted in 2 ways:
- the remote host may split the data in multiple network packets
- lwIP may split a received packet into multiple pbufs
There is however nothing unsorted. I.e. the pbufs you receive hold the
data in exactly the same order as the remote host sent it. If you don't
get the full data in the first call to your receive callback (be sure to
check all pbufs you have been passed: check the ->next pointers until
NULL), you can just hold on to these pbufs (don't free them yet) and
process them all together later when the receive callback is called again.
The number of packets is not known in advance (as the remote host
creates them as it likes); a counter that specifies the order is not
needed as they are always *in order*. Basically, you get one call to the
receive callback for every packet received. To get an overview over
these packets, a network sniffer like wireshark is always interesting.
Simon
Bernhard 'Gustl' Bauer wrote:
Hi,
I'm using HTTP server in contrib. Unfortunately it assume all data is
in one packet. In my situation data is spread over several packets. I
need to fit them together in the right order before processing. Any
pointers how to do this would be great. What I'm especially looking for
is the number of packets and a counter that specifies the order.
TIA
Gustl
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