Hello all,
I'm using lwip 2.1.2 in non-OS / non-threaded mode (main loop mode) with
raw API to send/receive TCP packets.
When sending packets with tcp_write() I'd like to use zero copy
mechanism. Therefore I need to keep the pbuf objects until the buffer
has been sent and acknowledged by the recipient. When acknowledged, my
callback registered by tcp_sent() is called:
static err_t
TCPSERVER_sentCallback(
void * arg,
struct tcp_pcb * tcpPcb,
uint16_t length) {
// remove pbuf which are reported as "sent"
...
}
Is "length" always matching a single pbuf length or could it happen that
TCPSERVER_sentCallback() reports multiple pbuf objects at once?
Also, can I assume, that TCPSERVER_sentCallback() is called in the order
the packets have been sent?
Thank you for reading,
Paul
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