I'm using lwIP, raw mode, in a project which plays Internet streaming audio.
When my audio ring buffer becomes full, I must momentarily halt incoming
packets. Previously I was using uIP, and I could simply call uip_stop and
uip_restart. That worked great but uIP had other problems with the data stream
which I'm hoping lwIP can solve.
As I understand, in the recieve callback I would call tcp_recved() and
pbuf_free() to tell lwIP that I have the data and it can clear it from its
buffer. How do I tell lwIP that I can't accept more data now, and it should
send ZeroWindows? I have tried not calling these functions in different
combinations, and the host (what lwIP is connecting to) keeps retransmitting
because lwIP apparently didn't ACK.
However, I noticed if I set tcp_recv(pcb, 0) rather than the correct callback
function, it will send ZeroWindows.
Do I have to keep track of the pointer to the pbuf in my code to use later (if
my buffer is full), and when should I call tcp_recved() when I can't currently
accept more data? What is the correct usage to ensure lwIP sends ZeroWindows
rather than not ACKing?
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