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I develop a FTP server with lwIP 1.3.2 in Cortex M3 platform, when I use FlashFXP to get file from the server, the tcp_sndbuf always return 0 after work a while .
I capture it with wireshark, the file is attached file. The server ip: 192.168.1.51. it seems that transfer error and need retransmission.
My sendcode in server is below:
static void send_data(struct tcp_pcb *pcb, struct ftpd_datastate *fsd)
{
err_t err;
u16_t len;
int i;
if (sfifo_used(&fsd->fifo) > 0)
{
if (tcp_sndbuf(pcb) < sfifo_used(&fsd->fifo))
{
len = tcp_sndbuf(pcb); -> the len is set 0 after work a while.
}
else
{
len = (u16_t)sfifo_used(&fsd->fifo);
}
i = fsd->fifo.readpos;
if ((i + len) > fsd->fifo.size)
{
err = tcp_write(pcb, fsd->fifo.buffer + i, (u16_t)(fsd->fifo.size - i), 1);
if (err != ERR_OK)
{
return;
}
len -= fsd->fifo.size - i;
fsd->fifo.readpos = 0;
i = 0;
}
err = tcp_write(pcb, fsd->fifo.buffer + i, len, 1);
if (err != ERR_OK)
{
return;
}
fsd->fifo.readpos += len;
}
}
Who know how to solve ?
Vincent Cui
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