Hi,
LwIP_select() seems do not work properly in my application. My
application has 2 UDP ports waiting for multicast packages. Before add
select(), I have confirmed that recvfrom() works fine. Here are piece of
my code:
While(1)
{
if(select())
{
recvfrom();
}
}
Select() always return 0; Step into lwIP code, sock->lastdata and sock->
rcvevent are always NULL in lwip_select().
However if comment out select() and call recvfrom() directly,
sock->lastdata and sock-> rcvevent are NULL too at the beginning in
lwip_recvfrom(). Then it calls sock->lastdata = buf =
netconn_recv(sock->conn) that trigger udp packages flow in through
udp_input().
Is this problem caused by mis-configurations in opt.h? What else may
cause this problem?
Thanks
Zhenwei
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