Re: [lwip-users] netconn_recv blocked

[Jonathan Larmour]

Chien-Lung Wu wrote:
>   8. My questions: 
>      Q1. I am sure DHCP server sent out DHCPOFFER packets
> (broadcasting); 
>
>          HOW can client to receive such broadcast packet?
>          Should I rebind the socket/connect again 
> 		(Netconn_bind(conn, IP_ADDR_ANY, DHCP_CLIENT_PORT);)

No.

I suspect since you aren't using the lwIP DHCP client, that you therefor 
do not have LWIP_DHCP enabled. That means a magic bit of code in 
core/ipv4/ip.c does not get triggered. I suggest you look at that file 
(search for LWIP_DHCP in that file) as you'll need that code.

>      Q2. The netconn_recv(conn) seems been blocked!
>          Are there any ways to have timeout mechanism to unblock the
> process 
>          After certain time?

If you are using CVS, you can enable LWIP_SO_RCVTIMEO. There isn't an 
official API function to then set the timeout, but you do it by assigning 
to the 'recv_timeout' member of the 'struct netconn'.

Jifl
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