This is how I did it in lwip 0.6.4. It might be different in the latest version.
In lwipopts.h you must set your DHCP options: #define LWIP_DHCP 1 /* Enable DHCP */ #define DHCP_DOES_ARP_CHECK 0 /* Set this to 1 if you want dhcp to do an arp check on the offered address */ #define DHCP_OPTIONS_LEN 68 /* Space allocated for options in DHCP messages */ In your initialization routine you must call the usual lwIP init functions: sys_init(); mem_init(); memp_init(); pbuf_init(); netif_init(); ip_init(); If you are using udp and tcp then call udp_init(); tcp_init(); Add your network interfaces... Set ip.addr = 0, gw.addr = 0 and netmask.addr = 0 before you call netif = netif_add(&ip, &netmask, &gw, ...) To start the dhcp client on a network interface call dhcp_start(netif); and then set the NETIF_FLAG_DHCP flag in your netif. netif->flags &= NETIF_FLAG_DHCP; and then call dhcp_fine_tmr(); every 500ms dhcp_coarse_tmr(); every 60 sec To stop the dhcp client call dhcp_stop(netif); and unset the NETIF_FLAG_DHCP flag in your netif. netif->flags |= NETIF_FLAG_DHCP; stop calling dhcp_fine_tmr() and dhcp_coarse_tmr(). I think that's it. Good luck. Cheers, Rob Brown -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Robson Sent: November 1, 2005 7:48 AM To: [email protected] Subject: [lwip-users] HELP, PLease! DCHP Client Hi, I´m using LWIP with an ARM Microcontroler in a specific application, and I want to use this in my common network. So, I want to establish a DHCP client. But I don´t know how to set DCHP and how to call the correct functions. My question is: in a simple application, what is the configurations and the exactly sequence of call functions should we use? I try to use dchp_start(), dchp_discover()…but no results. Please, help more urgent than possible! If anyone knows how to do this, please, help me! Write for my email [EMAIL PROTECTED] or to this email list. Thanks Robson Paulo _______________________________________________ lwip-users mailing list [email protected] http://lists.nongnu.org/mailman/listinfo/lwip-users
