[lwip-users] LWIP_1.4.1 DHCP not working.

[antonio]

Dear All,

I have a basic scenario where my MBEDTLS application uses LWIP sockets. 
So far I have used static IP address with my mbedtls application and it
worked well, and today, I wanted to use DCHP to replace the static
configuration with dynamic address config and I do not get any address
because the DHCP process keeps sending DHCP Discover. Bellow I have a DHCP
Debug Log and also Wireshark. 

Thanks in advance. 

Here is where I call the DHCP process.. 
static void tcpip_init_done(void* arg){
    ip4_addr_t zero = {0};
    netif_set_default(netif_add(&netif_tap, &zero, &zero, &zero, NULL,
tapif_init, tcpip_input));

    netif_set_up(&netif_tap);
    mbedtls_printf("===>LWIP_HTTPS::Interface [%c%c] set.\n",
netif_tap.name[0], netif_tap.name[1]);

    if(dhcp_start(&netif_tap) == ERR_OK){
        mbedtls_printf("===>LWIP_HTTPS::dhcp start OK\n");
    }
    //ready to go
    //os_sem_post(sem);
}

Further inspection, the Debug messages show 
===>LWIP_HTTPS::Interface [tp] set.
dhcp_start(netif=0x000401c8) tp1
dhcp_start(): starting new DHCP client
dhcp_start(): allocated dhcpdhcp_start(): starting DHCP configuration
dhcp_discover()
transaction id xid(0)
dhcp_discover: making request
dhcp_discover: realloc()ing
dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)
dhcp_discover: deleting()ing
dhcp_discover: SELECTING
dhcp_discover(): set request timeout 2000 msecs
===>LWIP_HTTPS::dhcp start OK
dhcp_arp_reply()
dhcp_fine_tmr(): request timeout
dhcp_timeout()
dhcp_timeout(): restarting discovery
dhcp_discover()
transaction id xid(0)
dhcp_discover: making request
dhcp_discover: realloc()ing
dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)
...........

and I also confirmed it using Wireshark. 

     8 7.964857416    0.0.0.0               255.255.255.255       DHCP    
350    DHCP Discover - Transaction ID 0x0

Frame 8: 350 bytes on wire (2800 bits), 350 bytes captured (2800 bits) on
interface 0
Ethernet II, Src: Woonsang_04:05:06 (00:02:03:04:05:06), Dst: Broadcast
(ff:ff:ff:ff:ff:ff)
Internet Protocol Version 4, Src: 0.0.0.0, Dst: 255.255.255.255
User Datagram Protocol, Src Port: 68, Dst Port: 67
Bootstrap Protocol (Discover)
    Message type: Boot Request (1)
    Hardware type: Ethernet (0x01)
    Hardware address length: 6
    Hops: 0
    Transaction ID: 0x00000000
    Seconds elapsed: 0
    Bootp flags: 0x0000 (Unicast)
    Client IP address: 0.0.0.0
    Your (client) IP address: 0.0.0.0
    Next server IP address: 0.0.0.0
    Relay agent IP address: 0.0.0.0
    Client MAC address: Woonsang_04:05:06 (00:02:03:04:05:06)
    Client hardware address padding: 00000000000000000000
    Server host name not given
    Boot file name not given
    Magic cookie: DHCP
    Option: (53) DHCP Message Type (Discover)
    Option: (57) Maximum DHCP Message Size
    Option: (55) Parameter Request List
    Option: (255) End
    Padding: 000000000000000000000000000000000000000000000000...




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