[lwip-users] Cannot create netconn

[Emil Ohlsson]

Hi!

I'm having trouble creating a netconn connection. When I run the code below

        struct netconn *srv, *cli;

        cli = netconn_new(NETCONN_UDP);
        if ( cli == NULL ) {
                // This is where I end up.
        }
Netconn_new returns NULL, and I have concluded that this is because 
netconn_alloc returns NULL. My guess is that I have done some bad memory 
configuration, but I have no idea how. I have attached my lwipopts.h at the end 
of this mail. I'm running lwIP 1.3.2 on a TI Stellaris Cortex M3 (LM3S9B96). 

Does anybody what the error could be or any clues on how I can debug this error.

Best regards
Emil Ohlsson

//*****************************************************************************
//
// ---------- Platform specific locking ----------
//
//*****************************************************************************
#define SYS_LIGHTWEIGHT_PROT            1           // default is 0
#define NO_SYS                          0           // default is 0
//#define MEMCPY(dst,src,len)             memcpy(dst,src,len)
//#define SMEMCPY(dst,src,len)            memcpy(dst,src,len)

//*****************************************************************************
//
// ---------- Memory options ----------
//
//*****************************************************************************
#define MEM_LIBC_MALLOC                 0
#define MEM_ALIGNMENT                   4           // default is 1
#define MEM_SIZE                        (16 * 1024)  // default is 1600, was 16K
#define MEMP_OVERFLOW_CHECK             0
#define MEMP_SANITY_CHECK               0
#define MEM_USE_POOLS                   0
#define MEMP_USE_CUSTOM_POOLS           0

//*****************************************************************************
//
// ---------- Internal Memory Pool Sizes ----------
//
//*****************************************************************************
//#define MEMP_NUM_PBUF                   64    // Default 16, was 16
//#define MEMP_NUM_RAW_PCB                4
//#define MEMP_NUM_UDP_PCB                4
//#define MEMP_NUM_TCP_PCB                40          // default is 5
//#define MEMP_NUM_TCP_PCB_LISTEN         8
//#define MEMP_NUM_TCP_SEG                48          // default is 16
//#define MEMP_NUM_REASSDATA              5
//#define MEMP_NUM_ARP_QUEUE              30
//#define MEMP_NUM_IGMP_GROUP             8
#define MEMP_NUM_SYS_TIMEOUT              10
//#define MEMP_NUM_NETBUF                 2
//#define MEMP_NUM_NETCONN                4
//#define MEMP_NUM_TCPIP_MSG_API          8
//#define MEMP_NUM_TCPIP_MSG_INPKT        8
//#define PBUF_POOL_SIZE                  64    // Default 16, was 36

//*****************************************************************************
//
// ---------- ARP options ----------
//
//*****************************************************************************
//#define LWIP_ARP                        1
//#define ARP_TABLE_SIZE                  10
//#define ARP_QUEUEING                    1
//#define ETHARP_TRUST_IP_MAC             1

//*****************************************************************************
//
// ---------- IP options ----------
//
//*****************************************************************************
//#define IP_FORWARD                      0
//#define IP_OPTIONS_ALLOWED              1
//#define IP_REASSEMBLY                   0           // default is 1
//#define IP_FRAG                         0           // default is 1
//#define IP_REASS_MAXAGE                 3
//#define IP_REASS_MAX_PBUFS              10
//#define IP_FRAG_USES_STATIC_BUF         1
//#define IP_FRAG_MAX_MTU                 1500
//#define IP_DEFAULT_TTL                  255

//*****************************************************************************
//
// ---------- ICMP options ----------
//
//*****************************************************************************
//#define LWIP_ICMP                       1
//#define ICMP_TTL                       (IP_DEFAULT_TTL)

//*****************************************************************************
//
// ---------- RAW options ----------
//
//*****************************************************************************
//#define LWIP_RAW                        1
//#define RAW_TTL                        (IP_DEFAULT_TTL)

//*****************************************************************************
//
// ---------- DHCP options ----------
//
//*****************************************************************************
#define LWIP_DHCP                       1           // default is 0
//#define DHCP_DOES_ARP_CHECK             ((LWIP_DHCP) && (LWIP_ARP))

//*****************************************************************************
//
// ---------- UPNP options ----------
//
//*****************************************************************************
//#define LWIP_UPNP                       0

//*****************************************************************************
//
// ---------- PTPD options ----------
//
//*****************************************************************************
//#define LWIP_PTPD                       0

//*****************************************************************************
//
// ---------- AUTOIP options ----------
//
//*****************************************************************************
#define LWIP_AUTOIP                     1           // default is 0
#define LWIP_DHCP_AUTOIP_COOP           ((LWIP_DHCP) && (LWIP_AUTOIP))
                                                    // default is 0
#define LWIP_DHCP_AUTOIP_COOP_TRIES     5           // default is 9

//*****************************************************************************
//
// ---------- SNMP options ----------
//
//*****************************************************************************
//#define LWIP_SNMP                       0
//#define SNMP_CONCURRENT_REQUESTS        1
//#define SNMP_TRAP_DESTINATIONS          1
//#define SNMP_PRIVATE_MIB                0
//#define SNMP_SAFE_REQUESTS              1

//*****************************************************************************
//
// ---------- IGMP options ----------
//
//*****************************************************************************
//#define LWIP_IGMP                       0

//*****************************************************************************
//
// ---------- DNS options -----------
//
//*****************************************************************************
//#define LWIP_DNS                        0
//#define DNS_TABLE_SIZE                  4
//#define DNS_MAX_NAME_LENGTH             256
//#define DNS_MAX_SERVERS                 2
//#define DNS_DOES_NAME_CHECK             1
//#define DNS_USES_STATIC_BUF             1
//#define DNS_MSG_SIZE                    512

//*****************************************************************************
//
// ---------- UDP options ----------
//
//*****************************************************************************
//#define LWIP_UDP                        1
//#define LWIP_UDPLITE                    0
//#define UDP_TTL                         (IP_DEFAULT_TTL)

//*****************************************************************************
//
// ---------- TCP options ----------
//
//*****************************************************************************
//#define LWIP_TCP                        1
//#define TCP_TTL                         (IP_DEFAULT_TTL)
#define TCP_WND                         4096   // default is 2048
//#define TCP_MAXRTX                      12
//#define TCP_SYNMAXRTX                   6
//#define TCP_QUEUE_OOSEQ                 1
#define TCP_MSS                        1500        // default is 128
//#define TCP_CALCULATE_EFF_SEND_MSS      1
#define TCP_SND_BUF                     (6 * TCP_MSS)
                                                    // default is 256
#define TCP_SND_QUEUELEN                (MEMP_NUM_TCP_SEG)
                                                    // default is (4 * 
(TCP_SND_BUF/TCP_MSS))
//#define TCP_SNDLOWAT                    (TCP_SND_BUF/2)
//#define TCP_LISTEN_BACKLOG              0
//#define TCP_DEFAULT_LISTEN_BACKLOG      0xff

//*****************************************************************************
//
// ---------- API options ----------
//
//*****************************************************************************
//#define LWIP_EVENT_API                  0
//#define LWIP_CALLBACK_API               1

//*****************************************************************************
//
// ---------- Pbuf options ----------
//
//*****************************************************************************
#define PBUF_LINK_HLEN                  16          // default is 14
#define PBUF_POOL_BUFSIZE               256
                                                    // default is 
LWIP_MEM_ALIGN_SIZE(TCP_MSS+40+PBUF_LINK_HLEN)
#define ETH_PAD_SIZE                    2           // default is 0

//*****************************************************************************
//
// ---------- Network Interfaces options ----------
//
//*****************************************************************************
//#define LWIP_NETIF_HOSTNAME             0
//#define LWIP_NETIF_API                  0
//#define LWIP_NETIF_STATUS_CALLBACK      0
//#define LWIP_NETIF_LINK_CALLBACK        0
//#define LWIP_NETIF_HWADDRHINT           0

//*****************************************************************************
//
// ---------- LOOPIF options ----------
//
//*****************************************************************************
//#define LWIP_HAVE_LOOPIF                0
//#define LWIP_LOOPIF_MULTITHREADING      1

//*****************************************************************************
//
// ---------- Thread options ----------
//
//*****************************************************************************
#define TCPIP_THREAD_NAME              "tcpip_thread"
#define TCPIP_THREAD_STACKSIZE          1024
#define TCPIP_THREAD_PRIO               3
#define TCPIP_MBOX_SIZE                 32
//#define SLIPIF_THREAD_NAME             "slipif_loop"
//#define SLIPIF_THREAD_STACKSIZE         0
//#define SLIPIF_THREAD_PRIO              1
//#define PPP_THREAD_NAME                "pppMain"
//#define PPP_THREAD_STACKSIZE            0
//#define PPP_THREAD_PRIO                 1
//#define DEFAULT_THREAD_NAME            "lwIP"
//#define DEFAULT_THREAD_STACKSIZE        0
//#define DEFAULT_THREAD_PRIO             1
//#define DEFAULT_RAW_RECVMBOX_SIZE       0
//#define DEFAULT_UDP_RECVMBOX_SIZE       0
//#define DEFAULT_TCP_RECVMBOX_SIZE       0
//#define DEFAULT_ACCEPTMBOX_SIZE         0

//*****************************************************************************
//
// ---------- Sequential layer options ----------
//
//*****************************************************************************
//#define LWIP_TCPIP_CORE_LOCKING         0
//#define LWIP_NETCONN                    1           // default is 1

//*****************************************************************************
//
// ---------- Socket Options ----------
//
//*****************************************************************************
#define LWIP_SOCKET                       0           // default is 1
//#define LWIP_COMPAT_SOCKETS             1
//#define LWIP_POSIX_SOCKETS_IO_NAMES     1
//#define LWIP_TCP_KEEPALIVE              0
//#define LWIP_SO_RCVTIMEO                0
//#define LWIP_SO_RCVBUF                  0
//#define SO_REUSE                        0

//*****************************************************************************
//
// ---------- Statistics options ----------
//
//*****************************************************************************
#define LWIP_STATS                      0
#define LWIP_STATS_DISPLAY              0
#define LINK_STATS                      0
#define ETHARP_STATS                    0
#define IP_STATS                        0
#define IPFRAG_STATS                    0
#define ICMP_STATS                      0
#define IGMP_STATS                      0
#define UDP_STATS                       0
#define TCP_STATS                       0
#define MEM_STATS                       0
#define MEMP_STATS                      0
#define SYS_STATS                       0
#define LWIP_STATS_LARGE                0