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Application using lwIP stops working after 4-5 days on a TM4C1294XL LaunchPad

Peter Haagerup
Prodigy 140 points

Hi

I am working on an embedded application in which I am sending small TCP packets to a web server every 5
minutes. This is running fine for 4-5 days, but then it suddenly stops working. The application is running on
a Tiva C Series TM4C1294XL LaunchPad with lwIP-1.4.1 as supplied by Texas Instruments in the TivaWare 
Library. My application is based on the "enet_lwip" example.

The Tiva-board is connected to an Ethernet router along with another computer that saves UART output from the
microcontroller (including lwIP stats) and logs Ethernet traffic with Wireshark.

Here is what I found in the log files:

Wireshark: The application appear to stop after HTTP POST, without getting HTTP/OK from the server as it
usually does. After about 30 seconds thereafter, the application sends a HTTP FIN/ACK. After this, the router
is unable to receive information from the Tiva-board doing ARPs towards its IP address.

lwIP: In the status log I have found that the fields "max" and "err" in the "MEM UDP_PCB" section both starts
out with small values like 0, 1 or 2. Around the same time as the Wireshark log indicates problems, these
fields are now both 4294967295, which is equal to 2^32-1.

So, I suspect that some kind of overflow/underflow is going on in the memory allocated by lwIP running on the
microcontroller. I do not know what "MEM UDP_PCB" is, but it must be memory related and have something to do
with UDP, I suppose.... lwIP does not seem to be well documented so I am stuck.

I really appreciate any help or advice that could lead me to a solution.

Thanks in advance :-)

  • 0
    TI__Mastermind 22580 points
    Hello Peter,

    Are you using UDP sockets in you application? Look at your "lwipopts.h" file in the project file for configuration details. From the error description, it looks like UDP buffers are created but some or all of the buffers are not returned to the buffer pool. When the buffer pool becomes empty, the lwip stops processing packets.

    You state that your embedded application is a HTTP client. Did you write your own HTTP Client layer or are you using the one in TivaWare? Also which version of TivaWare are you using?

    Thanks,
    Sai
  • 0 in reply to Sai Reddy
    Prodigy 140 points

    Thank you for your response, Sai.

    As far as I know, I am not using UDP sockets. The HTTP packets are constructed manually and sent using the TCP functions in lwIP. I noticed something in the setup file "lwipots.h". Can you take a look at the memory settings below? I would like to know if something is wrong. Some overflow/sanity checks are disabled - maybe it would make a difference if enabled? Strangely the "MEM_USE_POOLS" is also disabled? Maybe this should be enabled?

    The TivaWare version is 2.1.2.111.

    //*****************************************************************************
//
// ---------- Memory options ----------
//
//*****************************************************************************
//#define MEM_LIBC_MALLOC                 0
#define MEM_ALIGNMENT                     4
#define MEM_SIZE                          (64 * 1024)
//#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                     48    // Default 16
//#define MEMP_NUM_RAW_PCB                4
//#define MEMP_NUM_UDP_PCB                4
#define MEMP_NUM_TCP_PCB                  16    // Default 5
//#define MEMP_NUM_TCP_PCB_LISTEN         8
//#define MEMP_NUM_TCP_SEG                16
//#define MEMP_NUM_REASSDATA              5
//#define MEMP_NUM_ARP_QUEUE              30
//#define MEMP_NUM_IGMP_GROUP             8
#define MEMP_NUM_SYS_TIMEOUT              8
//#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                    48    // Default 16

    And the "Pbuf options" is probably also memory related:

    //*****************************************************************************
//
// ---------- Pbuf options ----------
//
//*****************************************************************************
#define PBUF_LINK_HLEN                  16          // default is 14
#define PBUF_POOL_BUFSIZE               512
                              // PBUF_POOL_BUFSIZE default is
                              // LWIP_MEM_ALIGN_SIZE(TCP_MSS+40+PBUF_LINK_HLEN)
#define ETH_PAD_SIZE                    0           // default is 0


    Thanks in advance :-)

  • 0 in reply to Peter Haagerup
    TI__Mastermind 22580 points

    Hello Peter,

    The option you posted look good. Do you have the following line in the lwipopts.h file? It enables the UDP protocol, which could explain the UDP buffers being used and not freed.

    #define LWIP_UDP                        1

    Thanks,

    Sai

  • 0 in reply to Sai Reddy
    Prodigy 140 points

    Thanks again for your quick response :-)

    No, this line is commented out.  I did a search for everything UDP-related in the lwipopts.h file and found that only STATS is turned on (which is needed to display the UDP-related fields in the status output to the UART).

    //#define MEMP_NUM_UDP_PCB                4
// ---------- UDP options ----------
//#define LWIP_UDP                        1
//#define LWIP_UDPLITE                    0
//#define UDP_TTL                         (IP_DEFAULT_TTL)
//#define DEFAULT_UDP_RECVMBOX_SIZE       0
#define UDP_STATS                       (LWIP_UDP)
#define UDP_STATS                       (LWIP_UDP)
#define CHECKSUM_GEN_UDP                0
#define CHECKSUM_CHECK_UDP              0
//#define UDP_DEBUG                       LWIP_DBG_ON     // default is OFF

  • 0 in reply to Peter Haagerup
    Intellectual 300 points

    UDP defaults to on. See lwip/src/include/lwip/opt.h:

    #ifndef LWIP_UDP
#define LWIP_UDP                        1
#endif

    In general, the commented out options in the TI lwIP example are the default values. It can be confusing and there's probably some exceptions.

  • 0 in reply to BB_
    Prodigy 140 points

    Thank you for pointing that out, BB_. I will set LWIP_UDP to zero and run some tests again :-)

  • 0 in reply to Peter Haagerup
    Prodigy 140 points

    OK... I tried to set LWIP_UDP to zero. It won't compile. Turns out that the DHCP client is using UDP and since I am using DHCP for this project, UDP has to be turned on.

    So, where do I go from here? Below I have posted the complete version of my lwipopts.h. Please tell me if you find anything suspicious. The problem could be DHCP or memory related as well. Still very strange that it runs very well for several days before the problem occurs.

    I very much appreciate all the suggestions so far, but I am afraid the problem is still not solved :-(

    //*****************************************************************************
//
// lwipopts.h - Configuration file for lwIP
//
// Copyright (c) 2013-2015 Texas Instruments Incorporated.  All rights reserved.
// Software License Agreement
// 
// Texas Instruments (TI) is supplying this software for use solely and
// exclusively on TI's microcontroller products. The software is owned by
// TI and/or its suppliers, and is protected under applicable copyright
// laws. You may not combine this software with "viral" open-source
// software in order to form a larger program.
// 
// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
// DAMAGES, FOR ANY REASON WHATSOEVER.
// 
// This is part of revision 2.1.2.111 of the EK-TM4C1294XL Firmware Package.
//
//*****************************************************************************
//
// NOTE:  This file has been derived from the lwIP/src/include/lwip/opt.h
// header file.
//
// For additional details, refer to the original "opt.h" file, and lwIP
// documentation.
//
//*****************************************************************************

#ifndef __LWIPOPTS_H__
#define __LWIPOPTS_H__

//*****************************************************************************
//
// ---------- Stellaris / lwIP Port Options ----------
//
//*****************************************************************************
#define HOST_TMR_INTERVAL               100         // default is 0
// #define DHCP_EXPIRE_TIMER_MSECS         (60 * 1000)
//#define LWIP_HTTPD_SSI                  1
//#define LWIP_HTTPD_CGI                  1
#define LWIP_HTTPD_DYNAMIC_HEADERS      1
//#define HTTPD_DEBUG                     LWIP_DBG_ON
#define EMAC_PHY_CONFIG (EMAC_PHY_TYPE_INTERNAL | EMAC_PHY_INT_MDIX_EN |      \
                         EMAC_PHY_AN_100B_T_FULL_DUPLEX)
#define PHY_PHYS_ADDR      0
#define NUM_TX_DESCRIPTORS 24
#define NUM_RX_DESCRIPTORS 8

//*****************************************************************************
//
// ---------- Platform specific locking ----------
//
//*****************************************************************************
#define SYS_LIGHTWEIGHT_PROT            1           // default is 0
#define NO_SYS                          1           // 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
#define MEM_SIZE                          (64 * 1024)
//#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                     48    // Default 16
//#define MEMP_NUM_RAW_PCB                4
//#define MEMP_NUM_UDP_PCB                4
#define MEMP_NUM_TCP_PCB                  16    // Default 5
//#define MEMP_NUM_TCP_PCB_LISTEN         8
//#define MEMP_NUM_TCP_SEG                16
//#define MEMP_NUM_REASSDATA              5
//#define MEMP_NUM_ARP_QUEUE              30
//#define MEMP_NUM_IGMP_GROUP             8
#define MEMP_NUM_SYS_TIMEOUT              8
//#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                    48    // Default 16

//*****************************************************************************
//
// ---------- 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                         8192//4096   // default is 2048
//#define TCP_MAXRTX                      12
//#define TCP_SYNMAXRTX                   1//6 										Trial
//#define TCP_QUEUE_OOSEQ                 1
#define TCP_MSS                        1500        // default is 128
//#define TCP_CALCULATE_EFF_SEND_MSS      1
#define TCP_SND_BUF                     (4 * TCP_MSS)
                                                    // default is 256, was 6 *
//#define TCP_SND_QUEUELEN                (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               512
                              // PBUF_POOL_BUFSIZE default is
                              // LWIP_MEM_ALIGN_SIZE(TCP_MSS+40+PBUF_LINK_HLEN)
#define ETH_PAD_SIZE                    0           // 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          0
//#define TCPIP_THREAD_PRIO               1
//#define TCPIP_MBOX_SIZE                 0
//#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                    0           // 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                      1
#define LWIP_STATS_DISPLAY              1//0
#define LINK_STATS                      1
#define ETHARP_STATS                    (LWIP_ARP)
#define IP_STATS                        1
#define IPFRAG_STATS                    (IP_REASSEMBLY || IP_FRAG)
#define ICMP_STATS                      1
#define IGMP_STATS                      (LWIP_IGMP)
#define UDP_STATS                       (LWIP_UDP)
#define TCP_STATS                       (LWIP_TCP)
#define MEM_STATS                       1
#define MEMP_STATS                      1
#define SYS_STATS                       1

//*****************************************************************************
//
// ---------- PPP options ----------
//
//*****************************************************************************
//#define PPP_SUPPORT                     0
//#define PPPOE_SUPPORT                   0
//#define PPPOS_SUPPORT                   PPP_SUPPORT

#if PPP_SUPPORT
//#define NUM_PPP                         1
//#define PAP_SUPPORT                     0
//#define CHAP_SUPPORT                    0
//#define MSCHAP_SUPPORT                  0
//#define CBCP_SUPPORT                    0
//#define CCP_SUPPORT                     0
//#define VJ_SUPPORT                      0
//#define MD5_SUPPORT                     0
//#define FSM_DEFTIMEOUT                  6
//#define FSM_DEFMAXTERMREQS              2
//#define FSM_DEFMAXCONFREQS              10
//#define FSM_DEFMAXNAKLOOPS              5
//#define UPAP_DEFTIMEOUT                 6
//#define UPAP_DEFREQTIME                 30
//#define CHAP_DEFTIMEOUT                 6
//#define CHAP_DEFTRANSMITS               10
//#define LCP_ECHOINTERVAL                0
//#define LCP_MAXECHOFAILS                3
//#define PPP_MAXIDLEFLAG                 100

//#define PPP_MAXMTU                      1500
//#define PPP_DEFMRU                      296
#endif

//*****************************************************************************
//
// ---------- checksum options ----------
//
//*****************************************************************************
#define CHECKSUM_GEN_IP                 0
#define CHECKSUM_GEN_ICMP               0
#define CHECKSUM_GEN_UDP                0
#define CHECKSUM_GEN_TCP                0
#define CHECKSUM_CHECK_IP               0
#define CHECKSUM_CHECK_UDP              0
#define CHECKSUM_CHECK_TCP              0

//*****************************************************************************
//
// ---------- Debugging options ----------
//
//*****************************************************************************
#if 1
#define U8_F "c"
#define S8_F "c"
#define X8_F "x"
#define U16_F "u"
#define S16_F "d"
#define X16_F "x"
#define U32_F "u"
#define S32_F "d"
#define X32_F "x"
extern void UARTprintf(const char *pcString, ...);
#define LWIP_DEBUG
#endif


#define LWIP_PLATFORM_DIAG(x) {UARTprintf x ;}					// trial of getting stats to work



//#define LWIP_DBG_MIN_LEVEL              LWIP_DBG_LEVEL_OFF
#define LWIP_DBG_MIN_LEVEL              LWIP_DBG_LEVEL_OFF
//#define LWIP_DBG_MIN_LEVEL              LWIP_DBG_LEVEL_WARNING
//#define LWIP_DBG_MIN_LEVEL              LWIP_DBG_LEVEL_SERIOUS
//#define LWIP_DBG_MIN_LEVEL              LWIP_DBG_LEVEL_SEVERE

//#define LWIP_DBG_TYPES_ON               LWIP_DBG_ON
#define LWIP_DBG_TYPES_ON               (LWIP_DBG_ON|LWIP_DBG_TRACE|          \
                                         LWIP_DBG_STATE|LWIP_DBG_FRESH)

//#define ETHARP_DEBUG                    LWIP_DBG_ON     // default is OFF
//#define NETIF_DEBUG                     LWIP_DBG_ON     // default is OFF
//#define PBUF_DEBUG                      LWIP_DBG_OFF
//#define API_LIB_DEBUG                   LWIP_DBG_OFF
//#define API_MSG_DEBUG                   LWIP_DBG_OFF
//#define SOCKETS_DEBUG                   LWIP_DBG_OFF
//#define ICMP_DEBUG                      LWIP_DBG_OFF
//#define IGMP_DEBUG                      LWIP_DBG_OFF
//#define INET_DEBUG                      LWIP_DBG_OFF
//#define IP_DEBUG                        LWIP_DBG_ON     // default is OFF
//#define IP_REASS_DEBUG                  LWIP_DBG_OFF
//#define RAW_DEBUG                       LWIP_DBG_OFF
//#define MEM_DEBUG                       LWIP_DBG_OFF
//#define MEMP_DEBUG                      LWIP_DBG_OFF
//#define SYS_DEBUG                       LWIP_DBG_OFF
//#define TCP_DEBUG                       LWIP_DBG_OFF
//#define TCP_INPUT_DEBUG                 LWIP_DBG_OFF
//#define TCP_FR_DEBUG                    LWIP_DBG_OFF
//#define TCP_RTO_DEBUG                   LWIP_DBG_OFF
//#define TCP_CWND_DEBUG                  LWIP_DBG_OFF
//#define TCP_WND_DEBUG                   LWIP_DBG_OFF
//#define TCP_OUTPUT_DEBUG                LWIP_DBG_OFF
//#define TCP_RST_DEBUG                   LWIP_DBG_OFF
//#define TCP_QLEN_DEBUG                  LWIP_DBG_OFF
//#define UDP_DEBUG                       LWIP_DBG_ON     // default is OFF
//#define TCPIP_DEBUG                     LWIP_DBG_OFF
//#define PPP_DEBUG                       LWIP_DBG_OFF
//#define SLIP_DEBUG                      LWIP_DBG_OFF
//#define DHCP_DEBUG                      LWIP_DBG_ON     // default is OFF
//#define AUTOIP_DEBUG                    LWIP_DBG_OFF
//#define SNMP_MSG_DEBUG                  LWIP_DBG_OFF
//#define SNMP_MIB_DEBUG                  LWIP_DBG_OFF
//#define DNS_DEBUG                       LWIP_DBG_OFF

#endif /* __LWIPOPTS_H__ */

  • 0 in reply to Peter Haagerup
    Intellectual 515 points

    Have you found a solution to your problem yet? If so, would you care to share it with us?

    Thank you