RTOS: SImplelink HttpGet hostname resolution failed with static IP

After reading this link: file:///C:/ti/simplelink_msp432e4_sdk_3_10_00_11/docs/ndk/NDK_Users_Guide.html#using-a-statically-defined-dns-server

I have cheked the generated code (using syscfg) and everything seems fine, 

/*
 *  ======== ti_ndk_config_external_dns_init ========
 *  Specify an external DNS server
 */
void ti_ndk_config_external_dns_init(void *hCfg)
{
    uint32_t IPAddr = inet_addr("8.8.8.8");

    if (IPAddr) {
        CfgAddEntry(hCfg, CFGTAG_SYSINFO, CFGITEM_DHCP_DOMAINNAMESERVER,
            0, sizeof(IPAddr), (unsigned char *)&IPAddr, 0);
    }
}

    /* IP, TCP, and UDP config */
    configIp(hCfg);
    configTcp(hCfg);
    configUdp(hCfg);

    /* add the external DNS server to the configuration */
    ti_ndk_config_external_dns_init(hCfg);

    /* config low priority task stack size */
    u32cval = 2048;
    CfgAddEntry(hCfg, CFGTAG_OS, CFGITEM_OS_TASKSTKLOW, CFG_ADDMODE_UNIQUE,
            sizeof(uint32_t), (unsigned char *)&u32cval, NULL);

    /* config normal priority task stack size */
    u32cval = 2048;
    CfgAddEntry(hCfg, CFGTAG_OS, CFGITEM_OS_TASKSTKNORM, CFG_ADDMODE_UNIQUE,
            sizeof(uint32_t), (unsigned char *)&u32cval, NULL);

    /* config high priority task stack size */
    u32cval = 2048;
    CfgAddEntry(hCfg, CFGTAG_OS, CFGITEM_OS_TASKSTKHIGH, CFG_ADDMODE_UNIQUE,
            sizeof(uint32_t), (unsigned char *)&u32cval, NULL);

    /*  Boot the system using this configuration
     *
     *  Loop until the function returns 0. This facilitates a reboot command.
     */
    do
    {
        rc = NC_NetStart(hCfg, networkOpen, networkClose, networkIPAddr);

        /* user reboot hook == null */

    } while (rc > 0);

but my code still doesnt work.

I have check the httpget example with static ip configuration with a launchpad EK-TM4C129EXL with the suggestion below:

https://e2e.ti.com/support/microcontrollers/other/f/908/p/769043/2844877?tisearch=e2e-sitesearch&keymatch=ek-tm4c129exl

And the host name resolution was OK, consequently we can ignore the network issue in my home environment.

It is getting more strange.

I have disabled the SysCfg.externalDNS settings, and there is my function that is used instead:

void addExternalDNS(){

    uint32_t ip = inet_addr("8.8.8.8");

    int status = 0;

    if (ip) {
        status = CfgAddEntry(0, CFGTAG_SYSINFO, CFGITEM_DHCP_DOMAINNAMESERVER,
            0, sizeof(uint32_t), (unsigned char *)&ip, 0);
    }

    Display_printf(display, 0, 0, "myDnsSetup: %d", status);
}

The following hook is from the example:

httpget_MSP_EXP432E401Y_tirtos_ccs_syscfg

with only one modification. 

/*
 *  ======== netIPAddrHook ========
 *  user defined network IP address hook
 */
void netIPAddrHook(uint32_t IPAddr, unsigned int IfIdx, unsigned int fAdd)
{
    pthread_t          thread;
    pthread_attr_t     attrs;
    struct sched_param priParam;
    int                retc;
    int                detachState;
    uint32_t           hostByteAddr;
    static bool createTask = true;
    int32_t status = 0;

    if (fAdd) {
        Display_printf(display, 0, 0, "Network Added: ");
    }
    else {
        Display_printf(display, 0, 0, "Network Removed: ");
    }

    /* print the IP address that was added/removed */
    hostByteAddr = NDK_ntohl(IPAddr);
    Display_printf(display, 0, 0, "If-%d:%d.%d.%d.%d\n", IfIdx,
            (uint8_t)(hostByteAddr>>24)&0xFF, (uint8_t)(hostByteAddr>>16)&0xFF,
            (uint8_t)(hostByteAddr>>8)&0xFF, (uint8_t)hostByteAddr&0xFF);

    status = SlNetSock_init(0);
    if (status != 0) {
        Display_printf(display, 0, 0, "SlNetSock_init fail (%d)\n",
            status);
    }

    status = SlNetIf_init(0);
    if (status != 0) {
        Display_printf(display, 0, 0, "SlNetIf_init fail (%d)\n",
            status);
    }

    status = SlNetUtil_init(0);
    if (status != 0) {
        Display_printf(display, 0, 0, "SlNetUtil_init fail (%d)\n",
            status);
    }

    status = SlNetIf_add(SLNETIF_ID_2, EMACMSP432E4_ETHERNET_NAME,
            (const SlNetIf_Config_t *)&SlNetIfConfigNDK, IFPRI);
    if (status != 0) {
        Display_printf(display, 0, 0, "SlNetIf_add fail (%d)\n",
            status);
    }






    if (fAdd && createTask) {

        addExternalDNS();

        /*
         *  Create the Task that farms out incoming TCP connections.
         *  arg0 will be the port that this task listens to.
         */

        /* Set priority and stack size attributes */
        pthread_attr_init(&attrs);
        priParam.sched_priority = 1;

        detachState = PTHREAD_CREATE_DETACHED;
        retc = pthread_attr_setdetachstate(&attrs, detachState);
        if (retc != 0) {
            Display_printf(display, 0, 0,
                    "netIPAddrHook: pthread_attr_setdetachstate() failed\n");
            while (1);
        }

        pthread_attr_setschedparam(&attrs, &priParam);

        retc |= pthread_attr_setstacksize(&attrs, HTTPTASKSTACKSIZE);
        if (retc != 0) {
            Display_printf(display, 0, 0,
                    "netIPAddrHook: pthread_attr_setstacksize() failed\n");
            while (1);
        }

        retc = pthread_create(&thread, &attrs, httpTask, 0);
        if (retc != 0) {
            Display_printf(display, 0, 0,
                    "netIPAddrHook: pthread_create() failed\n");
            while (1);
        }

        createTask = false;
    }
}

You can see the fx: addExternalDNS();
So, when I set a breakpoint on addExternalDNS() that halts the execution and resume it, the http get works fine, the hostname resolution works. However if I remove the breakpoint the resolution fails...

Hello Daniel,

I will ask my colleague who has more knowledge on this topic to look into it.

Thanks,

Sai

Hello Daniel,

I have been able to reproduce your issue, and it is indeed a tricky one to debug. Right now I'm adding some instrumentation to the NDK to see if I can track down the cause of this. 

In the mean time I noticed you said that you checked the other post you linked to and then your "host name resolution was OK". Does that mean you get this to work in a previous version of the SDK or a non-syscfg version of the example?

Regards,

Dalton

Hello Dalton, 

The project where the hostname resolution working is EK-TM4C129EXL project and not related to SimpleLink or MSP432.

Thank you for your effort and the answer as well. I am going to mark your reply as solution but I can try it some days later.

I can confim that your solution is working flawlessly. 

Great! Thanks for confirming it.