TM4C129ENCPDT: Certificate date issue

I suspect it is in the interpretation of the epoch. From https://github.com/wolfSSL/wolfssl/issues/367 a comment from "cconlon"

"An ASN_AFTER_DATE_E error means that when wolfSSL was validating a certificate, the certificate's "Not Valid After" date was invalid. If you are on an embedded device, you should check to make sure your device clock is set correctly. By default wolfSSL uses time() to get seconds since the Unix epoch."

By default, the TI compiler does not use the POSIX epoch of Jan 1, 1970, rather Jan 1, 1900. That difference may make your MQTT certificate appear to expire. See: https://processors.wiki.ti.com/index.php/Time_and_clock_RTS_Functions

Hi,

  Can you reference the below code? Note that for this example, I adjusted the time to the US Central time zone where I work. You will adjust to your timezone. But a few hours of difference will not matter to the certificate date checking by Wolfssl. 

#include <string.h>
#include <time.h>

/* XDCtools Header files */
#include <xdc/runtime/Error.h>
#include <xdc/runtime/System.h>

/* TI-RTOS Header files */
#include <ti/sysbios/BIOS.h>
#include <ti/sysbios/hal/Seconds.h>
#include <ti/sysbios/knl/Task.h>
#include <ti/sysbios/knl/Semaphore.h>
#include <ti/drivers/GPIO.h>
#include <ti/net/http/httpcli.h>
#include <ti/net/sntp/sntp.h>

/* Example/Board Header file */
#include "Board.h"

#include <sys/socket.h>


#define NTP_HOSTNAME "north-america.pool.ntp.org"
#define NTP_PORT         "123"
#define NTP_SERVERS      3
#define NTP_SERVERS_SIZE (NTP_SERVERS * sizeof(struct sockaddr_in))
#define HTTPTASKSTACKSIZE 32768


unsigned char ntpServers[NTP_SERVERS_SIZE];
static Semaphore_Handle semHandle = NULL;

/*
 *  ======== printError ========
 */
void printError(char *errString, int code)
{
    System_printf("Error! code = %d, desc = %s\n", code, errString);
    BIOS_exit(code);
}

/*
 *  ======== timeUpdateHook ========
 *  Called after NTP time sync
 */
void timeUpdateHook(void *p)
{
    Semaphore_post(semHandle);
}

/*
 *  ======== startNTP ========
 */
void startNTP(void)
{
    int ret;
    int currPos;
    time_t ts;
    struct sockaddr_in ntpAddr;
    struct addrinfo hints;
    struct addrinfo *addrs;
    struct addrinfo *currAddr;
    Semaphore_Params semParams;

    memset(&hints, 0, sizeof(struct addrinfo));
    hints.ai_family = AF_INET;
    hints.ai_socktype = SOCK_DGRAM;


    ret = getaddrinfo(NTP_HOSTNAME, NTP_PORT, NULL, &addrs);
    if (ret != 0) {
        printError("startNTP: NTP host cannot be resolved!", ret);
    }

    currPos = 0;


    for (currAddr = addrs; currAddr != NULL; currAddr = currAddr->ai_next) {
        if (currPos < NTP_SERVERS_SIZE) {
            ntpAddr = *(struct sockaddr_in *)(currAddr->ai_addr);
            memcpy(ntpServers + currPos, &ntpAddr, sizeof(struct sockaddr_in));
            currPos += sizeof(struct sockaddr_in);
        }
        else {
            break;
        }
    }

    freeaddrinfo(addrs);

    ret = SNTP_start(Seconds_get, Seconds_set, timeUpdateHook,
            (struct sockaddr *)&ntpServers, NTP_SERVERS, 0);
    if (ret == 0) {
        printError("startNTP: SNTP cannot be started!", -1);
    }

    Semaphore_Params_init(&semParams);
    semParams.mode = Semaphore_Mode_BINARY;
    semHandle = Semaphore_create(0, &semParams, NULL);
    if (semHandle == NULL) {
        printError("startNTP: Cannot create semaphore!", -1);
    }

    SNTP_forceTimeSync();
    Semaphore_pend(semHandle, BIOS_WAIT_FOREVER);

    /* Adjust the time zone by 5 hours as the Seconds_get() is 5 hours ahead of Houston time */
    Seconds_set(Seconds_get()-5*60*60);
    ts = time(NULL);

    System_printf("Current time: %s\n", ctime(&ts));
    System_flush();

}

/*
 *  ======== netIPAddrHook ========
 *  This function is called when IP Addr is added/deleted
 */
void netIPAddrHook(unsigned int IPAddr, unsigned int IfIdx, unsigned int fAdd)
{
    static Task_Handle taskHandle;
    Task_Params taskParams;
    Error_Block eb;

    /* Create a HTTP task when the IP address is added */
    if (fAdd && !taskHandle) {
        Error_init(&eb);

        Task_Params_init(&taskParams);
        taskParams.stackSize = HTTPTASKSTACKSIZE;
        taskParams.priority = 1;
        taskHandle = Task_create((Task_FuncPtr)startNTP, &taskParams, &eb);
        if (taskHandle == NULL) {
            printError("netIPAddrHook: Failed to create HTTP Task\n", -1);
        }
    }
}

/*
 *  ======== main ========
 */
int main(void)
{
    /* Call board init functions */
    Board_initGeneral();
    Board_initGPIO();
    Board_initEMAC();

    /* Turn on user LED */
    GPIO_write(Board_LED0, Board_LED_ON);

    System_printf("Starting the SNTP example\nSystem provider is set to "
            "SysMin. Halt the target to view any SysMin contents in ROV.\n");
    /* SysMin will only print to the console when you call flush or exit */
    System_flush();

    /* Start BIOS */
    BIOS_start();

    return (0);
}