Starterware/CC3120: Porting MQTT Client to CC3120

Tim Simerly

Part Number: CC3120
Other Parts Discussed in Thread: SYSBIOS

Tool/software: Starterware

Dear Support:

I am trying to port the MQTT Client example running on the CC3220 over to the MSP432 + CC3120 and pulled the files over along with the mqtt_client.a library, but when getting to the linking stage, it fails with the following:

undefined first referenced
symbol in file
--------- ----------------
PRCMRTCGet C:/TI/simplelink_msp432_sdk_wifi_plugin_1_30_00_03/source/ti/net/mqtt/ccs/client/mqtt_client.a<cc32xx_platform.obj>
PRCMRTCInUseSet C:/TI/simplelink_msp432_sdk_wifi_plugin_1_30_00_03/source/ti/net/mqtt/ccs/client/mqtt_client.a<cc32xx_platform.obj>

error #10234-D: unresolved symbols remain
error #10010: errors encountered during linking; "mqtt_client_ibm_MSP_EXP432P401R_tirtos_ccs.out" not built

Can you tell me what I need to do to fix this problem of it not being able to find the above function calls? Please advise.

Thanks,
Tim

over 8 years ago

0 RogerMonk over 8 years ago

TI__Expert 3470 points

Hi Tim,

You could replace the implementation here using the posix timer/clock module which will make it portable across both these simplelink MCU platforms.

#include <ti/net/mqtt/platform/platform.h>

#include <time.h>

void platform_timer_init()
{
}

uint32_t platform_get_time_in_secs()
{
    struct timespec tspec;
    clock_gettime(CLOCK_MONOTONIC, &tspec);
    return (tspec.tv_sec);
}

[ FYI, include path to the posix headers will be needed for <time.h>, i.e. for TIRTOS - ${COM_TI_SIMPLELINK_MSP432_SDK_INSTALL_DIR}/kernel/tirtos/packages/ti/sysbios/posix ) ]

Hope that helps,

~roger

0 Tim Simerly over 8 years ago in reply to RogerMonk

TI__Genius 9975 points

Hey Roger:

Ok, thanks - that fixed the linker problem. Just one more question. There is also this routine:

void TimerPeriodicIntHandler(sigval val)
{
unsigned long ulInts;

/* Clear all pending interrupts from the timer we are currently using. */

ulInts = MAP_TimerIntStatus(TIMERA0_BASE, true);
MAP_TimerIntClear(TIMERA0_BASE, ulInts);

/* Increment our interrupt counter. */

     g_usTimerInts++;
     if (!(g_usTimerInts & 0x1))
     {

/* Turn Led Off */
          GPIO_write(Board_LED0, Board_LED_OFF);
     }
     else
     {

/* Turn Led On */
GPIO_write(Board_LED0, Board_LED_ON);
}
}

which uses TIMERA0_BASE of the CC3220. I could fix this by using an equivalent call for the MSP432, but that would make it not portable. Do you know of an equivalent way of doing this so that I can use the same code for both the CC3220 and the MSP432?

Thanks,
Tim

0 RogerMonk over 8 years ago in reply to Tim Simerly

TI__Expert 3470 points

Hi Tim,

Sorry I missed this follow-up yesterday.

Yes, you're right. I would suggest removing those lines and configure the it_value of the timer with something like :-

void TimerPeriodicIntHandler(sigval val)
{
//    unsigned long ulInts;

    /* Clear all pending interrupts from the timer we are currently using.    */
//    ulInts = MAP_TimerIntStatus(TIMERA0_BASE, true);
//    MAP_TimerIntClear(TIMERA0_BASE, ulInts);

    /* Increment our interrupt counter.                                       */
    g_usTimerInts++;
...
}

void LedTimerConfigNStart()
{
    struct itimerspec value;
...
    value.it_value.tv_nsec = 100 * 1000000;
...
}

Hope that helps,

~roger

0 Tim Simerly over 8 years ago in reply to RogerMonk

TI__Genius 9975 points

Thanks Roger - that worked. As usual, you are the man!

Thanks,
Tim

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Starterware/CC3120: Porting MQTT Client to CC3120