LAUNCHXL-CC2640R2: Attempting to change the data packets advertised during runtime using the skeleton code of Simple_broadcaster

Hi Joshua,

Joshua Gascoigne said:

Hi i have read a lot of stuff which all works within the simple_peripheral project. Will it also work for the non-connectable beacon transmission in Simple_broadcaster?

Yes, the link above will work in the Simple Broadcaster example. Here is some example code to explain how I accomplished this. The following code is from the BLE 5 Simple Broadcaster example for the CC2640 device.

Step 1) Change the event mask in SimpleBroadcaster_processGapMessage() function. The function is GapAdv_setEventMask(). Please look for the /**** SOLUTION ****/ comment in the code snippet.

static void SimpleBroadcaster_processGapMessage(gapEventHdr_t *pMsg)
{
  switch(pMsg->opcode)
  {
    case GAP_DEVICE_INIT_DONE_EVENT:
    {
      bStatus_t status = FAILURE;

      gapDeviceInitDoneEvent_t *pPkt = (gapDeviceInitDoneEvent_t *)pMsg;

      if(pPkt->hdr.status == SUCCESS)
      {
        // Store the system ID
        uint8_t systemId[DEVINFO_SYSTEM_ID_LEN];

        // use 6 bytes of device address for 8 bytes of system ID value
        systemId[0] = pPkt->devAddr[0];
        systemId[1] = pPkt->devAddr[1];
        systemId[2] = pPkt->devAddr[2];

        // set middle bytes to zero
        systemId[4] = 0x00;
        systemId[3] = 0x00;

        // shift three bytes up
        systemId[7] = pPkt->devAddr[5];
        systemId[6] = pPkt->devAddr[4];
        systemId[5] = pPkt->devAddr[3];

        // Set Device Info Service Parameter
        DevInfo_SetParameter(DEVINFO_SYSTEM_ID, DEVINFO_SYSTEM_ID_LEN, systemId);

        // Display device address
        Display_printf(dispHandle, 1, 0, "%s Addr: %s",
                       (addrMode <= ADDRMODE_RANDOM) ? "Dev" : "ID",
                       Util_convertBdAddr2Str(pPkt->devAddr));
        Display_printf(dispHandle, 2, 0, "Initialized");

        // Setup and start Advertising
        // For more information, see the GAP section in the User's Guide:
        // http://software-dl.ti.com/lprf/ble5stack-latest/

        // Temporary memory for advertising parameters. These will be copied
        // by the GapAdv module
        GapAdv_params_t advParamLegacy = GAPADV_PARAMS_LEGACY_SCANN_CONN_FIXED_CHAN;

        #ifndef BEACON_FEATURE
          advParamLegacy.eventProps = GAP_ADV_PROP_SCANNABLE | GAP_ADV_PROP_LEGACY;
        #else
          advParamLegacy.eventProps = GAP_ADV_PROP_LEGACY;
        #endif // !BEACON_FEATURE

        // Create Advertisement set
        status = GapAdv_create(&SimpleBroadcaster_advCallback, &advParamLegacy,
                               &advHandleLegacy);
        SIMPLEBROADCASTER_ASSERT(status == SUCCESS);

        // Load advertising data
        status = GapAdv_loadByHandle(advHandleLegacy, GAP_ADV_DATA_TYPE_ADV,
                                     sizeof(advertData), advertData);
        SIMPLEBROADCASTER_ASSERT(status == SUCCESS);

        // Load scan response data
        status = GapAdv_loadByHandle(advHandleLegacy, GAP_ADV_DATA_TYPE_SCAN_RSP,
                                     sizeof(scanRspData), scanRspData);
        SIMPLEBROADCASTER_ASSERT(status == SUCCESS);

        /*** SOLUTION ***/
        status = GapAdv_setEventMask(advHandleLegacy, GAP_ADV_EVT_MASK_ALL); // <- Changed to GAP_ADV_EVT_MASK_ALL
        SIMPLEBROADCASTER_ASSERT(status == SUCCESS);
        /*** END SOLUTION ***/
        
        // Enable legacy advertising
        status = GapAdv_enable(advHandleLegacy, GAP_ADV_ENABLE_OPTIONS_USE_MAX , 0);
        SIMPLEBROADCASTER_ASSERT(status == SUCCESS);
      }

      break;
    }

    default:
      Display_clearLine(dispHandle, 2);
      break;
  }
}

Step 2) Change the advertisement data in the GAP_EVT_ADV_END case. This will change the advertisement data after the previous one is sent.

static void SimpleBroadcaster_processAdvEvent(sbGapAdvEventData_t *pEventData)
{
  switch (pEventData->event)
  {
    case GAP_EVT_ADV_START_AFTER_ENABLE:
      Display_printf(dispHandle, 2, 0, "Advertising");
      break;
    case GAP_EVT_ADV_END_AFTER_DISABLE:
      Display_printf(dispHandle, 3, 0, "Disabled");
      break;
    case GAP_EVT_INSUFFICIENT_MEMORY:
      break;

    case GAP_EVT_ADV_START:
        Display_printf(dispHandle, 4, 0, "STARTING");
      break;

    case GAP_EVT_ADV_END:
      Display_printf(dispHandle, 5, 0,"STOPPING");
      GapAdv_prepareLoadByHandle(advHandleLegacy, GAP_ADV_FREE_OPTION_DONT_FREE);

      // Sample buffer modification, advCount is a changing variable.
      if (advCount == 5) advCount = 0;
      else advCount += 1;

      advertData[5] = advCount;
      advertData[6] = advCount + 1;
      advertData[7] = advCount + 2;
      // Reload buffer to handle, enable advertising.
      GapAdv_loadByHandle(advHandleLegacy, GAP_ADV_DATA_TYPE_ADV, sizeof(advertData), advertData);

      break;      
      
    default:
      // Do nothing.
      break;
  }
  // All events have associated memory to free except the insufficient memory
  // event
  if (pEventData->event != GAP_EVT_INSUFFICIENT_MEMORY)
  {
    ICall_free(pEventData->pBuf);
  }
}

Joshua Gascoigne said:

Also when i add the codes in this link i cannot see a data change in my BLE scanner! any idea how to correctly veiw the change in data?

I'm not sure what BLE Scanner you're using, but some applications fail to show the new packets of information. I used the SmartRF Packet Sniffer 2.

Please let me know if this helps!

Best,

Nima Behmanesh