CC2640R2F: Can the simple_central display device name during scanning and connection?

Hi, Marie,

Your answer makes me a little confuse. I check the advertData[] in simple_peripheral.c. There is no device name data. I show the code in below:

static uint8_t advertData[] =
{
  // Flags: this field sets the device to use general discoverable
  // mode (advertises indefinitely) instead of general
  // discoverable mode (advertise for 30 seconds at a time)
  0x02,   // length of this data
  GAP_ADTYPE_FLAGS,
  DEFAULT_DISCOVERABLE_MODE | GAP_ADTYPE_FLAGS_BREDR_NOT_SUPPORTED,

  // service UUID, to notify central devices what services are included
  // in this peripheral
  0x03,   // length of this data
  GAP_ADTYPE_16BIT_MORE,      // some of the UUID's, but not all
  LO_UINT16(SIMPLEPROFILE_SERV_UUID),
  HI_UINT16(SIMPLEPROFILE_SERV_UUID)
};

However, the device name is in the scanRspData[] and attDeviceName[GAP_DEVICE_NAME_LEN]. The device is advertising its name, if I use my mobile phone to scan the device, I can see it. However, the simple_central project does not show me any simple_peripheral device name. I think it use the device MAC address + UUID to recognize different devices, but not the device name.

I also check the SimpleCentral_findSvcUuid() in simple_central.c. The code is very short. I can only find that it try to search the UUID, but I can not find any code for searching device name of the simple_peripheral. I also put this code in below:

static bool SimpleCentral_findSvcUuid(uint16_t uuid, uint8_t *pData,uint8_t dataLen)
{
  uint8_t adLen;
  uint8_t adType;
  uint8_t *pEnd;

  pEnd = pData + dataLen - 1;

  // While end of data not reached
  while (pData < pEnd)
  {
    // Get length of next AD item
    adLen = *pData++;
    if (adLen > 0)
    {
      adType = *pData;

      // If AD type is for 16-bit service UUID
      if ((adType == GAP_ADTYPE_16BIT_MORE) ||
          (adType == GAP_ADTYPE_16BIT_COMPLETE))
      {
        pData++;
        adLen--;

        // For each UUID in list
        while (adLen >= 2 && pData < pEnd)
        {
          // Check for match
          if ((pData[0] == LO_UINT16(uuid)) && (pData[1] == HI_UINT16(uuid)))
          {
            // Match found
            return TRUE;
          }

          // Go to next
          pData += 2;
          adLen -= 2;
        }

        // Handle possible erroneous extra byte in UUID list
        if (adLen == 1)
        {
          pData++;
        }
      }
      else
      {
        // Go to next item
        pData += adLen;
      }
    }
  }

  // Match not found
  return FALSE;
}

Is there any other evidence to show that the Simple_central can get device name?

Regards, Robert

Hi, Marie,

Thanks for your explain. I know what do you mead and the GAP_ADTYPE_LOCAL_NAME_COMPLETE flag can check whether the advertisement data type. However, I still do not know how to get the device name. In the SimpleCentral_findSvcUuid(), the UUID value looks like from pData[0] and pData[1]. Could you tell me where I can find the device name from? I am a stranger of TI development board. I need more detail. Sorry about my foolish.

Hi, Marie,

Maybe I have not understand the code. I guess in SimpleCentral_findSvcUuid(), the GAP_ADTYPE_16BIT_COMPLETE flag just check the UUID is transformed correct or not. Then, the pData[0] and pData[1] are the UUID values. Because the UUID from simple_peripheral is 16 bits, so there are only 2 byes to match. Please check whether my concept is correct or not.

If I am right, GAP_ADTYPE_LOCAL_NAME_COMPLETE is not enough for me to get the device name. Do you think if I change code below can get the device name?

if (adType == GAP_ADTYPE_LOCAL_NAME_COMPLETE)
{ Display_print1(dispHandle, 5, 0, "Peripheral name: %s", Util_convertBytes2Str(pData));
}

I don't think I can display the device name to PC UART. The pData[] is just a pointer parameter of the function. It is called by SimpleCentral_processRoleEvent() function. In this function, it pass pEvent->deviceInfo.pEvtData to the pData[] of SimpleCentral_findSvcUuid(). My question is that in SimpleCentral_processRoleEvent(), the "deviceInfo.pEvtData" is UUID; the "deviceInfo.dataLen" is the information length. Then, what "deviceInfo.??" is the device name which I can use to build a function to display?

I hope you realize my knowledge limitation and understand my question.

Regards, Robert