WEBENCH® Tools/CC2530: No. of devices can connect to network

What can i do to increase the number of device that  communicates to the coordinator??

Currently  we are working on home automation application using CC2530 & raspberrypi,

In our application we also have build our own automation app.

And when any body tap on any lights device icon from mobile app than following process done:

•  Raspberry pi send following command into function:  passing buffer

    0xDF(sync command) :1C:7F:C7:12:00:4B:12:00 (module ID): 0x01(on/off command): 01(switch number 1-5): 01(relay status 01 - on,00-off)

   Than coordinator get  short address by passing MAC add into APSME_LookupNwkAddr api and send data OTA to that short-address device.

   So when I do communication on short address I can not communicates around more than approx 19 devices as NWK_MAX_DEVICE_LIST 20 in nwk_globals.h

   I think if i do communicate using MAC address than I can communicates to more number of devices??? Am i right??

static void DEEPMacToNet(uint8 *TXbuff, uint16 TXlength)

{

  if(APSME_LookupNwkAddr(&TXbuff[1],&temp_NwkAddr)==TRUE) 
  {
    TXbuff[0]=0xDF;
    TXbuff[1]=temp_NwkAddr>>8;
    TXbuff[2]=temp_NwkAddr;

    for(char i=3; i<TXlength-6;i++)
    {
      TXbuff[i]=TXbuff[i+6];
    }

    GenericApp_DstAddr.addrMode = (afAddrMode_t)Addr16Bit;
    GenericApp_DstAddr.endPoint = GENERICAPP_ENDPOINT;
    GenericApp_DstAddr.addr.shortAddr = temp_NwkAddr;

     if ( AF_DataRequest(&GenericApp_DstAddr, &GenericApp_epDesc,GENERICAPP_CLUSTERID,(TXlength-6),TXbuff,
     &GenericApp_TransID,(AF_DISCV_ROUTE/* | AF_ACK_REQUEST*/),AF_DEFAULT_RADIUS)==afStatus_SUCCESS )
    {
      LED = ~LED;
      milliSecondDelay(10);
    }
  }
}