add: extern unsigned long bip_get_addr(void); unsigned long broadcast_address = 0; unsigned long subnet_mask = 0;   broadcast_address = bip_get_addr(); broadcast_address |= ~(BIP_Subnet_Mask.s_addr);  bip_set_port(0xBAC0); #endif
context: int main(int argc, char *argv[]){  BACNET_ADDRESS src = {0};  // address where message came from  uint16_t pdu_len = 0;  unsigned timeout = 100; // milliseconds  (void)argc;  (void)argv;  Init_Device_Parameters();  Init_Service_Handlers();  // init the physical layer  #ifdef BACDL_BIP  NetInitialize();  bip_set_address(TargetIP[0], TargetIP[1], TargetIP[2], TargetIP[3]);  bip_set_address(NetMask[0], NetMask[1], NetMask[2], NetMask[3]);  if (!bip_init())    return 1;  #endif  #ifdef BACDL_ETHERNET  NetInitialize();  if (!ethernet_init(NULL))    return 1;  #endif  #ifdef BACDL_MSTP  RS485_Initialize();  MSTP_Init(&MSTP_Port,MSTP_MAC_Address);  #endif    // loop forever  for (;;)  {    // input    #ifdef BACDL_MSTP    MSTP_Millisecond_Timer(&MSTP_Port);    // note: also called by RS-485 Receive ISR    RS485_Check_UART_Data(&MSTP_Port);    MSTP_Receive_Frame_FSM(&MSTP_Port);    #endif    #if (defined(BACDL_ETHERNET) || defined(BACDL_BIP))    // returns 0 bytes on timeout    pdu_len = bacdl_receive(      &src,      &Rx_Buf[0],      MAX_MPDU,      timeout);    #endif    // process    if (pdu_len)    {      npdu_handler(        &src,        &Rx_Buf[0],        pdu_len);    }    if (I_Am_Request)    {      I_Am_Request = false;      Send_IAm();    }    // output    #ifdef BACDL_MSTP    MSTP_Master_Node_FSM(&MSTP_Port);    #endif    // blink LEDs, Turn on or off outputs, etc  }}