UpnpBroadcastResponder.cpp

#include "UpnpBroadcastResponder.h"
#include "Switch.h"
#include <functional>
 
// Multicast declarations
IPAddress ipMulti(239, 255, 255, 250);
const unsigned int portMulti = 1900;
char packetBuffer[512];   

#define MAX_SWITCHES 14
Switch switches[MAX_SWITCHES] = {};
int numOfSwitchs = 0;

//#define numOfSwitchs (sizeof(switches)/sizeof(Switch)) //array size  
 
//<<constructor>>
UpnpBroadcastResponder::UpnpBroadcastResponder(){  
}
 
//<<destructor>>
UpnpBroadcastResponder::~UpnpBroadcastResponder(){/*nothing to destruct*/}
 
bool UpnpBroadcastResponder::beginUdpMulticast(){
  boolean state = false;
  #ifdef SER_DEBUG
    Serial.println("Begin multicast ..");
  #endif
  if(UDP.beginMulticast(WiFi.localIP(), ipMulti, portMulti)) {
    #ifdef SER_DEBUG
      Serial.print("Udp multicast server started at ");
      Serial.print(ipMulti);
      Serial.print(":");
      Serial.println(portMulti);
    #endif 
    state = true;
  }
  else{
    #ifdef SER_DEBUG
      Serial.println("Connection failed");
    #endif
  }
  
  return state;
}

//Switch *ptrArray;

void UpnpBroadcastResponder::addDevice(Switch& device) {
  #ifdef SER_DEBUG
    Serial.print("Adding switch: ");
    Serial.print(device.getAlexaInvokeName());
    Serial.print(" index : ");
    Serial.println(numOfSwitchs);
  #endif
  switches[numOfSwitchs] = device;
  numOfSwitchs++;
}

void UpnpBroadcastResponder::serverLoop(){
  int packetSize = UDP.parsePacket();
  if (packetSize <= 0)
    return;
  
  IPAddress senderIP = UDP.remoteIP();
  unsigned int senderPort = UDP.remotePort();
  
  // read the packet into the buffer
  UDP.read(packetBuffer, packetSize);
  
  // check if this is a M-SEARCH for WeMo device
  String request = String((char *)packetBuffer);

  if(request.indexOf('M-SEARCH') > 0) {
      if(request.indexOf("urn:Belkin:device:**") > 0) {
        #ifdef SER_DEBUG
          Serial.println("Got UDP Belkin Request..");
        #endif
        // int arrSize = sizeof(switchs) / sizeof(Switch);
      
        for(int n = 0; n < numOfSwitchs; n++) {
            Switch &sw = switches[n];

            if (&sw != NULL) {
              sw.respondToSearch(senderIP, senderPort);              
            }
        }
      }
  }
}