fix captive portal espressif#1037

Not sure if this was left out on purpose or not

Author: tablatronix

libraries/DNSServer/src/DNSServer.cpp

@@ -123,10 +123,21 @@ void DNSServer::replyWithIP()
   if (_buffer == NULL) return;
   _dnsHeader->QR = DNS_QR_RESPONSE;
   _dnsHeader->ANCount = _dnsHeader->QDCount;
-  _dnsHeader->QDCount = 0;
+  _dnsHeader->QDCount = _dnsHeader->QDCount; 
+  // _dnsHeader->QDCount = 0;
 
   _udp.beginPacket(_udp.remoteIP(), _udp.remotePort());
   _udp.write(_buffer, _currentPacketSize);
+
+  _udp.write((uint8_t)192); //  answer name is a pointer
+  _udp.write((uint8_t)12);  // pointer to offset at 0x00c
+
+  _udp.write((uint8_t)0);   // 0x0001  answer is type A query (host address)
+  _udp.write((uint8_t)1);
+
+  _udp.write((uint8_t)0);   //0x0001 answer is class IN (internet address)
+  _udp.write((uint8_t)1);
+  
   _udp.write((unsigned char*)&_ttl, 4);
   _udp.write((uint8_t)0);
   _udp.write((uint8_t)4);