Changed templates to include deviceType

Previously, the notify template and and response templates had a
hardcoded NT (or ST) of upnp:root device.  They now include the
deviceType that is set in initialization.

libraries/ESP8266SSDP/ESP8266SSDP.cpp

@@ -58,20 +58,19 @@ static const IPAddress SSDP_MULTICAST_ADDR(239, 255, 255, 250);
 
 static const char* _ssdp_response_template =
   "HTTP/1.1 200 OK\r\n"
-  "EXT:\r\n"
-  "ST: upnp:rootdevice\r\n";
+  "EXT:\r\n";
 
 static const char* _ssdp_notify_template =
   "NOTIFY * HTTP/1.1\r\n"
   "HOST: 239.255.255.250:1900\r\n"
-  "NT: upnp:rootdevice\r\n"
   "NTS: ssdp:alive\r\n";
 
 static const char* _ssdp_packet_template =
   "%s" // _ssdp_response_template / _ssdp_notify_template
   "CACHE-CONTROL: max-age=%u\r\n" // SSDP_INTERVAL
   "SERVER: Arduino/1.0 UPNP/1.1 %s/%s\r\n" // _modelName, _modelNumber
   "USN: uuid:%s\r\n" // _uuid
+  "%s: %s\r\n"
   "LOCATION: http://%u.%u.%u.%u:%u/%s\r\n" // WiFi.localIP(), _port, _schemaURL
   "\r\n";
 
@@ -207,6 +206,8 @@ void SSDPClass::_send(ssdp_method_t method){
     (method == NONE)?_ssdp_response_template:_ssdp_notify_template,
     SSDP_INTERVAL,
     _modelName, _modelNumber,
+    (method == NONE)?"ST":"NT",
+    _deviceType,
     _uuid,
     IP2STR(&ip), _port, _schemaURL
   );