Updating _port to really used port and made _port accessible (#7003)

* Updating _port to really used port and made _port accessible

* 2. Try

Author: LaborEtArs

Diff for: libraries/ESP8266WiFi/src/WiFiServer.cpp

@@ -83,6 +83,7 @@ void WiFiServer::begin(uint16_t port) {
         return;
     }
     _pcb = listen_pcb;
+    _port = _pcb->local_port;
     tcp_accept(listen_pcb, &WiFiServer::_s_accept);
     tcp_arg(listen_pcb, (void*) this);
 }
@@ -126,6 +127,10 @@ uint8_t WiFiServer::status()  {
     return _pcb->state;
 }
 
+uint16_t WiFiServer::port() const {
+    return _port;
+}
+
 void WiFiServer::close() {
     if (!_pcb) {
       return;

Diff for: libraries/ESP8266WiFi/src/WiFiServer.h

@@ -58,6 +58,7 @@ class WiFiServer : public Server {
   virtual size_t write(uint8_t);
   virtual size_t write(const uint8_t *buf, size_t size);
   uint8_t status();
+  uint16_t port() const;
   void close();
   void stop();