added listeners for pingSent and pongReceived

src/internal/sio_client_impl.cpp

@@ -301,6 +301,10 @@ namespace sio
             m_ping_timeout_timer->expires_from_now(milliseconds(m_ping_timeout), timeout_ec);
             m_ping_timeout_timer->async_wait(lib::bind(&client_impl::timeout_pong, this,lib::placeholders::_1));
         }
+        if(m_ping_sent_listener)
+        {
+            m_ping_sent_listener();
+        }
     }
 
     void client_impl::timeout_pong(const boost::system::error_code &ec)
@@ -505,6 +509,10 @@ namespace sio
             m_ping_timeout_timer->cancel();
             m_ping_timeout_timer.reset();
         }
+        if(m_pong_received_listener)
+        {
+            m_pong_received_listener();
+        }
     }
 
     void client_impl::on_decode(packet const& p)

src/internal/sio_client_impl.h

@@ -64,6 +64,10 @@ namespace sio
     void set_##__FIELD__(__TYPE__ const& l) \
         { m_##__FIELD__ = l;}
 
+        SYNTHESIS_SETTER(client::con_listener,ping_sent_listener)
+
+        SYNTHESIS_SETTER(client::con_listener,pong_received_listener)
+
         SYNTHESIS_SETTER(client::con_listener,open_listener)
 
         SYNTHESIS_SETTER(client::con_listener,fail_listener)
@@ -83,6 +87,9 @@ namespace sio
 
         void clear_con_listeners()
         {
+            m_ping_sent_listener = nullptr;
+            m_pong_received_listener = nullptr;
+
             m_open_listener = nullptr;
             m_close_listener = nullptr;
             m_fail_listener = nullptr;
@@ -200,6 +207,9 @@ namespace sio
 
         con_state m_con_state;
 
+        client::con_listener m_ping_sent_listener;
+        client::con_listener m_pong_received_listener;
+
         client::con_listener m_open_listener;
         client::con_listener m_fail_listener;
         client::con_listener m_reconnecting_listener;

src/sio_client.cpp

@@ -23,6 +23,16 @@ namespace sio
         delete m_impl;
     }
 
+    void client::set_ping_sent_listener(con_listener const& l)
+    {
+        m_impl->set_ping_sent_listener(l);
+    }
+
+    void client::set_pong_received_listener(con_listener const& l)
+    {
+        m_impl->set_pong_received_listener(l);
+    }
+
     void client::set_open_listener(con_listener const& l)
     {
         m_impl->set_open_listener(l);

src/sio_client.h

@@ -35,6 +35,10 @@ namespace sio
         ~client();
 
         //set listeners and event bindings.
+        void set_ping_sent_listener(con_listener const& l);
+
+        void set_pong_received_listener(con_listener const& l);
+
         void set_open_listener(con_listener const& l);
 
         void set_fail_listener(con_listener const& l);