Change client_impl::send_impl() not to delay ping

client_impl::close_impl() only gets called when the user is closing the
connection ("End by user"), when there is a handshake error, when the
server sends a frame_close packet ("End by server"), or when there is a
pong timeout.

Before, in the case where send_impl() would continously get called with
an interval less than client_impl::m_ping_interval, a disconnect due to
network problems would never be detected because the ping would keep
getting delayed, thus never allowing the pong timeout to happen. This
fixes that by not delaying pings.

Author: Chris Grahn

src/internal/sio_client_impl.cpp

@@ -264,13 +264,6 @@ namespace sio
     {
         if(m_con_state == con_opened)
         {
-            //delay the ping, since we already have message to send.
-            boost::system::error_code timeout_ec;
-            if(m_ping_timer)
-            {
-                m_ping_timer->expires_from_now(milliseconds(m_ping_interval),timeout_ec);
-                m_ping_timer->async_wait(lib::bind(&client_impl::ping,this,lib::placeholders::_1));
-            }
             lib::error_code ec;
             m_client.send(m_con,*payload_ptr,opcode,ec);
             if(ec)