How to get the underlying socket gracefully?

[seesky]

After using libjuice to create a UDP connection, how do I obtain the selected sockets, ipaddres, and udp ports on the local and remote ends?
I want to use the socket data directly after the connection is successful, rather than using the juice_send method that comes with libjuice.
After obtaining the selected socket, address, and port, I will use them to establish UDT(http://udt.sourceforge.net/) communication for more efficient UDP transport.

[paullouisageneau]

The API doesn't allow the user to access the underlying socket because the library needs to demultiplex and answer STUN requests, see #238