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There is a way to "disconnect" UDP socket
that was previously "connected" to specific
remote endpoint in C:
 struct sockaddr_in sin; 
 memset((char *)&sin, 0, sizeof(sin));
 sin.sin_family = AF_UNSPEC;
 connect(fd, (struct sockaddr *)&sin, sizeof(sin));
However in this is not available in python, since connect
accepts only (host, port) as a parameter for UDP socket.
It's possible to drop "port" connection with port=0,
however I can't find a way to drop "host" connection.