fprintf(stderr," -npn_client - have client side offer NPN\n");
fprintf(stderr," -npn_server - have server side offer NPN\n");
fprintf(stderr," -npn_server_reject - have server reject NPN\n");
fprintf(stderr," -npn_client - have client side offer NPN\n");
fprintf(stderr," -npn_server - have server side offer NPN\n");
fprintf(stderr," -npn_server_reject - have server reject NPN\n");