MFC mfc=(MFC)ch.getProtocolStack().findProtocol(MFC.class);
if(mfc == null) {
System.err.println("MFC not found");
break;
}
System.out.println(mfc.printCredits());
break;
case '5':
UFC ufc=(UFC)ch.getProtocolStack().findProtocol(UFC.class);
if(ufc == null) {
System.err.println("UFC not found");