Changes to make interactive mode use nicer - no RECV message on recv timeout

printcore.py

@@ -54,6 +54,7 @@ class printcore():
             if(not self.printer or not self.printer.isOpen):
                 break
             line=self.printer.readline()
+            if(len(line)>1):
                 print "RECV:",line
             if(line.startswith('start')):
                 self.clear=True