add get sub port

bin/getUSBport.py

@@ -0,0 +1,15 @@
+#!/usr/bin/env python
+
+import sys
+import labhw
+
+
+name = 'Arduino__www_arduino_cc__75833353035351903182'
+name = sys.argv[1]
+
+devices = labhw.list_USB_devices()
+
+try:
+    print(devices[name])
+except KeyError as e:
+    raise RuntimeError(f"unknown device {name}")