allow specifying serial device

e32_client/ugv.py

@@ -103,9 +103,13 @@ class UGVComms(E32):
                 continue
 
 def main():
-    ser = serial.serial_for_url("/dev/ttyUSB2", baudrate=9600, parity=serial.PARITY_NONE,
+    if len(sys.argv) >= 2:
+        ser_url = sys.argv[1]
+    else:
+        ser_url = "hwgrep://"
+    ser = serial.serial_for_url(ser_url, baudrate=9600, parity=serial.PARITY_NONE,
                                 stopbits=serial.STOPBITS_ONE, bytesize=serial.EIGHTBITS,
-                                timeout=2.0)
+                                timeout=1.0)
     ugv = UGVComms(ser)
     ugv.start()
     time.sleep(0.2)