Add a new mode of operation which will disable camera integration

(for testing purposes).

oi-sensor/oi-sensor.py

@@ -40,6 +40,7 @@ a('--ipv4', help='The IPv4 address on which the OPC UA server runs', default="0.
 a('--port', help='The port on which the OPC UA server runs', default="4840")
 a('--camera', help='The index of the camera (i.e. indxed in /dev/videoX)', default=0)
 a('--headless', help='Run without screen in a headless mode (boolean, default=0)', default=False)
+a('--mode', help='Mode of operation. The default is to read data from camera device. If set to 1 do NOT read data from camera device. (default=0)', default=0)
 # XXX: allow to specify from CLI DEFAULT_LH & friends
 
 args = parser.parse_args()
@@ -47,6 +48,7 @@ ipv4 = args.ipv4
 port = args.port
 camera = int(args.camera)
 headless = bool(int(args.headless))
+mode = bool(int(args.mode))
 
 def nothing(x):
     # any operation
@@ -74,6 +76,7 @@ async def main():
     result_stack = []
     current_shape = 0.0
 
+    if not mode:
         # init camera
         cap = cv2.VideoCapture(camera)
         font = cv2.FONT_HERSHEY_COMPLEX
@@ -97,6 +100,7 @@ async def main():
             # recognition. Thus give (roughly) some CPU time so both can work together.
             await asyncio.sleep(SLEEP_DURATION)
 
+            if not mode:
                 before = time.time() * 1000
                 # read and process camera 
                 _, frame = cap.read()