No need to sleep initially.

Add some sane defaults for black belt and normal light (WIP).

oi-sensor/oi-sensor.py

@@ -38,23 +38,20 @@ async def main():
     await myvar.set_writable()
 
     # init camera
-    cap = cv2.VideoCapture(0)
+    cap = cv2.VideoCapture(2)
     cv2.namedWindow("Trackbars")
     cv2.createTrackbar("L-H", "Trackbars", 0, 180, nothing)
     cv2.createTrackbar("L-S", "Trackbars", 0, 255, nothing)
     cv2.createTrackbar("L-V", "Trackbars", 3, 255, nothing)
-    cv2.createTrackbar("U-H", "Trackbars", 39, 180, nothing)
-    cv2.createTrackbar("U-S", "Trackbars", 155, 255, nothing)
-    cv2.createTrackbar("U-V", "Trackbars", 148, 255, nothing)
+    cv2.createTrackbar("U-H", "Trackbars", 135, 180, nothing)
+    cv2.createTrackbar("U-S", "Trackbars", 190, 255, nothing)
+    cv2.createTrackbar("U-V", "Trackbars", 190, 255, nothing)
     font = cv2.FONT_HERSHEY_COMPLEX
 
     _logger.info("Starting server!")
     async with server:
 
         while True:
-            # XXX: find out why we need to sleep (otherwise OPC UA server stops work)
-            await asyncio.sleep(0.0001)
-
             # read and process camera 
             _, frame = cap.read()
             hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)