nd router's external IP (分享器), not your computer's IP (it should look like 192.168.0.xxx).
Here's a quick tutorial to find your "real" IP: https://www.youtube.com/watch?v=g6Eyj8pjrNU…
the u value should correspond to the number of points per row (3), not the total number of points (9). in this case, with your total of 9 points arranged 3x3 set the U input to "3" and it will work.