Run through and position a series of points - question is how can I stop in the middle?

swift_pro_example1.py

def set_position(self, x = None, y = None, z = None,
                         speed = 5000, relative = False,
                         wait = True, timeout = 10):
  if True != self.swift.set_position(x, y, z, speed, relative, wait, timeout):
    print("Set position failed!")

def raise_arm(self):
    self.swift.flush_cmd()
    self.set_position(z = self.RAISED_Z, relative = False)

def lower_arm(self):
  self.swift.flush_cmd()
  self.set_position(z = self.DRAWING_Z, relative = False)

# points is a 3-dimen array, like this:
points = [[[26,27],[26,36],[26,43],[26,52],[26,60],[26,65],[26,69],[26,72]],[[27,25],[30,25],[35,25],[39,25],[42,25],[46,25],[51,25],[55,25],[59,25],[62,25],[67,25],[73,25],[76,25]],[[58,50],[58,53],[58,57],[58,60],[58,64],[58,67]],[[52,46],[55,46],[58,46],[61,46],[64,46],[68,46],[71,46]],[[83,49],[83,52],[83,55],[83,58],[83,61],[83,64],[84,66],[87,66],[90,66],[95,66],[99,66],[102,66]],[[449,21],[452,21],[456,22],[458,23],[460,24],[464,24],[467,24],[469,25],[473,25],[475,26],[478,26],[480,29],[479,34],[478,39],[478,45],[478,49],[478,55],[478,59],[478,65],[478,69],[478,72]],[[474,446],[474,452],[474,456],[474,459],[474,463],[474,466],[474,469],[474,472],[474,475],[475,478],[472,479],[470,478],[465,478],[462,478],[458,477],[455,477],[452,477],[449,477],[447,478]],[[26,444],[26,447],[26,451],[26,454],[26,457],[26,460],[26,463],[26,467],[26,470],[26,473],[25,477],[30,477],[33,477],[37,477],[42,477],[46,477],[51,477],[55,477],[58,477],[62,477]]]

i = 0
while i < len(points):
  move_to_x, move_to_y = points[i][0]
  move_to_x = move_to_x - last_x
  move_to_y = move_to_y - last_y
  # reverse x & y for the robot
  set_position(x = move_to_y, y = move_to_x, relative = True)
  last_x, last_y = points[i][0]
  lower_arm()
  if len(points[i]) > 0:
    # we've moved to the first point, start drawing with the second point
    j = 1
    while j < len(points[i]):
      x, y = points[i][j]
      x = x - last_x
      y = y - last_y
      # reverse x & y for the robot
      set_position(x = y, y = x, relative = True)
      last_x, last_y = points[i][j]
      j += 1
  i += 1
  raise_arm()

Hello, did you find any solution for sudden stopping the uarm when several criterias are met? I'm sending serial commands to the uArm using Java, and I want the uArm to stop when it matches some coordinates, can you help me with that?