docs: def move(self, pos):
          """Move cam to given preset position.
          pos - must be within 1 to 16.
          Returns: CamException in case of errors, "ok" otherwise."""
  
          try:
              payload = {"address":self.address, "user": self.user, "pwd": self.pswd, "pos": map_position(pos)}
              resp = requests.get(
                      "http://{address}/decoder_control.cgi?command={pos}&user={user}&pwd={pwd}".format(**payload)
              )
          except KeyError:
              raise CamException("Position must be within 1 to 16.")
          if resp.status_code != 200:
              raise CamException("Unauthorized. Wrong user or password.")
          return "ok"