tracker manual positioning commands

def cmd_tracker_position(self, args):
        '''tracker manual positioning commands'''
        connection = self.find_connection()
        if not connection:
            print("No antenna tracker found")
            return
        positions = [0, 0, 0, 0, 0] # x, y, z, r, buttons. only position[0] (yaw) and position[1] (pitch) are currently used
        for i in range(0, 4):
            if len(args) > i:
                positions[i] = int(args[i]) # default values are 0
        connection.mav.manual_control_send(connection.target_system,
                                           positions[0], positions[1],
                                           positions[2], positions[3],
                                           positions[4])