def handle_unpause_physics(self, req):
    'unpause simulation, lower flag to allow pybullet to execute self.pb.stepSimulation()'
    self.get_logger().info('unpausing simulation')
    self.pause_simulation = True
    return []
unpause simulation, lower flag to allow pybullet to execute self.pb.stepSimulation()
def handle_unpause_physics(self, req):
    
    self.get_logger().info('unpausing simulation')
    self.pause_simulation = True
    return []