code: func (c *Client) SendDecline(acknowledgementPacket *dhcp4.Packet) (dhcp4.Packet, error) {
  	declinePacket := c.DeclinePacket(acknowledgementPacket)
  	declinePacket.PadToMinSize()
  
  	return declinePacket, c.SendPacket(declinePacket)
  }
docs: //Send Decline to the received acknowledgement.