package protocol

import (
	"git.noahlan.cn/noahlan/nnet/packet"
)

type (
	Packet interface {
		packet.IPacket
		Copy() Packet
		Modbus
		SetBody(data []byte)
		SetError(err *MError)
	}

	Modbus interface {
		GetFunction() uint8
		GetAddress() uint8
	}

	ModbusHeader struct {
		Address  uint8
		Function uint8
	}
)

func GetError(pkg Packet) (err MError) {
	function := pkg.GetFunction()
	if (function & 0x80) != 0 {
		err = MError(pkg.GetBody()[0])
	}
	return
}