コード例 #1
0
ファイル: lorawan.go プロジェクト: TheThingsNetwork/ttn
// Bytes returns the bytes
func (m *Message) Bytes() []byte {
	if m.FPort == 0 {
		m.FPort = 1
	}
	macPayload := &lorawan.MACPayload{}
	macPayload.FHDR = lorawan.FHDR{
		DevAddr: lorawan.DevAddr(m.devAddr),
		FCnt:    uint32(m.FCnt),
	}
	macPayload.FPort = pointer.Uint8(uint8(m.FPort))
	macPayload.FRMPayload = []lorawan.Payload{&lorawan.DataPayload{Bytes: m.Payload}}
	phyPayload := &lorawan.PHYPayload{}
	phyPayload.MHDR = lorawan.MHDR{
		MType: lorawan.UnconfirmedDataUp,
		Major: lorawan.LoRaWANR1,
	}
	if m.confirmed {
		phyPayload.MHDR.MType = lorawan.ConfirmedDataUp
	}
	phyPayload.MACPayload = macPayload
	phyPayload.EncryptFRMPayload(lorawan.AES128Key(m.appSKey))
	phyPayload.SetMIC(lorawan.AES128Key(m.nwkSKey))
	uplinkBytes, _ := phyPayload.MarshalBinary()
	return uplinkBytes
}
コード例 #2
0
func (h *handler) ConvertToLoRaWAN(ctx log.Interface, appDown *types.DownlinkMessage, ttnDown *pb_broker.DownlinkMessage) error {
	// Find Device
	dev, err := h.devices.Get(appDown.AppID, appDown.DevID)
	if err != nil {
		return err
	}

	// LoRaWAN: Unmarshal Downlink
	var phyPayload lorawan.PHYPayload
	err = phyPayload.UnmarshalBinary(ttnDown.Payload)
	if err != nil {
		return err
	}
	macPayload, ok := phyPayload.MACPayload.(*lorawan.MACPayload)
	if !ok {
		return errors.NewErrInvalidArgument("Downlink", "does not contain a MAC payload")
	}
	if ttnDown.DownlinkOption != nil && ttnDown.DownlinkOption.ProtocolConfig.GetLorawan() != nil {
		macPayload.FHDR.FCnt = ttnDown.DownlinkOption.ProtocolConfig.GetLorawan().FCnt
	}

	// Abort when downlink not needed
	if len(appDown.PayloadRaw) == 0 && !macPayload.FHDR.FCtrl.ACK && len(macPayload.FHDR.FOpts) == 0 {
		return ErrNotNeeded
	}

	// Set FPort
	if appDown.FPort != 0 {
		macPayload.FPort = &appDown.FPort
	}

	// Set Payload
	if len(appDown.PayloadRaw) > 0 {
		macPayload.FRMPayload = []lorawan.Payload{&lorawan.DataPayload{Bytes: appDown.PayloadRaw}}
		if macPayload.FPort == nil || *macPayload.FPort == 0 {
			macPayload.FPort = pointer.Uint8(1)
		}
	} else {
		macPayload.FRMPayload = []lorawan.Payload{}
	}

	// Encrypt
	err = phyPayload.EncryptFRMPayload(lorawan.AES128Key(dev.AppSKey))
	if err != nil {
		return err
	}

	// Set MIC
	err = phyPayload.SetMIC(lorawan.AES128Key(dev.NwkSKey))
	if err != nil {
		return err
	}

	// Marshal
	phyPayloadBytes, err := phyPayload.MarshalBinary()
	if err != nil {
		return err
	}

	ttnDown.Payload = phyPayloadBytes

	return nil
}