// newReferenceUplink returns a default uplink message
func newReferenceUplink() *pb.UplinkMessage {
gtwID := "eui-0102030405060708"
phy := lorawan.PHYPayload{
MHDR: lorawan.MHDR{
MType: lorawan.UnconfirmedDataUp,
Major: lorawan.LoRaWANR1,
},
MACPayload: &lorawan.MACPayload{
FHDR: lorawan.FHDR{
DevAddr: lorawan.DevAddr([4]byte{1, 2, 3, 4}),
},
},
}
bytes, _ := phy.MarshalBinary()
up := &pb.UplinkMessage{
Payload: bytes,
ProtocolMetadata: &pb_protocol.RxMetadata{Protocol: &pb_protocol.RxMetadata_Lorawan{Lorawan: &pb_lorawan.Metadata{
CodingRate: "4/5",
DataRate: "SF7BW125",
Modulation: pb_lorawan.Modulation_LORA,
}}},
GatewayMetadata: &pb_gateway.RxMetadata{
GatewayId: gtwID,
Timestamp: 100,
Frequency: 868100000,
Rssi: -25.0,
Snr: 5.0,
},
}
return up
}
func (n *networkServer) HandleDownlink(message *pb_broker.DownlinkMessage) (*pb_broker.DownlinkMessage, error) {
// Get Device
dev, err := n.devices.Get(*message.AppEui, *message.DevEui)
if err != nil {
return nil, err
}
n.status.downlink.Mark(1)
dev.StartUpdate()
if dev.AppID != message.AppId || dev.DevID != message.DevId {
return nil, errors.NewErrInvalidArgument("Downlink", "AppID and DevID do not match AppEUI and DevEUI")
}
// Unmarshal LoRaWAN Payload
var phyPayload lorawan.PHYPayload
err = phyPayload.UnmarshalBinary(message.Payload)
if err != nil {
return nil, err
}
macPayload, ok := phyPayload.MACPayload.(*lorawan.MACPayload)
if !ok {
return nil, errors.NewErrInvalidArgument("Downlink", "does not contain a MAC payload")
}
// Set DevAddr
macPayload.FHDR.DevAddr = lorawan.DevAddr(dev.DevAddr)
// FIRST set and THEN increment FCntDown
// TODO: For confirmed downlink, FCntDown should be incremented AFTER ACK
macPayload.FHDR.FCnt = dev.FCntDown
dev.FCntDown++
err = n.devices.Set(dev)
if err != nil {
return nil, err
}
// Sign MIC
phyPayload.SetMIC(lorawan.AES128Key(dev.NwkSKey))
// Update message
bytes, err := phyPayload.MarshalBinary()
if err != nil {
return nil, err
}
message.Payload = bytes
return message, nil
}
func doTestHandleActivation(h *handler, appEUI types.AppEUI, devEUI types.DevEUI, devNonce [2]byte, appKey types.AppKey) (*pb.DeviceActivationResponse, error) {
devAddr := types.DevAddr{1, 2, 3, 4}
requestPHY := lorawan.PHYPayload{
MHDR: lorawan.MHDR{
MType: lorawan.JoinRequest,
Major: lorawan.LoRaWANR1,
},
MACPayload: &lorawan.JoinRequestPayload{
AppEUI: lorawan.EUI64(appEUI),
DevEUI: lorawan.EUI64(devEUI),
DevNonce: devNonce,
},
}
requestPHY.SetMIC(lorawan.AES128Key(appKey))
requestBytes, _ := requestPHY.MarshalBinary()
responsePHY := lorawan.PHYPayload{
MHDR: lorawan.MHDR{
MType: lorawan.JoinAccept,
Major: lorawan.LoRaWANR1,
},
MACPayload: &lorawan.JoinAcceptPayload{},
}
templateBytes, _ := responsePHY.MarshalBinary()
return h.HandleActivation(&pb_broker.DeduplicatedDeviceActivationRequest{
Payload: requestBytes,
AppEui: &appEUI,
AppId: appEUI.String(),
DevEui: &devEUI,
DevId: devEUI.String(),
ActivationMetadata: &pb_protocol.ActivationMetadata{Protocol: &pb_protocol.ActivationMetadata_Lorawan{
Lorawan: &pb_lorawan.ActivationMetadata{
DevAddr: &devAddr,
},
}},
ResponseTemplate: &pb_broker.DeviceActivationResponse{
Payload: templateBytes,
},
})
}
func TestHandleDownlink(t *testing.T) {
a := New(t)
ns := &networkServer{
devices: device.NewRedisDeviceStore(GetRedisClient(), "test-handle-downlink"),
}
ns.InitStatus()
appEUI := types.AppEUI(getEUI(1, 2, 3, 4, 5, 6, 7, 8))
devEUI := types.DevEUI(getEUI(1, 2, 3, 4, 5, 6, 7, 8))
devAddr := getDevAddr(1, 2, 3, 4)
// Device Not Found
message := &pb_broker.DownlinkMessage{
AppEui: &appEUI,
DevEui: &devEUI,
Payload: []byte{},
}
_, err := ns.HandleDownlink(message)
a.So(err, ShouldNotBeNil)
ns.devices.Set(&device.Device{
DevAddr: devAddr,
AppEUI: appEUI,
DevEUI: devEUI,
})
defer func() {
ns.devices.Delete(appEUI, devEUI)
}()
// Invalid Payload
message = &pb_broker.DownlinkMessage{
AppEui: &appEUI,
DevEui: &devEUI,
Payload: []byte{},
}
_, err = ns.HandleDownlink(message)
a.So(err, ShouldNotBeNil)
fPort := uint8(3)
phy := lorawan.PHYPayload{
MHDR: lorawan.MHDR{
MType: lorawan.UnconfirmedDataDown,
Major: lorawan.LoRaWANR1,
},
MACPayload: &lorawan.MACPayload{
FPort: &fPort,
FHDR: lorawan.FHDR{
FCtrl: lorawan.FCtrl{
ACK: true,
},
},
},
}
bytes, _ := phy.MarshalBinary()
message = &pb_broker.DownlinkMessage{
AppEui: &appEUI,
DevEui: &devEUI,
Payload: bytes,
}
res, err := ns.HandleDownlink(message)
a.So(err, ShouldBeNil)
var phyPayload lorawan.PHYPayload
phyPayload.UnmarshalBinary(res.Payload)
macPayload, _ := phyPayload.MACPayload.(*lorawan.MACPayload)
a.So(*macPayload.FPort, ShouldEqual, 3)
a.So(macPayload.FHDR.DevAddr, ShouldEqual, lorawan.DevAddr{1, 2, 3, 4})
a.So(macPayload.FHDR.FCnt, ShouldEqual, 0) // The first Frame counter is zero
a.So(phyPayload.MIC, ShouldNotEqual, [4]byte{0, 0, 0, 0}) // MIC should be set, we'll check it with actual examples in the integration test
dev, _ := ns.devices.Get(appEUI, devEUI)
a.So(dev.FCntDown, ShouldEqual, 1)
}
func TestHandleUplink(t *testing.T) {
a := New(t)
ns := &networkServer{
devices: device.NewRedisDeviceStore(GetRedisClient(), "ns-test-handle-uplink"),
}
ns.InitStatus()
appEUI := types.AppEUI(getEUI(1, 2, 3, 4, 5, 6, 7, 8))
devEUI := types.DevEUI(getEUI(1, 2, 3, 4, 5, 6, 7, 8))
devAddr := getDevAddr(1, 2, 3, 4)
// Device Not Found
message := &pb_broker.DeduplicatedUplinkMessage{
AppEui: &appEUI,
DevEui: &devEUI,
Payload: []byte{},
}
_, err := ns.HandleUplink(message)
a.So(err, ShouldNotBeNil)
ns.devices.Set(&device.Device{
DevAddr: devAddr,
AppEUI: appEUI,
DevEUI: devEUI,
})
defer func() {
ns.devices.Delete(appEUI, devEUI)
}()
// Invalid Payload
message = &pb_broker.DeduplicatedUplinkMessage{
AppEui: &appEUI,
DevEui: &devEUI,
Payload: []byte{},
}
_, err = ns.HandleUplink(message)
a.So(err, ShouldNotBeNil)
phy := lorawan.PHYPayload{
MHDR: lorawan.MHDR{
MType: lorawan.UnconfirmedDataUp,
Major: lorawan.LoRaWANR1,
},
MACPayload: &lorawan.MACPayload{
FHDR: lorawan.FHDR{
DevAddr: lorawan.DevAddr([4]byte{1, 2, 3, 4}),
FCnt: 1,
FCtrl: lorawan.FCtrl{
ADR: true,
ADRACKReq: true,
},
FOpts: []lorawan.MACCommand{
lorawan.MACCommand{CID: lorawan.LinkCheckReq},
},
},
},
}
bytes, _ := phy.MarshalBinary()
// Valid Uplink
message = &pb_broker.DeduplicatedUplinkMessage{
AppEui: &appEUI,
DevEui: &devEUI,
Payload: bytes,
ResponseTemplate: &pb_broker.DownlinkMessage{},
GatewayMetadata: []*pb_gateway.RxMetadata{
&pb_gateway.RxMetadata{},
},
ProtocolMetadata: &pb_protocol.RxMetadata{Protocol: &pb_protocol.RxMetadata_Lorawan{
Lorawan: &pb_lorawan.Metadata{
DataRate: "SF7BW125",
},
}},
}
res, err := ns.HandleUplink(message)
a.So(err, ShouldBeNil)
a.So(res.ResponseTemplate, ShouldNotBeNil)
// LoRaWAN: Unmarshal
var phyPayload lorawan.PHYPayload
phyPayload.UnmarshalBinary(res.ResponseTemplate.Payload)
macPayload, _ := phyPayload.MACPayload.(*lorawan.MACPayload)
// ResponseTemplate DevAddr should match
a.So([4]byte(macPayload.FHDR.DevAddr), ShouldEqual, [4]byte(devAddr))
// ResponseTemplate should ACK the ADRACKReq
a.So(macPayload.FHDR.FCtrl.ACK, ShouldBeTrue)
a.So(macPayload.FHDR.FOpts, ShouldHaveLength, 1)
a.So(macPayload.FHDR.FOpts[0].Payload, ShouldResemble, &lorawan.LinkCheckAnsPayload{GwCnt: 1, Margin: 7})
// Frame Counter should have been updated
dev, _ := ns.devices.Get(appEUI, devEUI)
a.So(dev.FCntUp, ShouldEqual, 1)
a.So(time.Now().Sub(dev.LastSeen), ShouldBeLessThan, 1*time.Second)
}
func (b *broker) HandleActivation(activation *pb.DeviceActivationRequest) (res *pb.DeviceActivationResponse, err error) {
ctx := b.Ctx.WithFields(log.Fields{
"GatewayID": activation.GatewayMetadata.GatewayId,
"AppEUI": *activation.AppEui,
"DevEUI": *activation.DevEui,
})
start := time.Now()
defer func() {
if err != nil {
ctx.WithError(err).Warn("Could not handle activation")
} else {
ctx.WithField("Duration", time.Now().Sub(start)).Info("Handled activation")
}
}()
time := time.Now()
b.status.activations.Mark(1)
// De-duplicate uplink messages
duplicates := b.deduplicateActivation(activation)
if len(duplicates) == 0 {
return nil, errDuplicateActivation
}
b.status.activationsUnique.Mark(1)
base := duplicates[0]
// Collect GatewayMetadata and DownlinkOptions
var gatewayMetadata []*gateway.RxMetadata
var downlinkOptions []*pb.DownlinkOption
var deviceActivationResponse *pb.DeviceActivationResponse
for _, duplicate := range duplicates {
gatewayMetadata = append(gatewayMetadata, duplicate.GatewayMetadata)
downlinkOptions = append(downlinkOptions, duplicate.DownlinkOptions...)
}
// Select best DownlinkOption
if len(downlinkOptions) > 0 {
deviceActivationResponse = &pb.DeviceActivationResponse{
DownlinkOption: selectBestDownlink(downlinkOptions),
}
}
// Build Uplink
deduplicatedActivationRequest := &pb.DeduplicatedDeviceActivationRequest{
Payload: base.Payload,
DevEui: base.DevEui,
AppEui: base.AppEui,
ProtocolMetadata: base.ProtocolMetadata,
GatewayMetadata: gatewayMetadata,
ActivationMetadata: base.ActivationMetadata,
ServerTime: time.UnixNano(),
ResponseTemplate: deviceActivationResponse,
}
// Send Activate to NS
deduplicatedActivationRequest, err = b.ns.PrepareActivation(b.Component.GetContext(b.nsToken), deduplicatedActivationRequest)
if err != nil {
return nil, errors.Wrap(errors.FromGRPCError(err), "NetworkServer refused to prepare activation")
}
ctx = ctx.WithFields(log.Fields{
"AppID": deduplicatedActivationRequest.AppId,
"DevID": deduplicatedActivationRequest.DevId,
})
// Find Handler (based on AppEUI)
var announcements []*pb_discovery.Announcement
announcements, err = b.Discovery.GetAllHandlersForAppID(deduplicatedActivationRequest.AppId)
if err != nil {
return nil, err
}
if len(announcements) == 0 {
return nil, errors.NewErrNotFound(fmt.Sprintf("Handler for AppID %s", deduplicatedActivationRequest.AppId))
}
ctx = ctx.WithField("NumHandlers", len(announcements))
// LoRaWAN: Unmarshal and prepare version without MIC
var phyPayload lorawan.PHYPayload
err = phyPayload.UnmarshalBinary(deduplicatedActivationRequest.Payload)
if err != nil {
return nil, err
}
correctMIC := phyPayload.MIC
phyPayload.MIC = [4]byte{0, 0, 0, 0}
phyPayloadWithoutMIC, err := phyPayload.MarshalBinary()
if err != nil {
return nil, err
}
// Build Challenge
challenge := &pb.ActivationChallengeRequest{
Payload: phyPayloadWithoutMIC,
AppId: deduplicatedActivationRequest.AppId,
DevId: deduplicatedActivationRequest.DevId,
AppEui: deduplicatedActivationRequest.AppEui,
DevEui: deduplicatedActivationRequest.DevEui,
}
// Send Challenge to all handlers and collect responses
var wg sync.WaitGroup
responses := make(chan *challengeResponseWithHandler, len(announcements))
for _, announcement := range announcements {
conn, err := b.getHandlerConn(announcement.Id)
if err != nil {
ctx.WithError(err).Warn("Could not dial handler for Activation")
continue
}
client := pb_handler.NewHandlerClient(conn)
// Do async request
wg.Add(1)
go func(announcement *pb_discovery.Announcement) {
res, err := client.ActivationChallenge(b.Component.GetContext(""), challenge)
if err == nil && res != nil {
responses <- &challengeResponseWithHandler{
handler: announcement,
client: client,
response: res,
}
}
wg.Done()
}(announcement)
}
// Make sure to close channel when all requests are done
go func() {
wg.Wait()
close(responses)
}()
var gotFirst bool
var joinHandler *pb_discovery.Announcement
var joinHandlerClient pb_handler.HandlerClient
for res := range responses {
var phyPayload lorawan.PHYPayload
err = phyPayload.UnmarshalBinary(res.response.Payload)
if err != nil {
continue
}
if phyPayload.MIC != correctMIC {
continue
}
if gotFirst {
ctx.Warn("Duplicate Activation Response")
} else {
gotFirst = true
joinHandler = res.handler
joinHandlerClient = res.client
}
}
// Activation not accepted by any broker
if !gotFirst {
ctx.Debug("Activation not accepted by any Handler")
return nil, errors.New("Activation not accepted by any Handler")
}
ctx.WithField("HandlerID", joinHandler.Id).Debug("Forward Activation")
handlerResponse, err := joinHandlerClient.Activate(b.Component.GetContext(""), deduplicatedActivationRequest)
if err != nil {
return nil, errors.Wrap(errors.FromGRPCError(err), "Handler refused activation")
}
handlerResponse, err = b.ns.Activate(b.Component.GetContext(b.nsToken), handlerResponse)
if err != nil {
return nil, errors.Wrap(errors.FromGRPCError(err), "NetworkServer refused activation")
}
res = &pb.DeviceActivationResponse{
Payload: handlerResponse.Payload,
Message: handlerResponse.Message,
DownlinkOption: handlerResponse.DownlinkOption,
}
return res, nil
}
func (n *networkServer) HandlePrepareActivation(activation *pb_broker.DeduplicatedDeviceActivationRequest) (*pb_broker.DeduplicatedDeviceActivationRequest, error) {
if activation.AppEui == nil || activation.DevEui == nil {
return nil, errors.NewErrInvalidArgument("Activation", "missing AppEUI or DevEUI")
}
dev, err := n.devices.Get(*activation.AppEui, *activation.DevEui)
if err != nil {
return nil, err
}
activation.AppId = dev.AppID
activation.DevId = dev.DevID
// Get activation constraints (for DevAddr prefix selection)
activationConstraints := strings.Split(dev.Options.ActivationConstraints, ",")
if len(activationConstraints) == 1 && activationConstraints[0] == "" {
activationConstraints = []string{}
}
activationConstraints = append(activationConstraints, "otaa")
// Build activation metadata if not present
if meta := activation.GetActivationMetadata(); meta == nil {
activation.ActivationMetadata = &pb_protocol.ActivationMetadata{}
}
// Build lorawan metadata if not present
if lorawan := activation.ActivationMetadata.GetLorawan(); lorawan == nil {
return nil, errors.NewErrInvalidArgument("Activation", "missing LoRaWAN metadata")
}
// Build response template if not present
if pld := activation.GetResponseTemplate(); pld == nil {
return nil, errors.NewErrInvalidArgument("Activation", "missing response template")
}
lorawanMeta := activation.ActivationMetadata.GetLorawan()
// Get a random device address
devAddr, err := n.getDevAddr(activationConstraints...)
if err != nil {
return nil, err
}
// Set the DevAddr in the Activation Metadata
lorawanMeta.DevAddr = &devAddr
// Build JoinAccept Payload
phy := lorawan.PHYPayload{
MHDR: lorawan.MHDR{
MType: lorawan.JoinAccept,
Major: lorawan.LoRaWANR1,
},
MACPayload: &lorawan.JoinAcceptPayload{
NetID: n.netID,
DLSettings: lorawan.DLSettings{RX2DataRate: uint8(lorawanMeta.Rx2Dr), RX1DROffset: uint8(lorawanMeta.Rx1DrOffset)},
RXDelay: uint8(lorawanMeta.RxDelay),
DevAddr: lorawan.DevAddr(devAddr),
},
}
if lorawanMeta.CfList != nil {
var cfList lorawan.CFList
for i, cfListItem := range lorawanMeta.CfList.Freq {
cfList[i] = cfListItem
}
phy.MACPayload.(*lorawan.JoinAcceptPayload).CFList = &cfList
}
// Set the Payload
phyBytes, err := phy.MarshalBinary()
if err != nil {
return nil, err
}
activation.ResponseTemplate.Payload = phyBytes
return activation, nil
}
func TestHandleUplink(t *testing.T) {
a := New(t)
b := getTestBroker(t)
gtwID := "eui-0102030405060708"
// Invalid Payload
err := b.HandleUplink(&pb.UplinkMessage{
Payload: []byte{0x01, 0x02, 0x03},
GatewayMetadata: &gateway.RxMetadata{Snr: 1.2, GatewayId: gtwID},
ProtocolMetadata: &protocol.RxMetadata{},
})
a.So(err, ShouldNotBeNil)
// Valid Payload
phy := lorawan.PHYPayload{
MHDR: lorawan.MHDR{
MType: lorawan.UnconfirmedDataUp,
Major: lorawan.LoRaWANR1,
},
MACPayload: &lorawan.MACPayload{
FHDR: lorawan.FHDR{
DevAddr: lorawan.DevAddr([4]byte{1, 2, 3, 4}),
FCnt: 1,
},
},
}
bytes, _ := phy.MarshalBinary()
// Device not found
b.uplinkDeduplicator = NewDeduplicator(10 * time.Millisecond)
b.ns.EXPECT().GetDevices(gomock.Any(), gomock.Any()).Return(&pb_networkserver.DevicesResponse{
Results: []*pb_lorawan.Device{},
}, nil)
err = b.HandleUplink(&pb.UplinkMessage{
Payload: bytes,
GatewayMetadata: &gateway.RxMetadata{Snr: 1.2, GatewayId: gtwID},
ProtocolMetadata: &protocol.RxMetadata{Protocol: &protocol.RxMetadata_Lorawan{Lorawan: &pb_lorawan.Metadata{}}},
})
a.So(err, ShouldHaveSameTypeAs, &errors.ErrNotFound{})
devEUI := types.DevEUI{1, 2, 3, 4, 5, 6, 7, 8}
wrongDevEUI := types.DevEUI{1, 2, 3, 4, 5, 6, 7, 9}
appEUI := types.AppEUI{1, 2, 3, 4, 5, 6, 7, 8}
appID := "appid-1"
nwkSKey := types.NwkSKey{1, 2, 3, 4, 5, 6, 7, 8, 1, 2, 3, 4, 5, 6, 7, 8}
// Add devices
b = getTestBroker(t)
nsResponse := &pb_networkserver.DevicesResponse{
Results: []*pb_lorawan.Device{
&pb_lorawan.Device{
DevEui: &wrongDevEUI,
AppEui: &appEUI,
AppId: appID,
NwkSKey: &nwkSKey,
FCntUp: 4,
},
&pb_lorawan.Device{
DevEui: &devEUI,
AppEui: &appEUI,
AppId: appID,
NwkSKey: &nwkSKey,
FCntUp: 3,
},
},
}
b.handlers["handlerID"] = &handler{uplink: make(chan *pb.DeduplicatedUplinkMessage, 10)}
// Device doesn't match
b.uplinkDeduplicator = NewDeduplicator(10 * time.Millisecond)
b.ns.EXPECT().GetDevices(gomock.Any(), gomock.Any()).Return(nsResponse, nil)
err = b.HandleUplink(&pb.UplinkMessage{
Payload: bytes,
GatewayMetadata: &gateway.RxMetadata{Snr: 1.2, GatewayId: gtwID},
ProtocolMetadata: &protocol.RxMetadata{Protocol: &protocol.RxMetadata_Lorawan{Lorawan: &pb_lorawan.Metadata{}}},
})
a.So(err, ShouldHaveSameTypeAs, &errors.ErrNotFound{})
phy.SetMIC(lorawan.AES128Key{1, 2, 3, 4, 5, 6, 7, 8, 1, 2, 3, 4, 5, 6, 7, 8})
bytes, _ = phy.MarshalBinary()
// Wrong FCnt
b.uplinkDeduplicator = NewDeduplicator(10 * time.Millisecond)
b.ns.EXPECT().GetDevices(gomock.Any(), gomock.Any()).Return(nsResponse, nil)
err = b.HandleUplink(&pb.UplinkMessage{
Payload: bytes,
GatewayMetadata: &gateway.RxMetadata{Snr: 1.2, GatewayId: gtwID},
ProtocolMetadata: &protocol.RxMetadata{Protocol: &protocol.RxMetadata_Lorawan{Lorawan: &pb_lorawan.Metadata{}}},
})
a.So(err, ShouldHaveSameTypeAs, &errors.ErrNotFound{})
// Disable FCnt Check
b.uplinkDeduplicator = NewDeduplicator(10 * time.Millisecond)
nsResponse.Results[0].DisableFCntCheck = true
b.ns.EXPECT().GetDevices(gomock.Any(), gomock.Any()).Return(nsResponse, nil)
b.ns.EXPECT().Uplink(gomock.Any(), gomock.Any())
b.discovery.EXPECT().GetAllHandlersForAppID("appid-1").Return([]*pb_discovery.Announcement{
&pb_discovery.Announcement{
Id: "handlerID",
},
}, nil)
err = b.HandleUplink(&pb.UplinkMessage{
Payload: bytes,
GatewayMetadata: &gateway.RxMetadata{Snr: 1.2, GatewayId: gtwID},
ProtocolMetadata: &protocol.RxMetadata{Protocol: &protocol.RxMetadata_Lorawan{Lorawan: &pb_lorawan.Metadata{}}},
})
a.So(err, ShouldBeNil)
// OK FCnt
b.uplinkDeduplicator = NewDeduplicator(10 * time.Millisecond)
nsResponse.Results[0].FCntUp = 0
nsResponse.Results[0].DisableFCntCheck = false
b.ns.EXPECT().GetDevices(gomock.Any(), gomock.Any()).Return(nsResponse, nil)
b.ns.EXPECT().Uplink(gomock.Any(), gomock.Any())
b.discovery.EXPECT().GetAllHandlersForAppID("appid-1").Return([]*pb_discovery.Announcement{
&pb_discovery.Announcement{
Id: "handlerID",
},
}, nil)
err = b.HandleUplink(&pb.UplinkMessage{
Payload: bytes,
GatewayMetadata: &gateway.RxMetadata{Snr: 1.2, GatewayId: gtwID},
ProtocolMetadata: &protocol.RxMetadata{Protocol: &protocol.RxMetadata_Lorawan{Lorawan: &pb_lorawan.Metadata{}}},
})
a.So(err, ShouldBeNil)
}
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
}