func msgFromPayload(payload []byte) (*pb_protocol.Message, error) {
var phy lorawan.PHYPayload
if err := phy.UnmarshalBinary(payload); err != nil {
return nil, err
}
msg := pb_lorawan.MessageFromPHYPayload(phy)
return &pb_protocol.Message{Protocol: &pb_protocol.Message_Lorawan{Lorawan: &msg}}, nil
}
// UnmarshalPayload unmarshals the Payload into Message if Message is nil
func (m *DeviceActivationResponse) UnmarshalPayload() error {
if m.GetMessage() == nil && m.GetDownlinkOption() != nil && m.DownlinkOption.GetProtocolConfig() != nil && m.DownlinkOption.ProtocolConfig.GetLorawan() != nil {
var phy lorawan.PHYPayload
if err := phy.UnmarshalBinary(m.Payload); err != nil {
return err
}
msg := pb_lorawan.MessageFromPHYPayload(phy)
m.Message = &pb_protocol.Message{Protocol: &pb_protocol.Message_Lorawan{Lorawan: &msg}}
}
return nil
}
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 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 TestHandlePrepareActivation(t *testing.T) {
a := New(t)
ns := &networkServer{
netID: [3]byte{0x00, 0x00, 0x13},
prefixes: map[types.DevAddrPrefix][]string{
types.DevAddrPrefix{DevAddr: [4]byte{0x26, 0x00, 0x00, 0x00}, Length: 7}: []string{
"otaa",
"local",
},
},
devices: device.NewRedisDeviceStore(GetRedisClient(), "test-handle-prepare-activation"),
}
appEUI := types.AppEUI(getEUI(2, 2, 3, 4, 5, 6, 7, 8))
devEUI := types.DevEUI(getEUI(2, 2, 3, 4, 5, 6, 7, 8))
// Device not registered
resp, err := ns.HandlePrepareActivation(&pb_broker.DeduplicatedDeviceActivationRequest{
ActivationMetadata: &pb_protocol.ActivationMetadata{Protocol: &pb_protocol.ActivationMetadata_Lorawan{
Lorawan: &pb_lorawan.ActivationMetadata{
CfList: &pb_lorawan.CFList{Freq: []uint32{867100000, 867300000, 867500000, 867700000, 867900000}},
},
}},
ResponseTemplate: &pb_broker.DeviceActivationResponse{},
})
a.So(err, ShouldNotBeNil)
dev := &device.Device{AppEUI: appEUI, DevEUI: devEUI, Options: device.Options{
ActivationConstraints: "private",
}}
a.So(ns.devices.Set(dev), ShouldBeNil)
defer func() {
ns.devices.Delete(appEUI, devEUI)
}()
// Constrained Device
resp, err = ns.HandlePrepareActivation(&pb_broker.DeduplicatedDeviceActivationRequest{
DevEui: &devEUI,
AppEui: &appEUI,
ActivationMetadata: &pb_protocol.ActivationMetadata{Protocol: &pb_protocol.ActivationMetadata_Lorawan{
Lorawan: &pb_lorawan.ActivationMetadata{
CfList: &pb_lorawan.CFList{Freq: []uint32{867100000, 867300000, 867500000, 867700000, 867900000}},
},
}},
ResponseTemplate: &pb_broker.DeviceActivationResponse{},
})
a.So(err, ShouldNotBeNil)
dev.StartUpdate()
dev.Options = device.Options{}
a.So(ns.devices.Set(dev), ShouldBeNil)
// Device registered
resp, err = ns.HandlePrepareActivation(&pb_broker.DeduplicatedDeviceActivationRequest{
DevEui: &devEUI,
AppEui: &appEUI,
ActivationMetadata: &pb_protocol.ActivationMetadata{Protocol: &pb_protocol.ActivationMetadata_Lorawan{
Lorawan: &pb_lorawan.ActivationMetadata{
CfList: &pb_lorawan.CFList{Freq: []uint32{867100000, 867300000, 867500000, 867700000, 867900000}},
},
}},
ResponseTemplate: &pb_broker.DeviceActivationResponse{},
})
a.So(err, ShouldBeNil)
devAddr := resp.ActivationMetadata.GetLorawan().DevAddr
a.So(devAddr.IsEmpty(), ShouldBeFalse)
a.So(devAddr[0]&254, ShouldEqual, 19<<1) // 7 MSB should be NetID
var resPHY lorawan.PHYPayload
resPHY.UnmarshalBinary(resp.ResponseTemplate.Payload)
resMAC, _ := resPHY.MACPayload.(*lorawan.DataPayload)
joinAccept := &lorawan.JoinAcceptPayload{}
joinAccept.UnmarshalBinary(false, resMAC.Bytes)
a.So(joinAccept.DevAddr[0]&254, ShouldEqual, 19<<1)
a.So(*joinAccept.CFList, ShouldEqual, lorawan.CFList{867100000, 867300000, 867500000, 867700000, 867900000})
}
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 (b *broker) HandleUplink(uplink *pb.UplinkMessage) (err error) {
ctx := b.Ctx.WithField("GatewayID", uplink.GatewayMetadata.GatewayId)
start := time.Now()
defer func() {
if err != nil {
ctx.WithError(err).Warn("Could not handle uplink")
} else {
ctx.WithField("Duration", time.Now().Sub(start)).Info("Handled uplink")
}
}()
time := time.Now()
b.status.uplink.Mark(1)
// De-duplicate uplink messages
duplicates := b.deduplicateUplink(uplink)
if len(duplicates) == 0 {
return nil
}
b.status.uplinkUnique.Mark(1)
ctx = ctx.WithField("Duplicates", len(duplicates))
base := duplicates[0]
if base.ProtocolMetadata.GetLorawan() == nil {
return errors.NewErrInvalidArgument("Uplink", "does not contain LoRaWAN metadata")
}
// LoRaWAN: Unmarshal
var phyPayload lorawan.PHYPayload
err = phyPayload.UnmarshalBinary(base.Payload)
if err != nil {
return err
}
macPayload, ok := phyPayload.MACPayload.(*lorawan.MACPayload)
if !ok {
return errors.NewErrInvalidArgument("Uplink", "does not contain a MAC payload")
}
// Request devices from NS
devAddr := types.DevAddr(macPayload.FHDR.DevAddr)
ctx = ctx.WithFields(log.Fields{
"DevAddr": devAddr,
"FCnt": macPayload.FHDR.FCnt,
})
var getDevicesResp *networkserver.DevicesResponse
getDevicesResp, err = b.ns.GetDevices(b.Component.GetContext(b.nsToken), &networkserver.DevicesRequest{
DevAddr: &devAddr,
FCnt: macPayload.FHDR.FCnt,
})
if err != nil {
return errors.Wrap(errors.FromGRPCError(err), "NetworkServer did not return devices")
}
b.status.deduplication.Update(int64(len(getDevicesResp.Results)))
if len(getDevicesResp.Results) == 0 {
return errors.NewErrNotFound(fmt.Sprintf("Device with DevAddr %s and FCnt <= %d", devAddr, macPayload.FHDR.FCnt))
}
ctx = ctx.WithField("DevAddrResults", len(getDevicesResp.Results))
// Sort by FCntUp to optimize the number of MIC checks
sort.Sort(ByFCntUp(getDevicesResp.Results))
// Find AppEUI/DevEUI through MIC check
var device *pb_lorawan.Device
var micChecks int
var originalFCnt uint32
for _, candidate := range getDevicesResp.Results {
nwkSKey := lorawan.AES128Key(*candidate.NwkSKey)
// First check with the 16 bit counter
micChecks++
ok, err = phyPayload.ValidateMIC(nwkSKey)
if err != nil {
return err
}
if ok {
device = candidate
break
}
originalFCnt = macPayload.FHDR.FCnt
if candidate.Uses32BitFCnt {
macPayload.FHDR.FCnt = fcnt.GetFull(candidate.FCntUp, uint16(originalFCnt))
// If 32 bit counter has different value, perform another MIC check
if macPayload.FHDR.FCnt != originalFCnt {
micChecks++
ok, err = phyPayload.ValidateMIC(nwkSKey)
if err != nil {
return err
}
if ok {
device = candidate
break
}
}
}
return errors.NewErrNotFound("device that validates MIC")
}
ctx = ctx.WithFields(log.Fields{
"MICChecks": micChecks,
"DevEUI": device.DevEui,
"AppEUI": device.AppEui,
"AppID": device.AppId,
"DevID": device.DevId,
"FCnt": originalFCnt,
})
if macPayload.FHDR.FCnt != originalFCnt {
ctx = ctx.WithField("RealFCnt", macPayload.FHDR.FCnt)
}
if device.DisableFCntCheck {
// TODO: Add warning to message?
} else if device.FCntUp == 0 {
} else if macPayload.FHDR.FCnt <= device.FCntUp || macPayload.FHDR.FCnt-device.FCntUp > maxFCntGap {
// Replay attack or FCnt gap too big
return errors.NewErrNotFound("device with matching FCnt")
}
// Add FCnt to Metadata (because it's not marshaled in lorawan payload)
base.ProtocolMetadata.GetLorawan().FCnt = macPayload.FHDR.FCnt
// Collect GatewayMetadata and DownlinkOptions
var gatewayMetadata []*gateway.RxMetadata
var downlinkOptions []*pb.DownlinkOption
var downlinkMessage *pb.DownlinkMessage
for _, duplicate := range duplicates {
gatewayMetadata = append(gatewayMetadata, duplicate.GatewayMetadata)
downlinkOptions = append(downlinkOptions, duplicate.DownlinkOptions...)
}
// Select best DownlinkOption
if len(downlinkOptions) > 0 {
downlinkMessage = &pb.DownlinkMessage{
DevEui: device.DevEui,
AppEui: device.AppEui,
AppId: device.AppId,
DevId: device.DevId,
DownlinkOption: selectBestDownlink(downlinkOptions),
}
}
// Build Uplink
deduplicatedUplink := &pb.DeduplicatedUplinkMessage{
Payload: base.Payload,
DevEui: device.DevEui,
DevId: device.DevId,
AppEui: device.AppEui,
AppId: device.AppId,
ProtocolMetadata: base.ProtocolMetadata,
GatewayMetadata: gatewayMetadata,
ServerTime: time.UnixNano(),
ResponseTemplate: downlinkMessage,
}
// Pass Uplink through NS
deduplicatedUplink, err = b.ns.Uplink(b.Component.GetContext(b.nsToken), deduplicatedUplink)
if err != nil {
return errors.Wrap(errors.FromGRPCError(err), "NetworkServer did not handle uplink")
}
var announcements []*pb_discovery.Announcement
announcements, err = b.Discovery.GetAllHandlersForAppID(device.AppId)
if err != nil {
return err
}
if len(announcements) == 0 {
return errors.NewErrNotFound(fmt.Sprintf("Handler for AppID %s", device.AppId))
}
if len(announcements) > 1 {
return errors.NewErrInternal(fmt.Sprintf("Multiple Handlers for AppID %s", device.AppId))
}
var handler chan<- *pb.DeduplicatedUplinkMessage
handler, err = b.getHandlerUplink(announcements[0].Id)
if err != nil {
return err
}
handler <- deduplicatedUplink
return nil
}
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
}
func (h *handler) ConvertFromLoRaWAN(ctx log.Interface, ttnUp *pb_broker.DeduplicatedUplinkMessage, appUp *types.UplinkMessage) error {
// Find Device
dev, err := h.devices.Get(ttnUp.AppId, ttnUp.DevId)
if err != nil {
return err
}
// Check for LoRaWAN
if lorawan := ttnUp.ProtocolMetadata.GetLorawan(); lorawan == nil {
return errors.NewErrInvalidArgument("Activation", "does not contain LoRaWAN metadata")
}
// LoRaWAN: Unmarshal Uplink
var phyPayload lorawan.PHYPayload
err = phyPayload.UnmarshalBinary(ttnUp.Payload)
if err != nil {
return err
}
macPayload, ok := phyPayload.MACPayload.(*lorawan.MACPayload)
if !ok {
return errors.NewErrInvalidArgument("Uplink", "does not contain a MAC payload")
}
macPayload.FHDR.FCnt = ttnUp.ProtocolMetadata.GetLorawan().FCnt
appUp.FCnt = macPayload.FHDR.FCnt
ctx = ctx.WithField("FCnt", appUp.FCnt)
// LoRaWAN: Validate MIC
ok, err = phyPayload.ValidateMIC(lorawan.AES128Key(dev.NwkSKey))
if err != nil {
return err
}
if !ok {
return errors.NewErrNotFound("device that validates MIC")
}
// LoRaWAN: Decrypt
if macPayload.FPort != nil && *macPayload.FPort != 0 && len(macPayload.FRMPayload) == 1 {
appUp.FPort = *macPayload.FPort
ctx = ctx.WithField("FCnt", appUp.FPort)
if err := phyPayload.DecryptFRMPayload(lorawan.AES128Key(dev.AppSKey)); err != nil {
return errors.NewErrInternal("Could not decrypt payload")
}
if len(macPayload.FRMPayload) == 1 {
payload, ok := macPayload.FRMPayload[0].(*lorawan.DataPayload)
if !ok {
return errors.NewErrInvalidArgument("Uplink FRMPayload", "must be of type *lorawan.DataPayload")
}
appUp.PayloadRaw = payload.Bytes
}
}
// LoRaWAN: Publish ACKs as events
if macPayload.FHDR.FCtrl.ACK {
h.mqttEvent <- &types.DeviceEvent{
AppID: appUp.AppID,
DevID: appUp.DevID,
Event: types.DownlinkAckEvent,
}
}
return nil
}
func (r *router) HandleUplink(gatewayID string, uplink *pb.UplinkMessage) (err error) {
ctx := r.Ctx.WithField("GatewayID", gatewayID)
start := time.Now()
defer func() {
if err != nil {
ctx.WithError(err).Warn("Could not handle uplink")
}
}()
r.status.uplink.Mark(1)
// LoRaWAN: Unmarshal
var phyPayload lorawan.PHYPayload
err = phyPayload.UnmarshalBinary(uplink.Payload)
if err != nil {
return err
}
if phyPayload.MHDR.MType == lorawan.JoinRequest {
joinRequestPayload, ok := phyPayload.MACPayload.(*lorawan.JoinRequestPayload)
if !ok {
return errors.NewErrInvalidArgument("Join Request", "does not contain a JoinRequest payload")
}
devEUI := types.DevEUI(joinRequestPayload.DevEUI)
appEUI := types.AppEUI(joinRequestPayload.AppEUI)
ctx.WithFields(log.Fields{
"DevEUI": devEUI,
"AppEUI": appEUI,
}).Debug("Handle Uplink as Activation")
r.HandleActivation(gatewayID, &pb.DeviceActivationRequest{
Payload: uplink.Payload,
DevEui: &devEUI,
AppEui: &appEUI,
ProtocolMetadata: uplink.ProtocolMetadata,
GatewayMetadata: uplink.GatewayMetadata,
})
return nil
}
if lorawan := uplink.ProtocolMetadata.GetLorawan(); lorawan != nil {
ctx = ctx.WithField("Modulation", lorawan.Modulation.String())
if lorawan.Modulation == pb_lorawan.Modulation_LORA {
ctx = ctx.WithField("DataRate", lorawan.DataRate)
} else {
ctx = ctx.WithField("BitRate", lorawan.BitRate)
}
}
if gateway := uplink.GatewayMetadata; gateway != nil {
ctx = ctx.WithFields(log.Fields{
"Frequency": gateway.Frequency,
"RSSI": gateway.Rssi,
"SNR": gateway.Snr,
})
}
macPayload, ok := phyPayload.MACPayload.(*lorawan.MACPayload)
if !ok {
return errors.NewErrInvalidArgument("Uplink", "does not contain a MAC payload")
}
devAddr := types.DevAddr(macPayload.FHDR.DevAddr)
ctx = ctx.WithFields(log.Fields{
"DevAddr": devAddr,
"FCnt": macPayload.FHDR.FCnt,
})
gateway := r.getGateway(gatewayID)
if err = gateway.HandleUplink(uplink); err != nil {
return err
}
var downlinkOptions []*pb_broker.DownlinkOption
if gateway.Schedule.IsActive() {
downlinkOptions = r.buildDownlinkOptions(uplink, false, gateway)
}
ctx = ctx.WithField("DownlinkOptions", len(downlinkOptions))
// Find Broker
brokers, err := r.Discovery.GetAllBrokersForDevAddr(devAddr)
if err != nil {
return err
}
if len(brokers) == 0 {
ctx.Debug("No brokers to forward message to")
return nil
}
ctx = ctx.WithField("NumBrokers", len(brokers))
// Forward to all brokers
for _, broker := range brokers {
broker, err := r.getBroker(broker)
if err != nil {
continue
}
broker.uplink <- &pb_broker.UplinkMessage{
Payload: uplink.Payload,
ProtocolMetadata: uplink.ProtocolMetadata,
GatewayMetadata: uplink.GatewayMetadata,
DownlinkOptions: downlinkOptions,
}
}
ctx.WithField("Duration", time.Now().Sub(start)).Info("Handled uplink")
return nil
}
