private static DownlinkMessage BuildDownstreamMessage(LoRaDevice loRaDevice,
StationEui stationEUI,
ILogger logger,
ulong xTime,
ReceiveWindow?rx1,
ReceiveWindow rx2,
RxDelay lnsRxDelay,
LoRaPayloadData loRaMessage,
LoRaDeviceClassType deviceClassType,
uint?antennaPreference = null)
{
var messageBytes = loRaMessage.Serialize(loRaDevice.AppSKey.Value, loRaDevice.NwkSKey.Value);
var downlinkMessage = new DownlinkMessage(
messageBytes,
xTime,
rx1, rx2,
loRaDevice.DevEUI,
lnsRxDelay,
deviceClassType,
stationEUI,
antennaPreference
);
if (logger.IsEnabled(LogLevel.Debug))
{
logger.LogDebug($"{loRaMessage.MessageType} {JsonConvert.SerializeObject(downlinkMessage)}");
}
return(downlinkMessage);
}
public async Task Validate_Limits(
uint payloadFcntUp,
uint?deviceFcntUp,
uint?deviceFcntDown,
uint?startFcntUp,
uint?startFcntDown,
uint expectedFcntUp,
uint expectedFcntDown,
bool abpRelaxed,
bool confirmed,
bool supports32Bit = false,
LoRaDeviceRequestFailedReason?failedReason = null)
{
var simulatedDevice = new SimulatedDevice(TestDeviceInfo.CreateABPDevice(1, gatewayID: ServerConfiguration.GatewayID, supports32BitFcnt: supports32Bit));
var devEui = simulatedDevice.LoRaDevice.DevEui;
var devAddr = simulatedDevice.LoRaDevice.DevAddr.Value;
LoRaDeviceClient.Setup(x => x.SendEventAsync(It.IsNotNull <LoRaDeviceTelemetry>(), null)).ReturnsAsync(true);
var initialTwin = SetupTwins(deviceFcntUp, deviceFcntDown, startFcntUp, startFcntDown, abpRelaxed, supports32Bit, simulatedDevice, devEui, devAddr);
LoRaDeviceClient
.Setup(x => x.GetTwinAsync(CancellationToken.None)).Returns(() =>
{
return(Task.FromResult(initialTwin));
});
uint?fcntUpSavedInTwin = null;
uint?fcntDownSavedInTwin = null;
LoRaDeviceClient.Setup(x => x.UpdateReportedPropertiesAsync(It.IsNotNull <TwinCollection>(), It.IsAny <CancellationToken>()))
.Returns <TwinCollection, CancellationToken>((t, _) =>
{
fcntUpSavedInTwin = (uint)t[TwinProperty.FCntUp];
fcntDownSavedInTwin = (uint)t[TwinProperty.FCntDown];
return(Task.FromResult(true));
});
LoRaDeviceClient
.Setup(x => x.ReceiveAsync(It.IsAny <TimeSpan>()))
.ReturnsAsync((Message)null);
var shouldReset = payloadFcntUp == 0 && abpRelaxed;
if (shouldReset)
{
LoRaDeviceApi.Setup(x => x.ABPFcntCacheResetAsync(devEui, It.IsAny <uint>(), It.IsNotNull <string>())).ReturnsAsync(true);
}
LoRaDeviceApi.Setup(x => x.SearchByDevAddrAsync(devAddr))
.ReturnsAsync(new SearchDevicesResult(new IoTHubDeviceInfo(devAddr, devEui, "abc").AsList()));
using var memoryCache = new MemoryCache(new MemoryCacheOptions());
using var deviceRegistry = new LoRaDeviceRegistry(ServerConfiguration, memoryCache, LoRaDeviceApi.Object, LoRaDeviceFactory, DeviceCache);
// Send to message processor
using var messageDispatcher = new MessageDispatcher(
ServerConfiguration,
deviceRegistry,
FrameCounterUpdateStrategyProvider);
var loRaPayloadData = confirmed
? simulatedDevice.CreateConfirmedDataUpMessage("1234", fcnt: payloadFcntUp, appSKey: simulatedDevice.AppSKey, nwkSKey: simulatedDevice.NwkSKey)
: simulatedDevice.CreateUnconfirmedDataUpMessage("1234", fcnt: payloadFcntUp);
using var req = CreateWaitableRequest(TestUtils.GenerateTestRadioMetadata(), loRaPayloadData);
messageDispatcher.DispatchRequest(req);
Assert.True(await req.WaitCompleteAsync(-1));
if (failedReason.HasValue)
{
Assert.Equal(failedReason.Value, req.ProcessingFailedReason);
}
else
{
Assert.True(req.ProcessingSucceeded);
Assert.True(DeviceCache.TryGetByDevEui(devEui, out var loRaDevice));
if (confirmed)
{
Assert.NotNull(req.ResponseDownlink);
Assert.True(req.ProcessingSucceeded);
Assert.Single(DownstreamMessageSender.DownlinkMessages);
var downlinkMessage = DownstreamMessageSender.DownlinkMessages[0];
var payloadDataDown = new LoRaPayloadData(downlinkMessage.Data);
payloadDataDown.Serialize(simulatedDevice.AppSKey.Value);
Assert.Equal(expectedFcntDown, payloadDataDown.Fcnt);
}
Assert.Equal(expectedFcntUp, loRaDevice.FCntUp);
}
}
/// <summary>
/// Creates downlink message with ack for confirmation or cloud to device message
/// </summary>
internal static DownlinkMessageBuilderResponse CreateDownlinkMessage(
NetworkServerConfiguration configuration,
LoRaDevice loRaDevice,
LoRaRequest request,
LoRaOperationTimeWatcher timeWatcher,
IReceivedLoRaCloudToDeviceMessage cloudToDeviceMessage,
bool fpending,
uint fcntDown,
LoRaADRResult loRaADRResult)
{
var fcntDownToSend = ValidateAndConvert16bitFCnt(fcntDown);
var upstreamPayload = (LoRaPayloadData)request.Payload;
var rxpk = request.Rxpk;
var loRaRegion = request.Region;
bool isMessageTooLong = false;
// default fport
byte fctrl = 0;
if (upstreamPayload.LoRaMessageType == LoRaMessageType.ConfirmedDataUp)
{
// Confirm receiving message to device
fctrl = (byte)FctrlEnum.Ack;
}
// Calculate receive window
var receiveWindow = timeWatcher.ResolveReceiveWindowToUse(loRaDevice);
if (receiveWindow == Constants.INVALID_RECEIVE_WINDOW)
{
// No valid receive window. Abandon the message
isMessageTooLong = true;
return(new DownlinkMessageBuilderResponse(null, isMessageTooLong));
}
byte[] rndToken = new byte[2];
lock (RndLock)
{
RndDownlinkMessageBuilder.NextBytes(rndToken);
}
string datr;
double freq;
long tmst;
if (receiveWindow == Constants.RECEIVE_WINDOW_2)
{
tmst = rxpk.Tmst + CalculateTime(timeWatcher.GetReceiveWindow2Delay(loRaDevice), loRaDevice.ReportedRXDelay);
(freq, datr) = loRaRegion.GetDownstreamRX2DRAndFreq(loRaDevice.DevEUI, configuration.Rx2DataRate, configuration.Rx2DataFrequency, loRaDevice.ReportedRX2DataRate);
}
else
{
datr = loRaRegion.GetDownstreamDR(rxpk, (uint)loRaDevice.ReportedRX1DROffset);
if (datr == null)
{
Logger.Log(loRaDevice.DevEUI, "there was a problem in setting the data rate in the downstream message packet forwarder settings", LogLevel.Error);
return(new DownlinkMessageBuilderResponse(null, false));
}
if (!loRaRegion.TryGetUpstreamChannelFrequency(rxpk, out freq))
{
Logger.Log(loRaDevice.DevEUI, "there was a problem in setting the frequency in the downstream message packet forwarder settings", LogLevel.Error);
return(new DownlinkMessageBuilderResponse(null, false));
}
tmst = rxpk.Tmst + CalculateTime(timeWatcher.GetReceiveWindow1Delay(loRaDevice), loRaDevice.ReportedRXDelay);
}
// get max. payload size based on data rate from LoRaRegion
var maxPayloadSize = loRaRegion.GetMaxPayloadSize(datr);
// Deduct 8 bytes from max payload size.
maxPayloadSize -= Constants.LORA_PROTOCOL_OVERHEAD_SIZE;
var availablePayloadSize = maxPayloadSize;
var macCommands = new List <MacCommand>();
byte?fport = null;
var requiresDeviceAcknowlegement = false;
var macCommandType = CidEnum.Zero;
byte[] frmPayload = null;
if (cloudToDeviceMessage != null)
{
// Get C2D Mac coomands
var macCommandsC2d = PrepareMacCommandAnswer(loRaDevice.DevEUI, null, cloudToDeviceMessage?.MacCommands, rxpk, null);
// Calculate total C2D payload size
var totalC2dSize = cloudToDeviceMessage.GetPayload()?.Length ?? 0;
totalC2dSize += macCommandsC2d?.Sum(x => x.Length) ?? 0;
// Total C2D payload will fit
if (availablePayloadSize >= totalC2dSize)
{
// Add frmPayload
frmPayload = cloudToDeviceMessage.GetPayload();
// Add C2D Mac commands
if (macCommandsC2d?.Count > 0)
{
foreach (MacCommand macCommand in macCommandsC2d)
{
macCommands.Add(macCommand);
}
}
// Deduct frmPayload size from available payload size, continue processing and log
availablePayloadSize -= (uint)totalC2dSize;
if (cloudToDeviceMessage.Confirmed)
{
requiresDeviceAcknowlegement = true;
loRaDevice.LastConfirmedC2DMessageID = cloudToDeviceMessage.MessageId ?? Constants.C2D_MSG_ID_PLACEHOLDER;
}
if (cloudToDeviceMessage.Fport > 0)
{
fport = cloudToDeviceMessage.Fport;
}
Logger.Log(loRaDevice.DevEUI, $"cloud to device message: {((frmPayload?.Length ?? 0) == 0 ? "empty" : ConversionHelper.ByteArrayToString(frmPayload))}, id: {cloudToDeviceMessage.MessageId ?? "undefined"}, fport: {fport ?? 0}, confirmed: {requiresDeviceAcknowlegement}, cidType: {macCommandType}, macCommand: {macCommands.Count > 0}", LogLevel.Information);
Array.Reverse(frmPayload);
}
else
{
// Flag message to be abandoned and log
Logger.Log(loRaDevice.DevEUI, $"cloud to device message: {((frmPayload?.Length ?? 0) == 0 ? "empty" : Encoding.UTF8.GetString(frmPayload))}, id: {cloudToDeviceMessage.MessageId ?? "undefined"}, fport: {fport ?? 0}, confirmed: {requiresDeviceAcknowlegement} too long for current receive window. Abandoning.", LogLevel.Debug);
isMessageTooLong = true;
}
}
// Get request Mac commands
var macCommandsRequest = PrepareMacCommandAnswer(loRaDevice.DevEUI, upstreamPayload.MacCommands, null, rxpk, loRaADRResult);
// Calculate request Mac commands size
var macCommandsRequestSize = macCommandsRequest?.Sum(x => x.Length) ?? 0;
// Try adding request Mac commands
if (availablePayloadSize >= macCommandsRequestSize)
{
if (macCommandsRequest?.Count > 0)
{
foreach (MacCommand macCommand in macCommandsRequest)
{
macCommands.Add(macCommand);
}
}
}
if (fpending || isMessageTooLong)
{
fctrl |= (int)FctrlEnum.FpendingOrClassB;
}
if (upstreamPayload.IsAdrEnabled)
{
fctrl |= (byte)FctrlEnum.ADR;
}
var srcDevAddr = upstreamPayload.DevAddr.Span;
var reversedDevAddr = new byte[srcDevAddr.Length];
for (int i = reversedDevAddr.Length - 1; i >= 0; --i)
{
reversedDevAddr[i] = srcDevAddr[srcDevAddr.Length - (1 + i)];
}
var msgType = requiresDeviceAcknowlegement ? LoRaMessageType.ConfirmedDataDown : LoRaMessageType.UnconfirmedDataDown;
var ackLoRaMessage = new LoRaPayloadData(
msgType,
reversedDevAddr,
new byte[] { fctrl },
BitConverter.GetBytes(fcntDownToSend),
macCommands,
fport.HasValue ? new byte[] { fport.Value } : null,
frmPayload,
1,
loRaDevice.Supports32BitFCnt ? fcntDown : (uint?)null);
// todo: check the device twin preference if using confirmed or unconfirmed down
Logger.Log(loRaDevice.DevEUI, $"sending a downstream message with ID {ConversionHelper.ByteArrayToString(rndToken)}", LogLevel.Information);
return(new DownlinkMessageBuilderResponse(
ackLoRaMessage.Serialize(loRaDevice.AppSKey, loRaDevice.NwkSKey, datr, freq, tmst, loRaDevice.DevEUI),
isMessageTooLong));
}
internal static DownlinkMessageBuilderResponse CreateDownlinkMessage(
NetworkServerConfiguration configuration,
LoRaDevice loRaDevice,
Region loRaRegion,
IReceivedLoRaCloudToDeviceMessage cloudToDeviceMessage,
uint fcntDown)
{
var fcntDownToSend = ValidateAndConvert16bitFCnt(fcntDown);
// default fport
byte fctrl = 0;
CidEnum macCommandType = CidEnum.Zero;
byte[] rndToken = new byte[2];
lock (RndLock)
{
RndDownlinkMessageBuilder.NextBytes(rndToken);
}
bool isMessageTooLong = false;
// Class C always uses RX2
string datr;
double freq;
var tmst = 0; // immediate mode
// Class C always use RX2
(freq, datr) = loRaRegion.GetDownstreamRX2DRAndFreq(loRaDevice.DevEUI, configuration.Rx2DataRate, configuration.Rx2DataFrequency, loRaDevice.ReportedRX2DataRate);
// get max. payload size based on data rate from LoRaRegion
var maxPayloadSize = loRaRegion.GetMaxPayloadSize(datr);
// Deduct 8 bytes from max payload size.
maxPayloadSize -= Constants.LORA_PROTOCOL_OVERHEAD_SIZE;
var availablePayloadSize = maxPayloadSize;
var macCommands = PrepareMacCommandAnswer(loRaDevice.DevEUI, null, cloudToDeviceMessage.MacCommands, null, null);
// Calculate total C2D payload size
var totalC2dSize = cloudToDeviceMessage.GetPayload()?.Length ?? 0;
totalC2dSize += macCommands?.Sum(x => x.Length) ?? 0;
// Total C2D payload will NOT fit
if (availablePayloadSize < totalC2dSize)
{
isMessageTooLong = true;
return(new DownlinkMessageBuilderResponse(null, isMessageTooLong));
}
if (macCommands?.Count > 0)
{
macCommandType = macCommands.First().Cid;
}
if (cloudToDeviceMessage.Confirmed)
{
loRaDevice.LastConfirmedC2DMessageID = cloudToDeviceMessage.MessageId ?? Constants.C2D_MSG_ID_PLACEHOLDER;
}
var frmPayload = cloudToDeviceMessage.GetPayload();
if (Logger.LoggerLevel >= LogLevel.Information)
{
Logger.Log(loRaDevice.DevEUI, $"cloud to device message: {ConversionHelper.ByteArrayToString(frmPayload)}, id: {cloudToDeviceMessage.MessageId ?? "undefined"}, fport: {cloudToDeviceMessage.Fport}, confirmed: {cloudToDeviceMessage.Confirmed}, cidType: {macCommandType}", LogLevel.Information);
Logger.Log(loRaDevice.DevEUI, $"sending a downstream message with ID {ConversionHelper.ByteArrayToString(rndToken)}", LogLevel.Information);
}
Array.Reverse(frmPayload);
var payloadDevAddr = ConversionHelper.StringToByteArray(loRaDevice.DevAddr);
var reversedDevAddr = new byte[payloadDevAddr.Length];
for (int i = reversedDevAddr.Length - 1; i >= 0; --i)
{
reversedDevAddr[i] = payloadDevAddr[payloadDevAddr.Length - (1 + i)];
}
var msgType = cloudToDeviceMessage.Confirmed ? LoRaMessageType.ConfirmedDataDown : LoRaMessageType.UnconfirmedDataDown;
var ackLoRaMessage = new LoRaPayloadData(
msgType,
reversedDevAddr,
new byte[] { fctrl },
BitConverter.GetBytes(fcntDownToSend),
macCommands,
new byte[] { cloudToDeviceMessage.Fport },
frmPayload,
1,
loRaDevice.Supports32BitFCnt ? fcntDown : (uint?)null);
return(new DownlinkMessageBuilderResponse(
ackLoRaMessage.Serialize(loRaDevice.AppSKey, loRaDevice.NwkSKey, datr, freq, tmst, loRaDevice.DevEUI),
isMessageTooLong));
}
public async Task Unconfirmed_Cloud_To_Device_From_Decoder_Should_Send_Downstream_Message(string c2dDevEUI)
{
const uint PayloadFcnt = 10;
const uint InitialDeviceFcntUp = 9;
const uint InitialDeviceFcntDown = 20;
var simulatedDevice = new SimulatedDevice(
TestDeviceInfo.CreateABPDevice(1, gatewayID: ServerConfiguration.GatewayID),
frmCntUp: InitialDeviceFcntUp,
frmCntDown: InitialDeviceFcntDown);
var loraDevice = CreateLoRaDevice(simulatedDevice);
LoRaDeviceClient.Setup(x => x.SendEventAsync(It.IsNotNull <LoRaDeviceTelemetry>(), null))
.ReturnsAsync(true);
var decoderResult = new DecodePayloadResult("1")
{
CloudToDeviceMessage = new ReceivedLoRaCloudToDeviceMessage()
{
Fport = TestPort,
MessageId = "123",
Payload = "12",
DevEUI = c2dDevEUI is { } someDevEui?DevEui.Parse(someDevEui) : null
},
};
var payloadDecoder = new Mock <ILoRaPayloadDecoder>(MockBehavior.Strict);
payloadDecoder.Setup(x => x.DecodeMessageAsync(simulatedDevice.DevEUI, It.IsNotNull <byte[]>(), TestPort, It.IsAny <string>()))
.ReturnsAsync(decoderResult);
PayloadDecoder.SetDecoder(payloadDecoder.Object);
using var cache = EmptyMemoryCache();
using var loraDeviceCache = CreateDeviceCache(loraDevice);
using var deviceRegistry = new LoRaDeviceRegistry(ServerConfiguration, cache, LoRaDeviceApi.Object, LoRaDeviceFactory, loraDeviceCache);
// Send to message processor
using var messageProcessor = new MessageDispatcher(
ServerConfiguration,
deviceRegistry,
FrameCounterUpdateStrategyProvider);
var payload = simulatedDevice.CreateUnconfirmedDataUpMessage("1234", fcnt: PayloadFcnt);
using var request = CreateWaitableRequest(payload);
messageProcessor.DispatchRequest(request);
Assert.True(await request.WaitCompleteAsync());
// Expectations
// 1. Message was sent to IoT Hub
LoRaDeviceClient.VerifyAll();
LoRaDeviceApi.VerifyAll();
// 2. Return is downstream message
Assert.NotNull(request.ResponseDownlink);
Assert.True(request.ProcessingSucceeded);
Assert.Single(DownstreamMessageSender.DownlinkMessages);
var downlinkMessage = DownstreamMessageSender.DownlinkMessages[0];
var payloadDataDown = new LoRaPayloadData(downlinkMessage.Data);
payloadDataDown.Serialize(loraDevice.AppSKey.Value);
Assert.Equal(payloadDataDown.DevAddr, loraDevice.DevAddr);
Assert.False(payloadDataDown.IsConfirmed);
Assert.Equal(MacMessageType.UnconfirmedDataDown, payloadDataDown.MessageType);
// 4. Frame counter up was updated
Assert.Equal(PayloadFcnt, loraDevice.FCntUp);
// 5. Frame counter down is updated
Assert.Equal(InitialDeviceFcntDown + 1, loraDevice.FCntDown);
Assert.Equal(InitialDeviceFcntDown + 1, payloadDataDown.Fcnt);
// 6. Frame count has pending changes
Assert.True(loraDevice.HasFrameCountChanges);
LoRaDeviceApi.VerifyAll();
LoRaDeviceClient.VerifyAll();
payloadDecoder.VerifyAll();
}
public async Task When_Device_Prefers_Second_Window_Should_Send_Downstream_In_Second_Window()
{
const uint PayloadFcnt = 10;
const uint InitialDeviceFcntUp = 9;
const uint InitialDeviceFcntDown = 20;
var simulatedDevice = new SimulatedDevice(
TestDeviceInfo.CreateABPDevice(1, gatewayID: ServerConfiguration.GatewayID),
frmCntUp: InitialDeviceFcntUp,
frmCntDown: InitialDeviceFcntDown);
var devAddr = simulatedDevice.DevAddr.Value;
var devEUI = simulatedDevice.DevEUI;
// Will get twin to initialize LoRaDevice
var deviceTwin = TestUtils.CreateABPTwin(
simulatedDevice,
desiredProperties: new Dictionary <string, object>
{
{ TwinProperty.PreferredWindow, 2 }
});
LoRaDeviceClient.Setup(x => x.GetTwinAsync(CancellationToken.None)).ReturnsAsync(deviceTwin);
LoRaDeviceClient.Setup(x => x.UpdateReportedPropertiesAsync(It.IsNotNull <TwinCollection>(), It.IsAny <CancellationToken>()))
.ReturnsAsync(true);
LoRaDeviceClient.Setup(x => x.SendEventAsync(It.IsNotNull <LoRaDeviceTelemetry>(), null))
.ReturnsAsync(true);
using var cloudToDeviceMessage = new ReceivedLoRaCloudToDeviceMessage()
{
Payload = "c2d", Fport = TestPort
}
.CreateMessage();
LoRaDeviceClient.SetupSequence(x => x.ReceiveAsync(It.IsAny <TimeSpan>()))
.ReturnsAsync(cloudToDeviceMessage)
.Returns(EmptyAdditionalMessageReceiveAsync); // 2nd cloud to device message does not return anything
LoRaDeviceClient.Setup(x => x.CompleteAsync(cloudToDeviceMessage))
.ReturnsAsync(true);
LoRaDeviceApi.Setup(x => x.SearchByDevAddrAsync(devAddr))
.ReturnsAsync(new SearchDevicesResult(new IoTHubDeviceInfo(devAddr, devEUI, "adad").AsList()));
using var cache = NewMemoryCache();
using var loRaDeviceRegistry = new LoRaDeviceRegistry(ServerConfiguration, cache, LoRaDeviceApi.Object, LoRaDeviceFactory, DeviceCache);
// Send to message processor
using var messageProcessor = new MessageDispatcher(
ServerConfiguration,
loRaDeviceRegistry,
FrameCounterUpdateStrategyProvider);
var payload = simulatedDevice.CreateUnconfirmedDataUpMessage("1234", fcnt: PayloadFcnt);
using var request = CreateWaitableRequest(payload);
messageProcessor.DispatchRequest(request);
Assert.True(await request.WaitCompleteAsync());
// Expectations
// 1. Message was sent to IoT Hub
LoRaDeviceClient.VerifyAll();
LoRaDeviceApi.VerifyAll();
// 3. Return is downstream message
Assert.True(request.ProcessingSucceeded);
Assert.NotNull(request.ResponseDownlink);
Assert.Single(DownstreamMessageSender.DownlinkMessages);
var downlinkMessage = DownstreamMessageSender.DownlinkMessages.First();
TestUtils.CheckDRAndFrequencies(request, downlinkMessage, true);
// Get the device from cache
Assert.True(DeviceCache.TryGetForPayload(request.Payload, out var loRaDevice));
var payloadDataDown = new LoRaPayloadData(downlinkMessage.Data);
payloadDataDown.Serialize(loRaDevice.AppSKey.Value);
Assert.Equal(payloadDataDown.DevAddr, loRaDevice.DevAddr);
Assert.False(payloadDataDown.IsConfirmed);
Assert.Equal(MacMessageType.UnconfirmedDataDown, payloadDataDown.MessageType);
// 4. Frame counter up was updated
Assert.Equal(PayloadFcnt, loRaDevice.FCntUp);
// 5. Frame counter down is updated
var expectedFcntDown = InitialDeviceFcntDown + Constants.MaxFcntUnsavedDelta - 1 + 1; // adding 9 as buffer when creating a new device instance
Assert.Equal(expectedFcntDown, loRaDevice.FCntDown);
Assert.Equal(expectedFcntDown, payloadDataDown.Fcnt);
Assert.Equal(0U, loRaDevice.FCntDown - loRaDevice.LastSavedFCntDown);
// 6. Frame count has no pending changes
Assert.False(loRaDevice.HasFrameCountChanges);
}
public async Task OTAA_Unconfirmed_With_Cloud_To_Device_Mac_Command_Returns_Downstream_Message(string msg)
{
const uint PayloadFcnt = 20;
const uint InitialDeviceFcntUp = 9;
const uint InitialDeviceFcntDown = 20;
var simulatedDevice = new SimulatedDevice(
TestDeviceInfo.CreateABPDevice(1, gatewayID: ServerConfiguration.GatewayID),
frmCntUp: InitialDeviceFcntUp,
frmCntDown: InitialDeviceFcntDown);
var loraDevice = CreateLoRaDevice(simulatedDevice);
LoRaDeviceClient.Setup(x => x.SendEventAsync(It.IsNotNull <LoRaDeviceTelemetry>(), null))
.ReturnsAsync(true);
LoRaDeviceClient.Setup(x => x.UpdateReportedPropertiesAsync(It.IsNotNull <TwinCollection>(), It.IsAny <CancellationToken>()))
.ReturnsAsync(true);
var c2d = new ReceivedLoRaCloudToDeviceMessage()
{
Payload = msg,
MacCommands = { new DevStatusRequest() },
};
if (!string.IsNullOrEmpty(msg))
{
c2d.Fport = TestPort;
}
using var cloudToDeviceMessage = c2d.CreateMessage();
LoRaDeviceClient.SetupSequence(x => x.ReceiveAsync(It.IsAny <TimeSpan>()))
.ReturnsAsync(cloudToDeviceMessage)
.ReturnsAsync((Message)null); // 2nd cloud to device message does not return anything
LoRaDeviceClient.Setup(x => x.CompleteAsync(cloudToDeviceMessage))
.ReturnsAsync(true);
using var cache = EmptyMemoryCache();
using var loraDeviceCache = CreateDeviceCache(loraDevice);
using var deviceRegistry = new LoRaDeviceRegistry(ServerConfiguration, cache, LoRaDeviceApi.Object, LoRaDeviceFactory, loraDeviceCache);
// Send to message processor
using var messageProcessor = new MessageDispatcher(
ServerConfiguration,
deviceRegistry,
FrameCounterUpdateStrategyProvider);
var payload = simulatedDevice.CreateUnconfirmedDataUpMessage("1234", fcnt: PayloadFcnt);
using var request = CreateWaitableRequest(payload);
messageProcessor.DispatchRequest(request);
Assert.True(await request.WaitCompleteAsync());
// Expectations
// 1. Message was sent to IoT Hub
LoRaDeviceClient.VerifyAll();
LoRaDeviceApi.VerifyAll();
// 2. Return is downstream message
Assert.NotNull(request.ResponseDownlink);
Assert.True(request.ProcessingSucceeded);
Assert.Single(DownstreamMessageSender.DownlinkMessages);
var downlinkMessage = DownstreamMessageSender.DownlinkMessages[0];
var payloadDataDown = new LoRaPayloadData(downlinkMessage.Data);
// in case no payload the mac is in the FRMPayload and is decrypted with NwkSKey
if (string.IsNullOrEmpty(msg))
{
payloadDataDown.Serialize(loraDevice.NwkSKey.Value);
}
else
{
payloadDataDown.Serialize(loraDevice.AppSKey.Value);
}
Assert.Equal(payloadDataDown.DevAddr, loraDevice.DevAddr);
Assert.False(payloadDataDown.IsConfirmed);
Assert.Equal(MacMessageType.UnconfirmedDataDown, payloadDataDown.MessageType);
// 4. Frame counter up was updated
Assert.Equal(PayloadFcnt, loraDevice.FCntUp);
// 5. Frame counter down is updated
Assert.Equal(InitialDeviceFcntDown + 1, loraDevice.FCntDown);
Assert.Equal(InitialDeviceFcntDown + 1, payloadDataDown.Fcnt);
// 6. Frame count has no pending changes
Assert.False(loraDevice.HasFrameCountChanges);
// 7. Mac commands should be present in reply
// mac command is in fopts if there is a c2d message
if (string.IsNullOrEmpty(msg))
{
Assert.Equal(FramePort.MacCommand, payloadDataDown.Fport);
Assert.NotNull(payloadDataDown.Frmpayload.Span.ToArray());
Assert.Single(payloadDataDown.Frmpayload.Span.ToArray());
Assert.Equal((byte)LoRaTools.Cid.DevStatusCmd, payloadDataDown.Frmpayload.Span[0]);
}
else
{
Assert.NotNull(payloadDataDown.Fopts.Span.ToArray());
Assert.Single(payloadDataDown.Fopts.Span.ToArray());
Assert.Equal((byte)LoRaTools.Cid.DevStatusCmd, payloadDataDown.Fopts.Span[0]);
}
LoRaDeviceClient.VerifyAll();
LoRaDeviceApi.VerifyAll();
}
public async Task Perform_NbRep_Adaptation_When_Needed()
{
uint deviceId = 31;
var currentDR = LoRaDataRate.SF8BW125;
var currentLsnr = -20;
var messageCount = 20;
uint payloadFcnt = 0;
const uint InitialDeviceFcntUp = 1;
const uint ExpectedDeviceFcntDown = 4;
var simulatedDevice = new SimulatedDevice(
TestDeviceInfo.CreateABPDevice(deviceId, gatewayID: ServerConfiguration.GatewayID),
frmCntUp: InitialDeviceFcntUp);
var loraDevice = CreateLoRaDevice(simulatedDevice);
LoRaDeviceClient.Setup(x => x.SendEventAsync(It.IsNotNull <LoRaDeviceTelemetry>(), null))
.ReturnsAsync(true);
LoRaDeviceClient.Setup(x => x.ReceiveAsync(It.IsNotNull <TimeSpan>()))
.ReturnsAsync((Message)null);
var reportedNbRep = 0;
LoRaDeviceClient.Setup(x => x.UpdateReportedPropertiesAsync(It.IsNotNull <TwinCollection>(), It.IsAny <CancellationToken>()))
.Callback <TwinCollection, CancellationToken>((t, _) =>
{
if (t.Contains(TwinProperty.NbRep))
{
reportedNbRep = (int)t[TwinProperty.NbRep];
}
})
.ReturnsAsync(true);
using var cache = EmptyMemoryCache();
using var loraDeviceCache = CreateDeviceCache(loraDevice);
using var deviceRegistry = new LoRaDeviceRegistry(ServerConfiguration, cache, LoRaDeviceApi.Object, LoRaDeviceFactory, loraDeviceCache);
// Send to message processor
using var messageProcessor = new MessageDispatcher(
ServerConfiguration,
deviceRegistry,
FrameCounterUpdateStrategyProvider);
payloadFcnt = await InitializeCacheToDefaultValuesAsync(payloadFcnt, simulatedDevice, messageProcessor);
// ****************************************************
// First part send messages with spaces in fcnt to simulate wrong network connectivity
// ****************************************************
// send a message with a fcnt every 4.
for (var i = 0; i < messageCount; i++)
{
payloadFcnt = await SendMessage(currentLsnr, currentDR, payloadFcnt + 3, simulatedDevice, messageProcessor, FrameControlFlags.Adr);
}
var payload = simulatedDevice.CreateUnconfirmedDataUpMessage("1234", fcnt: payloadFcnt, fctrlFlags: FrameControlFlags.AdrAckReq | FrameControlFlags.Adr);
var radioMetadata = new RadioMetadata(TestUtils.TestRegion.GetDataRateIndex(currentDR), Hertz.Mega(868.1), new RadioMetadataUpInfo(0, 0, 0, 0, currentLsnr));
using var request = CreateWaitableRequest(radioMetadata, payload);
messageProcessor.DispatchRequest(request);
Assert.True(await request.WaitCompleteAsync());
// Expectations
// 1. Message was sent to IoT Hub
LoRaDeviceClient.VerifyAll();
LoRaDeviceApi.VerifyAll();
Assert.True(request.ProcessingSucceeded);
Assert.NotNull(request.ResponseDownlink);
Assert.Equal(2, DownstreamMessageSender.DownlinkMessages.Count);
var downlinkMessage = DownstreamMessageSender.DownlinkMessages[1];
var payloadDataDown = new LoRaPayloadData(downlinkMessage.Data);
// We expect a mac command in the payload
Assert.Equal(5, payloadDataDown.Frmpayload.Span.Length);
var decryptedPayload = payloadDataDown.Serialize(simulatedDevice.NwkSKey.Value);
Assert.Equal(FramePort.MacCommand, payloadDataDown.Fport);
Assert.Equal((byte)Cid.LinkADRCmd, decryptedPayload[0]);
var linkAdr = new LinkADRRequest(decryptedPayload);
Assert.Equal(3, reportedNbRep);
Assert.Equal(3, linkAdr.NbRep);
Assert.Equal(3, loraDevice.NbRep);
// ****************************************************
// Second part send normal messages to decrease NbRep
// ****************************************************
// send a message with a fcnt every 1
for (var i = 0; i < messageCount; i++)
{
payloadFcnt = await SendMessage(currentLsnr, currentDR, payloadFcnt, simulatedDevice, messageProcessor, FrameControlFlags.Adr);
}
payload = simulatedDevice.CreateUnconfirmedDataUpMessage("1234", fcnt: payloadFcnt, fctrlFlags: FrameControlFlags.AdrAckReq | FrameControlFlags.Adr);
using var secondRequest = CreateWaitableRequest(radioMetadata, payload);
messageProcessor.DispatchRequest(secondRequest);
Assert.True(await secondRequest.WaitCompleteAsync());
// Expectations
// 1. Message was sent to IoT Hub
LoRaDeviceClient.VerifyAll();
LoRaDeviceApi.VerifyAll();
Assert.True(secondRequest.ProcessingSucceeded);
Assert.NotNull(secondRequest.ResponseDownlink);
Assert.Equal(3, DownstreamMessageSender.DownlinkMessages.Count);
downlinkMessage = DownstreamMessageSender.DownlinkMessages[2];
payloadDataDown = new LoRaPayloadData(downlinkMessage.Data);
// We expect a mac command in the payload
Assert.Equal(5, payloadDataDown.Frmpayload.Span.Length);
decryptedPayload = payloadDataDown.Serialize(simulatedDevice.NwkSKey.Value);
Assert.Equal(FramePort.MacCommand, payloadDataDown.Fport);
Assert.Equal((byte)Cid.LinkADRCmd, decryptedPayload[0]);
linkAdr = new LinkADRRequest(decryptedPayload);
Assert.Equal(2, reportedNbRep);
Assert.Equal(2, linkAdr.NbRep);
Assert.Equal(2, loraDevice.NbRep);
// in case no payload the mac is in the FRMPayload and is decrypted with NwkSKey
Assert.Equal(payloadDataDown.DevAddr, loraDevice.DevAddr);
Assert.False(payloadDataDown.IsConfirmed);
Assert.Equal(MacMessageType.UnconfirmedDataDown, payloadDataDown.MessageType);
// 4. Frame counter up was updated
Assert.Equal(payloadFcnt, loraDevice.FCntUp);
// ****************************************************
// Third part send normal messages to decrease NbRep to 1
// ****************************************************
// send a message with a fcnt every 1
for (var i = 0; i < messageCount; i++)
{
payloadFcnt = await SendMessage(currentLsnr, currentDR, payloadFcnt, simulatedDevice, messageProcessor, FrameControlFlags.Adr);
}
payload = simulatedDevice.CreateUnconfirmedDataUpMessage("1234", fcnt: payloadFcnt, fctrlFlags: FrameControlFlags.AdrAckReq | FrameControlFlags.Adr);
using var thirdRequest = CreateWaitableRequest(radioMetadata, payload);
messageProcessor.DispatchRequest(thirdRequest);
Assert.True(await thirdRequest.WaitCompleteAsync());
// Expectations
// 1. Message was sent to IoT Hub
LoRaDeviceClient.VerifyAll();
LoRaDeviceApi.VerifyAll();
Assert.True(thirdRequest.ProcessingSucceeded);
Assert.NotNull(thirdRequest.ResponseDownlink);
Assert.Equal(4, DownstreamMessageSender.DownlinkMessages.Count);
downlinkMessage = DownstreamMessageSender.DownlinkMessages[3];
payloadDataDown = new LoRaPayloadData(downlinkMessage.Data);
// We expect a mac command in the payload
Assert.Equal(5, payloadDataDown.Frmpayload.Span.Length);
decryptedPayload = payloadDataDown.Serialize(simulatedDevice.NwkSKey.Value);
Assert.Equal(FramePort.MacCommand, payloadDataDown.Fport);
Assert.Equal((byte)Cid.LinkADRCmd, decryptedPayload[0]);
linkAdr = new LinkADRRequest(decryptedPayload);
Assert.Equal(1, reportedNbRep);
Assert.Equal(1, linkAdr.NbRep);
Assert.Equal(1, loraDevice.NbRep);
// 5. Frame counter down is updated
Assert.Equal(ExpectedDeviceFcntDown, loraDevice.FCntDown);
Assert.Equal(ExpectedDeviceFcntDown, payloadDataDown.Fcnt);
}
public async Task OTAA_Confirmed_With_Cloud_To_Device_Message_Returns_Downstream_Message(uint initialDeviceFcntUp, uint payloadFcnt)
{
const uint InitialDeviceFcntDown = 20;
var needsToSaveFcnt = payloadFcnt - initialDeviceFcntUp >= Constants.MaxFcntUnsavedDelta;
var simulatedDevice = new SimulatedDevice(
TestDeviceInfo.CreateABPDevice(1, gatewayID: ServerConfiguration.GatewayID),
frmCntUp: initialDeviceFcntUp,
frmCntDown: InitialDeviceFcntDown);
var loraDevice = CreateLoRaDevice(simulatedDevice);
LoRaDeviceClient.Setup(x => x.SendEventAsync(It.IsNotNull <LoRaDeviceTelemetry>(), null))
.ReturnsAsync(true);
if (needsToSaveFcnt)
{
LoRaDeviceClient.Setup(x => x.UpdateReportedPropertiesAsync(It.IsNotNull <TwinCollection>(), It.IsAny <CancellationToken>()))
.ReturnsAsync(true);
}
using var cloudToDeviceMessage = new ReceivedLoRaCloudToDeviceMessage()
{
Payload = "c2d", Fport = TestPort
}
.CreateMessage();
LoRaDeviceClient.SetupSequence(x => x.ReceiveAsync(It.IsAny <TimeSpan>()))
.ReturnsAsync(cloudToDeviceMessage)
.ReturnsAsync((Message)null); // 2nd cloud to device message does not return anything
LoRaDeviceClient.Setup(x => x.CompleteAsync(cloudToDeviceMessage))
.ReturnsAsync(true);
using var cache = EmptyMemoryCache();
using var loraDeviceCache = CreateDeviceCache(loraDevice);
using var deviceRegistry = new LoRaDeviceRegistry(ServerConfiguration, cache, LoRaDeviceApi.Object, LoRaDeviceFactory, loraDeviceCache);
// Send to message processor
using var messageProcessor = new MessageDispatcher(
ServerConfiguration,
deviceRegistry,
FrameCounterUpdateStrategyProvider);
var payload = simulatedDevice.CreateConfirmedDataUpMessage("1234", fcnt: payloadFcnt);
using var request = CreateWaitableRequest(payload);
messageProcessor.DispatchRequest(request);
Assert.True(await request.WaitCompleteAsync());
// Expectations
// 1. Message was sent to IoT Hub
LoRaDeviceClient.VerifyAll();
LoRaDeviceApi.VerifyAll();
// 2. Return is downstream message
Assert.NotNull(request.ResponseDownlink);
Assert.True(request.ProcessingSucceeded);
Assert.Single(DownstreamMessageSender.DownlinkMessages);
var downlinkMessage = DownstreamMessageSender.DownlinkMessages[0];
var payloadDataDown = new LoRaPayloadData(downlinkMessage.Data);
payloadDataDown.Serialize(loraDevice.AppSKey.Value);
Assert.Equal(payloadDataDown.DevAddr, loraDevice.DevAddr);
Assert.False(payloadDataDown.IsConfirmed);
Assert.Equal(MacMessageType.UnconfirmedDataDown, payloadDataDown.MessageType);
// 4. Frame counter up was updated
Assert.Equal(payloadFcnt, loraDevice.FCntUp);
// 5. Frame counter down is updated
Assert.Equal(InitialDeviceFcntDown + 1, loraDevice.FCntDown);
Assert.Equal(InitialDeviceFcntDown + 1, payloadDataDown.Fcnt);
// 6. Frame count has pending changes?
if (needsToSaveFcnt)
{
Assert.False(loraDevice.HasFrameCountChanges);
}
else
{
Assert.True(loraDevice.HasFrameCountChanges);
}
}
public async Task Perform_Rate_Adapatation_When_Possible(uint deviceId, int count, DataRateIndex expectedDR, int expectedTXPower, int expectedNbRep, uint initialDeviceFcntUp)
{
uint payloadFcnt = 0;
const uint InitialDeviceFcntDown = 0;
var simulatedDevice = new SimulatedDevice(
TestDeviceInfo.CreateABPDevice(deviceId, gatewayID: ServerConfiguration.GatewayID),
frmCntUp: initialDeviceFcntUp);
var loraDevice = CreateLoRaDevice(simulatedDevice);
LoRaDeviceClient.Setup(x => x.SendEventAsync(It.IsNotNull <LoRaDeviceTelemetry>(), null))
.ReturnsAsync(true);
LoRaDeviceClient.Setup(x => x.ReceiveAsync(It.IsNotNull <TimeSpan>()))
.ReturnsAsync((Message)null);
LoRaDeviceClient.Setup(x => x.UpdateReportedPropertiesAsync(It.IsNotNull <TwinCollection>(), It.IsAny <CancellationToken>()))
.ReturnsAsync(true);
using var cache = EmptyMemoryCache();
using var loraDeviceCache = CreateDeviceCache(loraDevice);
using var deviceRegistry = new LoRaDeviceRegistry(ServerConfiguration, cache, LoRaDeviceApi.Object, LoRaDeviceFactory, loraDeviceCache);
// Send to message processor
using var messageProcessor = new MessageDispatcher(
ServerConfiguration,
deviceRegistry,
FrameCounterUpdateStrategyProvider);
// In this case we want to simulate a cache failure, so we don't initialize the cache.
if (deviceId != 12)
{
payloadFcnt = await InitializeCacheToDefaultValuesAsync(payloadFcnt, simulatedDevice, messageProcessor);
}
else
{
var payloadInt = simulatedDevice.CreateConfirmedDataUpMessage("1234", fcnt: payloadFcnt);
using var requestInt = CreateWaitableRequest(TestUtils.GenerateTestRadioMetadata(), payloadInt);
messageProcessor.DispatchRequest(requestInt);
Assert.True(await requestInt.WaitCompleteAsync(-1));
payloadFcnt++;
}
for (var i = 0; i < count; i++)
{
var payloadInt = simulatedDevice.CreateUnconfirmedDataUpMessage("1234", fcnt: payloadFcnt, fctrlFlags: FrameControlFlags.Adr);
using var requestInt = CreateWaitableRequest(TestUtils.GenerateTestRadioMetadata(), payloadInt);
messageProcessor.DispatchRequest(requestInt);
Assert.True(await requestInt.WaitCompleteAsync(-1));
payloadFcnt++;
}
var payload = simulatedDevice.CreateUnconfirmedDataUpMessage("1234", fcnt: payloadFcnt, fctrlFlags: FrameControlFlags.AdrAckReq | FrameControlFlags.Adr);
using var request = CreateWaitableRequest(TestUtils.GenerateTestRadioMetadata(), payload);
messageProcessor.DispatchRequest(request);
Assert.True(await request.WaitCompleteAsync());
// Expectations
// 1. Message was sent to IoT Hub
LoRaDeviceClient.VerifyAll();
LoRaDeviceApi.VerifyAll();
Assert.NotNull(request.ResponseDownlink);
Assert.True(request.ProcessingSucceeded);
Assert.Equal(2, DownstreamMessageSender.DownlinkMessages.Count);
var downlinkMessage = DownstreamMessageSender.DownlinkMessages[1];
var payloadDataDown = new LoRaPayloadData(downlinkMessage.Data);
// in this case we expect a null payload
if (deviceId == 11)
{
Assert.Equal(0, payloadDataDown.Frmpayload.Span.Length);
}
else
{
// We expect a mac command in the payload
Assert.Equal(5, payloadDataDown.Frmpayload.Span.Length);
var decryptedPayload = payloadDataDown.Serialize(simulatedDevice.NwkSKey.Value);
Assert.Equal(FramePort.MacCommand, payloadDataDown.Fport);
Assert.Equal((byte)Cid.LinkADRCmd, decryptedPayload[0]);
var linkAdr = new LinkADRRequest(decryptedPayload);
Assert.Equal(expectedDR, linkAdr.DataRate);
Assert.Equal(expectedDR, loraDevice.DataRate);
Assert.Equal(expectedTXPower, linkAdr.TxPower);
Assert.Equal(expectedTXPower, loraDevice.TxPower);
Assert.Equal(expectedNbRep, linkAdr.NbRep);
Assert.Equal(expectedNbRep, loraDevice.NbRep);
}
// in case no payload the mac is in the FRMPayload and is decrypted with NwkSKey
Assert.Equal(payloadDataDown.DevAddr, loraDevice.DevAddr);
Assert.False(payloadDataDown.IsConfirmed);
Assert.Equal(MacMessageType.UnconfirmedDataDown, payloadDataDown.MessageType);
// 4. Frame counter up was updated
Assert.Equal(payloadFcnt, loraDevice.FCntUp);
// 5. Frame counter down is updated
Assert.Equal(InitialDeviceFcntDown + 1, loraDevice.FCntDown);
Assert.Equal(InitialDeviceFcntDown + 1, payloadDataDown.Fcnt);
}
public async Task Perform_TXPower_Adaptation_When_Needed()
{
uint deviceId = 44;
var messageCount = 21;
uint payloadFcnt = 0;
const uint InitialDeviceFcntUp = 9;
const uint InitialDeviceFcntDown = 0;
var simulatedDevice = new SimulatedDevice(
TestDeviceInfo.CreateABPDevice(deviceId, gatewayID: ServerConfiguration.GatewayID),
frmCntUp: InitialDeviceFcntUp);
var loraDevice = CreateLoRaDevice(simulatedDevice);
LoRaDeviceClient.Setup(x => x.SendEventAsync(It.IsNotNull <LoRaDeviceTelemetry>(), null))
.ReturnsAsync(true);
LoRaDeviceClient.Setup(x => x.ReceiveAsync(It.IsNotNull <TimeSpan>()))
.ReturnsAsync((Message)null);
var reportedDR = DR0;
var reportedTxPower = 0;
LoRaDeviceClient.Setup(x => x.UpdateReportedPropertiesAsync(It.IsNotNull <TwinCollection>(), It.IsAny <CancellationToken>()))
.Callback <TwinCollection, CancellationToken>((t, _) =>
{
if (t.Contains(TwinProperty.DataRate))
{
reportedDR = (DataRateIndex)(int)(object)t[TwinProperty.DataRate].Value;
}
if (t.Contains(TwinProperty.TxPower))
{
reportedTxPower = t[TwinProperty.TxPower].Value;
}
})
.ReturnsAsync(true);
using var cache = EmptyMemoryCache();
using var loraDeviceCache = CreateDeviceCache(loraDevice);
using var deviceRegistry = new LoRaDeviceRegistry(ServerConfiguration, cache, LoRaDeviceApi.Object, LoRaDeviceFactory, loraDeviceCache);
// Send to message processor
using var messageProcessor = new MessageDispatcher(
ServerConfiguration,
deviceRegistry,
FrameCounterUpdateStrategyProvider);
payloadFcnt = await InitializeCacheToDefaultValuesAsync(payloadFcnt, simulatedDevice, messageProcessor);
// ****************************************************
// First part gives very good connectivity and ensure we set power to minimum and DR increase to 5
// ****************************************************
// set to very good lsnr and DR3
float currentLsnr = 20;
var currentDR = LoRaDataRate.SF9BW125;
// todo add case without buffer
for (var i = 0; i < messageCount; i++)
{
payloadFcnt = await SendMessage(currentLsnr, currentDR, payloadFcnt, simulatedDevice, messageProcessor, FrameControlFlags.Adr);
}
var payload = simulatedDevice.CreateUnconfirmedDataUpMessage("1234", fcnt: payloadFcnt, fctrlFlags: FrameControlFlags.AdrAckReq | FrameControlFlags.Adr);
var radioMetadata = new RadioMetadata(TestUtils.TestRegion.GetDataRateIndex(currentDR), Hertz.Mega(868.1), new RadioMetadataUpInfo(0, 0, 0, 0, currentLsnr));
using var request = CreateWaitableRequest(radioMetadata, payload);
messageProcessor.DispatchRequest(request);
Assert.True(await request.WaitCompleteAsync());
Assert.NotNull(request.ResponseDownlink);
Assert.Equal(2, DownstreamMessageSender.DownlinkMessages.Count);
var downlinkMessage = DownstreamMessageSender.DownlinkMessages[1];
var payloadDataDown = new LoRaPayloadData(downlinkMessage.Data);
// We expect a mac command in the payload
Assert.Equal(5, payloadDataDown.Frmpayload.Span.Length);
var decryptedPayload = payloadDataDown.Serialize(simulatedDevice.NwkSKey.Value);
Assert.Equal(FramePort.MacCommand, payloadDataDown.Fport);
Assert.Equal((byte)Cid.LinkADRCmd, decryptedPayload[0]);
var linkAdr = new LinkADRRequest(decryptedPayload);
Assert.Equal(DR5, linkAdr.DataRate);
Assert.Equal(DR5, loraDevice.DataRate);
Assert.Equal(DR5, reportedDR);
Assert.Equal(7, linkAdr.TxPower);
Assert.Equal(7, loraDevice.TxPower);
Assert.Equal(7, reportedTxPower);
Assert.Equal(payloadDataDown.DevAddr, loraDevice.DevAddr);
Assert.False(payloadDataDown.IsConfirmed);
Assert.Equal(MacMessageType.UnconfirmedDataDown, payloadDataDown.MessageType);
// 4. Frame counter up was updated
Assert.Equal(payloadFcnt, loraDevice.FCntUp);
// 5. Frame counter down is updated
Assert.Equal(InitialDeviceFcntDown + 1, loraDevice.FCntDown);
Assert.Equal(InitialDeviceFcntDown + 1, payloadDataDown.Fcnt);
// ****************************************************
// Second part reduce connectivity and verify the DR stay to 5 and power set to max
// ****************************************************
currentLsnr = -50;
// DR5
currentDR = LoRaDataRate.SF7BW125;
// todo add case without buffer
for (var i = 0; i < messageCount; i++)
{
payloadFcnt = await SendMessage(currentLsnr, currentDR, payloadFcnt, simulatedDevice, messageProcessor, FrameControlFlags.Adr);
}
payload = simulatedDevice.CreateUnconfirmedDataUpMessage("1234", fcnt: payloadFcnt, fctrlFlags: FrameControlFlags.AdrAckReq | FrameControlFlags.Adr);
var radioMetadataWithDatr5 = new RadioMetadata(TestUtils.TestRegion.GetDataRateIndex(currentDR), Hertz.Mega(868.1), new RadioMetadataUpInfo(0, 0, 0, 0, currentLsnr));
using var secondRequest = CreateWaitableRequest(radioMetadataWithDatr5, payload);
messageProcessor.DispatchRequest(secondRequest);
Assert.True(await secondRequest.WaitCompleteAsync());
Assert.NotNull(secondRequest.ResponseDownlink);
Assert.Equal(3, DownstreamMessageSender.DownlinkMessages.Count);
downlinkMessage = DownstreamMessageSender.DownlinkMessages[2];
payloadDataDown = new LoRaPayloadData(downlinkMessage.Data);
// We expect a mac command in the payload
Assert.Equal(5, payloadDataDown.Frmpayload.Span.Length);
decryptedPayload = payloadDataDown.Serialize(simulatedDevice.NwkSKey.Value);
Assert.Equal(FramePort.MacCommand, payloadDataDown.Fport);
Assert.Equal((byte)Cid.LinkADRCmd, decryptedPayload[0]);
linkAdr = new LinkADRRequest(decryptedPayload);
Assert.Equal(DR5, linkAdr.DataRate);
Assert.Equal(DR5, loraDevice.DataRate);
Assert.Equal(DR5, reportedDR);
Assert.Equal(0, linkAdr.TxPower);
Assert.Equal(0, loraDevice.TxPower);
Assert.Equal(0, reportedTxPower);
Assert.Equal(payloadDataDown.DevAddr, loraDevice.DevAddr);
Assert.False(payloadDataDown.IsConfirmed);
Assert.Equal(MacMessageType.UnconfirmedDataDown, payloadDataDown.MessageType);
// 4. Frame counter up was updated
Assert.Equal(payloadFcnt, loraDevice.FCntUp);
// 5. Frame counter down is updated
Assert.Equal(InitialDeviceFcntDown + 2, loraDevice.FCntDown);
Assert.Equal(InitialDeviceFcntDown + 2, payloadDataDown.Fcnt);
// Expectations
// 1. Message was sent to IoT Hub
LoRaDeviceClient.VerifyAll();
LoRaDeviceApi.VerifyAll();
Assert.True(secondRequest.ProcessingSucceeded);
}
public async Task Perform_DR_Adaptation_When_Needed(uint deviceId, float currentLsnr, string currentDRString, DataRateIndex expectedDR, int expectedTxPower)
{
var currentDR = LoRaDataRate.Parse(currentDRString);
var messageCount = 21;
uint payloadFcnt = 0;
const uint InitialDeviceFcntUp = 9;
const uint ExpectedDeviceFcntDown = 0;
var simulatedDevice = new SimulatedDevice(
TestDeviceInfo.CreateABPDevice(deviceId, gatewayID: ServerConfiguration.GatewayID),
frmCntUp: InitialDeviceFcntUp);
var loraDevice = CreateLoRaDevice(simulatedDevice);
LoRaDeviceClient.Setup(x => x.SendEventAsync(It.IsNotNull <LoRaDeviceTelemetry>(), null))
.ReturnsAsync(true);
LoRaDeviceClient.Setup(x => x.ReceiveAsync(It.IsNotNull <TimeSpan>()))
.ReturnsAsync((Message)null);
var twinDR = DR0;
var twinTxPower = 0;
LoRaDeviceClient.Setup(x => x.UpdateReportedPropertiesAsync(It.IsNotNull <TwinCollection>(), It.IsAny <CancellationToken>()))
.Callback <TwinCollection, CancellationToken>((t, _) =>
{
if (t.Contains(TwinProperty.DataRate))
{
twinDR = t[TwinProperty.DataRate];
}
if (t.Contains(TwinProperty.TxPower))
{
twinTxPower = (int)t[TwinProperty.TxPower];
}
})
.ReturnsAsync(true);
using var cache = EmptyMemoryCache();
using var loraDeviceCache = CreateDeviceCache(loraDevice);
using var deviceRegistry = new LoRaDeviceRegistry(ServerConfiguration, cache, LoRaDeviceApi.Object, LoRaDeviceFactory, loraDeviceCache);
// Send to message processor
using var messageProcessor = new MessageDispatcher(
ServerConfiguration,
deviceRegistry,
FrameCounterUpdateStrategyProvider);
payloadFcnt = await InitializeCacheToDefaultValuesAsync(payloadFcnt, simulatedDevice, messageProcessor);
for (var i = 0; i < messageCount; i++)
{
payloadFcnt = await SendMessage(currentLsnr, currentDR, payloadFcnt, simulatedDevice, messageProcessor, FrameControlFlags.Adr);
}
var payload = simulatedDevice.CreateUnconfirmedDataUpMessage("1234", fcnt: payloadFcnt, fctrlFlags: FrameControlFlags.AdrAckReq | FrameControlFlags.Adr);
var radioMetadata = new RadioMetadata(TestUtils.TestRegion.GetDataRateIndex(currentDR), Hertz.Mega(868.1), new RadioMetadataUpInfo(0, 0, 0, 0, currentLsnr));
using var request = CreateWaitableRequest(radioMetadata, payload);
messageProcessor.DispatchRequest(request);
Assert.True(await request.WaitCompleteAsync());
// Expectations
// 1. Message was sent to IoT Hub
LoRaDeviceClient.VerifyAll();
LoRaDeviceApi.VerifyAll();
Assert.True(request.ProcessingSucceeded);
Assert.NotNull(request.ResponseDownlink);
var downlinkMessage = DownstreamMessageSender.DownlinkMessages[1];
var payloadDataDown = new LoRaPayloadData(downlinkMessage.Data);
// We expect a mac command in the payload
if (deviceId == 221)
{
// In this case, no ADR adaptation is performed, so the message should be empty
Assert.Equal(0, payloadDataDown.Frmpayload.Span.Length);
Assert.Equal(0, payloadDataDown.Fopts.Span.Length);
}
else
{
Assert.Equal(5, payloadDataDown.Frmpayload.Span.Length);
var decryptedPayload = payloadDataDown.Serialize(simulatedDevice.NwkSKey.Value);
Assert.Equal(FramePort.MacCommand, payloadDataDown.Fport);
Assert.Equal((byte)Cid.LinkADRCmd, decryptedPayload[0]);
var linkAdr = new LinkADRRequest(decryptedPayload);
Assert.Equal(expectedDR, linkAdr.DataRate);
Assert.Equal(expectedDR, loraDevice.DataRate);
Assert.Equal(expectedDR, twinDR);
Assert.Equal(expectedTxPower, linkAdr.TxPower);
Assert.Equal(expectedTxPower, loraDevice.TxPower);
Assert.Equal(expectedTxPower, twinTxPower);
// in case no payload the mac is in the FRMPayload and is decrypted with NwkSKey
Assert.Equal(payloadDataDown.DevAddr, loraDevice.DevAddr);
Assert.False(payloadDataDown.IsConfirmed);
Assert.Equal(MacMessageType.UnconfirmedDataDown, payloadDataDown.MessageType);
// 4. Frame counter up was updated
Assert.Equal(payloadFcnt, loraDevice.FCntUp);
// 5. Frame counter down is updated
Assert.Equal(ExpectedDeviceFcntDown + 1, loraDevice.FCntDown);
Assert.Equal(ExpectedDeviceFcntDown + 1, payloadDataDown.Fcnt);
}
}
public async Task Should_Reject(
bool isConfirmed,
bool hasMacInUpstream,
bool hasMacInC2D,
[CombinatorialValues("SF10BW125", "SF9BW125", "SF8BW125", "SF7BW125")] string datr)
{
const int InitialDeviceFcntUp = 9;
const int InitialDeviceFcntDown = 20;
var simulatedDevice = new SimulatedDevice(
TestDeviceInfo.CreateABPDevice(1, gatewayID: ServerConfiguration.GatewayID),
frmCntUp: InitialDeviceFcntUp,
frmCntDown: InitialDeviceFcntDown);
var loraDevice = CreateLoRaDevice(simulatedDevice);
var(radioMetaData, loraPayload) = CreateUpstreamMessage(isConfirmed, hasMacInUpstream, LoRaDataRate.Parse(datr), simulatedDevice);
if (!hasMacInUpstream)
{
LoRaDeviceClient.Setup(x => x.SendEventAsync(It.IsNotNull <LoRaDeviceTelemetry>(), null))
.ReturnsAsync(true);
}
var region = TestUtils.TestRegion;
var c2dMessageMacCommand = new DevStatusRequest();
var c2dMessageMacCommandSize = hasMacInC2D ? c2dMessageMacCommand.Length : 0;
var expectedDownlinkDatr = region.GetDataRateIndex(LoRaDataRate.Parse(datr));
var c2dPayloadSize = region.GetMaxPayloadSize(expectedDownlinkDatr)
- c2dMessageMacCommandSize
+ 1 // make message too long on purpose
- Constants.LoraProtocolOverheadSize;
var c2dMessagePayload = TestUtils.GeneratePayload("123457890", (int)c2dPayloadSize);
var c2dMessage = new ReceivedLoRaCloudToDeviceMessage()
{
Payload = c2dMessagePayload,
Fport = FramePorts.App1,
};
if (hasMacInC2D)
{
c2dMessage.MacCommands.Add(c2dMessageMacCommand);
}
using var cloudToDeviceMessage = c2dMessage.CreateMessage();
LoRaDeviceClient.Setup(x => x.ReceiveAsync(It.IsAny <TimeSpan>()))
.ReturnsAsync(cloudToDeviceMessage);
LoRaDeviceClient.Setup(x => x.RejectAsync(cloudToDeviceMessage))
.ReturnsAsync(true);
using var cache = EmptyMemoryCache();
using var loraDeviceCache = CreateDeviceCache(loraDevice);
using var deviceRegistry = new LoRaDeviceRegistry(ServerConfiguration, cache, LoRaDeviceApi.Object, LoRaDeviceFactory, loraDeviceCache);
// Send to message processor
using var messageProcessor = new MessageDispatcher(
ServerConfiguration,
deviceRegistry,
FrameCounterUpdateStrategyProvider);
using var request = CreateWaitableRequest(radioMetaData, loraPayload, constantElapsedTime: TimeSpan.Zero);
messageProcessor.DispatchRequest(request);
// Expectations
// 1. Message was sent to IoT Hub
Assert.True(await request.WaitCompleteAsync());
Assert.True(request.ProcessingSucceeded);
var shouldHaveADownlink = isConfirmed || hasMacInUpstream;
// 2. Return is downstream message ONLY
// if is confirmed or had Mac commands in upstream message
if (shouldHaveADownlink)
{
Assert.NotNull(request.ResponseDownlink);
// TODO CHANGE THIS WHEN MOVING RXPK in #1086
// Assert.Equal(expectedDownlinkDatr, request.ResponseDownlink.Txpk.Datr);
var downlinkMessage = DownstreamMessageSender.DownlinkMessages[0];
var payloadDataDown = new LoRaPayloadData(downlinkMessage.Data);
payloadDataDown.Serialize(loraDevice.AppSKey.Value);
Assert.Equal(payloadDataDown.DevAddr, loraDevice.DevAddr);
Assert.Equal(MacMessageType.UnconfirmedDataDown, payloadDataDown.MessageType);
if (hasMacInUpstream)
{
Assert.Equal(new LinkCheckAnswer(1, 1).Length, payloadDataDown.Frmpayload.Length);
Assert.Equal(FramePort.MacCommand, payloadDataDown.Fport);
}
}
else
{
Assert.Null(request.ResponseDownlink);
}
LoRaDeviceClient.VerifyAll();
LoRaDeviceApi.VerifyAll();
}
/// <summary>
/// Creates downlink message with ack for confirmation or cloud to device message
/// </summary>
DownlinkPktFwdMessage CreateDownlinkMessage(
Message cloudToDeviceMessage,
LoRaDevice loRaDevice,
Rxpk rxpk,
LoRaPayloadData upstreamPayload,
LoRaOperationTimeWatcher timeWatcher,
ReadOnlyMemory <byte> payloadDevAddr,
bool fpending,
ushort fcntDown)
{
// default fport
byte fctrl = 0;
if (upstreamPayload.LoRaMessageType == LoRaMessageType.ConfirmedDataUp)
{
// Confirm receiving message to device
fctrl = (byte)FctrlEnum.Ack;
}
byte?fport = null;
var requiresDeviceAcknowlegement = false;
byte[] macbytes = null;
byte[] rndToken = new byte[2];
Random rnd = new Random();
rnd.NextBytes(rndToken);
byte[] frmPayload = null;
if (cloudToDeviceMessage != null)
{
if (cloudToDeviceMessage.Properties.TryGetValueCaseInsensitive("cidtype", out var cidTypeValue))
{
Logger.Log(loRaDevice.DevEUI, "Cloud to device MAC command received", LogLevel.Information);
MacCommandHolder macCommandHolder = new MacCommandHolder(Convert.ToByte(cidTypeValue));
macbytes = macCommandHolder.MacCommand[0].ToBytes();
}
if (cloudToDeviceMessage.Properties.TryGetValueCaseInsensitive("confirmed", out var confirmedValue) && confirmedValue.Equals("true", StringComparison.OrdinalIgnoreCase))
{
requiresDeviceAcknowlegement = true;
loRaDevice.LastConfirmedC2DMessageID = cloudToDeviceMessage.MessageId ?? C2D_MSG_ID_PLACEHOLDER;
}
if (cloudToDeviceMessage.Properties.TryGetValueCaseInsensitive("fport", out var fPortValue))
{
fport = byte.Parse(fPortValue);
}
Logger.Log(loRaDevice.DevEUI, $"Sending a downstream message with ID {ConversionHelper.ByteArrayToString(rndToken)}", LogLevel.Debug);
frmPayload = cloudToDeviceMessage?.GetBytes();
Logger.Log(loRaDevice.DevEUI, $"C2D message: {Encoding.UTF8.GetString(frmPayload)}, id: {cloudToDeviceMessage.MessageId ?? "undefined"}, fport: {fport}, confirmed: {requiresDeviceAcknowlegement}, cidType: {cidTypeValue}", LogLevel.Information);
// cut to the max payload of lora for any EU datarate
if (frmPayload.Length > 51)
{
Array.Resize(ref frmPayload, 51);
}
Array.Reverse(frmPayload);
}
if (fpending)
{
fctrl |= (int)FctrlEnum.FpendingOrClassB;
}
// if (macbytes != null && linkCheckCmdResponse != null)
// macbytes = macbytes.Concat(linkCheckCmdResponse).ToArray();
var reversedDevAddr = new byte[payloadDevAddr.Length];
var srcDevAddr = payloadDevAddr.Span;
for (int i = reversedDevAddr.Length - 1; i >= 0; --i)
{
reversedDevAddr[i] = srcDevAddr[srcDevAddr.Length - (1 + i)];
}
var msgType = requiresDeviceAcknowlegement ? LoRaMessageType.ConfirmedDataDown : LoRaMessageType.UnconfirmedDataDown;
var ackLoRaMessage = new LoRaPayloadData(
msgType,
reversedDevAddr,
new byte[] { fctrl },
BitConverter.GetBytes(fcntDown),
macbytes,
fport.HasValue ? new byte[] { fport.Value } : null,
frmPayload,
1);
// var firstWindowTime = timeWatcher.GetRemainingTimeToReceiveFirstWindow(loRaDevice);
// if (firstWindowTime > TimeSpan.Zero)
// System.Threading.Thread.Sleep(firstWindowTime);
var receiveWindow = timeWatcher.ResolveReceiveWindowToUse(loRaDevice);
if (receiveWindow == 0)
{
return(null);
}
string datr = null;
double freq = 0;
long tmst = 0;
if (receiveWindow == 2)
{
tmst = rxpk.Tmst + timeWatcher.GetReceiveWindow2Delay(loRaDevice) * 1000000;
if (string.IsNullOrEmpty(this.configuration.Rx2DataRate))
{
Logger.Log(loRaDevice.DevEUI, "using standard second receive windows", LogLevel.Information);
freq = this.loraRegion.RX2DefaultReceiveWindows.frequency;
datr = this.loraRegion.DRtoConfiguration[this.loraRegion.RX2DefaultReceiveWindows.dr].configuration;
}
// if specific twins are set, specify second channel to be as specified
else
{
freq = this.configuration.Rx2DataFrequency;
datr = this.configuration.Rx2DataRate;
Logger.Log(loRaDevice.DevEUI, $"using custom DR second receive windows freq : {freq}, datr:{datr}", LogLevel.Information);
}
}
else
{
try
{
datr = this.loraRegion.GetDownstreamDR(rxpk);
freq = this.loraRegion.GetDownstreamChannelFrequency(rxpk);
tmst = rxpk.Tmst + this.loraRegion.Receive_delay1 * 1000000;
}
catch (RegionLimitException ex)
{
Logger.Log(loRaDevice.DevEUI, ex.Message, LogLevel.Error);
return(null);
}
}
// todo: check the device twin preference if using confirmed or unconfirmed down
return(ackLoRaMessage.Serialize(loRaDevice.AppSKey, loRaDevice.NwkSKey, datr, freq, tmst, loRaDevice.DevEUI));
}
