// Process Device Lifecycle Change event
// Add filtering etc as needed
// leave signalrData.data to null if we do not want to send SignalR message
private static void OnDeviceLifecycleChanged(NOTIFICATION_DATA signalrData, EventData eventData, ILogger log)
{
log.LogInformation($"OnDeviceLifecycleChanged");
signalrData.data = JsonConvert.SerializeObject(eventData.Properties);
}
public static async Task Run([EventHubTrigger("devicetelemetryhub", ConsumerGroup = "telemetry-functions-cg", Connection = "EVENTHUB_CS")] EventData[] eventData,
[SignalR(HubName = Signalr_Hub)] IAsyncCollector <SignalRMessage> signalRMessage,
ILogger log)
{
var exceptions = new List <Exception>();
foreach (EventData ed in eventData)
{
try
{
if (ed.SystemProperties.ContainsKey("iothub-message-source"))
{
string deviceId = ed.SystemProperties["iothub-connection-device-id"].ToString();
string msgSource = ed.SystemProperties["iothub-message-source"].ToString();
string signalr_target = string.Empty;
string model_id = string.Empty;
if (msgSource != "Telemetry")
{
log.LogInformation($"IoT Hub Message Source {msgSource}");
}
log.LogInformation($"Telemetry Source : {msgSource}");
log.LogInformation($"Telemetry Message : {Encoding.UTF8.GetString(ed.Body.Array, ed.Body.Offset, ed.Body.Count)}");
DateTime enqueuTime = (DateTime)ed.SystemProperties["iothub-enqueuedtime"];
if (ed.SystemProperties.ContainsKey("dt-dataschema"))
{
model_id = ed.SystemProperties["dt-dataschema"].ToString();
}
NOTIFICATION_DATA signalrData = new NOTIFICATION_DATA
{
eventId = ed.SystemProperties["x-opt-sequence-number"].ToString(),
eventType = "Event Hubs",
eventTime = enqueuTime.ToUniversalTime().ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fff'Z'"),
eventSource = msgSource,
deviceId = deviceId,
dtDataSchema = model_id,
data = null
};
// Process telemetry based on message source
switch (msgSource)
{
case "Telemetry":
OnTelemetryReceived(signalrData, ed, log);
signalr_target = "DeviceTelemetry";
break;
case "twinChangeEvents":
OnDeviceTwinChanged(signalrData, ed, log);
signalr_target = "DeviceTwinChange";
break;
case "digitalTwinChangeEvents":
OnDigitalTwinTwinChanged(signalrData, ed, log);
signalr_target = "DigitalTwinChange";
break;
case "deviceLifecycleEvents":
OnDeviceLifecycleChanged(signalrData, ed, log);
signalr_target = "DeviceLifecycle";
break;
default:
break;
}
if (signalrData.data != null)
{
// send to SignalR Hub
var data = JsonConvert.SerializeObject(signalrData);
await signalRMessage.AddAsync(new SignalRMessage {
Target = signalr_target,
Arguments = new[] { data }
});
}
signalrData = null;
}
else
{
log.LogInformation("Unsupported Message Source");
}
}
catch (Exception e)
{
exceptions.Add(e);
}
}
if (exceptions.Count > 1)
{
throw new AggregateException(exceptions);
}
if (exceptions.Count == 1)
{
throw exceptions.Single();
}
}
// Process Digital Twin Change Event
// Add filtering etc as needed
// leave signalrData.data to null if we do not want to send SignalR message
private static void OnDigitalTwinTwinChanged(NOTIFICATION_DATA signalrData, EventData eventData, ILogger log)
{
log.LogInformation($"OnDigitalTwinTwinChanged");
signalrData.data = Encoding.UTF8.GetString(eventData.Body.Array, eventData.Body.Offset, eventData.Body.Count);
}
