// Sends device telemetry data to IoT Hub
        private async Task <bool> SendDeviceEventAsync(LoRaDevice loRaDevice, Rxpk rxpk, object decodedValue, LoRaPayloadData loRaPayloadData, LoRaOperationTimeWatcher timeWatcher)
        {
            var deviceTelemetry = new LoRaDeviceTelemetry(rxpk, loRaPayloadData, decodedValue)
            {
                DeviceEUI = loRaDevice.DevEUI,
                GatewayID = this.configuration.GatewayID,
                Edgets    = (long)(timeWatcher.Start - DateTime.UnixEpoch).TotalMilliseconds
            };

            Dictionary <string, string> eventProperties = null;

            if (loRaPayloadData.IsUpwardAck())
            {
                eventProperties = new Dictionary <string, string>();
                Logger.Log(loRaDevice.DevEUI, $"Message ack received for C2D message id {loRaDevice.LastConfirmedC2DMessageID}", LogLevel.Information);
                eventProperties.Add(C2D_MSG_PROPERTY_VALUE_NAME, loRaDevice.LastConfirmedC2DMessageID ?? C2D_MSG_ID_PLACEHOLDER);
                loRaDevice.LastConfirmedC2DMessageID = null;
            }

            var macCommand = loRaPayloadData.GetMacCommands();

            if (macCommand.MacCommand.Count > 0)
            {
                eventProperties = eventProperties ?? new Dictionary <string, string>();

                for (int i = 0; i < macCommand.MacCommand.Count; i++)
                {
                    eventProperties[macCommand.MacCommand[i].Cid.ToString()] = JsonConvert.SerializeObject(macCommand.MacCommand[i], Formatting.None);

                    // in case it is a link check mac, we need to send it downstream.
                    if (macCommand.MacCommand[i].Cid == CidEnum.LinkCheckCmd)
                    {
                        // linkCheckCmdResponse = new LinkCheckCmd(rxPk.GetModulationMargin(), 1).ToBytes();
                    }
                }
            }

            if (await loRaDevice.SendEventAsync(deviceTelemetry, eventProperties))
            {
                var payloadAsRaw = deviceTelemetry.Data as string;
                if (payloadAsRaw == null && deviceTelemetry.Data != null)
                {
                    payloadAsRaw = JsonConvert.SerializeObject(deviceTelemetry.Data, Formatting.None);
                }

                Logger.Log(loRaDevice.DevEUI, $"message '{payloadAsRaw}' sent to hub", LogLevel.Information);
                return(true);
            }

            return(false);
        }