public async Task SendTripPointToIOTHub(string tripId, string userId, TripPoint tripDataPoint)
{
//Note: Each individual trip point is being serialized separately so that it can be sent over as an individual message
//This is the expected format by the IOT Hub\ML
var settings = new JsonSerializerSettings {ContractResolver = new CustomContractResolver()};
var tripDataPointBlob = JsonConvert.SerializeObject(tripDataPoint, settings);
var tripBlob = JsonConvert.SerializeObject(
new
{
TripId = tripId,
UserId = userId
});
tripBlob = tripBlob.TrimEnd('}');
string packagedBlob = $"{tripBlob},\"TripDataPoint\":{tripDataPointBlob}}}";
if (!CrossConnectivity.Current.IsConnected)
{
//If there is no network connection, save in buffer and try again
Logger.Instance.Track("Unable to push data to IOT Hub - no network connection.");
await AddTripPointToBuffer(packagedBlob);
return;
}
try
{
await iotHub.SendEvent(packagedBlob);
}
catch (Exception e)
{
//An exception will be thrown if the data isn't received by the IOT Hub; store data in buffer and try again
Logger.Instance.Track("Unable to send data to IOT Hub: " + e.Message);
AddTripPointToBuffer(packagedBlob);
}
}
async void Geolocator_PositionChanged(object sender, PositionEventArgs e)
{
// Only update the route if we are meant to be recording coordinates
if (IsRecording)
{
var userLocation = e.Position;
TripPoint previous = null;
double newDistance = 0;
if (CurrentTrip.Points.Count > 1)
{
previous = CurrentTrip.Points[CurrentTrip.Points.Count - 1];
newDistance = DistanceUtils.CalculateDistance(userLocation.Latitude,
userLocation.Longitude, previous.Latitude, previous.Longitude);
if (newDistance > 4) // if more than 4 miles then gps is off don't use
return;
}
var point = new TripPoint
{
TripId = CurrentTrip.Id,
RecordedTimeStamp = DateTime.UtcNow,
Latitude = userLocation.Latitude,
Longitude = userLocation.Longitude,
Sequence = CurrentTrip.Points.Count,
Speed = -255,
RPM = -255,
ShortTermFuelBank = -255,
LongTermFuelBank = -255,
ThrottlePosition = -255,
RelativeThrottlePosition = -255,
Runtime = -255,
DistanceWithMalfunctionLight = -255,
EngineLoad = -255,
MassFlowRate = -255,
EngineFuelRate = -255,
VIN = "-255"
};
//Add OBD data
if (obdDataProcessor != null)
point.HasSimulatedOBDData = obdDataProcessor.IsObdDeviceSimulated;
await AddOBDDataToPoint(point);
CurrentTrip.Points.Add(point);
try
{
if (obdDataProcessor != null)
{
//Push the trip data packaged with the OBD data to the IOT Hub
obdDataProcessor.SendTripPointToIOTHub(CurrentTrip.Id, CurrentTrip.UserId, point);
}
}
catch (Exception ex)
{
Logger.Instance.Report(ex);
}
if (CurrentTrip.Points.Count > 1 && previous != null)
{
CurrentTrip.Distance += newDistance;
Distance = CurrentTrip.TotalDistanceNoUnits;
//calculate gas usage
var timeDif1 = point.RecordedTimeStamp - previous.RecordedTimeStamp;
CurrentTrip.FuelUsed += fuelConsumptionRate * 0.00002236413 * timeDif1.TotalSeconds;
if (CurrentTrip.FuelUsed == 0)
FuelConsumption = "N/A";
else
FuelConsumption = Settings.MetricUnits
? (CurrentTrip.FuelUsed * 3.7854).ToString("N2")
: CurrentTrip.FuelUsed.ToString("N2");
}
else
{
CurrentTrip.FuelUsed = 0;
FuelConsumption = "N/A";
}
var timeDif = point.RecordedTimeStamp - CurrentTrip.RecordedTimeStamp;
//track seconds, minutes, then hours
if (timeDif.TotalMinutes < 1)
ElapsedTime = $"{timeDif.Seconds}s";
else if (timeDif.TotalHours < 1)
ElapsedTime = $"{timeDif.Minutes}m {timeDif.Seconds}s";
else
ElapsedTime = $"{(int)timeDif.TotalHours}h {timeDif.Minutes}m {timeDif.Seconds}s";
if (point.EngineLoad != -255)
EngineLoad = $"{(int)point.EngineLoad}%";
FuelConsumptionUnits = Settings.MetricUnits ? "Liters" : "Gallons";
DistanceUnits = Settings.MetricDistance ? "Kilometers" : "Miles";
OnPropertyChanged("Stats");
}
CurrentPosition = e.Position;
}
async Task AddOBDDataToPoint(TripPoint point)
{
//Read data from the OBD device
point.HasOBDData = false;
Dictionary<string, string> obdData = null;
if (obdDataProcessor != null)
obdData = await obdDataProcessor.ReadOBDData();
if (obdData != null)
{
double speed = -255,
rpm = -255,
efr = -255,
el = -255,
stfb = -255,
ltfb = -255,
fr = -255,
tp = -255,
rt = -255,
dis = -255,
rtp = -255;
var vin = String.Empty;
if (obdData.ContainsKey("el") && !string.IsNullOrWhiteSpace(obdData["el"]))
{
if (!double.TryParse(obdData["el"], out el))
el = -255;
}
if (obdData.ContainsKey("stfb"))
double.TryParse(obdData["stfb"], out stfb);
if (obdData.ContainsKey("ltfb"))
double.TryParse(obdData["ltfb"], out ltfb);
if (obdData.ContainsKey("fr"))
{
double.TryParse(obdData["fr"], out fr);
if (fr != -255)
{
fuelConsumptionRate = fr;
}
}
if (obdData.ContainsKey("tp"))
double.TryParse(obdData["tp"], out tp);
if (obdData.ContainsKey("rt"))
double.TryParse(obdData["rt"], out rt);
if (obdData.ContainsKey("dis"))
double.TryParse(obdData["dis"], out dis);
if (obdData.ContainsKey("rtp"))
double.TryParse(obdData["rtp"], out rtp);
if (obdData.ContainsKey("spd"))
double.TryParse(obdData["spd"], out speed);
if (obdData.ContainsKey("rpm"))
double.TryParse(obdData["rpm"], out rpm);
if (obdData.ContainsKey("efr") && !string.IsNullOrWhiteSpace(obdData["efr"]))
{
if (!double.TryParse(obdData["efr"], out efr))
efr = -255;
}
else
{
efr = -255;
}
if (obdData.ContainsKey("vin"))
vin = obdData["vin"];
point.EngineLoad = el;
point.ShortTermFuelBank = stfb;
point.LongTermFuelBank = ltfb;
point.MassFlowRate = fr;
point.ThrottlePosition = tp;
point.Runtime = rt;
point.DistanceWithMalfunctionLight = dis;
point.RelativeThrottlePosition = rtp;
point.Speed = speed;
point.RPM = rpm;
point.EngineFuelRate = efr;
point.VIN = vin;
#if DEBUG
foreach (var kvp in obdData)
Logger.Instance.Track($"{kvp.Key} {kvp.Value}");
#endif
point.HasOBDData = true;
}
}
void UpdateTripStatistics(TripPoint point)
{
PastTripsDetailViewModel.CurrentPosition = point;
labelOneTitle.Text = PastTripsDetailViewModel.FuelConsumptionUnits;
labelOneValue.Text = PastTripsDetailViewModel.FuelConsumption;
labelTwoTitle.Text = PastTripsDetailViewModel.DistanceUnits;
labelTwoValue.Text = PastTripsDetailViewModel.Distance;
labelThreeTitle.Text = "Elapsed Time";
labelThreeValue.Text = PastTripsDetailViewModel.ElapsedTime;
labelFourTitle.Text = PastTripsDetailViewModel.SpeedUnits;
labelFourValue.Text = PastTripsDetailViewModel.Speed;
}
void UpdateMap(TripPoint point, bool updateCamera = true)
{
if (map == null)
return;
//Get trail position or current potion to move car
var latlng = point == null
? viewModel?.CurrentPosition?.ToLatLng()
: point.ToLatLng();
Activity?.RunOnUiThread(() =>
{
UpdateCar(latlng);
driveLine?.Remove();
var polyOptions = new PolylineOptions();
if (allPoints == null)
{
allPoints = viewModel.CurrentTrip.Points.ToLatLngs();
}
else if (point != null)
{
allPoints.Add(point.ToLatLng());
}
polyOptions.Add(allPoints.ToArray());
if (!driveLineColor.HasValue)
driveLineColor = new Color(ContextCompat.GetColor(Activity, Resource.Color.recording_accent));
polyOptions.InvokeColor(driveLineColor.Value);
driveLine = map.AddPolyline(polyOptions);
if (updateCamera)
UpdateCamera(latlng);
});
}