private async Task GetData()
{
try
{
Trace.WriteLine(Invariant($"Connecting to {DeviceIP}"));
ClearSmbState();
DateTime localTime = DateTime.Now.ToLocalTime();
string path = Invariant($"smb://{DeviceIP}/airvisual/{localTime.Year}{localTime.Month:00}_AirVisual_values.txt");
var auth = new NtlmPasswordAuthentication(null, credentials.UserName, credentials.Password);
string lastString = null;
var smbFile = new SmbFile(path, auth, SmbFile.FileShareRead | SmbFile.FileShareWrite);
smbFile.Connect();
using (Stream fileStream = smbFile.GetInputStream())
{
var length = fileStream.Length;
Trace.WriteLine(Invariant($"Reading from {path} with size {length} Bytes"));
int bufferSize = 512;
fileStream.Seek(-Math.Min(bufferSize, length), SeekOrigin.End);
var pos = fileStream.Position;
using (var reader = new StreamReader(fileStream, Encoding.ASCII, false, bufferSize))
{
string lastData = await reader.ReadToEndAsync().ConfigureAwait(false);
foreach (var reading in lastData.Split('\n'))
{
if (!string.IsNullOrWhiteSpace(reading))
{
lastString = reading;
}
}
}
}
if (string.IsNullOrWhiteSpace(lastString))
{
throw new IOException("Last String Read From file is empty");
}
Trace.WriteLine(Invariant($"Found data {lastString} from {path}"));
var tokens = lastString.Split(';');
SensorData sensorData = new SensorData
{
//Date;Time;Timestamp;PM2_5(ug/m3);AQI(US);AQI(CN);PM10(ug/m3);Outdoor AQI(US);Outdoor AQI(CN);Temperature(C);Temperature(F);Humidity(%RH);CO2(ppm);VOC(ppb)
updateTime = new DateTime(DateTimeOffset.FromUnixTimeSeconds(ParseLong(tokens, 2)).Ticks)
};
if (lastUpdate != sensorData.updateTime)
{
sensorData.PM25 = ParseValue(tokens, 3);
sensorData.PM25AQI = ParseValue(tokens, 4);
sensorData.PM25AQICN = ParseValue(tokens, 5);
sensorData.PM10 = ParseValue(tokens, 6);
sensorData.OutsidePM25AQI = ParseValue(tokens, 7);
sensorData.OutsidePM25AQICN = ParseValue(tokens, 8);
sensorData.TemperatureC = ParseValue(tokens, 9);
sensorData.TemperatureF = ParseValue(tokens, 10);
sensorData.Humidity = ParseValue(tokens, 11);
sensorData.CO2 = ParseValue(tokens, 12);
UpdateDelta(sensorData);
lastUpdate = sensorData.updateTime;
Trace.TraceInformation(Invariant($"Updated data for device {DeviceIP} for time {sensorData.updateTime}"));
}
}
catch (Exception ex)
{
if (ex.IsCancelException())
{
throw;
}
Trace.TraceError(Invariant($"Failed to get data from {DeviceIP}. {ex.GetFullMessage()}."));
}
}
