public void ConnectDevice(ICo2DeviceHandler co2DeviceHandler, IDataProcessor dataProcessor,
int vendorId, int productId,
ref JsonOutput output)
{
int co2 = int.MinValue;
double temperature = double.NaN;
_hidDevice = co2DeviceHandler.ConnectDevice(vendorId, productId);
_stream = co2DeviceHandler.OpenStream(_hidDevice);
//the device won't send anything before receiving this packet
byte[] reportId = { 0x00 };
byte[] request = reportId.Concat(_key).ToArray();
co2DeviceHandler.SendSetFeatureSetupRequest(_stream, request);
var attempts = 0;
var exceptionMessage = "no attempts";
while (true)
{
attempts++;
if (attempts == 10)
{
throw new Exception(exceptionMessage);
}
byte[] receivedData = co2DeviceHandler.ReadData(_stream);
if (receivedData.Length == 0)
{
exceptionMessage = "unable to read data";
continue;
}
if (receivedData.Length != 8 && receivedData.Length != 9)
{
exceptionMessage = "transferred amount of bytes (" + receivedData.Length + ") != expected bytes amount (8 or 9)";
continue;
}
if (receivedData.Length == 9)
{
var temp = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0 };
for (var i = 0; i < 8; i++)
{
temp[i] = receivedData[i + 1];
}
receivedData = temp;
}
int[] data = dataProcessor.DecryptData(ref _key, ref receivedData);
if (!dataProcessor.CheckEndOfMessage(ref data))
{
exceptionMessage = "unexpected data from device";
continue;
}
if (!dataProcessor.CheckCheckSum(ref data))
{
exceptionMessage = "checksum error";
continue;
}
dataProcessor.DataProcessing(ref data, ref co2);
dataProcessor.DataProcessing(ref data, ref temperature);
if (co2 != int.MinValue && !temperature.Equals(double.NaN))
{
output = new JsonOutput(co2, temperature, DateTime.Now.ToString("g"));
break;
}
}
co2DeviceHandler.CloseStream(_stream);
}