public ReaderService(IReaderLowLevel reader)
{
_reader = reader;
_reader.Initialize();
#if CHATTY_READER
Trace.Listeners.Add(new TextWriterTraceListener(CHATTY_OUTPUT_FILE));
#endif
/*
* NOTE: from https://www.dataloggerinc.com/downloads/caenrfid/CAEN_RFID_API_UserMan_rev_04.pdf
*/
/*
* {
* double Gain = 8.0;
* double Loss = 1.5;
* double ERPPower = 1500.0;
* int OutPower;
* OutPower = (int)(ERPPower / Math.Pow(10, ((Gain - Loss - 2.14) / 10)));
* M3Client.reader.SetPower(OutPower);
*
* Console.WriteLine("Set effective radiate power to {0} mW", ERPPower);
* }
* {
* double Gain = 8.0;
* double Loss = 1.5;
* double ERPPower;
* int OutPower;
* OutPower = M3Client.reader.GetPower();
* ERPPower = ((double)OutPower) * ((double)Math.Pow(10, ((Gain - Loss - 2.14) / 10)));
* Console.WriteLine("Current effective radiate power, mW: {0}", ERPPower);
* }*/
}
void MyWorkerThread_Read(object request)
{
if (!_reader.IsReady())
{
_reader.Initialize();
}
object mtag = null;
// TODO: wait for a signal to cancel?
// - how to implement such a signal?
if (OverwriteStatus != null)
{
OverwriteStatus(this, new GenericEventArgs <string>("Singulating tag..."));
}
const int RETRIES = 4;
{
int ntries = 0;
while (mtag == null && ntries < RETRIES) // AS-20160718: decreasing the retries greatly
{
mtag = _reader.SingulateTag();
System.Threading.Thread.Sleep(100);
ntries++;
}
}
if (mtag == null)
{
if (TagRead != null)
{
TagRead(this, new GenericEventArgs <IReadResult>(new ReadResult("Unable to singulate tag!")));
}
return;
}
if (OverwriteStatus != null)
{
OverwriteStatus(this, new GenericEventArgs <string>("Tag singulated. Reading EPC..."));
}
string uri;
var res = DoWithRetries <string>(RETRIES, out uri, (out string uri0) =>
{
DecodeError err;
// NOTE: when reading, be prepared to supply your password!
// how to handle that??
// try to make sense of the tag first
TagEPCURI_SGTIN sgtin0;
err = _reader.ReadEPC_SGTIN(mtag, out sgtin0);
if (err == DecodeError.None)
{
uri0 = sgtin0.Identity.URI;
return(err);
}
// try to fallback to raw URI
TagRaw raw0;
err = _reader.ReadEPC_Raw(mtag, out raw0);
if (err == DecodeError.None)
{
var sbuf = new StringBuilder();
raw0.GetURI(sbuf);
uri0 = sbuf.ToString();
return(err);
}
uri0 = null;
return(err);
});
switch (res)
{
case DecodeError.IO:
// could not read the EPC after the retries, bail out
if (TagRead != null)
{
TagRead(this, new GenericEventArgs <IReadResult>(new ReadResult("Unable to read EPC! Try again.")));
}
return;
case DecodeError.Invalid:
// invalid tag, have to use the GTIN provided by the server
if (TagRead != null)
{
TagRead(this, new GenericEventArgs <IReadResult>(new ReadResult("Unable to decode EPC (empty or invalid format)")));
}
return;
case DecodeError.None:
// good tag, let's roll
break;
}
if (TagRead != null)
{
TagRead(this, new GenericEventArgs <IReadResult>(new ReadResult()
{
URI = uri
}));
}
}