Hi All, i am currently working on a NFCEmulator library wrapper, i found a full project online which emulates an NFC card and another project that acts as the reader, i have been able to run both of these projects with Android Studio and they both seem to work as expected.
Now i am trying to create a wrapper for the NFCEmulator part but i am having some problems wrapping my head around the Extends Service part, I've looked at the example found here, my B4A Project compiles and runs just fine but I just don't get the expected results, below is part of the code for the wrapper.
According to the Android Studio Project, i need to add the following to the Manifest File and which I did.
Has anyone else successfully created a library wrapper where there is a need to Extend a Service, if so would you maybe give me some tips or hints about what i may be doing wrong, as I mentioned the B4A project compiles and runs fine, I do not receive any error logs in the filtered or Unfiltered logs, i have the NFCEmulator app running on my Samsung Galaxy S10+ and the NFC Card Reader app running on my other Samsung Galaxy S9+ when i place both phones back to back i can see the NFC Card Reader app trying to communicate with the Emulator side but as I also mentioned the processCommandApdu function does not seem to be invoked at all, that function is needed obviously to look at the NFC Card Reader app's requests and send a response accordingly.
Any help will be greatly appreciated.
Thanks,
Walter
Now i am trying to create a wrapper for the NFCEmulator part but i am having some problems wrapping my head around the Extends Service part, I've looked at the example found here, my B4A Project compiles and runs just fine but I just don't get the expected results, below is part of the code for the wrapper.
B4X:
public class B4ANFCEmulatorWrapper extends HostApduService{
private String TAG = "Host Card Emulator";
private String STATUS_SUCCESS = "9000";
private String STATUS_FAILED = "6F00";
private String CLA_NOT_SUPPORTED = "6E00";
private String INS_NOT_SUPPORTED = "6D00";
private String AID = "A0000002471001";
private static final String SAMPLE_LOYALTY_CARD_AID = "F222222222";
private String SELECT_INS = "A4";
public String DEFAULT_CLA = "EB";
private int MIN_APDU_LENGTH = 12;
// ISO-DEP command HEADER for selecting an AID.
// Format: [Class | Instruction | Parameter 1 | Parameter 2]
private static final String SELECT_APDU_HEADER = "00A40400";
// "OK" status word sent in response to SELECT AID command (0x9000)
private static final byte[] SELECT_OK_SW = hexStringToByteArray("9000");
// "UNKNOWN" status word sent in response to invalid APDU command (0x0000)
private static final byte[] UNKNOWN_CMD_SW = hexStringToByteArray("0000");
private static final byte[] SELECT_APDU = BuildSelectApdu(SAMPLE_LOYALTY_CARD_AID);
private NFCEmulator nfc;
@Override public void onCreate() {
BA.Log("inside onCreate of B4ANFCEmulator library");
BA.Log("this.getClass: " + this.getClass().toString());
super.onCreate();
startService(new Intent(this, this.getClass())); //Important if the service will be boundinstead of started.
}
@Override
public void onDeactivated(int arg0) {
// TODO Auto-generated method stub
BA.Log("onDeactivated: " + arg0);
nfc.mba.raiseEvent(this, mEventName + "_ondeactivated", new Object[] {arg0});
}
@Override
public byte[] processCommandApdu(byte[] arg0, Bundle arg1) {
// TODO Auto-generated method stub
BA.Log("arg0: " + arg0 + " Bundle: " + arg1.toString());
nfc.mba.raiseEvent(this, mEventName + "_processcommandapdu", new Object[] {arg0});
if (arg0 == null) {
BA.Log("STATUS_FAILED: " + hexStringToByteArray(STATUS_FAILED));
return hexStringToByteArray(STATUS_FAILED);
}According to the Android Studio Project, i need to add the following to the Manifest File and which I did.
nfctargeet is the name of the Service which starts just fine, but I don't see the onDeactivated or the processCommandApdu functions being raised at all, the code inside the service is the following:
B4X:
#Region Service Attributes
#StartAtBoot: False
#End Region
#Extends: com.genesis.nfcemulator.B4ANFCEmulatorWrapper
Sub Process_Globals
'These global variables will be declared once when the application starts.
'These variables can be accessed from all modules.
Private nfc As NFCEmulator
End Sub
Sub Service_Create
nfc.Initialize("nfc")
End SubHas anyone else successfully created a library wrapper where there is a need to Extend a Service, if so would you maybe give me some tips or hints about what i may be doing wrong, as I mentioned the B4A project compiles and runs fine, I do not receive any error logs in the filtered or Unfiltered logs, i have the NFCEmulator app running on my Samsung Galaxy S10+ and the NFC Card Reader app running on my other Samsung Galaxy S9+ when i place both phones back to back i can see the NFC Card Reader app trying to communicate with the Emulator side but as I also mentioned the processCommandApdu function does not seem to be invoked at all, that function is needed obviously to look at the NFC Card Reader app's requests and send a response accordingly.
Any help will be greatly appreciated.
Thanks,
Walter