[Pcsclite-muscle] Unable to detect SCardGetStatusChange() after write

[Allen Curtis]

Hello,

I have an interesting problem. I have a program with 2 threads. One monitors SCardGetStatusChange() and performs actions with the tag taken on/off the reader. The other thread performs write operations to the tag on demand.

Both threads have their own context:
SCARDCONTEXT context = 0; ///< context for this thread
rv = SCardEstablishContext(SCARD_SCOPE_SYSTEM, NULL, NULL, &context);

Create their own card connections in shared mode:
DWORD dwActiveProtocol = SCARD_PROTOCOL_UNSET;
LONG rv = SCardConnect(
	context,
	m_ntag->reader_name,
	SCARD_SHARE_SHARED,
	(SCARD_PROTOCOL_T0 | SCARD_PROTOCOL_T1),
	&handle,
	&dwActiveProtocol);

Both threads release the card context immediately after accessing it.
        SCardDisconnect(handle, SCARD_RESET_CARD); // SCARD_RESET_CARD);
        SCardReleaseContext(context);

As long as the tag is not written to, SCardGetStatusChange() reliably detects the reader/card state changes. After the write, state changes are no longer detected.

        bool is_tag_present = (m_ntag->reader_state.dwCurrentState & SCARD_STATE_PRESENT);

Any idea what the issue might be?

Thanks