This means that the set_protocol patch is incorrect. the a4 is a proper T=0 ack byte. (and my assumptions about what usb T=0 devices do don't apply here)send: 00 a4 00 0c 02 3f 00 recv: a4
You didn't say what actually happens when eutron_send only gets/sends 5 bytes. Does the card reply at all in that case?
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