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Hey guys,
we are trying to make a small embedded sensor device (Crossbow's TelosB mote)[1] talk to a SmartCard reader
via a serial connection.
To do so, we checked which packets are being sent by a open source linux driver to the reader and successfully
replicated the behaviour manually with cutecom[2].
We then implemented a stripped down version of the driver on the mote, but when we attach the reader to it, it
won't answer to the commands sent by the mote.
We recognized a kind of initialization packet received by cutecom and even cat everytime we open a connection:
00 00 80 00 00 00 80 00 80 80 80 80 80 80 80 80 80 80 80
80 00 80 80 80 00 00 80 00 00 00 00 80 00 00 80 00 00
We don't seem to receive that packet when connecting the reader to the mote, though.
Connecting the mote via a null modem cable to the PC and imitating the reader's responses with cutecom does
work, so the driver on the mote is ok.
We have already debugged the 8250.c serial kernel driver with printk()s before every outb() and inb() to the
UART's registers and started writing a miniature user space driver to find out what causes the packet, but we
can't exactly replicate the behaviour manually, yet.
The question is: Does anybody of you know what that packet is about, and what triggers it?
Thanks for your help
Daniel
[1] http://www.xbow.com/Products/Product_pdf_files/Wireless_pdf/TelosB_Datasheet.pdf
[2] http://cutecom.sourceforge.net/
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