04-23-2010
Most apps that are worried about that use some sort of short packet header kind of ack-back system example:
One system I just coded used packet header format:
nnnnnnnnXXmmmmmmmmmm
where nnnnnnnnn= zero-filled len of whole packet
XX == type of packet: DT == data AK == acknowledge
mmmmmm==unique packet identifier, rolling
An AK packet is 00000020AK0000001234, with only 20 bytes is sent back to acknowledge a datapacket named 00000576DT0000001234
The system expects an AK packet back in 1 minute or less, AK
packets are stored in a queue with a timestamp. I can check for receipt success or resend status. There are also keepalive packets of the same short format sent every 30seconds, for low traffic times.
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LEARN ABOUT CENTOS
isodump
isodump(5) Linux IEEE 1394 isodump(5)
NAME
isodump - format of IEEE 1394 isochronous packets dump file
DESCRIPTION
The isodump format stores a series of IEEE 1394 isochronous stream packets (possibly from multiple channels), including their headers. Its
main use is as the output format of dumpiso(1) and the input format of sendiso(1).
The 32 byte header starts at offset 0 with the string "1394 isodump v1" followed by a zero byte. The next 8 bytes form a 64 bit big endian
integer, which represents a bit mask of the channels that were dumped. A set bit at position (1 << x) signifies that channel x was being
listened on. The following 8 bytes are set to zero.
The iso packets follow the header and are appended to the data stream in the order they were received. The packets consist of the header
quadlet as originally received and the data quadlets following directly. The CRC quadlets after header and data do not appear and every-
thing is in big endian, as seen on the bus.
There is no further framing of the packets in the format, packet boundaries can be found by looking at the data size field in the header
quadlet of each packet. The data size field appears in the most significant 16 bits of the header quadlet, contain the size in bytes (the
actual packet is padded to a multiple of four bytes) and do not include the header packet.
COMPATIBILITY
This format was introduced with the iso send and dump tools distributed with libraw1394. No one else uses it so far.
SEE ALSO
sendiso(1), dumpiso(1)
AUTHOR
Andreas Bombe <aeb@debian.org>
libraw1394 2.1.0 isodump v1 isodump(5)