Hey all,
I'm trying to create a Packet analyzer in nesc/tinyos like Whireshark. I
started by modifying the BaseStation. My first approach was to resize the
messages at the BS so that a timestamp and other relevant packet header fields
could be inserted into the payload. This allows the Java parser to decode any
type of fields in the incoming message. I also use a configuration file(XML)
that indicates the position and size of some fields in the incoming array of
bytes.
The process of resizing seems to consume so much time because it creates an
additional packet, so I decide to relay the data traffic as the BaseStation
does, and to send an addicional packet containing the timestamp and other
header fields for each received packet. In both cases I use a circular buffer
as the input buffer. It does not work as I expect it to work. The problem seems
to be in the part sending to the serial port.
My question is: What´s the maximum number of packets can I send to the serial
Interface? I'm testing the sniffer with a sensor sending data as fast as it
can, but It seems that the Sniffer does not handle all the incoming packets. I
do store them into an input buffer, but the speed of sending to the serial port
seems to be the main issue.
Is it possible to use or write directly to the serial port from a nesc App
without using the serialActiveMessageC component?
I'm thinking to embed a C code into a nesC app, so that I could access directly
to the UART, and send the packet as sequence of bytes as It arrives.
Thanks in Advance.
-Antonio
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