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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