I believe that is correct. The payload size is always TOS_DATA_LENGTH,
no matter how many bytes are actually used...
MS
Heo Heo wrote:
Mike,
I was thinking of a different approach. In the OscopeMsg structure, I
put some extra fields for the TOS_Msg header fields. On the mote running
TOSBase, I copied the TOS_Msg header fields to these Java-based
structures. That should work.
The downside of this approach is there are soem unnecessary fields in
the original OscopeMsg structure. Besides, the TOSBase code is not
"transparent" anymore.
I have a question: since TOS_DATA_LENGTH is a constant which defines
the size of the payload of the TOS message. Does it mean that the size
of the packet transmitted over the air is always fixed (i.e. equal
TOS_DATA_LENGTH + size of some header fields), regardless of how little
the real payload is.
Thanks a lot
Heo
*/Michael Schippling <[EMAIL PROTECTED]>/* wrote:
Warning: answer only relevant to TOS1.x...
I was going to say just look at the Message classes:
net/tinyos/message/Message.java
net/tinyos/oscope/OscopeMsg.java
and the doc for MIG (which generates OscopeMsg.java).
But when I did (because I just refused to use them from
the outset so I never did before) I found that there are
no builtin accessors for the message header. And what's
more the way to get to arbitrary fields is:
protected long getUIntElement(int offset, int length)
So you can't use it from outside OscopeMsg. Somehow I have
come to expect this sort of thing but it still annoys me...
So your two options are A) extend OscopeMsg and add accessors
that call getUIntElement() using your own special knowledge of
the header structure gleaned from tos/types/AM.h; or, B) write
the whole thing yourself (assuming you are not just modifying
the oscope app...). For an example of the DIY option see my code:
http://www.etantdonnes.com/Motes/robocode.tar.gz
MS
Heo Heo wrote:
> I was wondering if there is a way to access the TOS_Msg fields (like
> addr, type, group, strength, etc.) from Java.
>
> The context is that there is a mote running OscilloscopeRF. This
mote
> sends messages (class OscopeMsg) to the base station (connected
to PC
> with Serial forwarder). For each message received at the PC, our
Java
> program (running on the PC) needs to access some fields of the
TOS_Msg
> header.
>
> Thanks a lot for any help.
>
>
>
>
> Everyone is raving about the all-new Yahoo! Mail beta.
>
>
>
>
>
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