You will have to, at minimum, recompile and reload all programs
that use the message structure. I haven't used/looked at BcastInject
so I don't know if it even has facility for receiving messages, but
certainly it would need to be modified to interpret your new message.
As to changing structs, only one element of a union _should_ be used
at a time, unless you want to enter the obfuscated C contest. You
could add the destaddr to the LogMsg struct if you like. I just made
my suggestions based on what is in the existing files and an educated
guess that someone had already made a stab at thinking about it...
I'm afraid most of what you are asking about are either general
design or programming issues. I think you need to learn some more 'C'
and Java before you torture yourself with the vagaries of TOS. Sun
has a pretty good online Java tutorial, and a copy of the K&R C book
would hopefully be useful.
For searching the help list,
first, as someone already suggested, Google should be your friend;
then Moteiv has a good page: http://www.moteiv.com/community/TinyOS_Information
and finally there is the wiki, but it seems to be partially content free:
http://cents.cs.berkeley.edu/tinywiki/index.php
MS
Hieu Tran wrote:
Thank you so much.
However, in my case, if I add LogMsg into "args" union. I am not sure
for 2 possibilities:
- Can I still use BcastInject since this program is written to support
old SImpleCmd struct? For me, it is really complecated to make change to
some java programes.
- Since "args" is union, I can only use one field at the moment. In my
program, I want the packet have to the destination address (in the
"read_log_args rl_args" field, in my program it is TOSBase mote address)
and sample values (ex: photo values). So can I use union here?
I look forward to hearing from you!
Regards!
Tran Chi Hieu
*/Michael Schippling <[EMAIL PROTECTED]>/* wrote:
it looks like someone thought this would be a good idea and included
some intriguingly named objects in SimpleCmdMsg.h. Like
"start_sense_args
ss_args" and "LogMsg". But I don't find them used anywhere.
You could probably add LogMsg to the "args" union and
create a new action type for returned sense data. Just make sure
the whole struct size is under 29 bytes as defined in types/AM.h.
Hopefully the rest of the code will ignore messages it doesn't
understand.
MS
Hieu Tran wrote:
> Hi all!
> I am doing a simulation in TinyOS tutorial, Lesson 7 (Injecting and
> Broadcasting packets). I have 3 motes, in that one mote programmed
> as TOSBase. Two motes programmed with Bcast, in which one mote as
Relay
> node (receive packet and forward, mote address 1), one mote as
> destination (mote address 2).
> I modify the BcastInject, from cygwin command I want to tell mote
2 to
> do something. (mote address is received from command as argument
and put
> in the SimpleCmdMsg struct):
>
> typedef struct SimpleCmdMsg {
> int8_t seqno;
> int8_t action;
> uint16_t source;
> uint8_t hop_count;
> union {
> start_sense_args ss_args;
> read_log_args rl_args;// I put mote address here
> uint8_t untyped_args[0];
> } args;
> } SimpleCmdMsg;
>
>
> (For example If I want to tell Mote 2 Led_on, from cigwin I type
> .................led_on 2)
>
> Packet will be transmitted from TOSBase -> Relay Node (Mote 1) (it
> receive packet, check mote address, and know that packet does not
belong
> to it, it forward packet ) -> Destination (Mote 2).
>
> with simple applications such as led_on, sound_on, my simulation
work well.
>
> Now, I want to tell mote 2 to do some other works, such as it
take light
> samples from sensing board and transmit these values back to TOSBase
> (mote 2 -> mote 1 -> TosBase). Of course I will have to modify
> BcastInject and Bcast. However, I do not know how to put these
values in
> the SimpleCmd struct to transmit.
>
> typedef struct SimpleCmdMsg {
> int8_t seqno;
> int8_t action;
> uint16_t source;
> uint8_t hop_count;
> union {
> start_sense_args ss_args;
> read_log_args rl_args;
> uint8_t untyped_args[0];
> } args;
> } SimpleCmdMsg;
> How can I put the sample values in to the SimpleCmd struct?
> Because I learnt that BcatsInject, Bcast all use SimpleCmd struct to
> transmit and receive packet. Do I need to use other struct in my
> simulation? (in both directions, from TOSBase to Destination and
from
> Destination to TOSBase).
> In that case, can I still use BcastInject?
>
> can you give me some suggestion to overcome this trouble? Many
thanks!
>
> Regards!
>
>
>
>
>
>
>
>
>
>
>
>
>
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