[Tinyos-help] AM_INTMSG or TOS_BCAST_ADDR

[Hui KANG]

The message of AM_INTMSG on the receiver will be handled by the
corresponding message handler, i.e., the receiver application should
have the same receiver[AM_INSTMSG]. IF you look further down, you will
find the GenericComm actually have the default interface for all the
incoming messages.

Hui Kang

On 8/2/2007, "Urs Hunkeler" <uhu at gmx.ch> wrote:

>Hi,
>
>Think of AM_INTMSG as something like a port number. It does not identify
>a mote. TOS_BCAST_ADDR is a broadcast address. All nodes that physically
>receive the message will forward it to the application layer. You can
>find more information in this paper: http://www.tinyos.net/papers/ammote.pdf
>
>Cheers,
>Urs
>
>
>Chen Bleed schrieb:
>>
>> Hello, all
>> ¡@
>> Now I am studying for Lesson 4 of TinyOS 1.x tutorial.I have two tmote sky(s) and I also have a problem.
>> ¡@
>> The file IntToRfm.nc has the line "IntToRfmM.Send -> Comm.SendMsg[AM_INTMSG];"I consult IntMsg.h and find out the value of AM_INTMSG is 4(by default, you can change).
>> ¡@
>> The id of One of my tmote is 3. I upload CntToLedsAndRfm program.The other tmote whose id is 4. I upload RfmToLeds program.It works fine.
>> ¡@
>> When I change the code in IntToRfmM.nc/* code - start */if (call Send.send(TOS_BCAST_ADDR, sizeof(IntMsg), &data))  return SUCCESS;/* code - end */
>> ¡@
>> to code/* code - start */if (call Send.send(0x000a, sizeof(IntMsg), &data))  return SUCCESS;/* code - end */
>> ¡@
>> I want to transmit message to mote 10 but mote 4 still receives messages.(I know TOS_BCAST_ADDR is 0xffff).Then I run CntToLedsAndRfm on TinyViz and create 30 motes.I see all motes has shot radio purple line to mote 10(use radio plugin).I am confused!!!
>> ¡@
>> So, I cannot change this result(mote 4 receives messages) even if I modify the destination address??Indeed, I dont know the relation between AM_INTMSG and TOS_BCAST_ADDR.Does anyone explain it??
>> thx all, and sorry for my bad English.Chen, Chien Mao
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