I don't know an exact message delay figure. There's some software
overhead, and then the MAC protocol which may backoff a random
time to avoid collisions. There's also some indication that there
should be a few milli-sec delay before retrying a message -- see
recent posts and my message reliability reports -- but that might
be receiver related.
MS
ram kishore wrote:
> Hi,
> The robocode you sent gave a deep insight.Thanks Micheal.
> One question;How long(in micro seconds) will the mote wait before
> doing retransmission? This should be protocol specific.
>
> Regards,
> Kishore
>
> On Wed, Jul 30, 2008 at 10:29 PM, Michael Schippling <[EMAIL PROTECTED]>
> wrote:
>> Lets keep this on the help list....
>>
>> As for loop 1, if you enable ACKs in the protocol they are handled
>> in the lower levels and sendDone() is not called until the message
>> is ACKed or times out. Search this list for many ACK explanations,
>> and references to my robocode that makes extensive use of ACKs.
>>
>> As for message copy. You need a message buffer that lasts at least
>> until all the sends are Done. If you can keep track of the buffer
>> from the original message then you can just re-use it, otherwise
>> you should copy it before trying to send again because the send
>> operation will last longer than the scope of the function call,
>> task or not...
>>
>> MS
>>
>>
>> ram kishore wrote:
>>> Hi,
>>>
>>> I put loop 1 because I want a message (ACK) to be received after a
>>> message is sent.Thats why I switched to Receiving mode.
>>> Secondly,putting the re-transmit into separate task and post it form
>>> done() would require the message to be copied again, which is memory
>>> inefficient.
>>>
>>> Regards,
>>> Kishore
>>>
>>> On Tue, Jul 29, 2008 at 11:28 PM, Michael Schippling <[EMAIL PROTECTED]>
>>> wrote:
>>>> beats me...why are you doing loop 1? by the time you get to done()
>>>> transmission should be complete. Also I would put the re-transmit
>>>> into a separate task and post it from done()...
>>>>
>>>> MS
>>>>
>>>> ram kishore wrote:
>>>>> Hi,
>>>>> I did the following:
>>>>>
>>>>> event result_t RsendMsg.sendDone(TOS_MsgPtr msg, result_t
>>>>> success)
>>>>> {
>>>>> result_t txmode,sndmsg;
>>>>>
>>>>> TOSH_uwait(1000);
>>>>>
>>>>> do{
>>>>> /*LOOP 1*/
>>>>> txmode = call CC1000Control.RxMode();
>>>>> }while(!txmode);
>>>>> if ( txmode == SUCCESS )
>>>>> call CLeds.yellowOff();
>>>>>
>>>>> do{
>>>>> /* LOOP2*/
>>>>> sndmsg = call RsendMsg.send(TOS_BCAST_ADDR,12,msg);
>>>>> }while(!sndmsg);
>>>>> if ( sndmsg == SUCCESS )
>>>>> call CLeds.yellowOn();
>>>>>
>>>>> return SUCCESS;
>>>>> }
>>>>>
>>>>> If I remove LOOP 1, then retransmissions occur.But, when LOOP 1 is
>>>>> included no retransmissions occur.
>>>>> What could be the reason.?
>>>>>
>>>>> Regards,
>>>>> Kishore
>>>>> On Mon, Jul 28, 2008 at 11:44 PM, Michael Schippling <[EMAIL PROTECTED]>
>>>>> wrote:
>>>>>> Just some things to try...
>>>>>>
>>>>>> I'd bet that the message buffer gets reused or erased before your
>>>>>> second send can complete. You may also have trouble calling the
>>>>>> send directly from the done, since done is in an "event"
>>>>>> context which is sometimes tantamount to an interrupt, perhaps
>>>>>> try copying the message and posting a task to resend?
>>>>>>
>>>>>> Another possibility is that you are walking over the "normal"
>>>>>> send process. You should check the result of the second send
>>>>>> to see if it's giving you an error. And you may need to put
>>>>>> in some condition variable to block simultaneous sends.
>>>>>>
>>>>>> All that said, TOSBase seems to be a bit of a
>>>>>> hack-to-get-things-to-work so it might not be
>>>>>> easy to modify....
>>>>>>
>>>>>> MS
>>>>>>
>>>>>>
>>>>>> ram kishore wrote:
>>>>>>> Hi all,
>>>>>>> I am using TOS1.1.10 .In the standard receiver application
>>>>>>> TOSBase. I am trying to retransmit the message.I sent a message by
>>>>>>> calling
>>>>>>>
>>>>>>> call RadioSend.send(gpTxMsg);.
>>>>>>>
>>>>>>> For this RadioSend.sendDone(TOS_MsgPtr Msg, result_t success)
>>>>>>> event is generated.
>>>>>>> Hoping that Msg is a pointer to the already transmitted
>>>>>>> message,I call
>>>>>>>
>>>>>>> call RadioSend.send(Msg); to retransmit the same message again.
>>>>>>>
>>>>>>> But the message is not being re-transmitted .
>>>>>>>
>>>>>>> Can somebody tell me what is wrong or how to accomplish
>>>>>>> retransmission?
>>>>>>>
>>>>>>> Regards,
>>>>>>> Kishore
>>>>>>> _______________________________________________
>>>>>>> Tinyos-help mailing list
>>>>>>> [email protected]
>>>>>>>
>>>>>>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
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