[Tinyos-help] Best TOSH_DATA_LENGTH ?

[Raffaele Gravina]

Longer messages will reduce the data overhead introduced by headers.
However, shorter messages have a smaller error probability and the cost of a
retransmission would be lower. Chosing the largest message size is not the
best solution ever. For instance, higher messages could result in longer
delays.

I read somewhere that 30-31 bytes would be a good trade-off.

Using telosb and TinyOS 2.1, the largest TASH_DATA_LENGTH i was able to set
is 114 bytes.

Cheers,

Raf

2009/7/28 Rémi Villé <ville.remi at gmail.com>

> Hi,
>
> TOSH_DATA_LENGTH is about 20-30 byte, depending of the mote. I have read
> that we can increase this value to something like 100 byte.
> But what would be the reason to choose a 100 byte payload rather than a 30
> byte one ?
> I mean if I have 100 byte to send, should I send 4 packet of 30 byte ?
> Maybe because if there's one error in the message (CRC detection) I should
> retransmit 100 byte rather than 30 byte...
>
> I don't know which is the best way to choose a good TASH_DATA_LENGTH
> (assuming that I have an infinite number of byte to send), maybe by
> experimentation or by analyzing? or maybe the default length has been chosen
> with this considerations?
>
> Thanks,
>
> Rémi
>
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-- 
Raffaele Gravina | Research Engineer

Wireless Sensor Networks Lab Berkeley
2000 Hearst Ave, suite 304
Berkeley, CA 94709
+1 510 666 0174 ext. 101
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