My experience is that the data rate is limited, first by the "UART"
speed (for tmote using USB, I think this is not an issue, but micaz's
over serial are possibly baud-rate bound) and then by the radio
packet cycle time...for the most part I think 200 standard sized
messages a sec is the practical limit. Mica2's are limited to about
25 msg/sec by the radio speed itself.
Search back on this list for the logic of 29 byte payloads,
and advice about increasing such.
MS
Nashwa Abo Elneel wrote:
Hi,
I have a question regarding the oscilloscope application in lesson 6 of
TinyOs 1.x tutorial. the application states that the maximum Payload
size of a TinyOS frame is 29 bytes however it doesn't put any limitation
regarding the serial data forwarder. does this mean that the maximum
data rate achieved by the serial forwarder is equal to the UART chosen
baud rate. and if each packet has about 34 Bytes as explained in detail
down then the serial forwarder can achieve a data rate of about 200
packets per second?
Does anyone know why the payload size was limited to 29 bytes only? can
it be increased?
The high data rate is necessary for me since i am having a high data
rate application and would like to achieve a reasonable packets per size
which are not supported by the Xserve application of Moteworks which
limits the packets to 5 packets per second making it unsuitable for my
application.
anybody has ideas?
Regards,
Nashwa
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