hi chris,
the bluetooth spec is, er, circumspect about "maximum" packet size, as
its various transport layers smear such distinctions.
when i wrote the driver, i set a single-write limit at a reasonable 128
bytes, which happens to (accidentally, i admit) coincide with one
packet-size limit.
download rate depends upon a) uart bus speed (slow) and number of nodes
on the piconet. simple answer is that one shimmer slave will deliver
data at a net rate of about 85k baud; ergo, your 512-byte block will be
gone in 60 (milli)seconds.
-steve
On 06/28/2011 07:58 AM, Chris B wrote:
Hello,
I am adding some functionality to an app that enables sensor data logged
to a binary file on the SD card to be downloaded at some later stage via
Bluetooth. I'll be reading a 512 byte page, sending it over bluetooth,
before reading another page. What is the maximum packet size for the
Shimmer 2R bluetooth radio? (I'm assuming it's less than 512 bytes, so
i'll need to chop each page up into a number of packets to be
transmitted). If anyone has experience with this, what sort of download
rate should i be expecting (time to read a page, time to send a packet)?
regards
Chris
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