Re: One Bluetooth, two PDA's ?

"Dale DePriest" <Dale@xxxxxxxxxxxxxxxxxx> wrote in message
news:11hp7cubo93k4fc@xxxxxxxxxxxxxxxxxxxxx
> Today, what this means is that the GPS receiver communicates using a
> single serial port connection. This is the protocol understood by every
> GPS receiver I have encountered. The design model is that this is a one
> for one replacement of a serial port piece of wire. This is the way it
> is designed. It is, for security reasons, even more restrictive than a
> wire connection in that you can Y a wire connection using adapters and
> no such facility exists in the current BT protocol.

Not in the protocol, but it does exist in BT modules.

>
> and the
> > issue was that he could not receive the GPS data via Bluetooth on a
> > Bluetooth capable laptop and a Bluetooth capable PDA simultaneously.
>
> That is correct.
> >
> > Is that something that cannot be done? If so, I don't understand why
not.
>
> It is defined that was in the 1.1 BT spec. If you really want to
> understand it you should read the spec. I am not saying it could not be
> designed differently in the future but I am say this is how it was
defined.

But but but.....:
for instance, a uBlox GPS module, which features a standard serial port with
NMEA output, can be reprogrammed to whatever you want to put inside it, just
buy the development kit. Further, a standard serial->Bluetooth module from
Ezurio, for instance, offers multiple connections at the same time, all
using the Serial Profile. All that is needed from the connected serial GPS
module is that NMEA sentences are packed in a simple packet protocol to the
BT module. So, it is perfectly feasible that some manufacturer took fairly
standard components, added some custom code, et voilà, there you have a GPS
receiver that offers simultaneous connections to multiple devices, using
standard BT Serial Profile.

Meindert


.

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