Re: [Nxtcommand-developers] rolyv19: modified Keep-Alive thread inNXTCommRXTX and NXTCommSun open()
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Re: [Nxtcommand-developers] rolyv19: modified Keep-Alive thread inNXTCommRXTX and NXTCommSun open() method.
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From: Peter J. <ptg...@ch...> - 2006-12-12 06:43:03
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The note at the end of my previous messsage, was just some comment on the NI
document.
This document explicitly mentions that the sleep time is reset after the
KeepAlive command.
I wonder why it is mentioned only there, or why it is mentioned at all,
because (I asume) it is
reset after every command.
Only sending KeepAlive commands during idle time. I didn't think of that.
But why not ?
It probably can be easily implemented setting some timestamp field.
I am just one of the developers. I would be interested in Brian's opinion
about the KeepAlive thread.
Peter Joosten.
-----Original Message-----
From: Roly Vicaria [mailto:ro...@gm...]
Sent: Tuesday, December 12, 2006 5:59 AM
To: ptg...@ch...
Subject: Re: [Nxtcommand-developers] rolyv19: modified Keep-Alive thread
inNXTCommRXTX and NXTCommSun open() method.
So you think the thread should only send keepAlive during the idle time?
If no commands are sent for an X period of time, and send keepAlive is set
to true, send keepAlive message.
So then the thread just needs to check how long it's been since the last
command was sent...would you agree?
Roly V.
On 12/11/06, Peter Joosten <ptg...@ch...> wrote:
I just had a quick look at the system commands. I could not find a
command to change the KeepAlive time programmatically.
That would be my preference.
I agree with your suggestion to make the KeepAlive thread an optional
feature (using a boolean).
This would be usefull for dashboard applications.
If someone returns from a break, he still wants his brick to be turned
on, the BT connection to be alive,
and able to continue playing with the application.
Peter Joosten.
A note:
1 . The NI document says that the KeepAlive command resets the sleep
timer.
Probably all commands reset the sleep timer. It would be very bad design
if the
brick goes asleep while still firing commands. I think the sleep time is
(/should be)
an idle time, time since last command.
-----Original Message-----
From: Roly Vicaria [mailto:ro...@gm...]
Sent: Tuesday, December 12, 2006 3:50 AM
To: ptg...@ch...
Subject: Re: [Nxtcommand-developers] rolyv19: modified Keep-Alive
thread inNXTCommRXTX and NXTCommSun open() method.
OK...I see your point. But what if someone doesn't want to set the
sleep to never, after all, it is a safeguard for battery life. So if the NXT
gives you a choice of setting it to never sleep or not, then how about
setting a boolean of whether or not to send the keep-alive message to give
the user the same choice?
On 12/11/06, Peter Joosten <ptg...@ch...> wrote:
First a little correction. According the National Instruments
Avdvanced
Programming Guide
the KeepAlive command not only reads the current sleep time, but
also resets
the sleep
time counter to zero. (An example of the "added-value" of the NI
document
compared to Lego BTSDK).
This doesn't change my message: Firing periodic keep-alive commands
from the
NXTComm implementations
makes no sense, since the NXT brick can be set to never sleep.
Therefore
this change in the code
should be undone / removed again. This is my personal opinion.
Peter Joosten.
> -----Original Message-----
> From: nxt...@li...
> [mailto:nxt...@li... ]On
Behalf Of
> Peter Joosten
> Sent: Monday, December 11, 2006 6:45 AM
> To: iCommand Developers
> Subject: [Nxtcommand-developers] rolyv19: modified Keep-Alive
thread
> inNXTCommRXTX and NXTCommSun open() method.
>
>
> Hi Rolyv19,
>
> I saw your Keep-Alive thread commited to subversion.
>
> The only thing the Keep Alive command does is read the "sleep"
setting (in
> msec).
> Ok, you may send Keep Alive commands (or any other command) just
> before the
> NXT is falling asleep.
> But why not set the "sleep" setting on your brick manually to
> "never" (value
> = 0).
>
> A desciption of the commands can be found at:
> http://mindstorms.lego.com/Overview/NXTreme.aspx Download the BDK
> documents
>
> >From National Instruments
> http://zone.ni.com/devzone/cda/tut/p/id/4435
>
> Download the The Advanced Progamming Guide. I thinks this is a
very fine
> resource.
> The BDK only describes the command layout. Not giving any "good"
> explanation.
>
> Personally, I had a hard time figuring out from the BDK what
> combinations of
> enumerations
> can be used for what sensor. This guide gives an explanation.
>
> Peter Joosten.
>
>
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