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michelcandido / btstack

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btstack gps demo freezes after a few minutes #94

Closed GoogleCodeExporter closed 8 years ago

GoogleCodeExporter commented 8 years ago 
What steps will reproduce the problem?
1. turn off iPhone BT
2. turn on external bluetooth gps device (Qstarz BT-Q818X)
3. open GPS app (btstack gps, from cydia store) (DEMO VERSION)
4. wait a minute

What is the expected output? What do you see instead?
Everything works great for a minute or so, but then the app seems to give up.  
When running, all the numbers are rapidly changing, everything looks good.  But 
after a few minutes, it all stops completely.  

What version of the product are you using? On what operating system?
iOS 4.1 (jailbroken)
BTStack GPS 1.5-25900 (demo version)

Please provide any additional information below.
I know the demo version wont pass GPS data to other apps, but I dont want to 
buy the full version if it will have the same issue.  Is the demo version 
supposed to time out after a minute or is this a true problem?

Original issue reported on code.google.com by josh.gru...@gmail.com on 3 Nov 2010 at 1:44

GoogleCodeExporter commented 8 years ago 
hi. no this is not intended. can you get /tmp/hci_dump.pklg from your device 
after this happens and upload it here please?

Original comment by matthias.ringwald@gmail.com on 3 Nov 2010 at 1:49

GoogleCodeExporter commented 8 years ago 
Yes, although not now.  I am at work.  When I get home tonight I will run 
through the process again and get that .pklg file for you.

Original comment by josh.gru...@gmail.com on 3 Nov 2010 at 1:51

GoogleCodeExporter commented 8 years ago 
at work too, and usually much slower with responses. don't worry :)

Original comment by matthias.ringwald@gmail.com on 3 Nov 2010 at 2:01

GoogleCodeExporter commented 8 years ago 
Okay, so I got home and tried it again.  This time, it worked like a charm.  So 
I'm gonna go ahead and say that you fixed it!  Thanks Matthias, I'll be 
purchasing a full license.

Original comment by josh.gru...@gmail.com on 3 Nov 2010 at 11:30

GoogleCodeExporter commented 8 years ago 
well. thanks for letting me know, and let's hope that it will stay that way.

Original comment by matthias.ringwald@gmail.com on 4 Nov 2010 at 9:15

GoogleCodeExporter commented 8 years ago 
Okay, bad news.  I tried an on-road test this morning en route to work and the 
same problem happened again.  In fact, it happened repeatedly.  The good news 
is that I realized I can email the file you requested straight out from iFile.  
So I waited for BTstack to freeze, then emailed the file to myself, then 
started over.  I got through several iterations of this process, so I have 
several versions of the file, all of which are a different file size, so I hope 
there is useful information here.  
I have attached them all, in chronological order.  I added a 1-5 in the title 
of the file so you can tell the chronological order.

I'd say it took about a minute each time for the freeze to happen.  One time it 
happened shortly after the screen auto-locked on me.  So the next time I got it 
working, I used an SBSettings toggle to disable autolock.  Doing that triggered 
another freeze as well.

Thoughts?

Original comment by josh.gru...@gmail.com on 4 Nov 2010 at 1:35

Attachments:

GoogleCodeExporter commented 8 years ago 
thanks for the logs. 
 * can you try with screen auto-lock disabled (in the settings without any hacks) and not pressing the power/sleep button? 
 * what's that other device that constantly connects to your iPhone and does a service discovery request? (it's different from the ones by Mac and Windows)

Other than that, it looks like the GPS just stops sending. This might be 
related to a bug in the credit-based flow control, I cannot tell at the moment 
who's fault it is. The freeze just means no data coming in, not really that the 
device locks up (which is good)

And yes, iFile (even the free version) is awesome. :)

Original comment by matthias.ringwald@gmail.com on 4 Nov 2010 at 1:49

GoogleCodeExporter commented 8 years ago 
Okay, I disabled auto-lock in settings (the normal way).  The freeze happened 
almost immediately.  Here's the log.

The other device you saw in this morning's logs has got to be the BMW bluetooth 
telephone service.  Think that could part of the problem?  Although now that 
I'm in the office, there's no way BMW bluetooth is getting in the way.

Original comment by josh.gru...@gmail.com on 4 Nov 2010 at 2:09

Attachments:

GoogleCodeExporter commented 8 years ago 
the BMW bluetooth is not supposed to create a problem. in log #6, which is very 
short, the GPS stops sending after only 4 messages although it received 48 
credits. Here is suspect the GPS to be either broken or maybe the battery is 
down? Can you make sure the battery is fully charged? (blind-guessing as there 
are no anomalies in that last file)

Original comment by matthias.ringwald@gmail.com on 4 Nov 2010 at 2:15

GoogleCodeExporter commented 8 years ago 
I got this device in the mail yesterday and charged it to full right away.  I 
doubt the battery is the problem.  It may be a faulty device entirely.  After 
the last attempt (the super-short one), I got the connection working again.  
It's holding pretty good for now, and has held strong for a while.  If it 
freezes again, I'll post a log.  In addition, when I get a chance (may be a few 
days), I will try it on my girlfriend's phone.  If she has the same problem, I 
will return the GPS device for a replacement.

Thanks for your help!

Original comment by josh.gru...@gmail.com on 4 Nov 2010 at 2:26

GoogleCodeExporter commented 8 years ago 
The lock held for almost an hour, so I went ahead and purchased a full license 
so I could run some tests with my desired app. (Harry's Lap Timer)  

I've got a question for you.  When I use Harry's app without the BTstack (using 
iPhone internal GPS), the app tells me I'm getting about 1hz updates and 
accuracy of roughly 100ft.  When I use BTstack and the external GPS, the app 
tells me I'm getting a little over 3hz updates and accuracy of roughly 5 ft.  
So it looks like I'm getting better info to the app with the BTstack and 
external GPS.

However, Harry's app says "no NMEA device connected", regardless of whether I 
am using the external GPS device.  Is that normal?  Should it recognize the GPS 
device as an NMEA device?

Original comment by josh.gru...@gmail.com on 4 Nov 2010 at 3:04

GoogleCodeExporter commented 8 years ago 
The number of updates reflects how often the GPS (which sometimes can be 
configured) sends an update. So, if you get 3 samples/s, well, that's it. The 
accuracy reported by BTstack GPS is fixed/fake as I've said before.

As far as I know, the Apple SDK does not provide a way to figure out where the 
locations reported by the LocationManger do come from. Please ask "Harry" how 
the app decides that where the data is coming from :)

Original comment by matthias.ringwald@gmail.com on 4 Nov 2010 at 4:08

GoogleCodeExporter commented 8 years ago 
I heard back from Harry.  

"LapTimer accesses sensors either using the Apple API or directly. Direct 
access = NMEA access is supported for TomTom and G-FI only. BTstack replaces 
Apple's API, LapTimer doesn't see the difference, although the quality is much 
better."

Original comment by josh.gru...@gmail.com on 4 Nov 2010 at 4:44

GoogleCodeExporter commented 8 years ago 
wow. that was fast. Sounds good to me. (Not sure why external GPS are better by 
default. It depends on the used hardware).

Original comment by matthias.ringwald@gmail.com on 4 Nov 2010 at 4:49

GoogleCodeExporter commented 8 years ago 
Yeah, Harry's laptimer app is great, and he is very responsive to users (as are 
you).  I only took a snippet from his email; he is the one that recommended 
this particular external GPS device to me, so I think he was referring to that 
particular external device improving the quality of the GPS info available to 
the app.  

Thanks again for all your help.  I will keep updating here as the situation 
progresses.

Original comment by josh.gru...@gmail.com on 4 Nov 2010 at 5:02

GoogleCodeExporter commented 8 years ago 
Problems.
Ran another test on the way home and it seems to have frozen again.  HOWEVER, 
this time it went another step.  After working, freezing, working, freezing, 
(pulling hci_dump each time) it stopped working entirely.  The GPS app gets 
hung at "Activating BTstack..."  Worse yet, it seems that the file we've been 
discussing isn't being updated with this problem.  I tried closing the app 
manually...  I tried doing a full respring... Only a true power cycle solved 
the problem.

This seems to belie blaming the GPS hardware, dont you think?

Original comment by josh.gru...@gmail.com on 4 Nov 2010 at 10:53

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GoogleCodeExporter commented 8 years ago 
How do you disable BTstack and go back to normal iPhone bluetooth?

Original comment by josh.gru...@gmail.com on 4 Nov 2010 at 11:37