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Old January 28th, 2013, 04:06 PM   #1
John ChesapeakeJohnny is offline
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Nexus 7 & Garmin GDL39 - bluetooth issues

Hi folks.

First posting here.

I have a Nexus 7 and a Garmin GDL39. The Nexus 7 keeps dropping the bluetooth connection with the Garmin data link. Further, I have to unpair and redo the pairing each time I link them in order to access the GDL39 via bluetooth.

Anyone else experiencing such issues? Have a fix?

Here's the response I got from Garmin. They were very responsive and answered my query within a day!

"Hello John,

Thank you for your feedback and using Garmin Pilot.

We are working on a solution with Android OS Bluetooth. The Bluetooth on Android devices has been notorious so flaking out and we are working with them on a solution."



I'm thinking that rolling the Nexus 7 back to 4.1.2 may have to be the fix for now.
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Old January 28th, 2013, 04:18 PM   #2
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Re: Nexus 7 & Garmin GDL39 - bluetooth issues

John,
I don't know the answer to your problem, hopefully someone will chime in.

You could also consider posting in the Garmin Pilot Tips Tech thread, lots of knowledgeable users there too.
http://www.pilotsofamerica.com/forum...ad.php?t=55973
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Old January 28th, 2013, 05:22 PM   #3
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Re: Nexus 7 & Garmin GDL39 - bluetooth issues

I don't want to hijack the thread, but I have the same issue with my Galaxy Tab 10.1. I hope there's a solution, and it's common throughout the Android OS...
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Old January 28th, 2013, 05:28 PM   #4
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Re: Nexus 7 & Garmin GDL39 - bluetooth issues

Oh boy.....the Apple cheering squad is gonna love this one.....
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Old January 28th, 2013, 05:49 PM   #5
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Re: Nexus 7 & Garmin GDL39 - bluetooth issues

Huh... I've got over 50 hours of pairing my Nexus 7 with bluetooth serial port profiles from my simulator (MSFlightSim with FSUIPC), my laptop , a HOLUX GPS, and various other network devices with bluetooth dongles on serial ports.

I've NEVER had any issues with the bluetooth pairing. I'd suspect Garmin is blaming Android instead of the GDL39. I've had occasional issues where I'll have to disconnect/reconnect the GPS device in Garmin Pilot, but that's NOT re-pairing the bluetooth link. I've never had to do that, ever.

I believe Jay has a GDL39 and uses it with the Nexus and Garmin Pilot app. Hopefully he'll chime in.
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Old January 28th, 2013, 06:01 PM   #6
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Re: Nexus 7 & Garmin GDL39 - bluetooth issues

Which OS are you running on the Nexus 7? 4.2?

I'm thinking it may not be a Garmin issue, as a web search of the last month revealed hundreds of complaints about Android's 4.2 update causing bluetooth issues.

J

Quote:
Originally Posted by TMetzinger View Post
Huh... I've got over 50 hours of pairing my Nexus 7 with bluetooth serial port profiles from my simulator (MSFlightSim with FSUIPC), my laptop , a HOLUX GPS, and various other network devices with bluetooth dongles on serial ports.

I've NEVER had any issues with the bluetooth pairing. I'd suspect Garmin is blaming Android instead of the GDL39. I've had occasional issues where I'll have to disconnect/reconnect the GPS device in Garmin Pilot, but that's NOT re-pairing the bluetooth link. I've never had to do that, ever.

I believe Jay has a GDL39 and uses it with the Nexus and Garmin Pilot app. Hopefully he'll chime in.
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Old January 28th, 2013, 06:42 PM   #7
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Re: Nexus 7 & Garmin GDL39 - bluetooth issues

Android 4.2.1 is available and contains a bunch of bug fixes.
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Old January 28th, 2013, 06:45 PM   #8
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Re: Nexus 7 & Garmin GDL39 - bluetooth issues

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Originally Posted by JimNtexas View Post
Android 4.2.1 is available and contains a bunch of bug fixes.
I have that update installed. It seems to be the very one that folks are clamoring about as causing bluetooth problems ...
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Old January 28th, 2013, 08:17 PM   #9
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Re: Nexus 7 & Garmin GDL39 - bluetooth issues

I'm at 4.2.1 JOP40D on my Nexus 7. Bluetooth is fine.
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Old January 28th, 2013, 08:43 PM   #10
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Re: Nexus 7 & Garmin GDL39 - bluetooth issues

Quote:
Originally Posted by ChesapeakeJohnny View Post
I have that update installed. It seems to be the very one that folks are clamoring about as causing bluetooth problems ...
Yep, I have 4.2.1 on my Nexus 7 3G and it's been nothing but trouble for Bluetooth with the GDL 39. I finally found something that said to kill some random services and that seemed to allow it to connect, but I don't know if that solved it until the next reboot or just for when I tried it. I haven't tested it in a while, busy with other things.

Last edited by chartbundle; January 28th, 2013 at 09:25 PM.
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Old January 28th, 2013, 08:56 PM   #11
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Quote:
Originally Posted by chartbundle View Post
Yep, I have 4.2.1 on my Nexus 7 3G and it's been nothing with trouble for Bluetooth with the GDL 39. I finally found something that said to kill some random services and that seemed to allow it to connect, but I don't know if that solved it until the next reboot or just for when I tried it. I haven't tested it in a while, busy with other things.
ah... mine is wifi-only. may be the difference.

Sent from my Nexus 7 using Tapatalk HD
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Old January 28th, 2013, 11:40 PM   #12
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I have several Bluetooth devices -- I'm using one right now, in fact (we're cranking Willie Nelson on the hangar stereo, connected via Bluetooth) -- and they ALL effortlessly and automatically connect to my Nexus 7.

EXCEPT the GDL-39. I have had difficulty with the GDL-39 not AUTOMATICALLY connecting to my Nexus 7 via Bluetooth. This doesn't mean I can't connect, it just means that I have to go through the whole "scan for available devices" process -- which is a PIA but not hard.

I think Garmin is hosing you. I'm guessing that there is something in their firmware that is not copacetic. Or maybe, worse, you've got a problem with your GDL-39. Or both.

Can you connect your Nexus 7 to other Bluetooth devices? Gotta start by eliminating some variables.
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Old January 29th, 2013, 07:33 AM
Posted in reply to Jay Honeck's post starting "I have several Bluetooth devices -- I'm..."
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Re: Nexus 7 & Garmin GDL39 - bluetooth issues

Next stop - trying the Nexus w/ other bt devices. Also will try wife's iPhone with GDL39 + Garmin Pilot at same time. Her phone linked to it with no problem during a flight on Saturday, but we didn't try utilizing it via the Garmin software. I'll report the results.


J


Quote:
Originally Posted by Jay Honeck View Post
I have several Bluetooth devices -- I'm using one right now, in fact (we're cranking Willie Nelson on the hangar stereo, connected via Bluetooth) -- and they ALL effortlessly and automatically connect to my Nexus 7.

EXCEPT the GDL-39. I have had difficulty with the GDL-39 not AUTOMATICALLY connecting to my Nexus 7 via Bluetooth. This doesn't mean I can't connect, it just means that I have to go through the whole "scan for available devices" process -- which is a PIA but not hard.

I think Garmin is hosing you. I'm guessing that there is something in their firmware that is not copacetic. Or maybe, worse, you've got a problem with your GDL-39. Or both.

Can you connect your Nexus 7 to other Bluetooth devices? Gotta start by eliminating some variables.
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Old January 29th, 2013, 09:59 AM   #14
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Re: Nexus 7 & Garmin GDL39 - bluetooth issues

I too have had strangle issues with bluetooth after upgrading to Android 4.2 (and 4.2.1). I've since downgraded to CM10 based on Android 4.1.2. Google introduced a "new" bluetooth stack with Jellybean 4.2. Here is a quote from their developers website...

http://developer.android.com/about/v...elly-bean.html

Quote:
New Bluetooth stack

Android 4.2 introduces a new Bluetooth stack optimized for use with Android devices. The new Bluetooth stack developed in collaboration between Google and Broadcom replaces the stack based on BlueZ and provides improved compatibility and reliability.
==
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Old January 29th, 2013, 03:28 PM   #15
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Re: Nexus 7 & Garmin GDL39 - bluetooth issues

Latest from Garmin. Apparently it's a somewhat known issue. The developers were aware; the general aviation portables customer service personnel were not.
J
Quote:
Hello John,

I was searching the Google Android forums about the known Bluetooth issues and there is one other thing to try. Apparently if you are using Bluetooth, they recommend that you go into the settings of the device and turn off the wifi before pairing the device. Apparently having the wifi on while connection via bluetooth is a know issue and maybe that will help keep the GDL-39 connected.

To get the GDL-39 replaced it that does not work, just file a ticket with Garmin Product Support through the Garmin website. I am with the Digital Cyclone division and only deal with applications.


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Old January 30th, 2013, 12:44 PM   #16
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Quote:
Originally Posted by ChesapeakeJohnny View Post
Latest from Garmin. Apparently it's a somewhat known issue. The developers were aware; the general aviation portables customer service personnel were not.
J




Another thing to try -- reboot your Nexus 7 before flight. This ensures a clean run for Garmin Pilot. If you're like me, you prolly leave it on for weeks, and have a dozen apps running in the background.

I've rebooted before my last few flights, and have had no issues.
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Old January 31st, 2013, 11:20 AM
Posted in reply to Jay Honeck's post starting "Another thing to try -- reboot your..."
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Re: Nexus 7 & Garmin GDL39 - bluetooth issues

I'll try (again). Did that last flight and no improvement. My GDL39 is on its way back to Garmin for a trade, so we'll see if the new unit has any issues.
Thanks,
J

Quote:
Originally Posted by Jay Honeck View Post
Another thing to try -- reboot your Nexus 7 before flight. This ensures a clean run for Garmin Pilot. If you're like me, you prolly leave it on for weeks, and have a dozen apps running in the background.

I've rebooted before my last few flights, and have had no issues.
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Old January 31st, 2013, 12:50 PM   #18
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Quote:
Originally Posted by ChesapeakeJohnny View Post
I'll try (again). Did that last flight and no improvement. My GDL39 is on its way back to Garmin for a trade, so we'll see if the new unit has any issues.
Thanks,
J
Man, that sucks. I got my GDL-39 at OSH, on the second day (I think) they were available. No issues yet! (Knocking on wood.)
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Old January 31st, 2013, 02:53 PM   #19
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Re: Nexus 7 & Garmin GDL39 - bluetooth issues

Interestingly, mine has been fine since I killed a couple Bluetooth services(both the GDL39 and my Bluetooth keyboard) without any reboots. I'll try and check tonight and see if it gets worse again when I reboot it. And figure out what services I killed.
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Old February 2nd, 2013, 07:57 PM   #20
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We flew 1.5 hours with the new update today. It was rock-solid, with MUCH better Bluetooth connectivity. For the first time the Nexus 7 connected to the GDL-39 automatically -- no futzing around at all, just turn both units on and go fly.

There was one 15-second period, about 20 minutes into the flight, when the numbers stopped changing and I thought it might be locked up, but it came back after apparently losing GPS signal for that time.

This seems to happen on every flight, so I think Garmin still has a few bugs to work out (this never happens using the N7's internal GPS) but Pilot and the GDL-39 otherwise performed flawlessly, showing weather, traffic, fuel prices, etc.
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Old February 5th, 2013, 01:16 AM   #21
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One odd thing of note: Since the update we have only seen traffic displayed once, in about 6 hours of flying.

We flew right over the top of San Antonio's busy airspace twice in two days, and saw NO ADS-B traffic? This seems unlikely. Methinks there's a new glitch in the connection to the GDL-39, but how do you prove a negative when so few people have ADS-B squitters? Everything indicated that we were properly connected via Bluetooth.
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Old February 5th, 2013, 09:48 AM
Posted in reply to Jay Honeck's post starting "One odd thing of note: Since the update..."
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Re: Nexus 7 & Garmin GDL39 - bluetooth issues

Jay,

You could also try the GDL-39 Utility from the Play Store as a debug tool. It lists the number of Targets being seen by the ADS/B unit. Not a solution, but definitely a debug tool.



==
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Old February 5th, 2013, 10:14 AM   #23
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Re: Nexus 7 & Garmin GDL39 - bluetooth issues

Garmin Pilot has the same info as the GDL 39 Utility under the "GDL 39" tab in settings.

Jay - is it possible that the altitude filter was set wrong?
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Old February 5th, 2013, 10:17 AM   #24
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Quote:
Originally Posted by ryarya View Post
Garmin Pilot has the same info as the GDL 39 Utility under the "GDL 39" tab in settings.

Jay - is it possible that the altitude filter was set wrong?
Dunno -- I will check next flight.

I have not changed them. Hell, I didn't know they COULD be changed? Where is that parameter set?
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Old February 7th, 2013, 07:33 AM
Posted in reply to Jay Honeck's post starting "Dunno -- I will check next flight. I..."
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Re: Nexus 7 & Garmin GDL39 - bluetooth issues

New GDL39 received less than a week after sending my earlier unit in to Garmin. They also sent an additional 12v power plug for home programming purposes, since my first one for the plane & the existing 496 has now been hardwired.

Ground tests show that bluetooth connection is immediate and steady, and reacquires without incidence regardless of which unit turned off or on first.

Don't know if it was the new update or the new GDL39, or both. But, Garmin stepped up and seemingly fixed it in a timely manner so I am pleased.

I'll let folks know if I have any issues with traffic like Jay is experiencing.
Thanks,
John
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