Bluetooth PAN Tethering fix

ddv2005 · Sep 21, 2011

Hi,

Bluetooth PAN Tethering on Motorola Bionic/Droid 3 has 2 bugs:
1. DNSMASQ can't start because does not understand IPv6 addresses as DNS but android write it to the btip.conf
2. Bionic does not use STDIN DNSMASQ control (it write DNS option to btip.conf). But DNSMASQ still listen STDIN and try to execute empty commands and it use 100% CPU.

I made new dnsmasq that fix both problems. You can put it to /system/bin/dnsmasq and use Bluetooth PAN Tethering.

Backup original copy of dnsmasq by

Code:

adb pull /system/bin/dnsmasq

Make sure that you make /system writable and then copy new dnsmasq

Code:

adb push dnsmasq /data/local/
adb shell
$su -
#cp /data/local/dnsmasq /system/bin/dnsmasq
#rm /data/local/dnsmasq

Known issues:
1. some times after disconnect you need to restart (disable->enable) bluetooth on Bionic to connect again.
2. If you used Mobile hotspot then you need to reboot your phone to use PAN service again (for some reason NAT does not work in PAN mode after using mobile hotspot).

Dmitry

PS. I guess that Bluetooth tethering is not detectable yet.

Update 10/14/2011
I have updated exe and patch to fix Mobile Hotspot mode.

Brenardo · Sep 21, 2011

This is extremely good work my friend. I hope you continue to make leaps snd bounds on the bionic!

I would also like to know if this wwould work for tethering my Xoom?

ddv2005 · Sep 21, 2011

Brenardo said:
I would also like to know if this wwould work for tethering my Xoom?

It should to work. I tried with ASUS eee Pad and it is work fine.

elislurry · Sep 22, 2011

Does PAN tethering allow you to use any app that requires internet? I know DUN will only allow a few apps (Browser, Mail, Maps) to work.

ddv2005 · Sep 22, 2011

I just checked IM+ on my ASUS eee Pad and everything work fine.

elislurry · Sep 22, 2011

Nice! Just got it working with my Transformer. I am seeing pretty slow speeds though (about .8mb down and 1.5mb up) while if I do a speed test on my phone I get 6mb down and about 7mb up. Are you guys seeing these slow speeds as well?

ddv2005 · Sep 22, 2011

elislurry said:
Nice! Just got it working with my Transformer. I am seeing pretty slow speeds though (about .8mb down and 1.5mb up) while if I do a speed test on my phone I get 6mb down and about 7mb up. Are you guys seeing these slow speeds as well?

I guess it is maximum Bluetooth connection speed.

elislurry · Sep 22, 2011

ddv2005 said:
I guess it is maximum Bluetooth connection speed.

Hmm it should be able to do at least 2.1mb/sec I will look into it and see what I find.

ddv2005 · Sep 22, 2011

elislurry said:
Hmm it should be able to do at least 2.1mb/sec

2.1mb it is theoretical maximum. Did you ever try to get 300Mbit/s from WiFi N? You event can't get WiFI G speed (54Mbit/s) because it is theoretical maximum that you never reach in real world. Same with bluetooth + network delay reduce TCP throughput.

mx5er · Sep 29, 2011

Amazing fix. Thank u very much. This works perfectly on my ipad2

benlane · Sep 30, 2011

Quick question

First off - thank you.

Next my question. I am using Root Explorerr. I made my back of the original file. I copied the contents of the zip file to system\bin directory. What should I do with the txt file?

Thanks for the help.

ddv2005 · Sep 30, 2011

benlane said:
What should I do with the txt file?

Nothing. Text file is the source code patch for developers only who want compile it.

benlane · Sep 30, 2011

Again Thank

thanks for the great response and the effort.

mantispid · Oct 14, 2011

Just FYI, if you use this method, you will kill your ability to use the built-in hotspot wifi tether. Be sure to save the old file, and revert to it should you decide you want to use the hotspot app.

ddv2005 · Oct 15, 2011

mantispid said:
Just FYI, if you use this method, you will kill your ability to use the built-in hotspot wifi tether. Be sure to save the old file, and revert to it should you decide you want to use the hotspot app.

I have updated exe (in first post) to support build-in hotspot wifi tether. But for some reason NAT does not work in Bluetooth PAN mode after using mobile hotspot. To restore NAT in Bluetooth PAN mode you need to reboot the phone.

Dmitry

quasidynamic · Oct 31, 2011

Great!

The patched file works a treat! PAN is back! Thanks so much!

for the less experienced folks trying to get this to work, here's a couple detailed steps not in the original post:

1. when issuing the "su" command for the first time, look at the the device screen as it will prompt you to allow the action to complete. Make sure to allow it otherwise you cannot proceed with required "su" commands.

2. before copying the file to /system/bin, remount the /system mount read-write like this:
mount -o rw,remount -t ext3 /dev/block/system /system

(you can check your mount points first using "mount" in case they vary from the above)

Thanks again!

quasidynamic

0mie · Nov 1, 2011

Maybe I am missing something simple, but I just used root explorer to move over the file and change permission, rebooted and it didn't work

XXX
X_X
X_X

Those are the correct permission for the file, right?

Jiggity Janx · Feb 13, 2012

I'm sure Motorola thanked you for the Bluetooth PAN tethering fix that showed up in .902.

In my recent donation to the wifi tether dev I noted the .902 Bionic PAN fix and requested he think about adding bluetooth tethering in for the Bionic.

spencerjang · Nov 5, 2014

Hello elislurry.

I was wondering if you could help me out with understanding the BT tethering operation in perspective of Android system?
For instance, Wi-Fi tethering operates just like the fixed AP, but in case of BT, its not used much as a tethering operation but more focused to communication to accessories, right?
Do you have any ideas on how this works on BT?

Thanks in advance!

Bluetooth PAN Tethering fix

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