MITM Bonding issue with Android L

RE: MITM Bonding issue with Android L

Now — Tue, 07 Jul 2015 03:33:31 GMT

okay, thanks.

RE: MITM Bonding issue with Android L

Hung Bui — Mon, 06 Jul 2015 07:53:20 GMT

@Now: I would suggest to close this case and continue on the other one.

RE: MITM Bonding issue with Android L

Now — Wed, 01 Jul 2015 11:12:36 GMT

Hi Hung, 'Cause Nexus 7 II uses irk not bt address, so we only saved irk. I used two android devices to do the test again. And the link is : devzone.nordicsemi.com/.../

thanks for your resply again.

===================================================

we have two devices using android 5.0 have this issue.

bonding to s110, irk_counter=1; s110 uses whitelist advertising. android 5.0 device can reconnect to s110.
android 5.0 device delete bonding info, and rebonding to s110, irk_counter=2; s110 uses whitelist advertising. android 5.0 device cannot reconnect to s110.
s110 uses advertising without whitelist, android 5.0 device can reconnect to s110.

iPhone5s and android 4.4 device can do it right. Anyone have similar issue like me? thanks.

S110 + SDKv6.1 + SDv7.1

RE: MITM Bonding issue with Android L

Hung Bui — Wed, 01 Jul 2015 11:03:39 GMT

@Now: There is something that I'm confusing about. You mentioned that "it's okay for nexus 7 to reconnect while using whitelist advertising", but on the last comment you said the BT address of Nexus 7 is not saved in the whitelist.

If it's not saved how could you reconect with whitelist on ?

I'm testing here with my Nexus 7 with the proximity example in SDK v8.1 on nRFMaster Control panel app. It works fine exect for only one issue that it won't disconnect when click disconnect button after bonding. I have to turn off Bluetooth to do so. Delete bond on the tablet, won't stop it from re-connecting (and then initiate another bond).

RE: MITM Bonding issue with Android L

Now — Wed, 01 Jul 2015 03:29:27 GMT

Hi Hung, as you said, the bt address of nexus 7 II is not saved in the whitelist!! But the BT address of HTC M7 (with android 4.4) can be saved.

RE: MITM Bonding issue with Android L

Now — Wed, 01 Jul 2015 02:36:11 GMT

we think nexus 7 with android 5.1.x may not handle whitelist advertising correctly, since it enters connected state and s110 is still advertising in disconnected state.

RE: MITM Bonding issue with Android L

Now — Wed, 01 Jul 2015 02:14:18 GMT

Hi Hung, thanks for your suggestion. We've clear the database while doing the test, and we'll check if bt address saved in whitelist. When Nexus 7 fails to reconnect, it can find nrf51822 on its scan list and press connect button.

BTW we find a weird behavior:

if we clear our nrf51822 database and use nexus 7 to do its first bonding. it's okay for nexus 7 to reconnect while using whitelist advertising.
if we delete bonded data in nexus 7, and then re-bonding again. it can't reconnect while using whitelist advertising. The weird thing is nexus 7 can reconnect if we use advertising without whitelist.

looks like data mismatch when we use whitelist advertising.

RE: MITM Bonding issue with Android L

Hung Bui — Tue, 30 Jun 2015 08:21:06 GMT

@Now: If you are using SDK v6.1 you don't have to apply the patch in the blog post.

Have you tried the SDK proximity example to see if the Nexus 7 can reconnect to the board ? You can also check and make sure the device is not full of bonded device and couldn't add your device in the database ? Could you check if the address of your tablet is in the list of "whitelist" ? When mentioned Nexus 7 can't connect to the device, you meant you couldn't find it in the list on the Nexus 7 or you found but when click connect nothing happened ?

RE: MITM Bonding issue with Android L

Now — Tue, 30 Jun 2015 01:23:21 GMT

already used the patch for Q1/Q2/Q5 on my SDK6.1 devzone.nordicsemi.com/.../

but android L device still cannot reconnect if using whitelist advertising