CC2564: Android connectivity issues

Parijat Gupta

Part Number: CC2564

Hello,

We've been using CC2564B for dual BLE + A2DP sink application using Bluetopia stack, and a critical problem we're running into is that we can't connect to it from most Android devices.

(We can connect to it reliably and consistently from iOS devices.)

On debugging using HCI sniffer tool on the Android device and parsing the log over Wireshark, we can see that the pairing actually happens, but a missing L2CAP packet prevents SDP service discovery -- so it does not go through the connection process.

Interestingly, for some Android devices, if we first (somehow) pair it by either connecting to it over BLE, etc., and then try to connect, those devices can connect. Unfortunately, that's not an acceptable user experience.

Please let us know if there are known issues with connecting to Android devices and/or necessary steps for a software fix/workaround to be able to go through pairing + connection in one step.

(Our product does not have either display or keypad for entering passkey, etc. -- so, that's a constraint.)

Thanks.

over 8 years ago

0 S over 8 years ago

TI__Mastermind 35795 points

Hi,
Your query has been assigned to relevant engineer. We will get back to you shortly.

Thanks
Saurabh

0 Hari Nagalla over 8 years ago in reply to S

TI__Mastermind 27090 points

Yes, there is a known bug with newer Android release. The solution is to use advertise (BLE) with a private (you can make it fixed) address, so that the Android device sends BLE connect request correctly. This solution does not create any problems for iOs devices either..

Thanks

0 Parijat Gupta over 8 years ago in reply to Hari Nagalla

Prodigy 20 points

Hari,

The issue is not with connecting over BLE. It connects fine over BLE.

The issue is with connecting over classic BT (A2DP and HFP).

Please help.

Thanks,

Parijat

0 Hari Nagalla over 8 years ago in reply to Parijat Gupta

TI__Mastermind 27090 points

Can, you describe the scenario of the failure? Is it, you have an active BLE connection with notifications/indications and then you attempt a classic BT connection, which randomly fails? If, you have a BT FW log with HCI events, please send it across? If, the BLE traffic is much, and as the radio is shared between BLE and BT, there may be corner case instances of connection failures.. Again, we need to review the FW and Sniffer logs to understand it..

Thanks

0 Gavin Jiang over 8 years ago in reply to Hari Nagalla

TI__Intellectual 1470 points

Hi Hari Nagalla,
"Yes, there is a known bug with newer Android release. "
Could you please tell me details of this bug? Which version Android has this bug? thanks!

0 Hari Nagalla over 8 years ago in reply to Gavin Jiang

TI__Mastermind 27090 points

The problem observed is as below :
Dual mode devices using the same public address for classic BT and BLE for advertising are likely to fail, as Android7 seems to attempt classic BT connection, after a BLE advertisement. The fix is to use a different private BD address for BLE, so that Android uses it for LE_connection, without confusing with the classic BT connection.

Thanks

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CC2564: Android connectivity issues