CC2640R2F: Mobile app getting disconnected frequently

Suganya A M

Part Number: CC2640R2F

Hi all

This is continuation of the post -

Our custom android app or any 3rd party app is facing frequent disconnection issue.

We disabled DLE feature and reduced connection interval also.
Though this solved our issue, but in long run, we are still facing disconnection issue with few mobiles.

Inconsistently, issue is seen with Nexus tablet running Android version 7.1.1 and Redmi note running Android version 7.0 as of now
We are sending notifications to mobile and randomly after some "n"th packet, mobile app is getting disconnected and connected automatically
When we checked the wireshark capture, we found that after the last notification packet being sent to mobile, master is sending connection event but slave is not responding for it and after 20s of supervision timeout, app is getting disconnected automatically

We tried to reduce connection interval to 7.5ms in peripheral side but still the issue was seen
Here connection interval is getting updated to 48.75ms after conn. update parameter req.

Why the slave didn't respond after sometime is unknown?
What are the possible scenarios that slave wouldn't respond to master connection event?

Note - Using BLE BLUGIGA dongle, python script to get notification is working in long run always

Attaching wireshark capture of disconnected issue. Please rename .ppt to .pcapng and open using wireshark

Regards,
Suganya

6170.nexus_tablet_disconnected - Copy.ppt

over 7 years ago

0 Zahid Haq over 7 years ago

TI__Mastermind 25035 points

Hi,

Is it possible you can send us a over the air sniffer capture? Do all android phones show this behavior? Is a lot of data being processed/sent over the air? For example, does it disconnect if just sending empty packets at 1 second connection interval? Which version of the SDK are you using?

Best wishes

0 Suganya A M over 7 years ago in reply to Zahid Haq

Intellectual 480 points

I have already attached the capture in previous comment. Is that the capture you requested?

Most of the phone we tested in long run of automation shows this behavior

We are using simplelink_cc2640r2_sdk_1_35_00_33 SDK

We are sending around 17 bytes of notification data once every 768ms where connection interval has been set as 500ms in slave side

Tried with 7.5ms also where after negotiation it takes 48.75ms as interval

But still we are facing issue

I will try sending empty packet for 1sec interval.

- Suganya

0 Suganya A M over 7 years ago in reply to Zahid Haq

Intellectual 480 points

Can anyone please reply to this post?

We are facing this issue in most of the mobiles.

We need urgent solution for this..

- Suganya

0 Zahid Haq over 7 years ago in reply to Suganya A M

TI__Mastermind 25035 points

Hi,

Are you able to reproduce this using two CC2640R2F LaunchPads so we can reproduce this on our side?

Best wishes

0 Suganya A M over 7 years ago in reply to Zahid Haq

Intellectual 480 points

We dont have CC2640r2 lauchpad available here.

We tried sending empty packets also but still issue was seen

Only in debugging mode, we didn't observe this issue. We could see notification packet number more than 4000

- Suganya

0 Suganya A M over 7 years ago in reply to Suganya A M

Intellectual 480 points

Hi
From simple_peripheral example we developed our project and for notification we are using this api
SimpleProfile_SetParameter
In case of disconnection issue, we can see return status as blePending
Any idea why we get like this?

0 Zahid Haq over 7 years ago in reply to Suganya A M

TI__Mastermind 25035 points

Hi,

Can you provide a packet sniffer capture as described in this guide so we can further analyze the disconnection issue:

Best wishes

0 Suganya A M over 7 years ago in reply to Zahid Haq

Intellectual 480 points

Hi

During this issue, we receive status as "blePending" for notification API return status.
How to resolve this state?
We could see that heap size, stack size are not overflowing also.
Is there any possibility to clear the messages in queue or to move BLE to active?

- Suganya