Nordic controller is not receveing the ble disconnect event from the ble android application som times if i kill the app?reproducability 1 out of 20.

RE: Nordic controller is not receveing the ble disconnect event from the ble android application som times if i kill the app?reproducability 1 out of 20.

Kenneth — Thu, 22 Mar 2018 08:56:13 GMT

First step would be to setup an app_timer that repeatedly toggle an GPIO, to verify you have implemented app_timer correctly, does this work?

Next step would be to start the app_timer on BLE_GAP_EVT_CONNECTED event, and then if there is no PM_EVT_CONN_SEC_SUCCEEDED in pm_evt_handler() within lets say 5seconds, then the app_timer timeout handler can execute sd_ble_gap_disconnect() to force a disconnect.

You can stop the app_timer on PM_EVT_CONN_SEC_SUCCEEDED and BLE_GAP_EVT_DISCONNECTED events, to make sure the timeout handler does not execute a disconnect if the link is securely encrypted or if the link is already disconnected.

RE: Nordic controller is not receveing the ble disconnect event from the ble android application som times if i kill the app?reproducability 1 out of 20.

ramakrishna — Wed, 21 Mar 2018 06:34:38 GMT

hi tank you for the support,

I have implemented the timer and it is working fine

now my doubt is why time out is not coming if we are not exachanging any data for more than 4 sec? can u please explain?

RE: Nordic controller is not receveing the ble disconnect event from the ble android application som times if i kill the app?reproducability 1 out of 20.

Kenneth — Mon, 19 Mar 2018 13:16:01 GMT

Hi, you can always add an application timer that is started on connection event, and then the application timer can disconnect the link, if the link has not successfully encrypted after for instance a few seconds.

RE: Nordic controller is not receveing the ble disconnect event from the ble android application som times if i kill the app?reproducability 1 out of 20.

Turbo J — Fri, 16 Mar 2018 12:32:59 GMT

You could try using high connection interval values, which would slow down everything.

RE: Nordic controller is not receveing the ble disconnect event from the ble android application som times if i kill the app?reproducability 1 out of 20.

ramakrishna — Fri, 16 Mar 2018 11:32:14 GMT

how can i delay the link encrption acknowledgement to the android during the connection establishment so that i can create a issue?

RE: Nordic controller is not receveing the ble disconnect event from the ble android application som times if i kill the app?reproducability 1 out of 20.

ramakrishna — Fri, 16 Mar 2018 05:09:13 GMT

Hi Kenneth,I dont have a sniffer i need to buy that...

from ble snooping log it is going through the fallowing sequence

1.scanning

2.connect

3.paramers update

4encryption

5data exachange

after central has sent connect nordic board leds is on and after that paramter updatation is done no if we kill the blue tooth application at encryption stage in android (some times android is not sending ble disconnect and so is nordic not getting disconnected) and no data tranfer was taking place.

It is is connected state till we disable the bluetooth in the andorid.

Q 1)at this stage why IN NORDIC time out was not coming even if we are not exchanging any data and getting disconnected.

Q 2)How to disconect the nordic if encryption was nor successfull and if it is there why it is not happening

i am not changing any thing in the device manager code

RE: Nordic controller is not receveing the ble disconnect event from the ble android application som times if i kill the app?reproducability 1 out of 20.

Kenneth — Wed, 14 Mar 2018 10:07:50 GMT

Please create an on-air sniffer log.

RE: Nordic controller is not receveing the ble disconnect event from the ble android application som times if i kill the app?reproducability 1 out of 20.

ramakrishna — Wed, 14 Mar 2018 09:48:17 GMT

i am using one to one connection only.

RE: Nordic controller is not receveing the ble disconnect event from the ble android application som times if i kill the app?reproducability 1 out of 20.

Kenneth — Wed, 14 Mar 2018 09:45:10 GMT

I suggest you make an on-air nRF sniffer log:
http://www.nordicsemi.com/eng/Products/Bluetooth-low-energy/nRF-Sniffer/(language)/eng-GB

That is the only way to check what is actually going on.

RE: Nordic controller is not receveing the ble disconnect event from the ble android application som times if i kill the app?reproducability 1 out of 20.

ramakrishna — Wed, 14 Mar 2018 05:16:31 GMT

hi,this is the total snooping file i got by opening and killing the applicationdevzone.nordicsemi.com/.../hci_5F00_snoop20180313011859.cfa

please go through it and if possible try to give your observasions

RE: Nordic controller is not receveing the ble disconnect event from the ble android application som times if i kill the app?reproducability 1 out of 20.

ramakrishna — Wed, 14 Mar 2018 05:08:25 GMT

hi Kenneth,in my case nordic board is not disconnecting at all,

i am sharing u some screen shots that i got by using ble snooping in android .

that time gab shows that ble application was closed and reopened before that case we are getting ble disconnect but in non working case i have not received it.

RE: Nordic controller is not receveing the ble disconnect event from the ble android application som times if i kill the app?reproducability 1 out of 20.

Kenneth — Tue, 13 Mar 2018 13:00:54 GMT

Hi, the intention of the supervisor timeout is to handle cases like this, to ensure that the link is eventually disconnected if for instance the device and peer are out or range or battery is empty. The supervisor timeout is part of the connection request packet and can be updated using connection parameter update request during link is active. In this case it seems the android in some cases does not send a disconnect packet, thereby the peer will wait until supervisor timeout before link is disconnected.

RE: Nordic controller is not receveing the ble disconnect event from the ble android application som times if i kill the app?reproducability 1 out of 20.

ramakrishna — Tue, 13 Mar 2018 05:49:31 GMT

In my case nordic was in connected state even if app was killed reason is i have not received a ble_disconnect event. and now if off the bluetooth only then only we are able to connect again to the tablet.

I am using hrs rtos code.

why the nordic is not disconnecting even they are not exchanging the data means even after after time out of 4 sec.

what exactly the role of the supervisor time out?

RE: Nordic controller is not receveing the ble disconnect event from the ble android application som times if i kill the app?reproducability 1 out of 20.

Kenneth — Mon, 12 Mar 2018 14:04:43 GMT

Then the issues is likely a issue with Android, not much the nRF52832 softdevice can do if it doesn't receive a disconnect packet.

RE: Nordic controller is not receveing the ble disconnect event from the ble android application som times if i kill the app?reproducability 1 out of 20.

ramakrishna — Mon, 12 Mar 2018 14:01:22 GMT

android is not sending disconnect .here in this case i have verified with bluetooth snooping log

RE: Nordic controller is not receveing the ble disconnect event from the ble android application som times if i kill the app?reproducability 1 out of 20.

Kenneth — Mon, 12 Mar 2018 12:29:29 GMT

When a device disconnect the link, there will be disconnect packet sent from the device to the peer, and the peer will acknowledge this packet, now the link is considered disconnected on both sides of the link.

If there is noise in the environment, the acknowledge from the peer may be lost, in such case only the peer will disconnect, while the device will remain in a connection until supervisor timeout occurs. This is according to Bluetooth spec.