a little timeout between closing and new connection

[DmitrySol]

Hi

We use nrf52832 as central.

Phone is connected to it as peripheral.

If phone has disconnected and is connecting after that, connection is not established.

If time between disconnecting and new connecting is more (If go out for some time or switch off bluetooth on phone for some time) - connection will be established successfuly.

Connected has closed by reason 0x08

<info> app: Scanning start
<info> app: BLE_GAP_EVT_ADV_REPORT peer_id=0x0
<info> app: Start_connection for Bonded peer
<info> app: scan_evt_handler id = 6
<info> app: Connecting to target 0x4212F3DE9B61
<info> peer_manager_handler: Peer data updated in flash: peer_id: 0, data_id: Peer rank, action: Update, no chan
<info> app: Scanning start
<info> app: BLE_GAP_EVT_DISCONNECTED: 0 , reason=0x8
<info> app: Scanning start

It has happen periodically.

Sometimes other reasons are occured.

#define BLE_HCI_LOCAL_HOST_TERMINATED_CONNECTION 0x16 /**< Local Host Terminated Connection. */

#define BLE_HCI_STATUS_CODE_LMP_RESPONSE_TIMEOUT 0x22 /**< LMP Response Timeout. */

It seems to me that some timeout settings have effect.

Please advice which settings could be changed to solve this issue.

Thanks

[Mttrinh]

Hi,

The following information will be helpful:

Which SDK and Softdevice version are you using?

Are you using a DK or a custom board?

Which example are you running? Have you done any modifications to the example?

Which Phone are you using?

Which App are you using to connect the phone as peripheral? Are you using our nRF Connect app?

[DmitrySol]

Hi

NRF52832 is used as central for connecting with phones as peripheral.
NUS service is used. Lesc is used too.

SDK 17.0.0
SoftDevice S132 V7.0.1

Board is our.

Application for phone is our.

It seems to me now that problem is in our application for phone.

Because restarting of central doesn't help.
Removal of phone doesn't help too (In previous message i was wrong)

Connect established after off/on bluetooth on phone only.

I'll try look in the application now.

Sorry for worry.

Thanks

[DmitrySol]

Software re enable of bluetooth on phone helps to reestablish good connection.

by using:
bluetoothAdapter.disable();
bluetoothAdapter.enable();

But It is not good idea.
All bluetooth connections will be reset. :(
(for example audio over bluetooth will be switched off)

[Mttrinh]

Hi,

Sorry for the late response. 

I think this might be related to caching on the phone. Which phone are you using? Android or iOS?

It seems to work fine except for when you use it in the car. Is it a lot other wireless devices(Or something else) nearby that might disrupt the connection?

[DmitrySol]

The issue was caused by not optimised working of spi slave.
Host mcu had large intervals between bytes.
After optimising spi master the issue was disappeared.
It is strange enough. But now it works correctly.

Very rarely I observe another problem.
Playing audio in the car through the same phone over bluetooth is breaking.
Audio plays a litle time, than pause a few seconds is followed. and it is repeated.

[Mttrinh]

Glad you worked it out :) 

DmitrySol said:

Very rarely I observe another problem.
Playing audio in the car through the same phone over bluetooth is breaking.
Audio plays a litle time, than pause a few seconds is followed. and it is repeated.

Is this related to your original issue? If not, could you create a new ticket for this.

[DmitrySol]

ok.

Thanks!