Forums - MAx BLE Connections supported by QCA4020

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MAx BLE Connections supported by QCA4020
yerasiprathyusha
Join Date: 3 Sep 18
Posts: 7
Posted: Wed, 2018-10-24 21:48
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Hi,

We are trying to connect to 5 pherepherials (Bulbs)  from QCA4020 as master. But i am able to maintain only 4 active connections at a given point of time. Is there any limitation on number of active BLE connections??

Awaiting for response.

Thank you,

Y. Prathyusha.

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Re: MAx BLE Connections supported by QCA4020 — Best Answer
c_rpedad
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Join Date: 18 Jun 18
Location: San Jose
Posts: 317
Posted: Thu, 2018-10-25 12:35
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The allowed maximum number of simultaneous BLE connections is 4 by default. The maximum value is 10.
The value can be configured in @target\quartz\nvm\config\2.0\4020\CDB\QCA4020_2p0.nvm under NVM Tag 1.

Please refer to section "3.6.1.1 BLE size parameters" of document "QCA402x (CDB2x)Programmers Guide 80-YA121-142" about NVM configuration for Maximum simultaneous BLE connections.
The parameter is about the number of simultaneous connection and it is to restrict memory usage for multiple connections.

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Re: MAx BLE Connections supported by QCA4020
yerasiprathyusha
Join Date: 3 Sep 18
Posts: 7
Posted: Thu, 2018-10-25 22:31
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Hi Raja,

Thanks, it worked.

We were able to connect to 5 devices a couple of times but now we have a new issue:

We receive QAPI_BLE_HCI_ERROR_CODE_UNACCEPTABLE_CONNECTION_INTERVAL after responding to connection parameters update request. Can you please help us?

We did not see this issue when max_connections was set to 4 in NVM configuration file

Here is the log for the same:

Request f rom peripheral:
BLE: etLE_Connection_Parameter_Update_Request with size 14.
BLE:    BD_ADDR:                     0xACA74B18ACE6
BLE:    Connection Interval Minimum: 20
BLE:    Connection Interval Maximum: 40
BLE:    Slave Latency:               0
BLE:    Supervision Timeout:         6000
 

Response from peripheral after update was sent from QCA4020:

BLE: etLE_Connection_Parameter_Updated with size 14.
BLE:    BD_ADDR:             0xACA74B18ACE6
BLE:    Status:              59 (QAPI_BLE_HCI_ERROR_CODE_UNACCEPTABLE_CONNECTION_INTERVAL)
BLE:    Connection Interval: 0
BLE:    Slave Latency:       0
BLE:    Supervision Timeout: 0

Thanks a lot,

Prathyusha

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Re: MAx BLE Connections supported by QCA4020
jaydenk
Join Date: 21 Jun 18
Posts: 64
Posted: Sat, 2018-10-27 14:28
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Hi Prathyusha,

The new error seems happening because there is no slot to align the new connection when you already have several connections.

Did you check the connection interval of the existing 4 connections?

If the existing 4 connection have short connection interval, this error can happen.

Thanks
BR,
Jayden

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Re: MAx BLE Connections supported by QCA4020
yerasiprathyusha
Join Date: 3 Sep 18
Posts: 7
Posted: Mon, 2018-10-29 19:53
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Hi,

Thank you for your support.

As the bulbs (pheripherals)  are requesting for connecting intervel from 20 - 40 milli sec. Changed connection time from 20 to 40 millisec. Now the application is working fine.

Sometime we experienced hang issue. Please help regarding this.

Thank you,

Y. Prathyusha.

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Re: MAx BLE Connections supported by QCA4020
jaydenk
Join Date: 21 Jun 18
Posts: 64
Posted: Mon, 2018-10-29 23:15
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Hi yerasiprathyusha,

For debugging hang issue, you may need JTAG debug in gdb session.

Please refer programmer and dev kit document.

Thanks
BR,
Jayden

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Re: MAx BLE Connections supported by QCA4020
lap.dang
Join Date: 24 Oct 18
Posts: 14
Posted: Tue, 2020-03-31 23:55
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Hi guys,

I have SDK and the hardware of QCA4020. Current, I can connect with 4 sensor at the same time.

Follow the document, I modified the file .nvm to connect more than 4 sensor (try with value 07):

Step 1: Modified in file target\quartz\nvm\config\2.0\4020\CDB\QCA4020_2p0.nvm
[Tag0]
TagNum = 1
TagLength = 13
TagValue = 51 00 72 06 [07] 10 10 14 14 10 04 FB 00
Step 2: Rebuild the SDK, see in the file target\quartz\demo\QCLI_demo\src\export\UsrEDL.c had updated
unsigned char UsrEDLFileData[] = {
   0x02, 0x99, 0x02, 0x00,
   0x01, 0x00, 0x0D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x51, 0x00, 0x72, 0x06, [0x07], 0x10, 0x10, 0x14, 0x14, 0x10, 0x04, 0xFB, 0x00,
   0x03, 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x29, 0xF9, 0xE4, 0xF9, 0x2F, 0xFB, 0xFB, 0xFB, 0x34, 0xFD, 0x6F, 0xFE, 0x40, 0xFF, 0x70, 0x00, 0x8A, 0x01, 0x73, 0x02, 0x26, 0x04, 0x4A, 0x05, 0x70, 0x06, 0x99, 0x07, 0xB3, 0x08, 0xBD, 0x09,
   0x05, 0x00, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 
But I still can not connect with 5th sensor BLE. Can you give me any advice? Thank you so much.
Regards,
Lap
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Re: MAx BLE Connections supported by QCA4020
lap.dang
Join Date: 24 Oct 18
Posts: 14
Posted: Sun, 2020-04-26 20:13
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Hi All,

The problem was reolved. We need change the interval_time min and max for create and hold the connection.

Thank you.

Lap

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