BLE connection issue

[SciTER Development Team]

BLE device(having nRF52832 chip) can not connect with mobile phone. for more information i have attach nRF Sniffer Log.

SDK: 14.2

Stack: S332_05_00_00  Multi protocol (BLE + ANT)

Mobile phone device: iPhone x(ios version 12.2), iPhone 6(ios version 12.2), iPhone 5 (ios version 10.3.3)

According to log, we can say that slave not respond to master for LL_VERSION_IND. Is there anything wrong with Master or Slave.

please give appropriate solution.

[Himansu Donga]

FWLogMultiConnectionByPhone1.pcapng

Log8.pcapng

Hi,

This issue also observe in Android Galaxy S10 phone also.

When we use SDK12 Firmware it is working OK. After Upgrading to SDK14 than we face this issue.

SDK: 14

Softdevice: S332 (5.0.0)

Chip Set: nRF52832

Please check attached sniffer log.

Regards,

Himansu Donga

[Kenneth]

Hi,

In general there may be two reasons why the peripheral is not responding to the CONNECT_REQ:

1. The peripheral may be using whitelist, and thereby will not allow anyone not in the whitelist to connect (if whitelist is the reason, then that filter 100% of CONNECT_REQ from other peers).

2. There may be noise in the environment that prevent the CONNECT_REQ to be received due to interference (this may happen <5% of the cases).

Let me know if this may explain what you see. If this doesn't explain your observation, then can you please specify where I should look in your log files (e.g. file name and frame number)?

Best regards,
Keneth

[Himansu Donga]

Can you try to set the LFCLK tolerance to 500ppm for test?

Ans: I will try this parameter and update you.

SDK12: 

// Low frequency clock source to be used by the SoftDevice
#define NRF_CLOCK_LFCLKSRC {.source = NRF_CLOCK_LF_SRC_XTAL = External Clock Source, \
.rc_ctiv = 0, \
.rc_temp_ctiv = 0, \
.xtal_accuracy = NRF_CLOCK_LF_XTAL_ACCURACY_20_PPM}

SDK14:

nrf_clock_lf_cfg_t const clock_lf_cfg =
{
.source = NRF_SDH_CLOCK_LF_SRC  = External Clock Source,
.rc_ctiv = NRF_SDH_CLOCK_LF_RC_CTIV = 0,
.rc_temp_ctiv = NRF_SDH_CLOCK_LF_RC_TEMP_CTIV = 0,
#ifdef S140
.xtal_accuracy = NRF_SDH_CLOCK_LF_XTAL_ACCURACY
#else
.accuracy = NRF_SDH_CLOCK_LF_XTAL_ACCURACY = NRF_CLOCK_LF_XTAL_ACCURACY_20_PPM
#endif
};

Regards,

Himansu

[Kenneth]

I assume you are using identical hardware here between the two. Then the only explanation I have is that the LFCLK may be on the very edge of tolerance. Please test with 500ppm yes.

Best regards,
Kenneth

[Himansu Donga]

Hi Kenneth,

I am using Single hardware for SDK12 and SDK14 Hardware verification.

I have test with 500ppm but got same result.

Please not same crystal setting work witj SDK12 is ok,but not work with SDK14.

Regards,

Himansu Donga

[Kenneth]

Hi,

Is it possible that you have other on-going activities that may be interfering with the link?

For instance: Can it be that you are using the softdevice to also search or have open an ANT channel, and/or scanning/advertising a second BLE link?

Best regards,
Kenneth

[SciTER Development Team]

hi Kenneth,

i have tried with ANT channel closed, then connection ratio improve by 40 to 50% but still issue not resolved.

Thanks,

Sandip

[Kenneth]

Any way you can create a simplified program I may run on a DK to recreate the problem here?