EmptyPDU will not be sent

[m-o]

Hi there

I wrote SDK 17.2 ble_app_hrs to the module.

When connecting to an Android device, Empty PDUs will no longer be sent.
I checked the RTC COUNTER, but it is incremented.
Occurs only in certain modules.

What should I check to isolate the problem as HW or SW?

Thanks

[Sigurd]

When connecting to an Android device, Empty PDUs will no longer be sent.

Could you capture a sniffer trace, and upload it here?

https://www.nordicsemi.com/Products/Development-tools/nRF-Sniffer-for-Bluetooth-LE

Do you have the log from nrf_log as well?

[m-o]

Thank you Sigurd

The person in charge of HW contacted me.
The 32K clock was not working properly.

Will softdevice stop working if the 32k clock deviates from the "NRF_SDH_CLOCK_LF_ACCURACY" range?

[Sigurd]

m-o said:

Will softdevice stop working if the 32k clock deviates from the "NRF_SDH_CLOCK_LF_ACCURACY" range?

It could then open the RX window too late/early, and you risk packet loss/retransmissions.

Do you have external LF crystal on you board? If no, make sure that you in sdk_config.h set NRF_SDH_CLOCK_LF_SRC to 0, NRF_SDH_CLOCK_LF_RC_CTIV to 16, NRF_SDH_CLOCK_LF_RC_TEMP_CTIV to 2, and NRF_SDH_CLOCK_LF_ACCURACY to 1. Make sure that this is done for both the application and bootloader projects.