Getting unknown error when reading a characteristic value with RTC systick for freertos

[KarthickAnandan]

Hi Team,

I have a custom characteristic with authorized read enabled. It is working fine if  I use FREERTOS_USE_SYSTICK as configTICK_SOURCE. If I use FREERTOS_USE_RTC I am getting unknown error when I read the characteristic value using NRF connect app (Attached the screenshot).

In non working case I found following scenarios

1. If I directly read characteristic value after connecting I am getting Error 168(0xa8): UNKNOWN(168) or Error 8(0x8): GATT INSUF AUTHORIZATION(Refer screenshot).

2. In this case if I read notification and indication status and followed by characteristic value read I am getting value(working refer screenshot)

3. But if I enable or disable notification(write) and after that if I do characteristic value read I am getting Error 64(0x40): UNKNOWN(64). After this even repeating step 2 was not able to read data.

NOTE: This problem doesn't occur in one plus 6(even with RTC) phone but occurs for pixel2 and Samsung phone.

[Susheel Nuguru]

Can you please attach your project for me to test it with my Samsung phone. It is very hard to say why you get those errors only with specific phones without replicating the issue on my desk.