central stops receiving after sometime

[Nivetha]

Hi,

Central: nrf52840

peripheral: nrf52840

Connection interval (both min & max) = 10ms

ATT_MTU size: 52 bytes

Dle: 52+4 bytes

Connection event extension: enabled

Slave latency: 0

Connection supervision timeout: 4s

PHY: 1MBps

softdevice: 140

I'm transmitting 10 samples wrapped to 48 bytes as notification and hence set the ATT_MTU size to 52 bytes considering the overhead for notification to 3 bytes + 1 extra safe side. The issue is suddenly after 30 mins there is a disconnection and I get to see only EMPTY DATA PDU through nrf sniffer. However, I didn't notice anything as Connection Disconnection timeout or so. It's just after the last notification, I get to see only EMPTY DATA PDU and no samples at the UART(which is logged at the central) This is for a medical application. So I need to maintain this throughput with very low/0 latency and no potential disconnection. Your valuable suggestions will help me fix the problem.

LOG

Thanks, Nivetha

[Nivetha]

@Martin I disabled the NRF_LOG_DEFFERED option. As you said, this was causing the "Overflow" message log. By default, NRF_LOG_BACKEND_RTT_OUTPUT_BUFFER_SIZE is set to 512 bytes. Hence, I didn't increase it further. I ran the test for more than 2 hours and have not seen any disconnection. I'm slightly puzzled! Did this call the app_error_fault_handler from the soft device fault handler? Is so, crashing the system because of log buffer overflow is not acceptable.