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

[MartinBL]

Since this gets sent to you via softdevice_fault_handler() ID 4097 actually points to NRF_FAULT_ID_APP_MEMACC in nrf_sdm.h:

#define NRF_FAULT_ID_APP_MEMACC   (NRF_FAULT_ID_APP_RANGE_START + 1)          /**< Application invalid memory access. The info parameter will contain 0x00000000,
                                                                                   in case of SoftDevice RAM access violation. In case of SoftDevice peripheral
                                                                                   register violation the info parameter will contain the sub-region number of
                                                                                   PREGION[0], on whose address range the disallowed write access caused the
                                                                                   memory access fault. */