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]

I have enabled data length extension to 52+4 bytes on peripheral and central. Is this causing any issue? Because the debug log "Peer on connection requested an ATT MTU of 52 bytes" is not seen after successful reconnection after disconnection. Only during this failure, I observed this log being printed. Does it imply that something is wrong during update params?