Irregular unreasonable L2CAP Fragment

[HarryGe]

I use a NRF52832 with SDK15.3 S332,

#define NRF_SDH_BLE_GAP_DATA_LENGTH 251

#define NRF_SDH_BLE_GATT_MAX_MTU_SIZE 247

When my device as a periph sending data to the central, it works well,but the wireshark shows that there are occasional irregular L2CAP Fragment.

Every time I send multiple 127B data queues, one or several of the 127B data will be split.  

I can't find the reason，I also checked the data length, the CENTRAL REQ RX251 TX251,and my device also RSP RX251 TX251.

Although the data received by the host is correct, I am still confused about it.

[Edvin]

Hello,

Yes, it seems like the two fragments always adds up to 127 (from what I can see in your screenshot). 

Can you please upload the entire sniffer trace (save it as a .pcapng file, and upload it here). Then I can have a closer look, and see if I can figure out why it occationally split it up.

Best regards,

Edvin