Optimizing L2CAP throughput

RE: Optimizing L2CAP throughput

Sigurd — Wed, 30 Apr 2025 11:07:18 GMT

Here is a screenshot from the wireshark trace:

From what I can tell, the nRF5 device have the MD-bit (MoreData) set at the end of each connection event, so from the nRF5-side of things, the packet exchange can continue. But the central ends the connection event. Looks like the central only support up-to 5 pack-pair each connection event. Maybe the central is doing something else, other connections, scanning for other devices at the same time, that is causing this, or maybe the central simply only support 5 packet-pair each connection event.

RE: Optimizing L2CAP throughput

denis — Thu, 24 Apr 2025 14:57:26 GMT

Here is the Wireshark capture for a transaction. The bt_l2cap_chan_send sequences we are trying to optimize are in the second half of the capture.

devzone.nordicsemi.com/.../bt_5F00_l2cap_5F00_chan_5F00_send.pcapng

RE: Optimizing L2CAP throughput

Sigurd — Thu, 24 Apr 2025 12:34:16 GMT

Hi!

Could you post a sniffer log? https://www.nordicsemi.com/Products/Development-tools/nrf-sniffer-for-bluetooth-le