https://devzone.nordicsemi.com/f/nordic-q-a/114676/optimizing-nus-client-to-server-latencyHi! Background (feel free to skip) --------------------------------------- We have 3 nRF52840 boards, connected via ble/NUS as follows: B also advertises bluetooth HID, and both B and C feature a USB HID. Following text considers the connection betweenen-USTelligent Community 13Wed, 23 Oct 2024 23:58:34 GMThttps://devzone.nordicsemi.com/thread/507661?ContentTypeID=1Wed, 23 Oct 2024 23:58:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7e074199-0b08-4e9c-84fa-9c8bcec58d7eSigurd<p>Hi!</p> [quote user=""]am I right that server-to-client communication aggregates and splits our messages into (smaller number of) ble packets?[/quote] <p>Could be, but it depends on the&nbsp;negotiated ATT MTU and DLE sizes between server and client, and what packet type is used, etc. A nrf-sniffer trace could confim that.&nbsp;<a href="https://www.nordicsemi.com/Products/Development-tools/nRF-Sniffer-for-Bluetooth-LE">https://www.nordicsemi.com/Products/Development-tools/nRF-Sniffer-for-Bluetooth-LE</a></p> [quote user=""]- Can we achieve the same packet-aggregation behavior for client-to-server communication?[/quote] <p>Should be possible, for fast client to server communication, use write command.</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1729727870380v1.png" alt=" " /></p> [quote user=""]- Is there a way to make the client send a packet every 7.5ms?[/quote] <p>Yeah, that should not be an issue. Likely you are getting the callback in the next connection event, but it&#39;s actually is sent every 7.5ms.&nbsp;<span>A nrf-sniffer trace could confim that.</span></p><div style="clear:both;"></div>