Best practice for transfering 6+KB of data using BLE

RE: Best practice for transfering 6+KB of data using BLE

Menon — Thu, 19 Mar 2026 18:46:38 GMT

Hello,

Yes, the ATT payload is typically limited to 244 bytes (based on a commonly negotiated MTU of 247), so you cannot send all 750 logs in a single notification. While the Bluetooth specification allows an ATT MTU of up to 512 bytes (giving a maximum payload of 509 bytes), See the section Data length &PDU, and also check the config CONFIG_BT_L2CAP_TX_MTU=512.

Regardless of whether the payload per notification is 244 bytes or up to 509 bytes, this does not limit the total amount of data you can transfer. BLE supports sending larger datasets by splitting the data across multiple notifications. In your case, sending 750 logs is completely feasible, you simply transmit them in chunks over multiple notifications.

Kind Regards,

Abhijith

RE: Best practice for transfering 6+KB of data using BLE

Menon — Wed, 18 Mar 2026 14:29:09 GMT

Hello,

Apologies for the delay. You can expect a response by the end of tomorrow.

Kind Regards,

Abhijith

RE: Best practice for transfering 6+KB of data using BLE

Menon — Mon, 16 Mar 2026 16:15:10 GMT

Hello,

Just letting you know that I have been assigned to this case and am currently looking into it. I will get back to you soon.

Kind Regards,

Abhijith