Max packet size declaration is 20 bytes but why the real max size is 244 bytes for nrf52840 using ble_uart ?

[ox00]

I dont get it. Please someone tell me.

[Vidar Berg]

Hi,

The effective payload is 20 bytes by default for any BLE link. But you can negotiate longer MTU packets after a connection is established, see the GATT Module documentation for more details.