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(BLE): How can I send more than 20bytes from a server with notify?

Project context:
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Server BLE  for home trainer diy

Target  (Bluetooth server) : Bluefruit nRF52 The feather
Library : BluefruitBLE
Client : nRF Connect (Android)

- no descriptor added

- work fine for an other characteristic (CyclingSpeedAndCadence Measurement)

Problem description:
-----------------------
I work with the characteristic (CyclingPowerMeasurement (0x2A63, UUID GATT), which size is 32 bytes.

I check the characteristic with nRF Connect:
 - When Read : Good size (32 bytes) , and the good values.
 - When Notify: Only 20 bytes, and not the good values.



Some suggestions:
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I think there is a limitation of 20 bytes..
but i don't know how to modify or check it


thanks!!!!

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