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Increase the maximum MTU on nRF51

Hi,

I'm using nRF51 (softdevice S130) in my project as BLE peripheral to send data to my smartphone.
The current data flow has become insufficient because the maximum MTU could be supported by the nRF51 (23 bytes) is lower compared to the our need.
There is any way to increase the maximum MTU to 248 bytes (like nRF52)knowing that the BLE 4.2 specification allows it ?

Best Regards.

Mehdi.

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