How to change MTU size?


I tried every configuration options one by one to change the MTU size, but it doesn't work.

I connect to nRF52840 with Raspbery Pi and when I subscribe to a notification, I receive the following error:

<wrn> bt_att: No ATT channel for MTU 30
<wrn> bt_gatt: No buffer available to send notification
<err> app: Couldn't send notificaton. (err: -12)


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