How to set the MTU for BLE Nimble

[dazzalicious]

Hi,

I have adapted the NIMBLE BLE examples blecent and bleprph and have a situation where my blecent ESP32-C3 chip is trying to write 192 values in a

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uint16_t [192]

array to the bleprph chip with the

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ble_gattc_write_flat()

function. At the moment only 20 of the values are being received. I think that I need to increase the MTU, but changing the skconfig file with

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idf.py menuconfig

from

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CONFIG_BT_NIMBLE_ATT_PREFERRED_MTU=256

to 512 has no effect I still only receive the first 20 values.

Is there a way to increase the MTU to solve this? I would prefer to send the 192 values in one packet so I would prefer not to use the long write function.

I'm sorry if this is question asked often, I can't seem to get the search button on the forum posts to show any similar posts.

Thanks
Darren

[toljatyr]

It is not enough to set your local MTU size but the App also has to request an increased MTU size