ESP32 Forum

Posted: **Sun Nov 07, 2021 3:15 am**

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

Posted: **Mon Oct 17, 2022 11:32 am**

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

ESP32 Forum

How to set the MTU for BLE Nimble

How to set the MTU for BLE Nimble

Re: How to set the MTU for BLE Nimble