Change MTU with nRF Connect for Desktop

[acanidio]

Hello,

I am using nRF Connect for Desktop 3.7.1 with a nRF52840 USB dongle for testing purposes.

In the Bluetooth Low Energy 2.5.3 application I deselected the "Auto accept update requests".
This shows me a view to request an ATT MTU exchange. The problem is that the field cannot
be edited but only accepted or discarded (correctly leading to a disconnection).

Is it a bug or the program is working as intended and I am missing something? I'd like something
like the “Request MTU” menu entry in the nRF Connect Android version.

PS: I saw a different ticket very similar to my request but I didn't find any answer that satisfies me:
devzone.nordicsemi.com/.../request-mtu-with-nrf-connect-for-desktop-as-gatt-client

Best regards,

Andrea

[acanidio]

Hi,

I checked the problem and it seems that it can be reproduced also with a normal NFR52-DK with the ble_app_hrs which supports DLE and ATT MTU longer than 23 bytes, so you can reproduce it yourself.

I flashed the ble_app_hrs_pca10040_s132 HEX file to the board and connected to it with Bluetooth Low Energy 2.5.3  the with a NRF52840 USB dongle.

Given the fact that I deselected the "Auto accept update requests" option on the nRF5x device what I get when I connect to the Nordic_HRM is the following screen, where DLE nor ATT MTU are not configurable but only acceptable. Am I missing something in the DLE and ATT MTU concept or is it a limitation of the app? Because I think this could be a very usefu yet simple feature to add.

ATT MTU exchange

DLE exhange

Best regards,

Andrea

[ovrebekk]

Hi Andrea

Sorry for the slow response. Håkon is currently on leave, and I will handle your case in the mean time. 

Would it be a workaround to simply change to a different data length and MTU after accepting the request, by using the Update data length... and Update MTU... functions here?

Best regards
Torbjørn