Configurable ATT MTU

[milav]

Is this possible to change MTU Size in nrf51822 Board from 23 to 43?

is any changes is done android side app? the application is same copy of nrf Toolbox UART app.

please suggest me a right way.

Thank YOu

[endnode]

Not with Nordic stack as far as I understand, all S110/120/130 versions support only default ATT_MTU size (for memory reasons - it requires certain amount of RAM).

[John]

I'm not sure this is correct. I just took a quick look at the Nordic website documentation. Under the nRF51 soft devices, the S130 indicated it supported Bluetooth 4.2 with configurable ATT MTU.

[Sigurd]

It's a documentation bug, it's not listed in e.g. the corresponding "Key features" section in the PDF document here(S130 SDS). If Configurable ATT MTU is needed, switch to nRF52832.

[endnode]

(or try to go with other stack than Nordic Soft Device, there might be some luck with Zephyr or Mynewt...)

[milav]

Any changes is to be done in Android app?

I change ATT MTU request to be...1500 in Android...side.....we receive....2912 bytes in 3 sec....

Is this congratulation correct?

[endnode]

Devices will settle on lower from two maximums so if one device supports max 23 the ATT_MTU stays on 23. Also how you can set MTU size through Android API and what stack supports such high value (1500)? Sounds pretty unreal.