Size of data bytes

[lm]

Hello,

i'm programing a nrf52832 and a nrf52805 and I'm using the peripheral uart example, I would like to change the size of the bytes of my rx and tx that I can send (150 or less) because for now this is 20 characters maximum.

I already tried to change the size of NRF_SDH_BLE_GATT_MAX_MTU_SIZE. He has a valor of 247 but my program is not working after that.

Thank you so much for your help. 

[lm]

https://devzone.nordicsemi.com/f/nordic-q-a/28388/android-sending-data-20-bytes-by-ble i saw this post about the augmentation of size of bytes but i would like to apply this method to RX AND TX peripheral_uart example. My goal is to send notifcations by packet of 20 bytes to permit to send a lot of info. Do you have a solution? thank you in advance

[lm]

im using the sdk 17.1 too

[lm]

7853.pca10040e_nrf52805.zip

[ovrebekk]

Hi

Thanks for sharing the code, but it seems you forgot to include the main.c file?

When sharing a project please zip the top folder, including the main.c file and all the pcaXXX folders, like I did when sharing my project with you in the other case. 

Best regards
Torbjørn

[lm]

okay i send you the code

[lm]

6138.pca10040e_nrf52805.zipwith the main file in it

[ovrebekk]

Hi

I was able to reproduce your issue, and traced it down to a missing define in sdk_config.h:

In later versions of the SDK it is necessary to include NRF_BLE_GATT_MTU_EXCHANGE_INITIATION_ENABLED in order to have the peripheral initiate the MTU exchange procedure, otherwise it is necessary for the phone to do this. 

Could you try to build your project with this define included and see if it fixes the issue?

Best regards
Torbjørn

[lm]

yes its working thank you so much.....

[ovrebekk]

I am glad to hear it. I will consider this case closed then