ATT_MTU for 1 client 2 server

[Diana Vania]

Hi eveyone!!

Im new to BLE, I have tested the ATT_MTU example and it has worked perfectly but I'd like to implement it for one client and two servers. I've already made a try modifying the program for 2 servers but it didn't work fine (it gets stuck in the scanning phase). I'd appreciate your help very much.

[Simonr]

Hi

What modifications have you made exactly, and what SDK version and nRF52 device are you using? Are you using a Development kit or a custom board? Can you also provide some details as to how it is stuck in the scanning phase? Have you tried debugging the application to see if you can read an error code from the application?

The first thing that comes to mind is that the ATT_MTU example has set the number of links to 1 peripheral and one central link. This can be edited by changing the NRF_SDH_BLE_PERIPHERAL_LINK_COUNT, NRF_SDH_BLE_CENTRAL_LINK_COUNT and NRF_SDH_BLE_TOTAL_LINK_COUNT defines in the sdk_config.h header file of your project. Please note that the TOTAL_LINK_COUNT should be equal to the number of PERIPHERAL and CENTRAL link count added together. 

Best regards,

Simon

[Diana Vania]

Hi

Thanks for your reply. I have nrf52840-DK boards (www.google.com/search with SDK 17.0.2., I have set the number of links as well as pheripherals but when I run the program with the 3 boards, on the tester terminal it still gets stuck scanning and in the debugging i don't get any errors. I enclose screenshots of the terminal and sdk_config.h header file.

Thanks in advance,

Vania