timeslot for ccm encryption

[abyr]

I want to secure advertised packets using ccm 

I am using s132 , SDK 14.2.0  and nrf52 dk

I found that AES-CCM peripheral is blocked by soft device usage and that I need to use Time slot APi

I was referring to this to do so.

EDIT:

I can not perform the changes that should be done in the main file. In fact, in my project I do not have the function stated below nor any of the called functions. I was thinking to create it but I do not know how to use it later. My start point is the beacon application.

And I can not find the files softdevice_handler.h and softdevice_handler.c in the directory of nRF5_SDK_14.2.0_17b948a . I have researched this file and it seems that it is an API for initializing and disabling the SoftDevice so it is mandaory but I can not find it what should I do 

static void sys_evt_dispatch(uint32_t sys_evt)
{
    pstorage_sys_event_handler(sys_evt);
    ble_advertising_on_sys_evt(sys_evt);
}

[Sigurd]

Ok, what SDK version AND toolchain(Segger Embedded Studio,Keil,gcc,IAR,etc) do you want the example in ?

[abyr]

segger embedded studio

sdk14.2.0

[Sigurd]

Hi,

Here the timeslot tutorial you linked to, but with SDK 14.2:

ble_app_beacon_timeslot_tutorial_sdk14_2.rar

Here is a more complex timeslot implementation using this implemenation.

ble_app_beacon_raal_timeslot.rar

Here is timeslot tutorial + added some ESB + CCM code from this repo. Note that it might need some adjusting on how often it request a timeslot.

ble_app_beacon_timeslot_esb_experimental.rar

Again, not sure if CCM is what you are really after, it could be that ECB is better suited for what you are making.

[abyr]

would you explain why ECB is better suited for doing this ??

[Sigurd]

The AES CCM is tightly tailored towards the radio and BLE security, while the AES ECB is more generic and doesn't need to be used in a timeslot.