ble time sync among nrf52840 devices with old SDK

Hi,

I was looking for a way time sync among nrf52840 devices and I found "Wireless timer synchronization among nRF5 devices" guide and the git hub.

However, it seems like the git hub code is for NCS and my project is based on old SDK (nRF5_SDK_15.3.0_59ac345).

Does anyone know if there is the time sync code for old SDK versions?

Thanks in advance.

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