fds_record_write doesn't trigger a FDS_EVT_WRITE event

Question

Hello, 
 My problem is pretty much identical to this one: 
 devzone.nordicsemi.com/.../ 
 My functions look exactly like the ones posted in the original question and I was indeed making the same mistake that was being made in that case. But after I applied the fix, and added the fs_sys_evt_handler to my softdevice callback, I still did not receive any flash events. I have even tried copy pasting most of the code from the original question, but that hasn't worked either. 
 I am using an nRF51 board with the s130 softdevice and the v12.1.0 SDK. Any help would be appreciated! 
 Thank you. 
 Regards,
Sid

singular · Answer

I ran into a similar problem with SDK v14.2.0. 
 The problem was in missing nrf_sdh_soc.c target in the Makefile. There is an sdh stack observer function m_nrf_sdh_soc_evts_poll(), which was not compiled and placed in the sdh_stack_observers section (could be checked in a *.map file). 
 The nrf_sdh_soc.c consists of m_nrf_sdh_soc_evts_poll() function only thus no error was generated on linking stage. 
 I hope this could help someone.