Can we call softdevice API before enabling softdevice ?

Question

Please check the answer

Susheel Nuguru · Accepted Answer

Not all SDS versions are clear on this. So I decided to make this info visible. 
 softdevice API are all the function calls with names starting with prefix sd_ which is exposed by softdevice. 
 
 Softdevice is enabled after successful
call to sd_softdevice_enable 
 Softdevice is disabled after
successful call to
sd_softdevice_disable 
 
 All the calls from nrf_sdm.h (SoftDevice Manager) are available before and after enabling softdevice. 
 if you check nrf_soc.h file. There is an enum that looks like below 
 enum NRF_SOC_SVCS 
{
 XXXX,
 XXXX
}
 
 All the defines inside this enum are intentionally made to look similar to the actual softdevice API call. for example enum value SD_NVIC_SYSTEMRESET is the SVC number for the softdevice call sd_nvic_systemreset() 
 Inside this enum, the SVC calls with numbers from 
 SOC_SVC_BASE
to 
SOC_SVC_BASE_NOT_AVAILABLE - 1
 
 should be available even though softdevice is not enabled. 
 The api calls from 
 SOC_SVC_BASE_NOT_AVAILABLE to SVC_SOC_LAST -1 
 only work when softdevice is enabled else they will return 
 #define NRF_ERROR_SOFTDEVICE_NOT_ENABLED (NRF_ERROR_BASE_NUM + 2) ///< SoftDevice has not been enabled