Changes for Sidelink RFSIM testing

	- UE1 is a SYNC REFERENCE UE - TX PSBCH
	   started using command -
		sudo RFSIMULATOR=server ./nr-uesoftmodem --rfsim --phy-test --sl-mode 2 --sync-ref
	- UE2 syncs onto UE1 - RX PSBCH and continues to receive PSBCH
	   started using command -
		sudo ./nr-uesoftmodem --rfsim --phy-test --sl-mode 2
	- In the default use case 2 Sidelink SSBs sent over 16 frames.

executables/nr-uesoftmodem.c

@@ -312,7 +312,7 @@ void set_options(int CC_id, PHY_VARS_NR_UE *UE){
 
 }
 
-void init_openair0(uint8_t is_sidelink) {
+void init_openair0(bool is_sidelink) {
   int card;
   int freq_off = 0;
   NR_DL_FRAME_PARMS *frame_parms = &PHY_vars_UE_g[0][0]->frame_parms;
@@ -538,7 +538,7 @@ int main( int argc, char **argv ) {
 
       if (UE[CC_id]->sl_mode) {
         AssertFatal(UE[CC_id]->sl_mode == 2, "Only Sidelink mode 2 supported. Mode 1 not yet supported\n");
-        nr_UE_configure_Sidelink(0, get_softmodem_params()->sync_ref);
+        nr_UE_configure_Sidelink(0, get_nrUE_params()->sync_ref);
         DevAssert(mac->if_module != NULL && mac->if_module->sl_phy_config_request != NULL);
         sl_nr_ue_phy_params_t *sl_phy = &UE[CC_id]->SL_UE_PHY_PARAMS;
         mac->if_module->sl_phy_config_request(&mac->SL_MAC_PARAMS->sl_phy_config);
@@ -550,7 +550,7 @@ int main( int argc, char **argv ) {
 
     }
 
-    uint8_t is_sl = (get_softmodem_params()->sl_mode) ? 1 : 0;
+    bool is_sl = (get_softmodem_params()->sl_mode) ? 1 : 0;
 
     init_openair0(is_sl);
     // init UE_PF_PO and mutex lock

executables/nr-uesoftmodem.h

@@ -12,6 +12,7 @@
 #define  CONFIG_HLP_DLSCH_PARA             "number of threads for dlsch processing 0 for no parallelization\n"
 #define  CONFIG_HLP_OFFSET_DIV             "Divisor for computing OFDM symbol offset in Rx chain (num samples in CP/<the value>). Default value is 8. To set the sample offset to 0, set this value ~ 10e6\n"
 #define  CONFIG_HLP_MAX_LDPC_ITERATIONS    "Maximum LDPC decoder iterations\n"
+#define  CONFIG_HLP_SL_SYNCSOURCEUE         "Sidelink UE acts as SYNC REF UE"
 /***************************************************************************************************************************************/
 /* command line options definitions, CMDLINE_XXXX_DESC macros are used to initialize paramdef_t arrays which are then used as argument
    when calling config_get or config_getlist functions                                                                                 */
@@ -61,6 +62,7 @@
   {"chest-time",                   CONFIG_HLP_CHESTTIME,       0,               .iptr=&(nrUE_params.chest_time),             .defintval=0,      TYPE_INT,      0}, \
   {"ue-timing-correction-disable", CONFIG_HLP_DISABLETIMECORR, PARAMFLAG_BOOL,  .iptr=&(nrUE_params.no_timing_correction),   .defintval=0,      TYPE_INT,      0}, \
   {"SLC",                          CONFIG_HLP_SLF,             0,               .u64ptr=&(sidelink_frequency[0][0]),         .defuintval=2600000000,TYPE_UINT64,0}, \
+  {"sync-ref",                      CONFIG_HLP_SL_SYNCSOURCEUE, PARAMFLAG_BOOL,  .uptr=&(nrUE_params.sync_ref),            .defuintval=0,      TYPE_UINT32,   0}, \
 }
 // clang-format on
 
@@ -82,6 +84,7 @@ typedef struct {
   int            threequarter_fs;
   int            N_RB_DL;
   int            ssb_start_subcarrier;
+  uint32_t       sync_ref;
 } nrUE_params_t;
 extern uint64_t get_nrUE_optmask(void);
 extern uint64_t set_nrUE_optmask(uint64_t bitmask);

openair2/RRC/NR_UE/rrc_UE.c

@@ -453,7 +453,7 @@ NR_UE_RRC_INST_t* openair_rrc_top_init_ue_nr(char* uecap_file, char* rrc_config_
     }
 
     if (get_softmodem_params()->sl_mode) {
-      configure_NR_SL_Preconfig(0,get_softmodem_params()->sync_ref);
+      configure_NR_SL_Preconfig(0,get_nrUE_params()->sync_ref);
     }
   }
   else{