USRP: add a T trace to record the RX IQ data on antenna 0

common/utils/T/T_messages.txt

@@ -4,6 +4,11 @@ ID = ENB_MASTER_TICK
     GROUP = ALL:GENERAL:ENB
     FORMAT = int,eNB_ID : int,frame : int,subframe
 
+ID = USRP_RX_ANT0
+    DESC = RX IQ data as received by USRP driver on antenna 0
+    GROUP = ALL:HEAVY
+    FORMAT = int,timestap : buffer,data
+
 #PHY logs
 ID = ENB_PHY_UL_TICK
     DESC = eNodeB uplink tick - one tick per ms at start of uplink processing

radio/USRP/usrp_lib.cpp

@@ -768,6 +768,8 @@ static int trx_usrp_read(openair0_device *device, openair0_timestamp *ptimestamp
   s->rx_timestamp = s->rx_md.time_spec.to_ticks(s->sample_rate);
   *ptimestamp = s->rx_timestamp;
 
+  T(T_USRP_RX_ANT0, T_INT(s->rx_timestamp), T_BUFFER(buff[0], samples_received*4));
+
   recplay_state_t *recPlay=device->recplay_state;
 
   if (device->openair0_cfg->recplay_mode == RECPLAY_RECORDMODE) { // record mode