adding getSmpSynch in sv subscriber

src/sampled_values/sv_subscriber.c

@@ -878,6 +878,24 @@ SVSubscriber_ASDU_getDataSize(SVSubscriber_ASDU self)
     return self->dataBufferLength;
 }
 
+uint16_t
+SVSubscriber_ASDU_getSmpSynch(SVSubscriber_ASDU self)
+{
+    uint16_t retVal;
+    uint8_t* valBytes = (uint8_t*) &retVal;
+
+#if (ORDER_LITTLE_ENDIAN == 1)
+    valBytes[0] = self->smpSynch[1];
+    valBytes[1] = self->smpSynch[0];
+#else
+    valBytes[0] = self->smpSynch[0];
+    valBytes[1] = self->smpSynch[1];
+#endif
+
+    return retVal;
+
+}
+
 uint16_t
 SVClientASDU_getSmpCnt(SVSubscriber_ASDU self)
 {

src/sampled_values/sv_subscriber.h

@@ -528,6 +528,16 @@ SVSubscriber_ASDU_getQuality(SVSubscriber_ASDU self, int index);
 int
 SVSubscriber_ASDU_getDataSize(SVSubscriber_ASDU self);
 
+/**
+ * \brief return the SmpSynch value included in the SV ASDU
+ *
+ * The SmpSynch gives information about the clock synchronization.
+ *
+ * \param self ASDU object instance
+ */
+uint16_t
+SVSubscriber_ASDU_getSmpSynch(SVSubscriber_ASDU self);
+
 #ifndef DEPRECATED
 #if defined(__GNUC__) || defined(__clang__)
   #define DEPRECATED __attribute__((deprecated))