diff --git a/examples/iec61850_9_2_LE_example/iec61850_9_2_LE_example.c b/examples/iec61850_9_2_LE_example/iec61850_9_2_LE_example.c
index d63554d8..259736f6 100644
--- a/examples/iec61850_9_2_LE_example/iec61850_9_2_LE_example.c
+++ b/examples/iec61850_9_2_LE_example/iec61850_9_2_LE_example.c
@@ -92,6 +92,7 @@ setupSVPublisher(const char* svInterface)
     vol4q = SVPublisher_ASDU_addQuality(asdu);
 
     SVPublisher_ASDU_setSmpCntWrap(asdu, 4000);
+    SVPublisher_ASDU_setRefrTm(asdu, 0);
 
     SVPublisher_setupComplete(svPublisher);
 }
@@ -220,6 +221,8 @@ main(int argc, char** argv)
             SVPublisher_ASDU_setINT32(asdu, vol4, voltageN);
             SVPublisher_ASDU_setQuality(asdu, vol4q, q);
 
+            SVPublisher_ASDU_setRefrTm(asdu, Hal_getTimeInMs());
+
             SVPublisher_ASDU_setSmpCnt(asdu, (uint16_t) sampleCount);
 
             SVPublisher_publish(svPublisher);
diff --git a/src/sampled_values/sv_publisher.c b/src/sampled_values/sv_publisher.c
index b703ad46..75e48c72 100644
--- a/src/sampled_values/sv_publisher.c
+++ b/src/sampled_values/sv_publisher.c
@@ -63,6 +63,8 @@ struct sSVPublisher_ASDU {
     uint16_t smpRate;
 
     uint8_t* smpCntBuf;
+    uint8_t* refrTmBuf;
+    uint8_t* smpSynchBuf;
 
     SVPublisher_ASDU _next;
 };
@@ -386,11 +388,13 @@ SVPublisher_ASDU_encodeToBuffer(SVPublisher_ASDU self, uint8_t* buffer, int bufP
     /* RefrTm */
     if (self->hasRefrTm) {
         bufPos = BerEncoder_encodeTL(0x84, 8, buffer, bufPos);
+        self->refrTmBuf = buffer + bufPos;
         bufPos = encodeUtcTime(self->refrTm, buffer, bufPos);
     }
 
     /* SmpSynch */
     bufPos = BerEncoder_encodeTL(0x85, 1, buffer, bufPos);
+    self->smpSynchBuf = buffer + bufPos;
     buffer[bufPos++] = self->smpSynch;
 
     /* SmpRate */
@@ -651,7 +655,8 @@ SVPublisher_ASDU_setSmpCnt(SVPublisher_ASDU self, uint16_t value)
 {
     self->smpCnt = value;
 
-    encodeUInt16FixedSize(self->smpCnt, self->smpCntBuf, 0);
+    if (self->smpCntBuf != NULL)
+        encodeUInt16FixedSize(self->smpCnt, self->smpCntBuf, 0);
 }
 
 void
@@ -665,7 +670,14 @@ SVPublisher_ASDU_increaseSmpCnt(SVPublisher_ASDU self)
 {
     self->smpCnt = ((self->smpCnt + 1) % self->smpCntLimit);
 
-    encodeUInt16FixedSize(self->smpCnt, self->smpCntBuf, 0);
+    if (self->smpCntBuf != NULL)
+        encodeUInt16FixedSize(self->smpCnt, self->smpCntBuf, 0);
+}
+
+void
+SVPublisher_ASDU_enableRefrTm(SVPublisher_ASDU self)
+{
+    self->hasRefrTm = true;
 }
 
 void
@@ -673,6 +685,9 @@ SVPublisher_ASDU_setRefrTm(SVPublisher_ASDU self, uint64_t refrTm)
 {
     self->hasRefrTm = true;
     self->refrTm = refrTm;
+
+    if (self->refrTmBuf != NULL)
+        encodeUtcTime(self->refrTm, self->refrTmBuf, 0);
 }
 
 void
@@ -689,6 +704,12 @@ SVPublisher_ASDU_setSmpRate(SVPublisher_ASDU self, uint16_t smpRate)
     self->smpRate = smpRate;
 }
 
+void
+SVPublisher_ASDU_setSmpSynch(SVPublisher_ASDU self, uint16_t smpSynch)
+{
+    self->smpSynch = smpSynch;
+    *(self->smpSynchBuf) = self->smpSynch;
+}
 
 /*******************************************************************
  * Wrapper functions to support old API (remove in future versions)
diff --git a/src/sampled_values/sv_publisher.h b/src/sampled_values/sv_publisher.h
index 1ea27c1e..5c7fcebc 100644
--- a/src/sampled_values/sv_publisher.h
+++ b/src/sampled_values/sv_publisher.h
@@ -304,6 +304,16 @@ SVPublisher_ASDU_increaseSmpCnt(SVPublisher_ASDU self);
 LIB61850_API void
 SVPublisher_ASDU_setSmpCntWrap(SVPublisher_ASDU self, uint16_t value);
 
+/**
+ * \brief Enables the transmission of refresh time attribute of the ASDU
+ *
+ * The refresh time is the time when the data in put into the sampled values buffer
+ *
+ * \param[in] self the Sampled Values ASDU instance.
+ */
+void
+SVPublisher_ASDU_enableRefrTm(SVPublisher_ASDU self);
+
 /**
  * \brief Set the refresh time attribute of the ASDU.
  *
@@ -318,8 +328,10 @@ SVPublisher_ASDU_setRefrTm(SVPublisher_ASDU self, uint64_t refrTm);
  * The attribute SmpMod shall specify if the sample rate is defined in units of samples per nominal period, samples per second or seconds per sample.
  * If it is missing, the default value is samples per period.
  *
+ * NOTE: Function has to be called before calling \ref SVPublisher_setupComplete
+ *
  * \param[in] self the Sampled Values ASDU instance.
- * \param smpMod one of IEC61850_SV_SMPMOD_PER_NOMINAL_PERIOD, IEC61850_SV_SMPMOD_SAMPLES_PER_SECOND or IEC61850_SV_SMPMOD_SECONDS_PER_SAMPLE
+ * \param[in] smpMod one of IEC61850_SV_SMPMOD_PER_NOMINAL_PERIOD, IEC61850_SV_SMPMOD_SAMPLES_PER_SECOND or IEC61850_SV_SMPMOD_SECONDS_PER_SAMPLE
  */
 LIB61850_API void
 SVPublisher_ASDU_setSmpMod(SVPublisher_ASDU self, uint8_t smpMod);
@@ -330,12 +342,31 @@ SVPublisher_ASDU_setSmpMod(SVPublisher_ASDU self, uint8_t smpMod);
  * The attribute SmpRate shall specify the sample rate.
  * The value shall be interpreted depending on the value of the SmpMod attribute.
  *
+ * NOTE: Function has to be called before calling \ref SVPublisher_setupComplete
+ *
  * \param[in] self the Sampled Values ASDU instance.
- * \param smpRate Amount of samples (default per nominal period, see SmpMod).
+ * \param[in] smpRate Amount of samples (default per nominal period, see SmpMod).
  */
 LIB61850_API void
 SVPublisher_ASDU_setSmpRate(SVPublisher_ASDU self, uint16_t smpRate);
 
+/**
+ * \brief Set the clock synchronization information
+ *
+ * Default value is not synchronized (0).
+ * Possible values are:
+ * 0 = SV are not synchronized by an external clock signal.
+ * 1 = SV are synchronized by a clock signal from an unspecified local area clock.
+ * 2 = SV are synchronized by a global area clock signal (time traceable).
+ * 5 to 254 = SV are synchronized by a clock signal from a local area clock identified by this value.
+ * 3;4;255 = Reserved values – Do not use.
+ *
+ * \param[in] self the Sampled Values ASDU instance.
+ * \param[in] smpSynch the clock synchronization state
+ */
+void
+SVPublisher_ASDU_setSmpSynch(SVPublisher_ASDU self, uint16_t smpSynch);
+
 /**@} @}*/
 
 #ifndef DEPRECATED