From 10f0d843497b5e4fbd51e07e9dde9f9720d8542d Mon Sep 17 00:00:00 2001
From: Steffen Vogel <post@steffenvogel.de>
Date: Wed, 6 Dec 2017 15:42:23 +0800
Subject: [PATCH] sv: smpRate is an optional ASDU attribute. We shall only
 encode it if it was set before

---
 src/sampled_values/sv_publisher.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/sampled_values/sv_publisher.c b/src/sampled_values/sv_publisher.c
index 4bb663e7..ed2c904d 100644
--- a/src/sampled_values/sv_publisher.c
+++ b/src/sampled_values/sv_publisher.c
@@ -398,8 +398,10 @@ SVPublisher_ASDU_encodeToBuffer(SVPublisher_ASDU self, uint8_t* buffer, int bufP
     buffer[bufPos++] = self->smpSynch;
 
     /* SmpRate */
-    bufPos = BerEncoder_encodeTL(0x86, 2, buffer, bufPos);
-    bufPos = encodeUInt16FixedSize(self->smpRate, buffer, bufPos);
+    if (self->hasSmpRate) {
+        bufPos = BerEncoder_encodeTL(0x86, 2, buffer, bufPos);
+        bufPos = encodeUInt16FixedSize(self->smpRate, buffer, bufPos);
+    }
 
     /* Sample */
     bufPos = BerEncoder_encodeTL(0x87, self->dataSize, buffer, bufPos);