From 8bafb178a132d1118943224c1f73fe48aeb10e8d Mon Sep 17 00:00:00 2001
From: Thomas Basler <thomas@familie-basler.net>
Date: Fri, 27 Jan 2023 18:34:18 +0100
Subject: [PATCH] Fix #540: Do not output unit_of_meas if empty

---
 src/MqttHandleHass.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/MqttHandleHass.cpp b/src/MqttHandleHass.cpp
index 9d07fe1..0eaed40 100644
--- a/src/MqttHandleHass.cpp
+++ b/src/MqttHandleHass.cpp
@@ -113,9 +113,13 @@ void MqttHandleHassClass::publishField(std::shared_ptr<InverterAbstract> inv, ui
         DynamicJsonDocument root(1024);
         root[F("name")] = name;
         root[F("stat_t")] = stateTopic;
-        root[F("unit_of_meas")] = inv->Statistics()->getChannelFieldUnit(channel, fieldType.fieldId);
         root[F("uniq_id")] = serial + "_ch" + String(channel) + "_" + fieldName;
 
+        String unit_of_meausure = inv->Statistics()->getChannelFieldUnit(channel, fieldType.fieldId);
+        if (unit_of_meausure != "") {
+            root[F("unit_of_meas")] = unit_of_meausure;
+        }
+
         JsonObject deviceObj = root.createNestedObject("dev");
         createDeviceInfo(deviceObj, inv);