Publish inverter stats only if values are updated

include/MqttPublishing.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "Configuration.h"
 #include <Arduino.h>
 #include <Hoymiles.h>
 #include <memory>
@@ -11,6 +12,8 @@ public:
 
 private:
     void publishField(String subtopic, std::shared_ptr<InverterAbstract> inv, uint8_t channel, uint8_t fieldId);
+
+    uint32_t _lastPublishStats[INV_MAX_COUNT];
 };
 
 extern MqttPublishingClass MqttPublishing;

lib/Hoymiles/src/inverters/InverterAbstract.cpp

@@ -111,10 +111,16 @@ uint8_t InverterAbstract::verifyAllFragments()
         memcpy(&_payloadStats[offs], _rxFragmentBuffer[i].fragment, _rxFragmentBuffer[i].len);
         offs += (_rxFragmentBuffer[i].len);
     }
+    _lastStatsUpdate = millis();
 
     return 0;
 }
 
+uint32_t InverterAbstract::getLastStatsUpdate()
+{
+    return _lastStatsUpdate;
+}
+
 uint8_t InverterAbstract::getChannelCount()
 {
     const byteAssign_t* b = getByteAssignment();

lib/Hoymiles/src/inverters/InverterAbstract.h

@@ -111,6 +111,8 @@ public:
     const char* getUnit(uint8_t channel, uint8_t fieldId);
     const char* getName(uint8_t channel, uint8_t fieldId);
 
+    uint32_t getLastStatsUpdate();
+
 private:
     serial_u _serial;
     char _name[MAX_NAME_LENGTH];
@@ -120,4 +122,5 @@ private:
     uint8_t _rxFragmentRetransmitCnt = 0;
 
     uint8_t _payloadStats[MAX_RF_FRAGMENT_COUNT * MAX_RF_PAYLOAD_SIZE];
+    uint32_t _lastStatsUpdate = 0;
 };

src/MqttPublishing.cpp

@@ -1,5 +1,4 @@
 #include "MqttPublishing.h"
-#include "Configuration.h"
 #include "MqttSettings.h"
 #include <Every.h>
 
@@ -34,6 +33,10 @@ void MqttPublishingClass::loop()
 
             MqttSettings.publish(subtopic + "/name", inv->name());
 
+            uint32_t lastUpdate = inv->getLastStatsUpdate();
+            if (lastUpdate > 0 && lastUpdate != _lastPublishStats[i]) {
+                _lastPublishStats[i] = lastUpdate;
+
                 // Loop all channels
                 for (uint8_t c = 0; c <= inv->getChannelCount(); c++) {
                     publishField(subtopic, inv, c, FLD_UDC);
@@ -51,6 +54,7 @@ void MqttPublishingClass::loop()
                     publishField(subtopic, inv, c, FLD_EFF);
                     publishField(subtopic, inv, c, FLD_IRR);
                 }
+            }
 
             yield();
         }