Added check in statistics data that at least all required bytes are received

It can occour for some inverters that incomplete fragments with valid crc but less bytes are received

This was mentioned in #1084

lib/Hoymiles/src/commands/MultiDataCommand.cpp

@@ -92,3 +92,12 @@ void MultiDataCommand::udpateCRC()
     _payload[24] = (uint8_t)(crc >> 8);
     _payload[25] = (uint8_t)(crc);
 }
+
+uint8_t MultiDataCommand::getTotalFragmentSize(fragment_t fragment[], uint8_t max_fragment_id)
+{
+    uint8_t fragmentSize = 0;
+    for (uint8_t i = 0; i < max_fragment_id; i++) {
+        fragmentSize += fragment[i].len;
+    }
+    return fragmentSize;
+}

lib/Hoymiles/src/commands/MultiDataCommand.h

@@ -20,6 +20,7 @@ protected:
     void setDataType(uint8_t data_type);
     uint8_t getDataType();
     void udpateCRC();
+    static uint8_t getTotalFragmentSize(fragment_t fragment[], uint8_t max_fragment_id);
 
     RequestFrameCommand _cmdRequestFrame;
 };

lib/Hoymiles/src/commands/RealTimeRunDataCommand.cpp

@@ -3,6 +3,7 @@
  * Copyright (C) 2022 Thomas Basler and others
  */
 #include "RealTimeRunDataCommand.h"
+#include "Hoymiles.h"
 #include "inverters/InverterAbstract.h"
 
 RealTimeRunDataCommand::RealTimeRunDataCommand(uint64_t target_address, uint64_t router_address, time_t time)
@@ -25,6 +26,18 @@ bool RealTimeRunDataCommand::handleResponse(InverterAbstract* inverter, fragment
         return false;
     }
 
+    // Check if at least all required bytes are received
+    // In case of low power in the inverter it occours that some incomplete fragments
+    // with a valid CRC are received.
+    if (getTotalFragmentSize(fragment, max_fragment_id) < inverter->Statistics()->getMaxByteCount()) {
+        Hoymiles.getMessageOutput()->printf("ERROR in %s: Received fragment size: %d min. expected size: %d\r\n",
+            getCommandName().c_str(),
+            getTotalFragmentSize(fragment, max_fragment_id),
+            inverter->Statistics()->getMaxByteCount());
+
+        return false;
+    }
+
     // Move all fragments into target buffer
     uint8_t offs = 0;
     inverter->Statistics()->clearBuffer();

lib/Hoymiles/src/parser/StatisticsParser.cpp

@@ -34,6 +34,25 @@ void StatisticsParser::setByteAssignment(const byteAssign_t* byteAssignment, uin
     _byteAssignmentSize = size;
 }
 
+uint8_t StatisticsParser::getMaxByteCount()
+{
+    static uint8_t maxByteCount = 0;
+
+    // Use already calculated value
+    if (maxByteCount > 0) {
+        return maxByteCount;
+    }
+
+    for (uint8_t i = 0; i < _byteAssignmentSize; i++) {
+        if (_byteAssignment[i].div == CMD_CALC) {
+            continue;
+        }
+        maxByteCount = max<uint8_t>(maxByteCount, _byteAssignment[i].start + _byteAssignment[i].num);
+    }
+
+    return maxByteCount;
+}
+
 void StatisticsParser::clearBuffer()
 {
     memset(_payloadStatistic, 0, STATISTIC_PACKET_SIZE);

lib/Hoymiles/src/parser/StatisticsParser.h

@@ -109,6 +109,9 @@ public:
 
     void setByteAssignment(const byteAssign_t* byteAssignment, uint8_t size);
 
+    // Returns 1 based amount of expected bytes of statistic data
+    uint8_t getMaxByteCount();
+
     const byteAssign_t* getAssignmentByChannelField(ChannelType_t type, ChannelNum_t channel, FieldId_t fieldId);
     fieldSettings_t* getSettingByChannelField(ChannelType_t type, ChannelNum_t channel, FieldId_t fieldId);