Remember coretemp quality state between messages, reset temp to zero if not set (#4602)

Part of #4207

src/ANT/ANTChannel.cpp

@@ -904,7 +904,6 @@ void ANTChannel::broadcastEvent(unsigned char *ant_message)
 
         case CHANNEL_TYPE_CORETEMP:
         {
-            // Quality alternates messages so will need to remember last quality message
             // only use core temp if data is 'good' or better (just use >0 for now)
             if ( antMessage.coreTemp > 0 )
             {

src/ANT/ANTMessage.cpp

@@ -621,12 +621,15 @@ ANTMessage::ANTMessage(ANT *parent, const unsigned char *message) {
 
             case ANTChannel::CHANNEL_TYPE_CORETEMP:
             {
+                static int tmpQual=0;
                 switch (data_page)
                 {
                 case 0:
-                    tempQual = (message[6]&0x3);
+                    // Quality only on intermittent messages so need to remember last quality message
+                    tmpQual = (message[6]&0x3);
                     break;
                 case 1:
+                    tempQual = tmpQual;
                     uint16_t val=(message[7]+((message[8] & 0xf0)<<4));
                     if (val>0 && val != 0x800) 
                         skinTemp = val/20.0;

src/Train/RealtimeData.cpp

@@ -45,6 +45,7 @@ RealtimeData::RealtimeData()
     trainerConfigRequired = false;
     trainerBrakeFault = false;
     memset(spinScan, 0, 24);
+    temp = 0.0;
 }
 
 void RealtimeData::setName(char *name)
@@ -530,7 +531,7 @@ double RealtimeData::value(DataSeries series) const
 
     case Temp: return temp;
         break;
-        
+
     case CoreTemp: return coreTemp;
         break;