also set water temperature (MTW) from PGN 130312 - with condition

lib/config/GwConverterConfig.h

@@ -70,6 +70,7 @@ class GwConverterConfig{
       int min2KInterval=50;
       int rmcInterval=1000;
       int rmcCheckTime=4000;
+      int winst312=256;
       std::vector<WindMapping> windMappings;
       void init(GwConfigHandler *config, GwLog*logger){
         minXdrInterval=config->getInt(GwConfigDefinitions::minXdrInterval,100);
@@ -82,6 +83,7 @@ class GwConverterConfig{
         rmcInterval=config->getInt(GwConfigDefinitions::sendRMCi,1000);
         if (rmcInterval < 0) rmcInterval=0;
         if (rmcInterval > 0 && rmcInterval <100) rmcInterval=100;
+        winst312=config->getInt(GwConfigDefinitions::winst312,256);
         for (auto && it:windConfigs){
           String cfg=config->getString(it.second);
           WindMapping mapping(it.first,cfg);

lib/nmea2kto0183/N2kDataToNMEA0183.cpp

@@ -1344,7 +1344,6 @@ private:
               return;
 
             SendMessage(NMEA0183Msg);
-            i++;
         }
 
         GwXDRFoundMapping mapping=xdrMappings->getMapping(XDRTEMP,TempSource,0,0);
@@ -1379,6 +1378,21 @@ private:
            LOG_DEBUG(GwLog::DEBUG,"unable to parse PGN %d",msg.PGN);
            return;
         }
+        if (TemperatureSource == N2kts_SeaTemperature && 
+            (config.winst312 == TemperatureInstance || config.winst312 == 256)) {
+          updateDouble(boatData->WTemp, Temperature);
+          tNMEA0183Msg NMEA0183Msg;
+
+          if (!NMEA0183Msg.Init("MTW", talkerId))
+              return;
+          if (!NMEA0183Msg.AddDoubleField(KelvinToC(Temperature)))
+              return;
+          if (!NMEA0183Msg.AddStrField("C"))
+              return;
+
+            SendMessage(NMEA0183Msg);
+        }
+
         GwXDRFoundMapping mapping=xdrMappings->getMapping(XDRTEMP,(int)TemperatureSource,0,TemperatureInstance);
         if (updateDouble(&mapping,Temperature)){
             LOG_DEBUG(GwLog::DEBUG+1,"found temperature mapping %s",mapping.definition->toString().c_str());

web/config.json

@@ -228,6 +228,46 @@
         "check": "checkMinMax",
         "category": "converter"
     },
+    {
+        "name": "timeouts",
+        "type": "array",
+        "replace": [
+            {
+                "n": "Default",
+                "d": "4000",
+                "l": "default",
+                "t": "NMEA"
+            },
+            {
+                "n": "Sensor",
+                "d": "60000",
+                "l": "sensor",
+                "t": "sensor"
+            },
+            {
+                "n": "Long",
+                "d": "32000",
+                "l": "long",
+                "t": "special NMEA"
+            },
+            {
+                "n": "Ais",
+                "d": "120000",
+                "l": "ais",
+                "t": "ais"
+            }
+        ],
+        "children": [
+            {
+                "name": "timo$n",
+                "label": "timeout $l",
+                "default": "$d",
+                "type": "number",
+                "description": "data timeouts(ms) for $t data",
+                "category": "converter"
+            }
+        ]
+    },
     {
         "name": "stbRudderI",
         "label":"stb rudder instance",
@@ -305,44 +345,15 @@
         ]
     },
     {
-        "name": "timeouts",
+        "name": "winst312",
-        "type": "array",
+        "label": "130312 WTemp iid",
-        "replace":[
-            {
-                "n":"Default",
-                "d":"4000",
-                "l": "default",
-                "t": "NMEA"
-            },
-            {
-                "n":"Sensor",
-                "d":"60000",
-                "l": "sensor",
-                "t": "sensor"
-            },
-            {
-                "n":"Long",
-                "d":"32000",
-                "l": "long",
-                "t": "special NMEA"
-            },
-            {
-                "n":"Ais",
-                "d":"120000",
-                "l": "ais",
-                "t": "ais"
-            }
-        ],
-        "children":[
-            {
-            "name":"timo$n",
-            "label":"timeout $l",
-            "default": "$d",
         "type": "number",
-            "description": "data timeouts(ms) for $t data",
+        "check": "checkMinMax",
+        "min": -1,
+        "max": 256,
+        "description": "the temp instance of PGN 130312 used for water temperature, use -1 for none, 256 for any",
+        "default": "256",
         "category":"converter"
-            }
-        ]
     },
     {
         "name": "usbActisense",