diff --git a/extra_script.py b/extra_script.py
index c5ba779..ea5a8f7 100644
--- a/extra_script.py
+++ b/extra_script.py
@@ -108,6 +108,44 @@ def mergeConfig(base,other):
                 base=base+merge
     return base
 
+def replaceTexts(data,replacements):
+    if replacements is None:
+        return data
+    if isinstance(data,str):
+        for k,v in replacements.items():
+            data=data.replace("$"+k,str(v))
+        return data
+    if isinstance(data,list):
+        rt=[]
+        for e in data:
+            rt.append(replaceTexts(e,replacements))
+        return rt
+    if isinstance(data,dict):   
+        rt={} 
+        for k,v in data.items():
+            rt[replaceTexts(k,replacements)]=replaceTexts(v,replacements)
+        return rt
+    return data
+def expandConfig(config):
+    rt=[]
+    for item in config:
+        type=item.get('type')
+        if type != 'array':
+            rt.append(item)
+            continue
+        replacements=item.get('replace')
+        children=item.get('children')
+        name=item.get('name')
+        if name is None:
+            name="#unknown#"
+        if not isinstance(replacements,list):
+            raise Exception("missing replacements at array %s"%name)
+        for replace in replacements:
+            if children is not None:
+                for c in children:
+                    rt.append(replaceTexts(c,replace))
+    return rt
+
 def generateMergedConfig(inFile,outFile,addDirs=[]):
     if not os.path.exists(inFile):
         raise Exception("unable to read cfg file %s"%inFile)
@@ -115,6 +153,7 @@ def generateMergedConfig(inFile,outFile,addDirs=[]):
     with open(inFile,'rb') as ch:    
         config=json.load(ch)
         config=mergeConfig(config,addDirs)
+        config=expandConfig(config)
         data=json.dumps(config,indent=2)
         writeFileIfChanged(outFile,data)
 
diff --git a/lib/iictask/GwIicTask.cpp b/lib/iictask/GwIicTask.cpp
index 1bbfdb4..f0f16ac 100644
--- a/lib/iictask/GwIicTask.cpp
+++ b/lib/iictask/GwIicTask.cpp
@@ -3,7 +3,12 @@
 #ifdef _GWIIC
     #include <Wire.h>
 #endif
-#ifdef GWSHT3X
+#if defined(GWSHT3X) || defined(GWSHT3X1) || defined(GWSHT3X2) || defined(GWSHT3X2) || defined(GWSHT3X4)
+    #define _GWSHT3X
+#else
+    #undef _GWSHT3X
+#endif
+#ifdef _GWSHT3X
     #include "SHT3X.h"
 #endif
 #ifdef GWQMP6988
@@ -16,7 +21,6 @@
 #ifdef GWBME280
     #include <Adafruit_BME280.h>
 #endif
-//#define GWSHT3X -1
 
 #ifndef GWIIC_SDA
     #define GWIIC_SDA -1
@@ -29,14 +33,14 @@
     cfg->getValue(name, GwConfigDefinitions::prefix ## name)
 
 #define CSHT3X(name) \
-    CFG_GET(config,name,SHT3X)
+    CFG_GET(config,name,SHT3X1)
 #define CQMP6988(name) \
-    CFG_GET(config,name,QMP6988)
+    CFG_GET(config,name,QMP69881)
 #define CBME280(name) \
-    CFG_GET(config,name,BME280)    
+    CFG_GET(config,name,BME2801)    
 class SHT3XConfig{
     public:
-    const String prefix="SHT3X";
+    const String prefix="SHT3X1";
     String tmNam;
     String huNam;
     int iid;
@@ -60,7 +64,7 @@ class SHT3XConfig{
 
 class QMP6988Config{
     public:
-        const String prefix="QMP6988";
+        const String prefix="QMP69881";
         String prNam="Pressure";
         int iid=99;
         bool prAct=true;
@@ -79,7 +83,7 @@ class QMP6988Config{
 
 class BME280Config{
     public:
-    const String prefix="BME280";
+    const String prefix="BME2801";
     bool prAct=true;
     bool tmAct=true;
     bool huAct=true;
diff --git a/lib/iictask/config.json b/lib/iictask/config.json
index 15df8f3..e462303 100644
--- a/lib/iictask/config.json
+++ b/lib/iictask/config.json
@@ -1,433 +1,508 @@
 [
     {
-        "name": "SHT3XtmAct",
-        "label": "SHT3X Temp",
-        "type": "boolean",
-        "default": "true",
-        "description": "Enable the I2C SHT3x temp sensor",
-        "category": "sensors",
-        "capabilities": {
-            "SHT3X":"true"
-        }
+        "type": "array",
+        "name": "SHT3X",
+        "replace": [
+            {
+                "b": "1",
+                "i": "1",
+                "n": "99"
+            },
+            {
+                "b": "1",
+                "i": "2",
+                "n": "98"
+            },
+            {
+                "b": "2",
+                "i": "1",
+                "n": "109"
+            }
+
+        ],
+        "children": [
+            {
+                "name": "SHT3X$itmAct",
+                "label": "SHT3X$i Temp",
+                "type": "boolean",
+                "default": "true",
+                "description": "Enable the $i. I2C SHT3x temp sensor (bus $b)",
+                "category": "iicsensors$b",
+                "capabilities": {
+                    "SHT3X$i": "true"
+                }
+            },
+            {
+                "name": "SHT3X$itmSrc",
+                "label": "SHT3X$i Temp Type",
+                "type": "list",
+                "default": "2",
+                "description": "the NMEA2000 source type for the temperature",
+                "list": [
+                    {
+                        "l": "SeaTemperature",
+                        "v": "0"
+                    },
+                    {
+                        "l": "OutsideTemperature",
+                        "v": "1"
+                    },
+                    {
+                        "l": "InsideTemperature",
+                        "v": "2"
+                    },
+                    {
+                        "l": "EngineRoomTemperature",
+                        "v": "3"
+                    },
+                    {
+                        "l": "MainCabinTemperature",
+                        "v": "4"
+                    },
+                    {
+                        "l": "LiveWellTemperature",
+                        "v": "5"
+                    },
+                    {
+                        "l": "BaitWellTemperature",
+                        "v": "6"
+                    },
+                    {
+                        "l": "RefridgerationTemperature",
+                        "v": "7"
+                    },
+                    {
+                        "l": "HeatingSystemTemperature",
+                        "v": "8"
+                    },
+                    {
+                        "l": "DewPointTemperature",
+                        "v": "9"
+                    },
+                    {
+                        "l": "ApparentWindChillTemperature",
+                        "v": "10"
+                    },
+                    {
+                        "l": "TheoreticalWindChillTemperature",
+                        "v": "11"
+                    },
+                    {
+                        "l": "HeatIndexTemperature",
+                        "v": "12"
+                    },
+                    {
+                        "l": "FreezerTemperature",
+                        "v": "13"
+                    },
+                    {
+                        "l": "ExhaustGasTemperature",
+                        "v": "14"
+                    },
+                    {
+                        "l": "ShaftSealTemperature",
+                        "v": "15"
+                    }
+                ],
+                "category": "iicsensors$b",
+                "capabilities": {
+                    "SHT3X$i": "true"
+                }
+            },
+            {
+                "name": "SHT3X$ihuAct",
+                "label": "SHT3X$i Humidity",
+                "type": "boolean",
+                "default": "true",
+                "description": "Enable the $i. I2C SHT3x humidity sensor (bus $b)",
+                "category": "iicsensors$b",
+                "capabilities": {
+                    "SHT3X$i": "true"
+                }
+            },
+            {
+                "name": "SHT3X$ihuSrc",
+                "label": "SHT3X$i Humid Type",
+                "list": [
+                    {
+                        "l": "OutsideHumidity",
+                        "v": "1"
+                    },
+                    {
+                        "l": "Undef",
+                        "v": "0xff"
+                    }
+                ],
+                "category": "iicsensors$b",
+                "capabilities": {
+                    "SHT3X": "true"
+                }
+            },
+            {
+                "name": "SHT3X$iiid",
+                "label": "SHT3X$i N2K iid",
+                "type": "number",
+                "default": "$n",
+                "description": "the N2K instance id for the $i. SHT3X Temperature and Humidity ",
+                "category": "iicsensors$b",
+                "min": 0,
+                "max": 253,
+                "check": "checkMinMax",
+                "capabilities": {
+                    "SHT3X$i": "true"
+                }
+            },
+            {
+                "name": "SHT3X$iintv",
+                "label": "SHT3X$i Interval",
+                "type": "number",
+                "default": 2,
+                "description": "Interval(s) to query SHT3X Temperature and Humidity (1...300)",
+                "category": "iicsensors$b",
+                "min": 1,
+                "max": 300,
+                "check": "checkMinMax",
+                "capabilities": {
+                    "SHT3X$i": "true"
+                }
+            },
+            {
+                "name": "SHT3X$itmNam",
+                "label": "SHT3X$i Temp XDR",
+                "type": "String",
+                "default": "Temp$i",
+                "description": "set the XDR transducer name for the $i. SHT3X Temperature, leave empty to disable NMEA0183 XDR ",
+                "category": "iicsensors$b",
+                "capabilities": {
+                    "SHT3X$i": "true"
+                }
+            },
+            {
+                "name": "SHT3X$ihuNam",
+                "label": "SHT3X$i Humid XDR",
+                "type": "String",
+                "default": "Humidity$i",
+                "description": "set the XDR transducer name for the $i. SHT3X Humidity, leave empty to disable NMEA0183 XDR",
+                "category": "iicsensors$b",
+                "capabilities": {
+                    "SHT3X$i": "true"
+                }
+            }
+        ]
     },
     {
-        "name": "SHT3XtmSrc",
-        "label": "SHT3X Temp Type",
-        "type": "list",
-        "default": "2",
-        "description": "the NMEA2000 source type for the temperature",
-        "list": [
+        "type": "array",
+        "name": "QMP6988",
+        "replace": [
             {
-                "l": "SeaTemperature",
-                "v": "0"
+                "b": "1",
+                "i": "1",
+                "n": "97"
             },
             {
-                "l": "OutsideTemperature",
-                "v": "1"
-            },
-            {
-                "l": "InsideTemperature",
-                "v": "2"
-            },
-            {
-                "l": "EngineRoomTemperature",
-                "v": "3"
-            },
-            {
-                "l": "MainCabinTemperature",
-                "v": "4"
-            },
-            {
-                "l": "LiveWellTemperature",
-                "v": "5"
-            },
-            {
-                "l": "BaitWellTemperature",
-                "v": "6"
-            },
-            {
-                "l": "RefridgerationTemperature",
-                "v": "7"
-            },
-            {
-                "l": "HeatingSystemTemperature",
-                "v": "8"
-            },
-            {
-                "l": "DewPointTemperature",
-                "v": "9"
-            },
-            {
-                "l": "ApparentWindChillTemperature",
-                "v": "10"
-            },
-            {
-                "l": "TheoreticalWindChillTemperature",
-                "v": "11"
-            },
-            {
-                "l": "HeatIndexTemperature",
-                "v": "12"
-            },
-            {
-                "l": "FreezerTemperature",
-                "v": "13"
-            },
-            {
-                "l": "ExhaustGasTemperature",
-                "v": "14"
-            },
-            {
-                "l": "ShaftSealTemperature",
-                "v": "15"
+                "b": "1",
+                "i": "2",
+                "n": "96"
             }
         ],
-        "category": "sensors",
-        "capabilities": {
-            "SHT3X":"true"
-        }
+        "children": [
+            {
+                "name": "QMP6988$iprAct",
+                "label": "QMP6988-$i pressure",
+                "description": "activate the $i. QMP6988 pressure measurement (bus $b)",
+                "type": "boolean",
+                "default": "true",
+                "category": "iicsensors$b",
+                "capabilities": {
+                    "QMP6988$i": "true"
+                }
+            },
+            {
+                "name": "QMP6988$iiid",
+                "label": "QMP6988-$i N2K iid",
+                "type": "number",
+                "default": "$n",
+                "description": "the N2K instance id for the $i. QMP6988 pressure",
+                "category": "iicsensors$b",
+                "min": 0,
+                "max": 253,
+                "check": "checkMinMax",
+                "capabilities": {
+                    "QMP6988$i": "true"
+                }
+            },
+            {
+                "name": "QMP6988$iintv",
+                "label": "QMP6988-$i Interval",
+                "type": "number",
+                "default": 2,
+                "description": "Interval(s) to query the $i. QMP6988 Pressure (1...300)",
+                "category": "iicsensors$b",
+                "min": 1,
+                "max": 300,
+                "check": "checkMinMax",
+                "capabilities": {
+                    "QMP6988$i": "true"
+                }
+            },
+            {
+                "name": "QMP6988$iprNam",
+                "label": "QMP6988-$i Pressure XDR",
+                "type": "String",
+                "default": "Pressure$i",
+                "description": "set the XDR transducer name for the $i. QMP6988 Pressure, leave empty to disable NMEA0183 XDR",
+                "category": "iicsensors$b",
+                "capabilities": {
+                    "QMP6988$i": "true"
+                }
+            },
+            {
+                "name": "QMP6988$iprOff",
+                "label": "QMP6988-$i Pressure Offset",
+                "type": "number",
+                "description": "offset (in pa) to be added to the $i. QMP6988 pressure measurements",
+                "default": "0",
+                "category": "iicsensors$b",
+                "capabilities": {
+                    "QMP6988$i": "true"
+                }
+            }
+        ]
     },
     {
-        "name": "SHT3XhuAct",
-        "label": "SHT3X Humidity",
-        "type": "boolean",
-        "default": "true",
-        "description": "Enable the I2C SHT3x humidity sensor",
-        "category": "sensors",
-        "capabilities": {
-            "SHT3X":"true"
-        }
-    },
-    {
-        "name": "SHT3XhuSrc",
-        "label": "SHT3X Humid Type",
-        "list":[
-            {"l":"OutsideHumidity","v":"1"},
-            {"l":"Undef","v":"0xff"}  
-        ],
-        "category": "sensors",
-        "capabilities": {
-            "SHT3X":"true"
-        }
-    },
-    {
-        "name": "SHT3Xiid",
-        "label": "SHT3X N2K iid",
-        "type": "number",
-        "default": 99,
-        "description": "the N2K instance id for the SHT3X Temperature and Humidity ",
-        "category": "sensors",
-        "min": 0,
-        "max": 253,
-        "check": "checkMinMax",
-        "capabilities": {
-            "SHT3X":"true"
-        }
-    },
-    {
-        "name": "SHT3Xintv",
-        "label": "SHT3X Interval",
-        "type": "number",
-        "default": 2,
-        "description": "Interval(s) to query SHT3X Temperature and Humidity (1...300)",
-        "category": "sensors",
-        "min": 1,
-        "max": 300,
-        "check": "checkMinMax",
-        "capabilities": {
-            "SHT3X":"true"
-        }
-    },
-    {
-        "name": "SHT3XtmNam",
-        "label": "SHT3X Temp XDR",
-        "type": "String",
-        "default": "Temp",
-        "description": "set the XDR transducer name for the SHT3X Temperature, leave empty to disable NMEA0183 XDR ",
-        "category": "sensors",
-        "capabilities": {
-            "SHT3X":"true"
-        }
-    },
-    {
-        "name": "SHT3XhuNam",
-        "label": "SHT3X Humid XDR",
-        "type": "String",
-        "default": "Humidity",
-        "description": "set the XDR transducer name for the SHT3X Humidity, leave empty to disable NMEA0183 XDR",
-        "category": "sensors",
-        "capabilities": {
-            "SHT3X":"true"
-        }
-    },
-    {
-        "name": "QMP6988prAct",
-        "label": "QMP6988 pressure",
-        "description": "activate the QMP6988 pressure measurement",
-        "type":"boolean",
-        "default":"true",
-        "category": "sensors",
-        "capabilities": {
-            "QMP6988":"true"
-        }
-    },
-    {
-        "name": "QMP6988iid",
-        "label": "QMP6988 N2K iid",
-        "type": "number",
-        "default": 99,
-        "description": "the N2K instance id for the QMP6988 pressure",
-        "category": "sensors",
-        "min": 0,
-        "max": 253,
-        "check": "checkMinMax",
-        "capabilities": {
-            "QMP6988":"true"
-        }
-    },
-    {
-        "name": "QMP6988intv",
-        "label": "QMP6988 Interval",
-        "type": "number",
-        "default": 2,
-        "description": "Interval(s) to query QMP6988 Pressure (1...300)",
-        "category": "sensors",
-        "min": 1,
-        "max": 300,
-        "check": "checkMinMax",
-        "capabilities": {
-            "QMP6988":"true"
-        }
-    },
-    {
-        "name": "QMP6988prNam",
-        "label": "QMP6988 Pressure XDR",
-        "type": "String",
-        "default": "Pressure",
-        "description": "set the XDR transducer name for the QMP6988 Pressure, leave empty to disable NMEA0183 XDR",
-        "category": "sensors",
-        "capabilities": {
-            "QMP6988":"true"
-        }
-    },
-    {
-        "name":"QMP6988prOff",
-        "label":"QMP6988 Pressure Offset",
-        "type": "number",
-        "description": "offset (in pa) to be added to the QMP6988 pressure measurements",
-        "default":"0",
-        "category": "sensors",
-        "capabilities": {
-            "QMP6988":"true"
-        }
-    },
-    {
-        "name": "BME280tmAct",
-        "label": "BME280 Temp",
-        "type": "boolean",
-        "default": "true",
-        "description": "Enable the I2C BME280 temp sensor",
-        "category": "sensors",
-        "capabilities": {
-            "BME280":"true"
-        }
-    },
-    {
-        "name": "BME280tmSrc",
-        "label": "BME280 Temp Type",
-        "type": "list",
-        "default": "2",
-        "description": "the NMEA2000 source type for the temperature",
-        "list": [
+        "type": "array",
+        "name": "BME280",
+        "replace": [
             {
-                "l": "SeaTemperature",
-                "v": "0"
+                "b": "1",
+                "i": "1",
+                "n": "95"
             },
             {
-                "l": "OutsideTemperature",
-                "v": "1"
-            },
-            {
-                "l": "InsideTemperature",
-                "v": "2"
-            },
-            {
-                "l": "EngineRoomTemperature",
-                "v": "3"
-            },
-            {
-                "l": "MainCabinTemperature",
-                "v": "4"
-            },
-            {
-                "l": "LiveWellTemperature",
-                "v": "5"
-            },
-            {
-                "l": "BaitWellTemperature",
-                "v": "6"
-            },
-            {
-                "l": "RefridgerationTemperature",
-                "v": "7"
-            },
-            {
-                "l": "HeatingSystemTemperature",
-                "v": "8"
-            },
-            {
-                "l": "DewPointTemperature",
-                "v": "9"
-            },
-            {
-                "l": "ApparentWindChillTemperature",
-                "v": "10"
-            },
-            {
-                "l": "TheoreticalWindChillTemperature",
-                "v": "11"
-            },
-            {
-                "l": "HeatIndexTemperature",
-                "v": "12"
-            },
-            {
-                "l": "FreezerTemperature",
-                "v": "13"
-            },
-            {
-                "l": "ExhaustGasTemperature",
-                "v": "14"
-            },
-            {
-                "l": "ShaftSealTemperature",
-                "v": "15"
+                "b": "1",
+                "i": "2",
+                "n": "94"
             }
         ],
-        "category": "sensors",
-        "capabilities": {
-            "BME280":"true"
-        }
-    },
-    {
-        "name":"BME280tmOff",
-        "label":"BME280 Temperature Offset",
-        "type": "number",
-        "description": "offset (in °) to be added to the BME280 temperature measurements",
-        "default":"0",
-        "category": "sensors",
-        "capabilities": {
-            "BME280":"true"
-        }
-    },
-    {
-        "name": "BME280huAct",
-        "label": "BME280 Humidity",
-        "type": "boolean",
-        "default": "true",
-        "description": "Enable the I2C BME280 humidity sensor",
-        "category": "sensors",
-        "capabilities": {
-            "BME280":"true"
-        }
-    },
-    {
-        "name": "BME280huSrc",
-        "label": "BME280 Humid Type",
-        "type": "list",
-        "description": "the NMEA2000 source type for the humidity",
-        "default": "0",
-        "list":[
-            {"l":"InsideHumidity","v":"0"},
-            {"l":"OutsideHumidity","v":"1"},
-            {"l":"Undef","v":"0xff"}  
-        ],
-        "category": "sensors",
-        "capabilities": {
-            "BME280":"true"
-        }
-    },
-    {
-        "name": "BME280prAct",
-        "label": "BME280 Pressure",
-        "type": "boolean",
-        "default": "true",
-        "description": "Enable the I2C BME280 pressure sensor",
-        "category": "sensors",
-        "capabilities": {
-            "BME280":"true"
-        }
-    },
-    {
-        "name":"BME280prOff",
-        "label":"BME280 Pressure Offset",
-        "type": "number",
-        "description": "offset (in pa) to be added to the BME280 pressure measurements",
-        "default":"0",
-        "category": "sensors",
-        "capabilities": {
-            "BME280":"true"
-        }
-    },
-    {
-        "name": "BME280iid",
-        "label": "BME280 N2K iid",
-        "type": "number",
-        "default": 99,
-        "description": "the N2K instance id for the BME280 Temperature and Humidity ",
-        "category": "sensors",
-        "min": 0,
-        "max": 253,
-        "check": "checkMinMax",
-        "capabilities": {
-            "BME280":"true"
-        }
-    },
-    {
-        "name": "BME280intv",
-        "label": "BME280 Interval",
-        "type": "number",
-        "default": 2,
-        "description": "Interval(s) to query BME280 Temperature and Humidity (1...300)",
-        "category": "sensors",
-        "min": 1,
-        "max": 300,
-        "check": "checkMinMax",
-        "capabilities": {
-            "BME280":"true"
-        }
-    },
-    {
-        "name": "BME280tmNam",
-        "label": "BME280 Temp XDR",
-        "type": "String",
-        "default": "Temp",
-        "description": "set the XDR transducer name for the BME280 Temperature, leave empty to disable NMEA0183 XDR ",
-        "category": "sensors",
-        "capabilities": {
-            "BME280":"true"
-        }
-    },
-    {
-        "name": "BME280huNam",
-        "label": "BME280 Humid XDR",
-        "type": "String",
-        "default": "Humidity",
-        "description": "set the XDR transducer name for the BME280 Humidity, leave empty to disable NMEA0183 XDR",
-        "category": "sensors",
-        "capabilities": {
-            "BME280":"true"
-        }
-    },
-    {
-        "name": "BME280prNam",
-        "label": "BME280 Pressure XDR",
-        "type": "String",
-        "default": "Pressure",
-        "description": "set the XDR transducer name for the BME280 Pressure, leave empty to disable NMEA0183 XDR",
-        "category": "sensors",
-        "capabilities": {
-            "BME280":"true"
-        }
+        "children": [
+            {
+                "name": "BME280$itmAct",
+                "label": "BME280-$i Temp",
+                "type": "boolean",
+                "default": "true",
+                "description": "Enable the $i. I2C BME280 temp sensor (bus $b)",
+                "category": "iicsensors$b",
+                "capabilities": {
+                    "BME280$i": "true"
+                }
+            },
+            {
+                "name": "BME280$itmSrc",
+                "label": "BME280-$i Temp Type",
+                "type": "list",
+                "default": "2",
+                "description": "the NMEA2000 source type for the temperature",
+                "list": [
+                    {
+                        "l": "SeaTemperature",
+                        "v": "0"
+                    },
+                    {
+                        "l": "OutsideTemperature",
+                        "v": "1"
+                    },
+                    {
+                        "l": "InsideTemperature",
+                        "v": "2"
+                    },
+                    {
+                        "l": "EngineRoomTemperature",
+                        "v": "3"
+                    },
+                    {
+                        "l": "MainCabinTemperature",
+                        "v": "4"
+                    },
+                    {
+                        "l": "LiveWellTemperature",
+                        "v": "5"
+                    },
+                    {
+                        "l": "BaitWellTemperature",
+                        "v": "6"
+                    },
+                    {
+                        "l": "RefridgerationTemperature",
+                        "v": "7"
+                    },
+                    {
+                        "l": "HeatingSystemTemperature",
+                        "v": "8"
+                    },
+                    {
+                        "l": "DewPointTemperature",
+                        "v": "9"
+                    },
+                    {
+                        "l": "ApparentWindChillTemperature",
+                        "v": "10"
+                    },
+                    {
+                        "l": "TheoreticalWindChillTemperature",
+                        "v": "11"
+                    },
+                    {
+                        "l": "HeatIndexTemperature",
+                        "v": "12"
+                    },
+                    {
+                        "l": "FreezerTemperature",
+                        "v": "13"
+                    },
+                    {
+                        "l": "ExhaustGasTemperature",
+                        "v": "14"
+                    },
+                    {
+                        "l": "ShaftSealTemperature",
+                        "v": "15"
+                    }
+                ],
+                "category": "iicsensors$b",
+                "capabilities": {
+                    "BME280$i": "true"
+                }
+            },
+            {
+                "name": "BME280$itmOff",
+                "label": "BME280-$i Temperature Offset",
+                "type": "number",
+                "description": "offset (in °) to be added to the BME280 temperature measurements",
+                "default": "0",
+                "category": "iicsensors$b",
+                "capabilities": {
+                    "BME280$i": "true"
+                }
+            },
+            {
+                "name": "BME280$ihuAct",
+                "label": "BME280-$i Humidity",
+                "type": "boolean",
+                "default": "true",
+                "description": "Enable the $i. I2C BME280 humidity sensor",
+                "category": "iicsensors$b",
+                "capabilities": {
+                    "BME280$i": "true"
+                }
+            },
+            {
+                "name": "BME280$ihuSrc",
+                "label": "BME280-$i Humid Type",
+                "type": "list",
+                "description": "the NMEA2000 source type for the humidity",
+                "default": "0",
+                "list": [
+                    {
+                        "l": "InsideHumidity",
+                        "v": "0"
+                    },
+                    {
+                        "l": "OutsideHumidity",
+                        "v": "1"
+                    },
+                    {
+                        "l": "Undef",
+                        "v": "0xff"
+                    }
+                ],
+                "category": "iicsensors$b",
+                "capabilities": {
+                    "BME280$i": "true"
+                }
+            },
+            {
+                "name": "BME280$iprAct",
+                "label": "BME280-$i Pressure",
+                "type": "boolean",
+                "default": "true",
+                "description": "Enable the $i. I2C BME280 pressure sensor (bus $b)",
+                "category": "iicsensors$b",
+                "capabilities": {
+                    "BME280$i": "true"
+                }
+            },
+            {
+                "name": "BME280$iprOff",
+                "label": "BME280 Pressure Offset",
+                "type": "number",
+                "description": "offset (in pa) to be added to the BME280 pressure measurements",
+                "default": "0",
+                "category": "iicsensors$b",
+                "capabilities": {
+                    "BME280$i": "true"
+                }
+            },
+            {
+                "name": "BME280$iiid",
+                "label": "BME280-$i N2K iid",
+                "type": "number",
+                "default": "$n",
+                "description": "the N2K instance id for the BME280 Temperature and Humidity ",
+                "category": "iicsensors$b",
+                "min": 0,
+                "max": 253,
+                "check": "checkMinMax",
+                "capabilities": {
+                    "BME280$i": "true"
+                }
+            },
+            {
+                "name": "BME280$iintv",
+                "label": "BME280-$i Interval",
+                "type": "number",
+                "default": 2,
+                "description": "Interval(s) to query BME280 Temperature and Humidity (1...300)",
+                "category": "iicsensors$b",
+                "min": 1,
+                "max": 300,
+                "check": "checkMinMax",
+                "capabilities": {
+                    "BME280$i": "true"
+                }
+            },
+            {
+                "name": "BME280$itmNam",
+                "label": "BME280-$i Temp XDR",
+                "type": "String",
+                "default": "BTemp$i",
+                "description": "set the XDR transducer name for the BME280 Temperature, leave empty to disable NMEA0183 XDR ",
+                "category": "iicsensors$b",
+                "capabilities": {
+                    "BME280$i": "true"
+                }
+            },
+            {
+                "name": "BME280$ihuNam",
+                "label": "BME280-$i Humid XDR",
+                "type": "String",
+                "default": "BHumidity$i",
+                "description": "set the XDR transducer name for the BME280 Humidity, leave empty to disable NMEA0183 XDR",
+                "category": "iicsensors$b",
+                "capabilities": {
+                    "BME280$i": "true"
+                }
+            },
+            {
+                "name": "BME280$iprNam",
+                "label": "BME280-$i Pressure XDR",
+                "type": "String",
+                "default": "BPressure$i",
+                "description": "set the XDR transducer name for the BME280 Pressure, leave empty to disable NMEA0183 XDR",
+                "category": "iicsensors$b",
+                "capabilities": {
+                    "BME280$i": "true"
+                }
+            }
+        ]
     }
-]
+]
\ No newline at end of file
diff --git a/web/index.js b/web/index.js
index f1ec95d..31ec3f9 100644
--- a/web/index.js
+++ b/web/index.js
@@ -1020,9 +1020,7 @@ function toggleClass(el,id,classList){
 }
 
 function createConfigDefinitions(parent, capabilities, defs,includeXdr) {
-    let category;
-    let categoryEl;
-    let categoryFrame;
+    let categories={};
     let frame = parent.querySelector('.configFormRows');
     if (!frame) throw Error("no config form");
     frame.innerHTML = '';
@@ -1035,23 +1033,25 @@ function createConfigDefinitions(parent, capabilities, defs,includeXdr) {
         }
         else{
             if(includeXdr) return;
-        } 
-        if (item.category != category || !categoryEl) {
-            if (categoryFrame && ! currentCategoryPopulated){
-                categoryFrame.remove();
+        }
+        let catEntry;
+        if (categories[item.category] === undefined){
+            catEntry={
+                populated:false,
+                frame: undefined,
+                element: undefined
             }
-            currentCategoryPopulated=false;
-            categoryFrame = addEl('div', 'category', frame);
-            categoryFrame.setAttribute('data-category',item.category)
-            let categoryTitle = addEl('div', 'title', categoryFrame);
+            categories[item.category]=catEntry
+            catEntry.frame = addEl('div', 'category', frame);
+            catEntry.frame.setAttribute('data-category',item.category)
+            let categoryTitle = addEl('div', 'title', catEntry.frame);
             let categoryButton = addEl('span', 'icon icon-more', categoryTitle);
             addEl('span', 'label', categoryTitle, item.category);
             addEl('span','categoryAdd',categoryTitle);
-            categoryEl = addEl('div', 'content', categoryFrame);
-            categoryEl.classList.add('hidden');
-            let currentEl = categoryEl;
+            catEntry.element = addEl('div', 'content', catEntry.frame);
+            catEntry.element.classList.add('hidden');
             categoryTitle.addEventListener('click', function (ev) {
-                let rs = currentEl.classList.toggle('hidden');
+                let rs = catEntry.element.classList.toggle('hidden');
                 if (rs) {
                     toggleClass(categoryButton,0,moreicons);
                 }
@@ -1059,7 +1059,9 @@ function createConfigDefinitions(parent, capabilities, defs,includeXdr) {
                     toggleClass(categoryButton,1,moreicons);
                 }
             })
-            category = item.category;
+        }
+        else{
+            catEntry=categories[item.category];
         }
         let showItem=true;
         let itemCapabilities=item.capabilities||{};
@@ -1089,8 +1091,8 @@ function createConfigDefinitions(parent, capabilities, defs,includeXdr) {
         }
         if (showItem) {
             item.readOnly=readOnly;
-            currentCategoryPopulated=true;
-            let row = addEl('div', 'row', categoryEl);
+            catEntry.populated=true;
+            let row = addEl('div', 'row', catEntry.element);
             let label = item.label || item.name;
             addEl('span', 'label', row, label);
             let valueFrame = addEl('div', 'value', row);
@@ -1136,8 +1138,11 @@ function createConfigDefinitions(parent, capabilities, defs,includeXdr) {
             });
         }
     });
-    if (categoryFrame && ! currentCategoryPopulated){
-        categoryFrame.remove();
+    for (let cat in categories){
+        let catEntry=categories[cat];
+        if (! catEntry.populated){
+            catEntry.frame.remove();
+        }
     }
 }
 function loadConfigDefinitions() {