diff --git a/include/config.h b/include/config.h
index 1ae480c..dbb78fb 100644
--- a/include/config.h
+++ b/include/config.h
@@ -60,9 +60,9 @@ static const ConfigDef configdefs[] = {
     {"key5long", ConfigType::BYTE, uint8_t(15)},
     {"key6", ConfigType::BYTE, uint8_t(6)},
     {"key6long", ConfigType::BYTE,  uint8_t(16)},
-    {"n2kDestA", ConfigType::STRING, String("")},
-    {"n2kDestB", ConfigType::STRING, String("")},
-    {"n2kDestC", ConfigType::STRING, String("")},
+    {"n2kDestA", ConfigType::STRING, String("none")},
+    {"n2kDestB", ConfigType::STRING, String("none")},
+    {"n2kDestC", ConfigType::STRING, String("none")},
     {"envInterval", ConfigType::SHORT, int16_t(5)},
 
     // no user access
diff --git a/src/webserver.cpp b/src/webserver.cpp
index a639e1f..9fafef5 100644
--- a/src/webserver.cpp
+++ b/src/webserver.cpp
@@ -99,7 +99,7 @@ void webserver_init() {
     });
 
     server.on("/api/config", HTTP_GET, [](AsyncWebServerRequest *request) {
-        StaticJsonDocument<512> doc;
+        StaticJsonDocument<1024> doc;
         doc["systemName"] = config.getString("systemName");
         doc["systemMode"] = String(config.getChar("systemMode"));
         doc["logLevel"] = loglevel;
@@ -130,6 +130,9 @@ void webserver_init() {
         doc["key4long"] = longcode[BUTTON_4];
         doc["key5long"] = longcode[BUTTON_5];
         doc["key6long"] = longcode[BUTTON_6];
+        doc["n2kDestA"] = config.getString("n2kDestA");
+        doc["n2kDestB"] = config.getString("n2kDestB");
+        doc["n2kDestC"] = config.getString("n2kDestC");
         doc["envInterval"] = config.getShort("envInterval");
         String out;
         serializeJson(doc, out);
@@ -230,7 +233,7 @@ void webserver_init() {
         AsyncResponseStream *response = request->beginResponseStream("application/json");
         response->print("[");
         bool first = true;
-        for (int i = 0; i <= 252; i++) {
+        for (uint8_t i = 0; i <= 252; i++) {
             const tNMEA2000::tDevice *d = pN2kDeviceList->FindDeviceBySource(i);
             if (d == nullptr) {
                 continue;
@@ -244,8 +247,36 @@ void webserver_init() {
                 first = false;
             }
             // TODO last seen?
-            response->printf("{\"source\":%d,\"name\":\"%s\",\"manuf\":\"%d\",\"model\":\"%s\"}",
-                             i, hex_name, d->GetManufacturerCode(), d->GetModelID());
+            uint16_t mfcode = d->GetManufacturerCode();
+            // TODO RAW-String!
+            response->printf("{\"source\":%d,\"name\":\"%s\",\"manufcode\":\"%d\",\"model\":\"%s\",\"manufname\":\"%s\"}",
+                             i, hex_name, mfcode, d->GetModelID(), NMEA2000.GetManufacturerName(mfcode));
+        }
+        response->print("]");
+        request->send(response);
+    });
+
+    server.on("/api/dyndevlist", HTTP_GET, [](AsyncWebServerRequest *request) {
+        // NMEA2000 dynmic config list: devices
+        AsyncResponseStream *response = request->beginResponseStream("application/json");
+        response->print("[");
+        bool first = true;
+        for (uint8_t i = 0; i <= 252; i++) {
+            const tNMEA2000::tDevice *d = pN2kDeviceList->FindDeviceBySource(i);
+            if (d == nullptr) {
+                continue;
+            }
+            uint64_t NAME = d->GetName(); 
+            char hex_name[17];
+            snprintf(hex_name, sizeof(hex_name), "%08X%08X", (uint32_t)(NAME >> 32), (uint32_t)(NAME & 0xFFFFFFFF));
+            if (!first) {
+                response->print(",");
+            } else {
+                first = false;
+            }
+            uint16_t mfcode = d->GetManufacturerCode();
+            response->printf(R"DELIM({"v":"%s","l":"%s - %s (%d)"})DELIM",
+                             hex_name, d->GetModelID(), NMEA2000.GetManufacturerName(mfcode), mfcode);
         }
         response->print("]");
         request->send(response);
diff --git a/web/config.json b/web/config.json
index 953c4ad..8d4dd48 100644
--- a/web/config.json
+++ b/web/config.json
@@ -54,6 +54,20 @@
     "description": "A password for configuration modifications is required.",
     "category": "System"
 },
+{
+    "name": "instDesc1",
+    "label": "Description 1",
+    "type": "string",
+    "description": "NMEA2000 installation description 1",
+    "category": "System"
+},
+{
+    "name": "instDesc2",
+    "label": "Description 2",
+    "type": "string",
+    "description": "NMEA2000 installation description 2",
+    "category": "System"
+},
 {
     "name": "apEnable",
     "label": "Enable AP",
@@ -120,8 +134,8 @@
     "type": "number",
     "default": 64,
     "min": 0,
-    "max": 255,
-    "description": "The brightness of the destination leds (0..255).",
+    "max": 4095,
+    "description": "The brightness of the destination leds (0..4095).",
     "category": "Hardware"
 },
 {
@@ -130,8 +144,8 @@
     "type": "number",
     "default": 64,
     "min": 0,
-    "max": 255,
-    "description": "The brightness of the rgb status led (0..255).",
+    "max": 4095,
+    "description": "The brightness of the rgb status led (0..4095).",
     "category": "Hardware"
 },
 {
@@ -281,8 +295,8 @@
     "name": "n2kDestA",
     "label": "Destination A",
     "type": "dynlist",
-    "source": "devicelist",
-    "interval": "5000",
+    "source": "dyndevlist",
+    "interval": "30000",
     "description": "Destination device A",
     "category": "NMEA2000"
 },
@@ -290,8 +304,8 @@
     "name": "n2kDestB",
     "label": "Destination B",
     "type": "dynlist",
-    "source": "devicelist",
-    "interval": "5000",
+    "source": "dyndevlist",
+    "interval": "30000",
     "description": "Destination device B",
     "category": "NMEA2000"
 },
@@ -299,8 +313,8 @@
     "name": "n2kDestC",
     "label": "Destination C",
     "type": "dynlist",
-    "source": "devicelist",
-    "interval": "5000",
+    "source": "dyndevlist",
+    "interval": "30000",
     "description": "Destination device C",
     "category": "NMEA2000"
 },
@@ -312,7 +326,7 @@
     "check": "checkMinMax",
     "min": 1,
     "max": 300,
-    "description": "interval seconds to send environment data [1..300]",
+    "description": "interval in seconds to send environment data [1..300]",
     "category": "NMEA2000"
 }
 ]
diff --git a/web/index.html b/web/index.html
index 8b75af6..6b595c9 100644
--- a/web/index.html
+++ b/web/index.html
@@ -104,11 +104,11 @@ if (!window.isSecureContext) {
     </div>
   </div>
 
-  <div class="deviceForm tabPage hidden" id="devicePage">
+  <div class="tabPage hidden" id="devicePage">
     <div class="buttons">
       <button id="reloadDevices">Reload</button>
     </div>
-    <div class="deviceFormRows">
+    <div class="deviceListRows" id="deviceList">
 
     </div>
   </div>
diff --git a/web/index.js b/web/index.js
index 8c1d442..978b1eb 100644
--- a/web/index.js
+++ b/web/index.js
@@ -10,6 +10,7 @@
     let buttonHandlers = {};
     let checkers = {};
     let userFormatters = {};
+    let dynLists = {}; // dynamic selection lists
     let apiPrefix = "";
     function addEl(type, clazz, parent, text) {
         let el = document.createElement(type);
@@ -131,6 +132,12 @@
                     resetForm();
                 }
             })
+        // check if any dynamic list needs update
+        for (let l in dynLists) {
+            if (loadDynList(l)) {
+                updateDynLists(l, configDefinitions)
+            }
+        }
     }
     function resetForm(ev) {
         getJson(apiPrefix + "/api/config")
@@ -614,6 +621,12 @@
             })
             return el;
         }
+        if (configItem.type === 'dynlist') {
+            el = addEl('select', clazz, frame);
+            if (configItem.readOnly) el.setAttribute('disabled', true);
+            el.setAttribute('name', configItem.name);
+            return el;
+        }
         if (configItem.type === 'filter') {
             return createFilterInput(configItem, frame, clazz);
         }
@@ -834,6 +847,50 @@
         return rt;
     }
 
+    function loadDynList(apiname) {
+        // returns true if list was loaded
+        // TODO 
+        // - implement generic all/none or static entries from config.json
+        // - check if current list is updated, so later dom refresh is not needed
+        let now = (new Date()).getTime();
+        if (now - dynLists[apiname].timestamp < dynLists[apiname].interval) {
+            // console.log("loading dynamic list: update interval not reached")
+            return false;
+        }
+        // console.log("loading dynamic list: " + apiname)
+        getJson("api/"+apiname)
+            .then(function(list) {
+                dynLists[apiname].timestamp = (new Date()).getTime();
+                dynLists[apiname].updated = true
+                dynLists[apiname].data = []
+                dynLists[apiname].data.push({"l": "all devices (broadcast)", "v": "all"})
+                dynLists[apiname].data.push({"l": "disabled (none)", "v": "none"})
+                for (let i in list) {
+                    // let l = list[i].model + " - " + list[i].manufname  + " (" + list[i].manufcode + ")"
+                    // dynLists[apiname].data.push({"l": l, "v": list[i].name})
+                    dynLists[apiname].data.push({"l": list[i].l, "v": list[i].v})
+                }
+            })
+            .catch(function (err) { 
+                alert("unable to load dynamic list: " + err) 
+                return false
+            })
+        return true
+    }
+
+    function updateDynLists(listname, defs) {
+        for (i in defs) {
+            if ((defs[i].type === "dynlist") && (defs[i].source === listname)) {
+                let el = document.querySelector("[name='" + defs[i].name + "']");
+                // TODO append here static list from configdefinition
+                // if defs[i] has key "list" then prepend  it
+                // let options = 
+                // options += dynLists[listname].data
+                updateSelectList(el, dynLists[listname].data, true)
+            }
+        }
+    }
+
     function createConfigDefinitions(parent, capabilities, defs) {
         let categories = {};
         let frame = parent.querySelector('.configFormRows');
@@ -843,6 +900,22 @@
         let currentCategoryPopulated = true;
         defs.forEach(function (item) {
             if (!item.type || item.category === undefined) return;
+            // look for dynamic lists
+            if (item.type === 'dynlist') {
+                if (item.source in dynLists) {
+                    // check if interval is smaller as already defined 
+                    if (item.interval < dynLists[item.source].interval) {
+                        dynLists[item.source].interval = item.interval;
+                    }
+                } else {
+                    // define new dynamic list
+                    dynLists[item.source] = {
+                        interval: item.interval,
+                        updated: true
+                    };
+                    loadDynList(item.source);
+                }
+            }
             let catEntry;
             if (categories[item.category] === undefined) {
                 catEntry = {
@@ -974,10 +1047,32 @@
             .catch(function (err) { alert("unable to load config: " + err) })
     }
     function loadDeviceList() {
-        getJson("api/devices")
+        getJson("api/devicelist")
             .then(function(devices) {
-                let deviceForm = document.getElementById('devicePage');
-                 console.log("Device form called");
+                let deviceList = document.getElementById('deviceList');
+                let row;
+                let el;
+                let even = true;
+                let n = 0
+                deviceList.replaceChildren();
+                for (let d in devices) {
+                    row = addEl('div', even ? 'row even' : 'row', deviceList);
+                    el = addEl('span', 'label', row);
+                    el.innerHTML = devices[d].name;
+                    el = addEl('span', 'value', row);
+                    el.innerHTML = devices[d].model;
+                    el.innerHTML += " - " + devices[d].manufname;
+                    el.innerHTML += " (" + devices[d].manufcode+ "): "
+                    el.innerHTML += devices[d].source
+                    even = ! even;
+                    n += 1;
+                }
+                addEl('hr', '', deviceList);
+                row = addEl('div', even ? 'row even' : 'row', deviceList);
+                el = addEl('span', 'label', row);
+                el.innerHTML = "total devices";
+                el = addEl('span', 'value', row);
+                el.innerHTML = n;
             })
             .catch(function (err) { alert("unable to load devicelist: " + err) })
     }
@@ -1097,7 +1192,7 @@
         });
     }
     buttonHandlers.reloadDevices=function() {
-        console.log("Button reload devices");
+        loadDeviceList()
     }
     function handleTab(el) {
         let activeName = el.getAttribute('data-page');
@@ -1664,6 +1759,7 @@
                     })
             })
         })
+        loadDeviceList();
     });
 }());