diff --git a/mongoose.c b/mongoose.c
index 0d4f7fc5..d36f3aee 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -124,6 +124,14 @@ fail:
 #define MG_NO_CACHE_HEADERS "Cache-Control: no-cache\r\n"
 #define MG_JSON_HEADERS "Content-Type: application/json\r\n" MG_NO_CACHE_HEADERS
 
+struct mg_dash_user {
+  struct mg_dash_user *next;
+  char name[32];    // User name
+  char token[21];   // Login token
+  int level;        // Access level
+  uint64_t expire;  // Expiration timestamp
+};
+
 struct mg_upload_state {
   char marker;      // Tells that we're a file upload connection
   size_t expected;  // POST data length, bytes
@@ -277,8 +285,10 @@ static int mg_dash_parse_field(struct mg_str json, struct mg_field *f) {
     ok = mg_json_get_bool(json, json_path, (bool *) f->value);
   } else if (f->type == MG_VAL_INT) {
     double d;
-    ok = mg_json_get_num(json, json_path, &d);
-    if (ok) *(int *) f->value = (int) d;
+    if (mg_json_get_num(json, json_path, &d) && d == (int) d) {
+      *(int *) f->value = (int) d;
+      ok = true;
+    }
   } else if (f->type == MG_VAL_DBL) {
     ok = mg_json_get_num(json, json_path, (double *) f->value);
   } else if (f->type == MG_VAL_STR) {
@@ -294,24 +304,25 @@ static int mg_dash_apply(struct mg_connection *c, struct mg_dash *dash,
                          struct mg_str json) {
   struct mg_str key, val;
   size_t ofs = 0;
-  int count = 0;
-  // struct mg_field *f = NULL;
+  int total_count = 0;
   while ((ofs = mg_json_next(json, ofs, &key, &val)) > 0) {
     struct mg_field_set *set = mg_dash_find_field_set(dash, trimq(key));
+    int count = 0;
     if (set != NULL) {
       size_t i;
       for (i = 0; set->fields[i].name != NULL; i++) {
         if (mg_dash_parse_field(val, &set->fields[i])) count++;
       }
-      if (count > 0) {
+      if (count) {
         if (set->writer) set->writer();
         mg_dash_send_change(c->mgr, set);
+        total_count += count;
       }
     } else {
       MG_ERROR(("UNKNOWN SET: [%.*s]", key.len, key.buf));
     }
   }
-  return count;
+  return total_count;
 }
 
 static void mg_dash_process_msg(struct mg_connection *c,
@@ -405,8 +416,8 @@ static void file_ev_handler(struct mg_connection *c, int ev, void *ev_data) {
         mg_http_reply(c, 500, NULL, "File upload error %d\n", errno);
       } else {
         mg_dash_file_add(hm->uri, hm->body.len);
-        MG_DEBUG(("Starting upload, [%.*s] %lu", hm->uri.len, hm->uri.buf,
-                  hm->body.len));
+        MG_DEBUG(("%lu Starting upload, [%.*s] %lu", c->id, hm->uri.len,
+                  hm->uri.buf, hm->body.len));
         us->marker = 'U';
         us->expected = hm->body.len;
         us->received = 0;
@@ -429,7 +440,7 @@ static void file_ev_handler(struct mg_connection *c, int ev, void *ev_data) {
     c->recv.len = 0;
     if (us->received >= us->expected) {
       fclose((FILE *) us->ctx);
-      MG_DEBUG(("Uploaded %lu", us->expected));
+      MG_DEBUG(("%lu Uploaded %lu", c->id, us->expected));
       mg_http_reply(c, 200, NULL, "%lu uploaded\n", us->expected);
       mg_dash_send_change(c->mgr, &set_files);
       memset(us, 0, sizeof(*us));
@@ -438,6 +449,91 @@ static void file_ev_handler(struct mg_connection *c, int ev, void *ev_data) {
   }
 }
 
+static uint64_t mg_dash_make_expiration_time(struct mg_dash *dash) {
+  unsigned t = (unsigned) dash->session_auto_expiration_seconds;
+  if (t == 0) t = 3600;  // Default expiration time in seconds
+  return mg_millis() + t * 1000;
+}
+
+// Parse HTTP requests, return authenticated user or NULL
+static struct mg_dash_user *mg_dash_authenticate(struct mg_http_message *hm,
+                                                 struct mg_dash *dash) {
+  static struct mg_dash_user *s_users;  // List of authenticated users
+  char user[100], pass[100];
+  struct mg_dash_user *u, *tmp, *result = NULL;
+
+  if (dash->authenticate == NULL) return NULL;
+  mg_http_creds(hm, user, sizeof(user), pass, sizeof(pass));
+
+  // Remove expired users
+  for (u = s_users; u != NULL; u = tmp) {
+    tmp = u->next;
+    if (u->expire < mg_millis()) {
+      MG_DEBUG(("Deleting expired auth %s/%d %llu %u", u->name, u->level,
+                u->expire, mg_millis() - u->expire));
+      LIST_DELETE(struct mg_dash_user, &s_users, u);
+    }
+  }
+
+  if (pass[0] != '\0') {
+    struct mg_str *ah = mg_http_get_header(hm, "Authorization");
+    if (ah != NULL) {
+      // Auth header and password are set, auth by user/password via glue API
+      int num_users = 0, level = dash->authenticate(user, pass);
+      MG_DEBUG(("user %s, level: %d", user, level));
+      if (level > 0) {  // Proceed only if the firmware authenticated us
+        for (u = s_users; u != NULL && result == NULL;
+             u = u->next, num_users++) {
+          if (strcmp(user, u->name) == 0) {
+            u->expire = mg_dash_make_expiration_time(dash);
+            result = u;
+          }
+        }
+        // Not yet authenticated, add to the list
+        if (result == NULL && num_users < 10) {
+          result = (struct mg_dash_user *) mg_calloc(1, sizeof(*result));
+          mg_snprintf(result->name, sizeof(result->name), "%s", user);
+          mg_random_str(result->token, sizeof(result->token) - 1);
+          result->level = level, result->next = s_users, s_users = result;
+          result->expire = mg_dash_make_expiration_time(dash);
+        }
+      }
+    } else if (ah == NULL) {
+      for (u = s_users; u != NULL && result == NULL; u = u->next) {
+        if (strcmp(u->token, pass) == 0) {
+          u->expire = mg_dash_make_expiration_time(dash);
+          result = u;
+        }
+      }
+    }
+  }
+
+  // MG_DEBUG(("[%s/%s] -> %s", user, pass, result ? "OK" : "FAIL"));
+  return result;
+}
+
+static void mg_handle_login(struct mg_connection *c, struct mg_dash_user *u) {
+  char cookie[256];
+  mg_snprintf(cookie, sizeof(cookie),
+              "Set-Cookie: access_token=%s; Path=/; "
+              "%sHttpOnly; SameSite=Lax; Max-Age=%d\r\n%s",
+              u->token, c->is_tls ? "Secure; " : "", 3600 * 24,
+              MG_JSON_HEADERS);
+  mg_http_reply(c, 200, cookie, "{%m:%m,%m:%d}\n",  //
+                MG_ESC("user"), MG_ESC(u->name),    //
+                MG_ESC("level"), u->level);
+}
+
+static void mg_handle_logout(struct mg_connection *c) {
+  char cookie[256];
+  mg_snprintf(cookie, sizeof(cookie),
+              "Set-Cookie: access_token=; Path=/; "
+              "Expires=Thu, 01 Jan 1970 00:00:00 UTC; "
+              "%sHttpOnly; Max-Age=0; \r\n",
+              c->is_tls ? "Secure; " : "");
+  mg_http_reply(c, 401, cookie, "Unauthorized\n");
+}
+
 void mg_dash_ev_handler(struct mg_connection *c, int ev, void *ev_data) {
   struct mg_dash *dash = (struct mg_dash *) c->fn_data;
   if (ev == MG_EV_OPEN) {
@@ -446,9 +542,24 @@ void mg_dash_ev_handler(struct mg_connection *c, int ev, void *ev_data) {
     }
   } else if (ev == MG_EV_HTTP_MSG) {
     struct mg_http_message *hm = (struct mg_http_message *) ev_data;
+    struct mg_dash_user *u = mg_dash_authenticate(hm, dash);
     struct mg_str parts[5];
     memset(parts, 0, sizeof(parts));
-    if (mg_match(hm->uri, mg_str("/api/websocket"), NULL)) {
+
+    MG_DEBUG(("%lu %p %s", c->id, u, u ? u->name : ""));
+
+    if (mg_match(hm->uri, mg_str("/api/hi"), NULL)) {
+      mg_http_reply(c, 200, MG_JSON_HEADERS, "hi\n");
+    } else if (mg_match(hm->uri, mg_str("/api/logout"), NULL)) {
+      mg_handle_logout(c);
+      mg_ws_printf(c, WEBSOCKET_OP_TEXT, "{%m:%m}", MG_ESC("method"),
+                   MG_ESC("logout"));
+    } else if (mg_match(hm->uri, mg_str("/api/login"), NULL) && u != NULL) {
+      mg_handle_login(c, u);
+    } else if (dash->authenticate && u == NULL &&
+               mg_match(hm->uri, mg_str("/api/#"), NULL)) {
+      mg_http_reply(c, 403, MG_JSON_HEADERS, "Not Authorised\n");
+    } else if (mg_match(hm->uri, mg_str("/api/websocket"), NULL)) {
       mg_ws_upgrade(c, hm, NULL);
     } else if (mg_match(hm->uri, mg_str("/files/#"), NULL)) {
       file_ev_handler(c, ev, ev_data);
@@ -481,8 +592,7 @@ void mg_dash_ev_handler(struct mg_connection *c, int ev, void *ev_data) {
     for (fs = dash->sets; fs != NULL; fs = fs->next) {
       mg_dash_send_change(c->mgr, fs);
     }
-    // Send change notification with no params to indicate we're done for now
-    mg_dash_broadcast(c->mgr, "{%m:%m}", MG_ESC("method"), MG_ESC("change"));
+    mg_dash_broadcast(c->mgr, "{%m:%m}", MG_ESC("method"), MG_ESC("ready"));
   } else if (ev == MG_EV_WS_MSG) {
     // Add this to automatically handle "get" and "set" JSON-RPC calls
     struct mg_ws_message *wm = (struct mg_ws_message *) ev_data;
diff --git a/mongoose.h b/mongoose.h
index febf140b..aedd407b 100644
--- a/mongoose.h
+++ b/mongoose.h
@@ -3193,6 +3193,8 @@ struct mg_dash_file {
 struct mg_dash {
   struct mg_field_set *sets;
   struct mg_dash_custom_handler *custom_handlers;
+  int (*authenticate)(const char *user, const char *pass);
+  int session_auto_expiration_seconds;
   //struct mg_dash_file *files;
 };
 
diff --git a/resources/dashboard.js b/resources/dashboard.js
index 1feb05c3..2775e2c4 100644
--- a/resources/dashboard.js
+++ b/resources/dashboard.js
@@ -5,7 +5,7 @@
 
   const Rpc = (function() {
     function Rpc(url, onev) {
-      let ws, id = 1, oncall, q = [];
+      let ws, id = 1, oncall, q = [], reconnect = true;
       const pending = new Map();
       const realsend = s => { ws.send(s); onev && onev('send', s); };
       const fail = e => { for (const p of pending.values()) p[1](e || 'disconnected'); pending.clear(); };
@@ -15,7 +15,7 @@
       const connect = () => {
         ws = new WebSocket(url);
         ws.onopen = () => { onev && onev('open'); while (q.length) realsend(JSON.stringify(q.shift())); };
-        ws.onclose = () => { onev && onev('close'); fail(); setTimeout(connect, 1000); };
+        ws.onclose = () => { onev && onev('close'); fail(); reconnect && setTimeout(connect, 1000); };
         ws.onmessage = e => {
           onev && onev('message', e.data);
           let m;
@@ -43,6 +43,7 @@
 
       connect();
       return {
+        close: () => { reconnect = false; ws?.close(); },
         call: (method, params) => new Promise((ok, bad) => {
           const i = id++;
           pending.set(i, [ok, bad]);
@@ -57,16 +58,75 @@
     return Rpc;
   })();
 
+  function rpc_connect() {
+    if (isMock) {
+      setTimeout(() => userhandlers['ready']?.(), 500);
+      return;
+    }
+    if (rpc) return rpc;
+    //if (settings.auth && !status.authed) return null;
+    rpc = Rpc('api/websocket', function (evname, args) {
+      if (evname == 'open') status.online = true, rescan();
+      if (evname == 'close') status.online = false, rescan();
+      if (settings.debug) console.log('WS', evname, args);
+    });
+    rpc.handle((method, args) => {
+      if (method == 'change' && args) apply_and_rescan(settings.data, args);
+      if (method == 'logout') rpc_disconnect();
+      if (userhandlers[method]) userhandlers[method](args);
+    });
+    return rpc;
+  }
+
+  function rpc_disconnect() {
+    if (!rpc) return;
+    rpc.close();
+    rpc = null;
+    status.online = false;
+  }
+
+
+  function login(params) {
+    if (isMock) { rpc_connect(); return Promise.resolve({}); }
+    const opts = {};
+    if (params) {
+      const username = (params?.username ?? '').trim();
+      const password = params?.password ?? '';
+      const join = username + ':' + password;
+      opts.headers = { Authorization: `Basic ${btoa(join)}` };
+    }
+    return fetch('api/login', opts)
+      .then(r => r.ok ? r.json() : r.text().then(t => Promise.reject(t || r.statusText)))
+      .then(resp => {
+        status.username = resp?.user || '';
+        status.userlevel = resp?.level || 0;
+        //status.authed = !!status.username;
+        //if (settings.auth && status.authed) {
+        rpc_connect();
+        //rescan();
+        return resp;
+      });
+  };
+
+  function logout() {
+    if (isMock) { rpc_disconnect(); return Promise.resolve({}); }
+    return fetch('api/logout')
+      .catch(() => true)
+      .then(() => {
+        status.username = '';
+        status.userlevel = 0;
+        rpc_disconnect();
+        rescan();
+        return true;
+      });
+  }
+
   if (global.Dashboard) return;
-  const isMock = !!window.frameElement || (window !== window.top);
+  const isMock = location.protocol === 'file:' || !!window.frameElement || (window !== window.top);
   const settings = {data: {}, edits: {}, debug: true};
   const userhandlers = {}; // User event handlers
-  const status = { online: true, username: '', userlevel: 0, lastseen: '', initialized: false };
-  const rpc = isMock ? null : Rpc('api/websocket', function (evname, args) {
-    if (evname == 'open') status.online = true, rescan();
-    if (evname == 'close') status.online = false, rescan();
-    if (settings.debug) console.log('WS', evname, args);
-  });
+  const status = { online: true, username: '', userlevel: 0, lastseen: '', ready: false };
+  let rpc = null;
 
   const fromPath = (path, value) => path.split('.').reverse().reduce((acc, k) => ({ [k]: acc }), value);
   const get = (obj, path) => path.split('.').reduce((o, k) => o?.[k], obj);
@@ -327,40 +387,10 @@
     userhandlers[name] = fn;
   };
 
-  const setbody = visibility => document.body.style.visibility = visibility;
-
   function init(conf) {
     apply_and_rescan(settings, conf);
-    if (rpc) {
-      rpc.handle((method, args) => {
-        if (method == 'change') {
-          // "initialized" means that the device has sent us all initial
-          // data change notifications, and our settings.data contain
-          // actual refreshed device data - not the UI mock
-          if (!args) {
-            setbody('visible');
-            status.initialized = true;
-          }
-          if (args) apply_and_rescan(settings.data, args);
-        }
-        if (method != 'change') console.log('UNKNOWN REQUEST', method, args);
-        if (userhandlers[method]) userhandlers[method](args);
-      });
-      // After init, fetch all device data
-      //rpc.call('get').then(r => apply_and_rescan(settings.data, r));
-    } else {
-      setTimeout(function() { 
-        status.initialized = true;
-        setbody('visible');
-      }, 500);
-    }
+    if (!settings.auth) rpc_connect();
   };
 
-  if (document.readyState === "loading") {
-    document.addEventListener("DOMContentLoaded", () => setbody('hidden'), { once: true });
-  } else {
-    setbody('hidden');
-  }
-
-  global.Dashboard = { init, call, on, status };
+  global.Dashboard = { init, call, on, status, login, logout };
 })(window);
diff --git a/src/dash.c b/src/dash.c
index 23008c02..62d4947e 100644
--- a/src/dash.c
+++ b/src/dash.c
@@ -3,6 +3,14 @@
 #define MG_NO_CACHE_HEADERS "Cache-Control: no-cache\r\n"
 #define MG_JSON_HEADERS "Content-Type: application/json\r\n" MG_NO_CACHE_HEADERS
 
+struct mg_dash_user {
+  struct mg_dash_user *next;
+  char name[32];    // User name
+  char token[21];   // Login token
+  int level;        // Access level
+  uint64_t expire;  // Expiration timestamp
+};
+
 struct mg_upload_state {
   char marker;      // Tells that we're a file upload connection
   size_t expected;  // POST data length, bytes
@@ -156,8 +164,10 @@ static int mg_dash_parse_field(struct mg_str json, struct mg_field *f) {
     ok = mg_json_get_bool(json, json_path, (bool *) f->value);
   } else if (f->type == MG_VAL_INT) {
     double d;
-    ok = mg_json_get_num(json, json_path, &d);
-    if (ok) *(int *) f->value = (int) d;
+    if (mg_json_get_num(json, json_path, &d) && d == (int) d) {
+      *(int *) f->value = (int) d;
+      ok = true;
+    }
   } else if (f->type == MG_VAL_DBL) {
     ok = mg_json_get_num(json, json_path, (double *) f->value);
   } else if (f->type == MG_VAL_STR) {
@@ -173,24 +183,25 @@ static int mg_dash_apply(struct mg_connection *c, struct mg_dash *dash,
                          struct mg_str json) {
   struct mg_str key, val;
   size_t ofs = 0;
-  int count = 0;
-  // struct mg_field *f = NULL;
+  int total_count = 0;
   while ((ofs = mg_json_next(json, ofs, &key, &val)) > 0) {
     struct mg_field_set *set = mg_dash_find_field_set(dash, trimq(key));
+    int count = 0;
     if (set != NULL) {
       size_t i;
       for (i = 0; set->fields[i].name != NULL; i++) {
         if (mg_dash_parse_field(val, &set->fields[i])) count++;
       }
-      if (count > 0) {
+      if (count) {
         if (set->writer) set->writer();
         mg_dash_send_change(c->mgr, set);
+        total_count += count;
       }
     } else {
       MG_ERROR(("UNKNOWN SET: [%.*s]", key.len, key.buf));
     }
   }
-  return count;
+  return total_count;
 }
 
 static void mg_dash_process_msg(struct mg_connection *c,
@@ -284,8 +295,8 @@ static void file_ev_handler(struct mg_connection *c, int ev, void *ev_data) {
         mg_http_reply(c, 500, NULL, "File upload error %d\n", errno);
       } else {
         mg_dash_file_add(hm->uri, hm->body.len);
-        MG_DEBUG(("Starting upload, [%.*s] %lu", hm->uri.len, hm->uri.buf,
-                  hm->body.len));
+        MG_DEBUG(("%lu Starting upload, [%.*s] %lu", c->id, hm->uri.len,
+                  hm->uri.buf, hm->body.len));
         us->marker = 'U';
         us->expected = hm->body.len;
         us->received = 0;
@@ -308,7 +319,7 @@ static void file_ev_handler(struct mg_connection *c, int ev, void *ev_data) {
     c->recv.len = 0;
     if (us->received >= us->expected) {
       fclose((FILE *) us->ctx);
-      MG_DEBUG(("Uploaded %lu", us->expected));
+      MG_DEBUG(("%lu Uploaded %lu", c->id, us->expected));
       mg_http_reply(c, 200, NULL, "%lu uploaded\n", us->expected);
       mg_dash_send_change(c->mgr, &set_files);
       memset(us, 0, sizeof(*us));
@@ -317,6 +328,91 @@ static void file_ev_handler(struct mg_connection *c, int ev, void *ev_data) {
   }
 }
 
+static uint64_t mg_dash_make_expiration_time(struct mg_dash *dash) {
+  unsigned t = (unsigned) dash->session_auto_expiration_seconds;
+  if (t == 0) t = 3600;  // Default expiration time in seconds
+  return mg_millis() + t * 1000;
+}
+
+// Parse HTTP requests, return authenticated user or NULL
+static struct mg_dash_user *mg_dash_authenticate(struct mg_http_message *hm,
+                                                 struct mg_dash *dash) {
+  static struct mg_dash_user *s_users;  // List of authenticated users
+  char user[100], pass[100];
+  struct mg_dash_user *u, *tmp, *result = NULL;
+
+  if (dash->authenticate == NULL) return NULL;
+  mg_http_creds(hm, user, sizeof(user), pass, sizeof(pass));
+
+  // Remove expired users
+  for (u = s_users; u != NULL; u = tmp) {
+    tmp = u->next;
+    if (u->expire < mg_millis()) {
+      MG_DEBUG(("Deleting expired auth %s/%d %llu %u", u->name, u->level,
+                u->expire, mg_millis() - u->expire));
+      LIST_DELETE(struct mg_dash_user, &s_users, u);
+    }
+  }
+
+  if (pass[0] != '\0') {
+    struct mg_str *ah = mg_http_get_header(hm, "Authorization");
+    if (ah != NULL) {
+      // Auth header and password are set, auth by user/password via glue API
+      int num_users = 0, level = dash->authenticate(user, pass);
+      MG_DEBUG(("user %s, level: %d", user, level));
+      if (level > 0) {  // Proceed only if the firmware authenticated us
+        for (u = s_users; u != NULL && result == NULL;
+             u = u->next, num_users++) {
+          if (strcmp(user, u->name) == 0) {
+            u->expire = mg_dash_make_expiration_time(dash);
+            result = u;
+          }
+        }
+        // Not yet authenticated, add to the list
+        if (result == NULL && num_users < 10) {
+          result = (struct mg_dash_user *) mg_calloc(1, sizeof(*result));
+          mg_snprintf(result->name, sizeof(result->name), "%s", user);
+          mg_random_str(result->token, sizeof(result->token) - 1);
+          result->level = level, result->next = s_users, s_users = result;
+          result->expire = mg_dash_make_expiration_time(dash);
+        }
+      }
+    } else if (ah == NULL) {
+      for (u = s_users; u != NULL && result == NULL; u = u->next) {
+        if (strcmp(u->token, pass) == 0) {
+          u->expire = mg_dash_make_expiration_time(dash);
+          result = u;
+        }
+      }
+    }
+  }
+
+  // MG_DEBUG(("[%s/%s] -> %s", user, pass, result ? "OK" : "FAIL"));
+  return result;
+}
+
+static void mg_handle_login(struct mg_connection *c, struct mg_dash_user *u) {
+  char cookie[256];
+  mg_snprintf(cookie, sizeof(cookie),
+              "Set-Cookie: access_token=%s; Path=/; "
+              "%sHttpOnly; SameSite=Lax; Max-Age=%d\r\n%s",
+              u->token, c->is_tls ? "Secure; " : "", 3600 * 24,
+              MG_JSON_HEADERS);
+  mg_http_reply(c, 200, cookie, "{%m:%m,%m:%d}\n",  //
+                MG_ESC("user"), MG_ESC(u->name),    //
+                MG_ESC("level"), u->level);
+}
+
+static void mg_handle_logout(struct mg_connection *c) {
+  char cookie[256];
+  mg_snprintf(cookie, sizeof(cookie),
+              "Set-Cookie: access_token=; Path=/; "
+              "Expires=Thu, 01 Jan 1970 00:00:00 UTC; "
+              "%sHttpOnly; Max-Age=0; \r\n",
+              c->is_tls ? "Secure; " : "");
+  mg_http_reply(c, 401, cookie, "Unauthorized\n");
+}
+
 void mg_dash_ev_handler(struct mg_connection *c, int ev, void *ev_data) {
   struct mg_dash *dash = (struct mg_dash *) c->fn_data;
   if (ev == MG_EV_OPEN) {
@@ -325,9 +421,24 @@ void mg_dash_ev_handler(struct mg_connection *c, int ev, void *ev_data) {
     }
   } else if (ev == MG_EV_HTTP_MSG) {
     struct mg_http_message *hm = (struct mg_http_message *) ev_data;
+    struct mg_dash_user *u = mg_dash_authenticate(hm, dash);
     struct mg_str parts[5];
     memset(parts, 0, sizeof(parts));
-    if (mg_match(hm->uri, mg_str("/api/websocket"), NULL)) {
+
+    MG_DEBUG(("%lu %p %s", c->id, u, u ? u->name : ""));
+
+    if (mg_match(hm->uri, mg_str("/api/hi"), NULL)) {
+      mg_http_reply(c, 200, MG_JSON_HEADERS, "hi\n");
+    } else if (mg_match(hm->uri, mg_str("/api/logout"), NULL)) {
+      mg_handle_logout(c);
+      mg_ws_printf(c, WEBSOCKET_OP_TEXT, "{%m:%m}", MG_ESC("method"),
+                   MG_ESC("logout"));
+    } else if (mg_match(hm->uri, mg_str("/api/login"), NULL) && u != NULL) {
+      mg_handle_login(c, u);
+    } else if (dash->authenticate && u == NULL &&
+               mg_match(hm->uri, mg_str("/api/#"), NULL)) {
+      mg_http_reply(c, 403, MG_JSON_HEADERS, "Not Authorised\n");
+    } else if (mg_match(hm->uri, mg_str("/api/websocket"), NULL)) {
       mg_ws_upgrade(c, hm, NULL);
     } else if (mg_match(hm->uri, mg_str("/files/#"), NULL)) {
       file_ev_handler(c, ev, ev_data);
@@ -360,8 +471,7 @@ void mg_dash_ev_handler(struct mg_connection *c, int ev, void *ev_data) {
     for (fs = dash->sets; fs != NULL; fs = fs->next) {
       mg_dash_send_change(c->mgr, fs);
     }
-    // Send change notification with no params to indicate we're done for now
-    mg_dash_broadcast(c->mgr, "{%m:%m}", MG_ESC("method"), MG_ESC("change"));
+    mg_dash_broadcast(c->mgr, "{%m:%m}", MG_ESC("method"), MG_ESC("ready"));
   } else if (ev == MG_EV_WS_MSG) {
     // Add this to automatically handle "get" and "set" JSON-RPC calls
     struct mg_ws_message *wm = (struct mg_ws_message *) ev_data;
diff --git a/src/dash.h b/src/dash.h
index ef2b4444..e92a1290 100644
--- a/src/dash.h
+++ b/src/dash.h
@@ -48,6 +48,8 @@ struct mg_dash_file {
 struct mg_dash {
   struct mg_field_set *sets;
   struct mg_dash_custom_handler *custom_handlers;
+  int (*authenticate)(const char *user, const char *pass);
+  int session_auto_expiration_seconds;
   //struct mg_dash_file *files;
 };
 
diff --git a/tutorials/device-dashboard/full/dashboard.c b/tutorials/device-dashboard/full/dashboard.c
index e02956e9..545271ff 100644
--- a/tutorials/device-dashboard/full/dashboard.c
+++ b/tutorials/device-dashboard/full/dashboard.c
@@ -162,6 +162,17 @@ static struct mg_field_set set_graph2 = {
     "graph2", fields_graph2, read_graph2, NULL, 0, 0, NULL,
 };
 
+static int authenticate(const char *user, const char *pass) {
+  int level = 0;  // Authentication failure
+  if (strcmp(pass, "admin") == 0) {
+    level = 7;  // Administrator
+  } else if (strcmp(pass, "user") == 0) {
+    level = 3;  // Ordinary dude
+  }
+  (void) user;
+  return level;
+}
+
 void mg_dash_init(struct mg_mgr *mgr) {
   static struct mg_dash dash;  // Important: keep it static!
 
@@ -176,6 +187,9 @@ void mg_dash_init(struct mg_mgr *mgr) {
   mg_dash_file_add(mg_str("device-config.json"), 1234);
   mg_dash_file_add(mg_str("device-log-2026-04-25.txt"), 1327854);
 
+  // Require authentication
+  dash.authenticate = authenticate;
+
   mg_http_listen(mgr, MG_HTTP_ADDR, mg_dash_ev_handler, &dash);
 }
 
diff --git a/tutorials/device-dashboard/full/dashboard.html b/tutorials/device-dashboard/full/dashboard.html
index 79f6076f..bfabe58d 100644
--- a/tutorials/device-dashboard/full/dashboard.html
+++ b/tutorials/device-dashboard/full/dashboard.html
@@ -4,10 +4,14 @@
     <title>My Dashboard</title>
 
     <!-- Mongoose device dashboard -->
+    <!--
     <script src="https://cdn.jsdelivr.net/gh/cesanta/mongoose@master/resources/dashboard.js"></script>
+    -->
+    <script src="dashboard.js"></script>
     <script>
       Dashboard.init({
         debug: true,
+        auth: true,
         data: {
           graph1: {data: []},
           graph2: {data: [], report: true},
@@ -22,6 +26,8 @@
 
     <script>
       document.addEventListener("DOMContentLoaded", () => {
+
+        // Tab switching
         const tabs = Array.from(document.querySelectorAll(".header-left .nav-link[href^='#']"));
         const panels = Array.from(document.querySelectorAll(".tab-panel"));
 
@@ -61,6 +67,54 @@
         const initialId = window.location.hash.slice(1) || "overview";
         activateTab(initialId);
 
+        // Auto logout on inactivity
+        function restartAutoLogout() {
+          const autologoutTimeoutSeconds = 300;
+          if (window.autoLogoutTimerId) clearTimeout(window.autoLogoutTimerId);
+          window.autoLogoutTimerId = setTimeout(() => {
+            Dashboard.logout().then(() => location.reload());
+          }, autologoutTimeoutSeconds * 1000);
+        };
+        function setupAutoLogout() {
+          ['mousemove', 'keydown', 'scroll', 'touchstart'].forEach(ev => {
+            document.addEventListener(ev, restartAutoLogout, true);
+          });
+          restartAutoLogout();
+        };
+
+        // Login page
+        const passwordEl = document.getElementById('login-password');
+        const loginButtonEl = document.getElementById('login-submit');
+        function showLogin(yes) {
+          document.getElementById('auth').style.display = yes ? '' : 'none';
+          document.getElementById('app').style.display = yes ? 'none' : '';
+          if (yes) {
+            document.body.style.visibility = 'visible';
+            passwordEl.focus();
+            passwordEl.onkeydown = function(ev) {
+              if (ev.key === 'Enter') {
+                ev.preventDefault();
+                loginButtonEl.click();
+              }
+            };
+          }
+        };
+
+        loginButtonEl.onclick = function(ev) {
+          ev.preventDefault();
+          const username = (document.getElementById('login-username')?.value || '').trim();
+          const password = passwordEl.value || '';
+          passwordEl.value = '';
+          Dashboard.login({username, password}).then(r => showLogin(false));
+        };
+
+        Dashboard.on('logout', function() { showLogin(true); });
+        Dashboard.on('ready', function() {
+          setupAutoLogout();
+          document.body.style.visibility = 'visible';
+        });
+        Dashboard.login().catch(err => showLogin(true));
+
         // GRAPHS
         // {stroke: '#14B8A6FF', fill: '#14B8A61A'}, // teal
         // {stroke: '#F59E0BFF', fill: '#F59E0B1A'}, // amber
@@ -216,7 +270,8 @@ a, a:visited, a:link { text-decoration: none; }
 .toggle:checked::after { transform: translateX(calc(100% - 3px)); }
 .toggle:disabled, .toggle.disabled { background: #d1d5db; cursor: not-allowed; }
 .toggle.edited { border-color: #0fe; }
-.u-over { top: 0 !important; }
+.u-under { top: 0 !important; }
+.hidden { display: none; }
 @media (max-width: 900px) { .grid { grid-template-columns: 1fr; } #files .row { flex-direction: column; flex-wrap: nowrap; } #files .panel, #files .note { flex: 1 1 auto; width: 100%; } }
 @media (max-width: 900px) { .metrics-grid { grid-template-columns: repeat(2, 1fr); } }
 @media (max-width: 480px) { .metrics-grid { grid-template-columns: 1fr; } .file-row { grid-template-columns: 1fr; } .file-actions { justify-content: flex-start; } .file-row { gap: 0.65rem; } .file-size { text-align: left; } }
@@ -229,129 +284,155 @@ a, a:visited, a:link { text-decoration: none; }
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   </head>
-  <body>
-    <div class="header">
-      <div class="header-container">
-        <div class="header-left">
-          <nav class="nav-tabs" role="tablist" aria-label="Primary tabs">
-            <svg class="logo" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600" width="1200" height="600">
-              <defs>
-                <linearGradient id="g" x1="0" y1="0" x2="1" y2="1">
-                  <stop offset="0%" stop-color="#2dd4bf"/>
-                  <stop offset="100%" stop-color="#0f766e"/>
-                </linearGradient>
-              </defs>
-              <g fill="none" stroke="url(#g)" stroke-width="30" stroke-linecap="round" stroke-linejoin="round">
-                <rect x="160" y="60" width="300" height="300" rx="70"/>
-                <rect x="20" y="200" width="300" height="300" rx="70"/>
-              </g>
-              <text x="560" y="360"
-                    font-family="system-ui, -apple-system, Segoe UI, Roboto, sans-serif"
-                    font-size="180"
-                    font-weight="600"
-                    fill="#6b7280">
-                MyLogo
-              </text>
-            </svg>
-            <a href="#overview" id="tab-overview" class="nav-link nav-link-active" role="tab" aria-controls="overview" aria-selected="true">
-              <svg viewBox="0 0 24 24" class="nav-icon" fill="none" stroke="currentColor" stroke-width="2">
-                <path d="M3 11.5 12 4l9 7.5" />
-                <path d="M5 10.5V20h14v-9.5" />
-              </svg>
-              Overview
-            </a>
-            <a href="#settings" id="tab-settings" class="nav-link" role="tab" aria-controls="settings" aria-selected="false" tabindex="-1">
-              <svg viewBox="0 0 24 24" class="nav-icon" fill="none" stroke="currentColor" stroke-width="2">
-                <circle cx="12" cy="12" r="3" />
-                <path d="M19.4 15a1.7 1.7 0 0 0 .34 1.87l.06.06a2 2 0 1 1-2.83 2.83l-.06-.06A1.7 1.7 0 0 0 15 19.4a1.7 1.7 0 0 0-1 .6 1.7 1.7 0 0 0-.4 1.1V21a2 2 0 1 1-4 0v-.1a1.7 1.7 0 0 0-.4-1.1 1.7 1.7 0 0 0-1-.6 1.7 1.7 0 0 0-1.87.34l-.06.06a2 2 0 1 1-2.83-2.83l.06-.06A1.7 1.7 0 0 0 4.6 15a1.7 1.7 0 0 0-.6-1 1.7 1.7 0 0 0-1.1-.4H2.8a2 2 0 1 1 0-4h.1a1.7 1.7 0 0 0 1.1-.4 1.7 1.7 0 0 0 .6-1 1.7 1.7 0 0 0-.34-1.87l-.06-.06a2 2 0 1 1 2.83-2.83l.06.06A1.7 1.7 0 0 0 9 4.6c.38-.16.72-.4 1-.7.26-.3.4-.69.4-1.1V2.8a2 2 0 1 1 4 0v.1c0 .41.14.8.4 1.1.28.3.62.54 1 .7a1.7 1.7 0 0 0 1.87-.34l.06-.06a2 2 0 1 1 2.83 2.83l-.06.06A1.7 1.7 0 0 0 19.4 9c.16.38.4.72.7 1 .3.26.69.4 1.1.4h.1a2 2 0 1 1 0 4h-.1a1.7 1.7 0 0 0-1.1.4 1.7 1.7 0 0 0-.7 1z" />
-              </svg>
-              Settings
-            </a>
-            <a href="#firmware" id="tab-firmware" class="nav-link" role="tab" aria-controls="firmware" aria-selected="false" tabindex="-1">
-              <svg viewBox="0 0 24 24" class="nav-icon" fill="none" stroke="currentColor" stroke-width="2">
-                <path d="M12 3v10" />
-                <path d="m8 9 4 4 4-4" />
-                <rect x="4" y="17" width="16" height="4" rx="2" />
-              </svg>
-              Firmware Update
-            </a>
-            <a href="#files" id="tab-files" class="nav-link" role="tab" aria-controls="files" aria-selected="false" tabindex="-1">
-              <svg viewBox="0 0 24 24" class="nav-icon" fill="none" stroke="currentColor" stroke-width="2">
-                <path d="M4 7a2 2 0 0 1 2-2h4l2 2h6a2 2 0 0 1 2 2v2H4Z" />
-                <path d="M4 11h16v7a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2Z" />
-                <path d="M8 15h8" />
-              </svg>
-              File Manager
-            </a>
-          </nav>
-          <div class="connection-badge connection-badge-${__status.online ? 'online' : 'offline'}" aria-label="connection active">
-            <span class="connection-label">${__status.online ? 'live' : 'offline'}</span>
-            <span class="connection-dot connection-dot-${__status.online ? 'online' : 'offline'}" aria-hidden="true"></span>
+  <body style="visibility: hidden;">
+    <section id="auth" style="display:none; min-height: 100vh; background: radial-gradient(900px 520px at 15% 0%, rgba(56, 189, 248, 0.18), rgba(56, 189, 248, 0)), radial-gradient(760px 460px at 85% 10%, rgba(45, 212, 191, 0.14), rgba(45, 212, 191, 0)), linear-gradient(180deg, #f8fafc, #def2f7);">
+      <div class="tab-stage" style="min-height: 100vh; display: flex; align-items: center; justify-content: center;">
+        <div class="panel" style="width: 100%; max-width: 28rem;">
+          <div class="panel-title">Dashboard Sign In</div>
+          <div class="panel-body" style="gap: 0.75rem;">
+            <form id="login-form" autocomplete="on" style="display: flex; flex-direction: column; gap: 0.75rem;">
+              <div class="field">
+                <label class="field-label" for="login-password">Password</label>
+                <input id="login-password" class="field-input" type="password" name="password" autocomplete="current-password" placeholder="••••••" />
+              </div>
+              <div id="login-error" class="note" aria-live="polite" style="display:none; background: #fee2e2; border-color: #fca5a5; color: #991b1b;"></div>
+              <div style="margin: 0; color: #999;">
+                Use "admin" or "user" to sign in.
+              </div>
+              <div style="display:flex; justify-content:flex-end;">
+                <button class="btn btn-primary" id="login-submit" type="submit">Login</button>
+              </div>
+            </form>
           </div>
         </div>
-        <div class="header-actions">
-          <nav class="nav-tabs">
-            <div class="nav-link">
-              <svg viewBox="0 0 24 24" class="nav-icon" fill="none" stroke="currentColor" stroke-width="2">
-                <path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2" />
-                <circle cx="12" cy="7" r="4" />
-              </svg>
-              <span>admin</span>
-              <svg viewBox="0 0 24 24" class="nav-icon" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
-                <path d="M9 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h4" />
-                <path d="M16 17l5-5-5-5" />
-                <path d="M21 12H9" />
-              </svg>
-            </div>
-          </nav>
-        </div>
       </div>
-    </div>
-    <main class="tab-stage">
-      <section id="overview" class="tab-panel tab-panel-active" role="tabpanel" aria-labelledby="tab-overview">
-        <div class="metrics-grid" aria-label="Device metrics overview">
-          <article class="metric-tile">
-            <div class="metric-label">Temperature</div>
-            <div class="metric-value-row">
-              <div class="metric-value">
-                <span class="metric-number" data-bind="metrics.temperature">24.8</span>
-                <span class="metric-unit">°C</span>
-              </div>
-              <span class="metric-status metric-status-good">ok</span>
-            </div>
-          </article>
-          <article class="metric-tile metric-tile-warning">
-            <div class="metric-label">CPU Load</div>
-            <div class="metric-value-row">
-              <div class="metric-value">
-                <span class="metric-number" data-bind="metrics.cpu">37</span>
-                <span class="metric-unit">%</span>
-              </div>
-              <span class="metric-status metric-status-warn">moderate</span>
-            </div>
-          </article>
-          <article class="metric-tile metric-tile-alert">
-            <div class="metric-label">Free Memory</div>
-            <div class="metric-value-row">
-              <div class="metric-value">
-                <span class="metric-number">${metrics.ram}</span>
-                <span class="metric-unit">KB</span>
-              </div>
-              <span class="metric-status metric-status-alert" style="${metrics.ram <= 30 ? '': 'display:none;'}">low</span>
-              <span class="metric-status metric-status-warn" style="${metrics.ram <= 50 && metrics.ram > 30 ? '': 'display:none;'}">ok-ish</span>
-            </div>
-          </article>
-          <article class="metric-tile">
-            <div class="metric-label">Volume</div>
-            <div class="metric-value-row">
-              <div class="metric-value">
-                <span class="metric-number" data-bind="settings.volume">18.7</span>
-                <span class="metric-unit">dB</span>
-              </div>
-              <span class="metric-status metric-status-good">ok</span>
-            </div>
-          </article>
-        </div>
+    </section>
+    <div id="app">
+   <div class="header">
+     <div class="header-container">
+       <div class="header-left">
+         <nav class="nav-tabs" role="tablist" aria-label="Primary tabs">
+           <svg class="logo" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600" width="1200" height="600">
+             <defs>
+               <linearGradient id="g" x1="0" y1="0" x2="1" y2="1">
+                 <stop offset="0%" stop-color="#2dd4bf"/>
+                 <stop offset="100%" stop-color="#0f766e"/>
+               </linearGradient>
+             </defs>
+             <g fill="none" stroke="url(#g)" stroke-width="30" stroke-linecap="round" stroke-linejoin="round">
+               <rect x="160" y="60" width="300" height="300" rx="70"/>
+               <rect x="20" y="200" width="300" height="300" rx="70"/>
+             </g>
+             <text x="560" y="360"
+                   font-family="system-ui, -apple-system, Segoe UI, Roboto, sans-serif"
+                   font-size="180"
+                   font-weight="600"
+                   fill="#6b7280">
+               MyLogo
+             </text>
+           </svg>
+           <a href="#overview" id="tab-overview" class="nav-link nav-link-active" role="tab" aria-controls="overview" aria-selected="true">
+             <svg viewBox="0 0 24 24" class="nav-icon" fill="none" stroke="currentColor" stroke-width="2">
+               <path d="M3 11.5 12 4l9 7.5" />
+               <path d="M5 10.5V20h14v-9.5" />
+             </svg>
+             Overview
+           </a>
+           <a href="#settings" id="tab-settings" class="nav-link" role="tab" aria-controls="settings" aria-selected="false" tabindex="-1">
+             <svg viewBox="0 0 24 24" class="nav-icon" fill="none" stroke="currentColor" stroke-width="2">
+               <circle cx="12" cy="12" r="3" />
+               <path d="M19.4 15a1.7 1.7 0 0 0 .34 1.87l.06.06a2 2 0 1 1-2.83 2.83l-.06-.06A1.7 1.7 0 0 0 15 19.4a1.7 1.7 0 0 0-1 .6 1.7 1.7 0 0 0-.4 1.1V21a2 2 0 1 1-4 0v-.1a1.7 1.7 0 0 0-.4-1.1 1.7 1.7 0 0 0-1-.6 1.7 1.7 0 0 0-1.87.34l-.06.06a2 2 0 1 1-2.83-2.83l.06-.06A1.7 1.7 0 0 0 4.6 15a1.7 1.7 0 0 0-.6-1 1.7 1.7 0 0 0-1.1-.4H2.8a2 2 0 1 1 0-4h.1a1.7 1.7 0 0 0 1.1-.4 1.7 1.7 0 0 0 .6-1 1.7 1.7 0 0 0-.34-1.87l-.06-.06a2 2 0 1 1 2.83-2.83l.06.06A1.7 1.7 0 0 0 9 4.6c.38-.16.72-.4 1-.7.26-.3.4-.69.4-1.1V2.8a2 2 0 1 1 4 0v.1c0 .41.14.8.4 1.1.28.3.62.54 1 .7a1.7 1.7 0 0 0 1.87-.34l.06-.06a2 2 0 1 1 2.83 2.83l-.06.06A1.7 1.7 0 0 0 19.4 9c.16.38.4.72.7 1 .3.26.69.4 1.1.4h.1a2 2 0 1 1 0 4h-.1a1.7 1.7 0 0 0-1.1.4 1.7 1.7 0 0 0-.7 1z" />
+             </svg>
+             Settings
+           </a>
+           <a href="#firmware" id="tab-firmware" class="nav-link" role="tab" aria-controls="firmware" aria-selected="false" tabindex="-1">
+             <svg viewBox="0 0 24 24" class="nav-icon" fill="none" stroke="currentColor" stroke-width="2">
+               <path d="M12 3v10" />
+               <path d="m8 9 4 4 4-4" />
+               <rect x="4" y="17" width="16" height="4" rx="2" />
+             </svg>
+             Firmware Update
+           </a>
+           <a href="#files" id="tab-files" class="nav-link" role="tab" aria-controls="files" aria-selected="false" tabindex="-1">
+             <svg viewBox="0 0 24 24" class="nav-icon" fill="none" stroke="currentColor" stroke-width="2">
+               <path d="M4 7a2 2 0 0 1 2-2h4l2 2h6a2 2 0 0 1 2 2v2H4Z" />
+               <path d="M4 11h16v7a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2Z" />
+               <path d="M8 15h8" />
+             </svg>
+             File Manager
+           </a>
+         </nav>
+         <div class="connection-badge connection-badge-${__status.online ? 'online' : 'offline'}" aria-label="connection active">
+           <span class="connection-label">${__status.online ? 'live' : 'offline'}</span>
+           <span class="connection-dot connection-dot-${__status.online ? 'online' : 'offline'}" aria-hidden="true"></span>
+         </div>
+       </div>
+       <div class="header-actions">
+         <nav class="nav-tabs">
+           <div class="nav-link">
+             <svg viewBox="0 0 24 24" class="nav-icon" fill="none" stroke="currentColor" stroke-width="2">
+               <path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2" />
+               <circle cx="12" cy="7" r="4" />
+             </svg>
+             <span>${__status.username || 'admin'}</span>
+             <svg viewBox="0 0 24 24"
+                  onclick="Dashboard.logout()"
+                  style="cursor: pointer;"
+               class="nav-icon" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
+               <path d="M9 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h4" />
+               <path d="M16 17l5-5-5-5" />
+               <path d="M21 12H9" />
+             </svg>
+           </div>
+         </nav>
+       </div>
+     </div>
+   </div>
+   <main class="tab-stage">
+     <section id="overview" class="tab-panel tab-panel-active" role="tabpanel" aria-labelledby="tab-overview">
+       <div class="metrics-grid" aria-label="Device metrics overview">
+         <article class="metric-tile">
+           <div class="metric-label">Temperature</div>
+           <div class="metric-value-row">
+             <div class="metric-value">
+               <span class="metric-number" data-bind="metrics.temperature">24.8</span>
+               <span class="metric-unit">°C</span>
+             </div>
+             <span class="metric-status metric-status-good">ok</span>
+           </div>
+         </article>
+         <article class="metric-tile metric-tile-warning">
+           <div class="metric-label">CPU Load</div>
+           <div class="metric-value-row">
+             <div class="metric-value">
+               <span class="metric-number" data-bind="metrics.cpu">37</span>
+               <span class="metric-unit">%</span>
+             </div>
+             <span class="metric-status metric-status-warn">moderate</span>
+           </div>
+         </article>
+         <article class="metric-tile metric-tile-alert">
+           <div class="metric-label">Free Memory</div>
+           <div class="metric-value-row">
+             <div class="metric-value">
+               <span class="metric-number">${metrics.ram}</span>
+               <span class="metric-unit">KB</span>
+             </div>
+             <span class="metric-status metric-status-alert" style="${metrics.ram <= 30 ? '': 'display:none;'}">low</span>
+             <span class="metric-status metric-status-warn" style="${metrics.ram <= 50 && metrics.ram > 30 ? '': 'display:none;'}">ok-ish</span>
+           </div>
+         </article>
+         <article class="metric-tile">
+           <div class="metric-label">Volume</div>
+           <div class="metric-value-row">
+             <div class="metric-value">
+               <span class="metric-number" data-bind="settings.volume">18.7</span>
+               <span class="metric-unit">dB</span>
+             </div>
+             <span class="metric-status metric-status-good">ok</span>
+           </div>
+         </article>
+       </div>
 
         <div class="grid" style="grid-template-columns: 1fr 1fr;">
 
@@ -596,5 +677,6 @@ a, a:visited, a:link { text-decoration: none; }
         </div>
       </section>
     </main>
+    </div>
   </body>
 </html>
diff --git a/tutorials/device-dashboard/minimal/dashboard.html b/tutorials/device-dashboard/minimal/dashboard.html
index 7f89b622..e33646b7 100644
--- a/tutorials/device-dashboard/minimal/dashboard.html
+++ b/tutorials/device-dashboard/minimal/dashboard.html
@@ -11,6 +11,9 @@
         debug: true,
         data: { status: { led1: false, version: '1.0.0' } },
       });
+
+      // Show dashboard only when all device data is reported
+      Dashboard.on('ready', () => document.body.style.visibility = 'visible');
     </script>
 
     <style>
@@ -27,8 +30,8 @@
     </style>
   </head>
 
-  <body>
-    <main style="margin: 2rem; color: #64748b;">
+  <body style="visibility: hidden;">
+    <main id="main" style="margin: 2rem; color: #64748b;">
       <h1>LED control version ${status.version}</h1>
 
       <div style="display: flex; gap: 1rem; ">