From bbd27a0a9c8d283dbc922b5b14c35b3add4b770b Mon Sep 17 00:00:00 2001
From: Sergey Lyubka <cpq@users.noreply.github.com>
Date: Sat, 16 Dec 2023 19:57:13 +0000
Subject: [PATCH] MQTT dashboard nitpicks

---
 .../device-dashboard/web_root/components.js   |   2 +-
 examples/mqtt-dashboard/dashboard/main.css    |   2 +-
 examples/mqtt-dashboard/dashboard/main.js     | 487 +++++++++---------
 examples/mqtt-dashboard/device/main.c         |  22 +-
 examples/mqtt-dashboard/device/net.c          | 262 +++++-----
 examples/mqtt-dashboard/device/net.h          |  14 +-
 6 files changed, 401 insertions(+), 388 deletions(-)

diff --git a/examples/device-dashboard/web_root/components.js b/examples/device-dashboard/web_root/components.js
index b5344052..57ca11cc 100644
--- a/examples/device-dashboard/web_root/components.js
+++ b/examples/device-dashboard/web_root/components.js
@@ -230,7 +230,7 @@ export function Setting(props) {
   if (props.type == 'select') input = SelectValue;
   return html`
 <div class=${props.cls || 'grid grid-cols-2 gap-2 my-1'}>
-  <label class="flex items-center text-sm text-gray-700 mr-2 font-medium">${props.title}<//>
+  <label class="flex items-center text-sm text-gray-700 mr-2 font-medium ${props.title || 'hidden'}">${props.title}<//>
   <div class="flex items-center">${h(input, props)}<//>
 <//>`;
 };
diff --git a/examples/mqtt-dashboard/dashboard/main.css b/examples/mqtt-dashboard/dashboard/main.css
index 9dffbe9f..134b49f8 100644
--- a/examples/mqtt-dashboard/dashboard/main.css
+++ b/examples/mqtt-dashboard/dashboard/main.css
@@ -1 +1 @@
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diff --git a/examples/mqtt-dashboard/dashboard/main.js b/examples/mqtt-dashboard/dashboard/main.js
index 50485cf1..26b18831 100644
--- a/examples/mqtt-dashboard/dashboard/main.js
+++ b/examples/mqtt-dashboard/dashboard/main.js
@@ -1,95 +1,70 @@
 'use strict';
-import { h, render, useState, useEffect, useRef, html } from  './bundle.js';
-import { Icons, Setting, Button, tipColors, Colored, Notification} from './components.js';
+import {h, html, render, useEffect, useRef, useState} from './bundle.js';
+import {Button, Colored, Icons, Notification, Setting, tipColors} from './components.js';
 
 const Logo = props => html`<svg class=${props.class} xmlns="http://www.w3.org/2000/svg" viewBox="0 0 12.87 12.85"><defs><style>.ll-cls-1{fill:none;stroke:#000;stroke-miterlimit:10;stroke-width:0.5px;}</style></defs><g id="Layer_2" data-name="Layer 2"><g id="Layer_1-2" data-name="Layer 1"><path class="ll-cls-1" d="M12.62,1.82V8.91A1.58,1.58,0,0,1,11,10.48H4a1.44,1.44,0,0,1-1-.37A.69.69,0,0,1,2.84,10l-.1-.12a.81.81,0,0,1-.15-.48V5.57a.87.87,0,0,1,.86-.86H4.73V7.28a.86.86,0,0,0,.86.85H9.42a.85.85,0,0,0,.85-.85V3.45A.86.86,0,0,0,10.13,3,.76.76,0,0,0,10,2.84a.29.29,0,0,0-.12-.1,1.49,1.49,0,0,0-1-.37H2.39V1.82A1.57,1.57,0,0,1,4,.25H11A1.57,1.57,0,0,1,12.62,1.82Z"/><path class="ll-cls-1" d="M10.48,10.48V11A1.58,1.58,0,0,1,8.9,12.6H1.82A1.57,1.57,0,0,1,.25,11V3.94A1.57,1.57,0,0,1,1.82,2.37H8.9a1.49,1.49,0,0,1,1,.37l.12.1a.76.76,0,0,1,.11.14.86.86,0,0,1,.14.47V7.28a.85.85,0,0,1-.85.85H8.13V5.57a.86.86,0,0,0-.85-.86H3.45a.87.87,0,0,0-.86.86V9.4a.81.81,0,0,0,.15.48l.1.12a.69.69,0,0,0,.13.11,1.44,1.44,0,0,0,1,.37Z"/></g></g></svg>`;
+const DefaultTopic = 'mg_mqtt_dashboard';
+const DefaultUrl = location.protocol == 'https:'
+  ? 'wss://broker.hivemq.com:8443/mqtt'
+  : 'ws://broker.hivemq.com:8000/mqtt';
+const DefaultDeviceConfig = {pins: [], log_level: 0};
+let MqttClient;
 
-const url = 'ws://broker.hivemq.com:8000/mqtt'
-const default_topic = 'topic_mg_device'
-let client;
-
-function Header( {topic, setTopicFn} ) {
-  const [inputValue, setInputValue] = useState(topic);
-  const [saveResult, setSaveResult] = useState(null);
-  const onInput = (ev) => setInputValue(ev.target.value);
+function Header({topic, setTopic, url, setUrl, connected}) {
   const forbiddenChars = ['$', '*', '+', '#', '/'];
-
   const onClick = () => {
-    const isValidTopic = (value) => {
-      return !forbiddenChars.some(char => value.includes(char));
-    };
-
-    if (isValidTopic(inputValue)) {
-      localStorage.setItem('topic', inputValue)
-      setTopicFn(inputValue);
+    const isValidTopic = val => !forbiddenChars.some(char => val.includes(char));
+    if (isValidTopic(topic)) {
+      localStorage.setItem('topic', topic)
+      setTopicFn(topic);
       window.location.reload();
     } else {
-      setSaveResult("Error: The topic cannot contain these characters: " + forbiddenChars)
+      setSaveResult('Error: The topic cannot contain these characters: ' + forbiddenChars);
     }
   };
-
   return html`
-    <div class="bg-white sticky top-0 z-[48] w-full border-b-2 border-gray-300 py-3 shadow-md transition-all duration-300 transform">
-      <div class="mx-auto flex justify-between items-center px-5">
-        <div class="text-gray-800 font-semibold tracking-wide">
-          <h1 class="text-2xl">MQTT Dashboard</h1>
-        </div>
-        <div class="flex space-x-4">
-          <div class="text-lg font-medium text-gray-700 text-center">
-            <div class="text-gray-500">MQTT Server:</div>
-            <code class="bg-gray-100 font-normal text-sm rounded w-full flex-1 py-0.5 px-2 text-gray-700" style="font-size: 0.8em; display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; padding: 1px; background-color: #f9f9f9; border: 1px solid #ddd; border-radius: 5px;">
-              ${url}
-            </code>
-          </div>
-          <div style="border-left: 1px solid #ddd; height: 50px;"></div>
-          <div class="text-lg font-medium text-gray-700 text-center">
-            <div class="text-gray-500">Topic:</div>
-            <div class="flex w-full items-center rounded border shadow-sm bg-white">
-              <input type="text" value=${inputValue} onchange=${onInput} step="1" class="bg-white font-normal text-sm rounded w-full flex-1 py-0.5 px-2 text-gray-700 placeholder:text-gray-400 focus:outline-none disabled:cursor-not-allowed disabled:bg-gray-100 disabled:text-gray-500"/>
-            </div>
-          </div>
-          <div class="mb-1 mt-3 flex place-content-end"><${Button} icon=${Icons.save} onclick=${onClick} title="Change topic" /><//>
-          ${saveResult && html`<${Notification} ok=${saveResult === "Success!"}
-            text=${saveResult} close=${() => setSaveResult(null)} />`}
-        </div>
-      </div>
-    </div>
-  `;
+    <div class="top-0 py-2 border-b-2 bg-stone-100">
+      <div class="flex px-4">
+        <div class="flex grow gap-4">
+          <h1 class="text-2xl font-semibold">MQTT Dashboard</h1>
+          <small class="text-gray-500 mt-2.5">powered by Mongoose<//>
+        <//>
+        <div class="flex gap-2 items-center">
+          <${Setting} value=${url} addonLeft="MQTT Server" cls="py-1 w-96" disabled=${connected} />
+          <${Setting} value=${topic} addonLeft="Root Topic" cls="py-1" disabled=${connected} />
+          <${Button} icon=${Icons.link} onclick=${onClick} title=${connected ? 'Disconnect' : 'Connect'} />
+        <//>
+      <//>
+    <//>`;
 };
 
-function Devices({ devices, onClickFn }) {
+function Sidebar({devices, onclick}) {
   const Td = props => html`
-    <td class="whitespace-nowrap border-b border-slate-200 py-2 px-4 pr-3 text-sm text-slate-900">${props.text}</td>`;
+    <td class="whitespace-nowrap border-b border-slate-200 py-2 px-4 pr-3 text-sm text-slate-900">${
+      props.text}</td>`;
 
-    const Device = ({ d }) => html`
-    <tr class="hover:bg-slate-100 cursor-pointer" onClick=${() => onClickFn(d.id)}>
-      <td class="border-b-2 border-slate-300 py-2 text-center align-middle">
-        <div class="flex flex-col items-center justify-center h-full">
-          <span>ID ${d.id}</span>
-          <${Colored} colors=${d.online ? tipColors.green : tipColors.red} text=${d.online ? 'online' : 'offline'} />
-        </div>
-      </td>
-    </tr>`;
+  const Device = ({d}) => html`
+    <div class="hover:bg-stone-100 cursor-pointer flex gap-3 px-4 py-2 justify-between"
+        onclick=${ev => onclick(d.id)}>
+      <span>${d.id}</span>
+      <${Colored}
+        colors=${d.online ? tipColors.green : tipColors.red}
+        text=${d.online ? 'online' : 'offline'} />
+    <//>`;
 
   return html`
-    <div class="m-4 divide-y divide-gray-200 overflow-auto rounded bg-white">
-      <div class="font-semibold flex items-center text-gray-600 px-3 justify-center whitespace-nowrap">
-        <div class="font-bold flex items-center text-gray-600">
-          Devices list
-        </div>
+    <div class="overflow-auto divide-y border-r xbasis-60 w-60 flex-none">
+      <div class="font-light uppercase flex items-center text-gray-600 px-4 py-2 bg-stone-100">
+        Devices
       <//>
-      <div class="inline-block min-w-full align-middle" style="max-height: 82vh; overflow: auto;">
-        <table class="w-full table table-bordered">
-          <tbody>
-            ${(devices ? devices : []).map(d => h(Device, { d }))}
-          </tbody>
-        </table>
-      </div>
-    </div>`;
+      ${(devices ? devices : []).map(d => h(Device, {d}))}
+    <//>`;
 };
 
 function FirmwareStatus({title, info, children}) {
-  const state = ['UNAVAILABLE', 'FIRST_BOOT', 'NOT_COMMITTED', 'COMMITTED'][(info.status || 0) % 4];
+  const state =
+      ['UNAVAILABLE', 'FIRST_BOOT', 'NOT_COMMITTED',
+       'COMMITTED'][(info.status || 0) % 4];
   const valid = info.status > 0;
   return html`
     <div class="bg-white divide-y border rounded">
@@ -100,7 +75,8 @@ function FirmwareStatus({title, info, children}) {
       <div class="my-1">Status: ${state}<//>
       <div class="my-1">CRC32: ${valid ? info.crc32.toString(16) : 'n/a'}<//>
       <div class="my-1">Size: ${valid ? info.size : 'n/a'}<//>
-      <div class="my-1">Flashed at: ${valid ? new Date(info.timestamp * 1000).toLocaleString() : 'n/a'}<//>
+      <div class="my-1">Flashed at: ${
+      valid ? new Date(info.timestamp * 1000).toLocaleString() : 'n/a'}<//>
       ${children}
       <//>
     <//>`;
@@ -121,7 +97,9 @@ function UploadFileButton(props) {
     return new Promise(function(resolve, reject) {
       const finish = ok => {
         setUpload(null);
-        const res = props.onupload ? props.onupload(ok, fileName, fileData.length) : null;
+        const res = props.onupload ?
+            props.onupload(ok, fileName, fileData.length) :
+            null;
         if (res && typeof (res.catch) === 'function') {
           res.catch(() => false).then(() => ok ? resolve() : reject());
         } else {
@@ -132,27 +110,36 @@ function UploadFileButton(props) {
       const sendChunk = function(offset) {
         var chunk = fileData.subarray(offset, offset + chunkSize) || '';
         var ok;
-        setStatusByID('Uploading ' + fileName + ', bytes ' + offset + '..' +
-          (offset + chunk.length) + ' of ' + fileData.length, props.id);
-        const params = {chunk: btoa(String.fromCharCode.apply(null, chunk)), offset: offset, total: fileData.length}
-        props.publishFn("ota.upload", params)
-          .then(function(res) {
-            if (res.result === "ok" && chunk.length > 0) sendChunk(offset + chunk.length);
-            ok = res.result === "ok";
-            return res;
-          })
-          .then(function(res) {
-            if (!ok) setStatusByID('Error: ' + res.error, props.id), finish(ok); // Fail
-            if (chunk.length > 0) return; // More chunks to send
-            setStatus(x => x + '. Done, resetting device...');
-            finish(ok); // All chunks sent
-          })
-          .catch(e => {
-            setStatusByID("Error: timed out", props.id);
-            finish(false)
-          });
+        setStatusByID(
+            'Uploading ' + fileName + ', bytes ' + offset + '..' +
+                (offset + chunk.length) + ' of ' + fileData.length,
+            props.id);
+        const params = {
+          chunk: btoa(String.fromCharCode.apply(null, chunk)),
+          offset: offset,
+          total: fileData.length
+        };
+        props.publishFn('ota.upload', params)
+            .then(function(res) {
+              if (res.result === 'ok' && chunk.length > 0)
+                sendChunk(offset + chunk.length);
+              ok = res.result === 'ok';
+              return res;
+            })
+            .then(function(res) {
+              if (!ok)
+                setStatusByID('Error: ' + res.error, props.id),
+                    finish(ok);              // Fail
+              if (chunk.length > 0) return;  // More chunks to send
+              setStatus(x => x + '. Done, resetting device...');
+              finish(ok);  // All chunks sent
+            })
+            .catch(e => {
+              setStatusByID('Error: timed out', props.id);
+              finish(false)
+            });
       };
-      //setFailed(false);
+      // setFailed(false);
       sendChunk(0);
     });
   };
@@ -170,7 +157,8 @@ function UploadFileButton(props) {
   };
 
   const onclick = function(ev) {
-    let fn; setUpload(x => fn = x);
+    let fn;
+    setUpload(x => fn = x);
     if (!fn) input.current.click();  // No upload in progress, show file dialog
     return fn;
   };
@@ -182,39 +170,53 @@ function UploadFileButton(props) {
 
   return html`
 <div class="inline-flex flex-col ${props.class}">
-  <input class="hidden" type="file" ref=${input} onchange=${onchange} accept=${props.accept} />
-  <${Button} title=${props.title} icon=${Icons.download} onclick=${onclick} ref=${btn} colors=${props.colors} disabled=${props.disabled} />
-  <div class="py-2 text-sm text-slate-400 ${status || 'hidden'}">${status[props.id]}<//>
+  <input class="hidden" type="file" ref=${input} onchange=${onchange} accept=${
+      props.accept} />
+  <${Button} title=${props.title} icon=${Icons.download} onclick=${
+      onclick} ref=${btn} colors=${props.colors} disabled=${props.disabled} />
+  <div class="py-2 text-sm text-slate-400 ${status || 'hidden'}">${
+      status[props.id]}<//>
 <//>`;
 };
 
-function FirmwareUpdate({ publishFn, disabled, info, deviceID }) {
+function FirmwareUpdate({publishFn, disabled, info, deviceID}) {
   const [clean, setClean] = useState(false)
   const refresh = () => {};
   useEffect(refresh, []);
-  const oncommit = ev => { publishFn("ota.commit") };
-  const onreboot = ev => { publishFn("device.reset")};
-  const onrollback = ev => { publishFn("ota.rollback") };
+  const oncommit = ev => {
+    publishFn('ota.commit')
+  };
+  const onreboot = ev => {
+    publishFn('device.reset')
+  };
+  const onrollback = ev => {
+    publishFn('ota.rollback')
+  };
   const onerase = ev => {};
   const onupload = function(ok, name, size) {
     if (!ok) return false;
-    return new Promise(r => setTimeout(ev => { refresh(); r(); }, 3000)).then(r => setClean(true));
+    return new Promise(r => setTimeout(ev => {
+                         refresh();
+                         r();
+                       }, 3000)).then(r => setClean(true));
   };
 
-  const defaultInfo = {status: 0, crc32: 0, size: 0, timestamp: 0}
+  const defaultInfo = {status: 0, crc32: 0, size: 0, timestamp: 0};
   return html`
-  <div class="bg-slate-200 border rounded-md text-ellipsis overflow-auto">
-    <div class="bg-slate-100 px-4 py-2 flex items-center justify-between font-light uppercase text-gray-600">
+  <div class="bg-slate-200 border rounded text-ellipsis overflow-auto mt-4">
+    <div class="bg-white px-4 py-2 flex items-center justify-between font-light uppercase text-gray-600">
       Over-the-air firmware updates
     </div>
     <div class="gap-1 grid grid-cols-3 lg:grid-cols-3">
-      <${FirmwareStatus} title="Current firmware image" info=${info[0] ? info[0] : defaultInfo}>
+      <${FirmwareStatus} title="Current firmware image"
+        info=${info[0] ? info[0] : defaultInfo}>
         <div class="flex flex-wrap gap-2">
           <${Button} title="Commit this firmware" onclick=${oncommit}
             icon=${Icons.thumbUp} disabled=${disabled} cls="w-full" />
         <//>
       <//>
-      <${FirmwareStatus} title="Previous firmware image" info=${info[1] ? info[1] : defaultInfo}>
+      <${FirmwareStatus} title="Previous firmware image" info=${
+      info[1] ? info[1] : defaultInfo}>
         <${Button} title="Rollback to this firmware" onclick=${onrollback}
           icon=${Icons.backward} disabled=${disabled} cls="w-full" />
       <//>
@@ -224,105 +226,117 @@ function FirmwareUpdate({ publishFn, disabled, info, deviceID }) {
         <//>
         <div class="px-4 py-3 flex flex-col gap-2 grow">
           <${UploadFileButton}
-            title="Upload new firmware: choose .bin file:" publishFn=${publishFn} onupload=${onupload} clean=${clean} setCleanFn=${setClean} disabled=${disabled}
+            title="Upload new firmware: choose .bin file:"
+              publishFn=${publishFn} onupload=${onupload} clean=${clean}
+              setCleanFn=${setClean} disabled=${disabled}
               id=${deviceID} url="api/firmware/upload" accept=".bin,.uf2" />
           <div class="grow"><//>
-          <${Button} title="Reboot device" onclick=${onreboot} icon=${Icons.refresh} disabled=${disabled} cls="w-full" />
-          <${Button} title="Erase last sector" onclick=${onerase} icon=${Icons.doc} disabled=${disabled} cls="w-full hidden" />
+          <${Button} title="Reboot device" onclick=${onreboot}
+            icon=${Icons.refresh} disabled=${disabled} cls="w-full" />
+          <${Button} title="Erase last sector" onclick=${onerase}
+            icon=${Icons.doc} disabled=${disabled} cls="w-full hidden" />
         <//>
       <//>
     <//>
   <//>`;
 };
 
-function Config( {deviceData, setDeviceConfig, publishFn} ) {
-  const [localConfig, setLocalConfig] = useState();
+function DeviceControlPanel({device, setDeviceConfig, publishFn, connected}) {
+  const cfg = device && device.config ? device.config : DefaultDeviceConfig;
+  const [localConfig, setLocalConfig] = useState(cfg);
   const [saveResult, setSaveResult] = useState(null);
-  const [saving, setSaving] = useState(false);
-  useEffect(() => {
-    if (deviceData) {
-      if (deviceData.config) {
-        setLocalConfig(deviceData.config)
-      } else {
-        let config = {}
-        setLocalConfig(config)
-      }
-    }
-  }, [deviceData]);
+
+  useEffect(() => setLocalConfig(cfg), [device]);
 
   const logOptions = [[0, 'Disable'], [1, 'Error'], [2, 'Info'], [3, 'Debug']];
-  const mksetfn = k => (v => setLocalConfig(x => Object.assign({}, x, { [k]: v })));
+  const mksetfn = k => (v => setLocalConfig(x => Object.assign({}, x, {[k]: v})));
 
-  const onSave = () => {
-    setSaving(true)
-    publishFn("config.set", localConfig).then(r => {
-      setDeviceConfig(deviceData.id, localConfig)
-      setSaveResult("Success!")
-      setSaving(false)
-    }).catch(e => {
-      setDeviceConfig(deviceData.id, deviceData.config)
-      setSaveResult("Failed!")
-      setSaving(false)
-    })
-  };
+  const onSave = ev => publishFn('config.set', localConfig).then(r => {
+    setDeviceConfig(device.id, localConfig)
+    setSaveResult('Success!')
+  }).catch(e => {
+    setDeviceConfig(device.id, device.config)
+    setSaveResult('Failed!')
+  })
 
-  const onLedToggle = function(ev) {
-    localConfig.led_status = !localConfig.led_status;
-    onSave();
-  };
-
-  if (!deviceData || !localConfig) {
-    return ``;
+  if (!device || !localConfig) {
+    return html`
+    <div class="flex grow text-gray-400 justify-center items-center text-xl">
+      No device selected. Click on a device on a sidebar
+    <//>`;
   }
 
+  // To delete device, set an empty retained message
+  const onforget = function(ev) {
+    MqttClient.publish(device.topic, '', {retain: true});
+    location.reload();
+  };
+
+  const mksetpin = (pin, val) => setLocalConfig(x => {
+    let pins = x.pins.slice();
+    pins[pin] = val ? 0 : 1;
+    return Object.assign({}, x, {pins});
+  });
+
+  const settingstyle = 'inline-block mr-8 my-1 bg-gray-100 rounded px-2';
+  const Pin = (value, pin) =>  html`
+  <div class="${settingstyle} w-32">
+    <${Setting}
+      setfn=${ev => mksetpin(pin, value)}
+      type="switch" value=${value} xcls="py-1 w-32 overflow-auto"
+      disabled=${!device.online || !connected} title="Pin ${pin}" />
+  <//>`;
+
   return html`
-  <div class="m-4 space-y-2">
-  <h3 class="text-lg font-semibold mb-3">Device ${deviceData.id} Configuration Panel</h3>
-  <div class="divide-y border rounded bg-slate-200">
-    <div class="bg-slate-100 px-4 py-2 flex items-center font-light uppercase text-gray-600">
-      <span class="mr-2">
-      Status: ${html`<${Colored} colors=${deviceData.online ? tipColors.green : tipColors.red} text=${deviceData.online ? 'online' : 'offline'} />`}
-      </span>
-    <//>
-    <div class="grid grid-cols-2 gap-1">
-      <div class="py-1 divide-y border rounded bg-white flex flex-col">
-        <div class="font-light uppercase flex items-center text-gray-600 px-4 py-2">
-          LED Settings
+  <div class="flex-1 xgrow overflow-auto bg-gray-200 xpx-4 xpy-2 p-3">
+    <div class="divide-y border rounded bg-white xbg-slate-100 my-y">
+
+      <div class="px-4 py-2 flex justify-between items-center font-light uppercase text-gray-600 rounded">
+        <div class="flex gap-2 items-center">
+          <span>Device ${device.id}<//>
+          ${html`<${Colored}
+            colors=${device.online ? tipColors.green : tipColors.red}
+            text=${ device.online ? 'online' : 'offline'} />`}
         <//>
-        <div class="py-2 px-5 flex-1 flex flex-col relative">
-        <${Setting} title="LED status" value=${localConfig.led_status} setfn=${onLedToggle} type="switch" disabled=${!deviceData.online} />
-        <${Setting} title="LED Pin" type="number" value=${localConfig.led_pin} setfn=${mksetfn('led_pin')} disabled=${!deviceData.online} />
+        <${Button} title="Forget this device"
+          disabled=${device.online || !connected}
+          icon=${Icons.fail} onclick=${onforget}/>
+      <//>
+
+      <div class="p-4 xgrid gap-3">
+        ${localConfig.pins.map((val, pin) => Pin(val, pin))}
+        <div><//>
+
+        <div class="${settingstyle} w-48">
+          <${Setting} title="Log Level" type="select"
+            value=${localConfig.log_level} setfn=${mksetfn('log_level')}
+            options=${logOptions} disabled=${!device.online}/>
         <//>
-      </div>
-      <div class="py-1 divide-y border rounded bg-white flex flex-col">
-        <div class="font-light uppercase flex items-center text-gray-600 px-4 py-2">
-          Log & Display
-        <//>
-        <div class="py-2 px-5 flex-1 flex flex-col relative">
-        <${Setting} title="Log Level" type="select" value=${localConfig.log_level} setfn=${mksetfn('log_level')} options=${logOptions} disabled=${!deviceData.online}/>
-        <${Setting} title="Brightness" type="number" value=${localConfig.brightness} setfn=${mksetfn('brightness')} disabled=${!deviceData.online} />
+
         <div class="mt-3 flex justify-end">
-        ${saveResult && html`<${Notification} ok=${saveResult === "Success!"}
-        text=${saveResult} close=${() => setSaveResult(null)} />`}
-          <${Button} icon=${Icons.save} onclick=${onSave} title=${saving ? "Saving..." : "Save Settings"} disabled=${!deviceData.online || saving} />
-        </div>
+          ${saveResult && html`<${Notification} ok=${saveResult === 'Success!'}
+            text=${saveResult} close=${() => setSaveResult(null)} />`}
+          <${Button} icon=${Icons.save} onclick=${onSave}
+            title="Save Settings" disabled=${!device.online} />
         <//>
-      </div>
-    </div>
-  </div>
-  <${FirmwareUpdate} deviceID=${deviceData.id} publishFn=${publishFn} disabled=${!deviceData.online} info=${[localConfig.crnt_fw, localConfig.prev_fw]} />
-</div>`;
+      <//>
+    <//>
+
+    <${FirmwareUpdate} deviceID=${device.id} publishFn=${publishFn}
+      disabled=${!device.online}
+      info=${[localConfig.crnt_fw, localConfig.prev_fw]} />
+  </div>`;
 }
 
 const App = function() {
   const [devices, setDevices] = useState([]);
   const [currentDevID, setCurrentDevID] = useState(localStorage.getItem('currentDevID') || '');
   const [loading, setLoading] = useState(true);
-  const [topic, setTopic] = useState(localStorage.getItem('topic') || default_topic);
+  const [url, setUrl] = useState(localStorage.getItem('url') || DefaultUrl);
+  const [topic, setTopic] = useState(localStorage.getItem('topic') || DefaultTopic);
   const [error, setError] = useState(null);
-
+  const [connected, setConnected] = useState(false);
   const responseHandlers = useRef({});
-  let connSuccessful = false;
 
   function addResponseHandler(correlationId, handler) {
     responseHandlers[correlationId] = handler;
@@ -332,32 +346,27 @@ const App = function() {
     delete responseHandlers[correlationId];
   }
 
-  const onRefresh = () => {
-    window.location.reload();
-  }
+  const onRefresh = ev => window.location.reload();
 
   const initConn = () => {
-    client = mqtt.connect(url, { 
-      connectTimeout: 5000,
-      reconnectPeriod: 0
-    });
+    MqttClient = mqtt.connect(url, {connectTimeout: 5000, reconnectPeriod: 0});
 
-    client.on('connect', () => {
-      console.log('Connected to the broker');
+    MqttClient.on('connect', () => {
+      //console.log('Connected to the broker');
       setLoading(false);
-      setError(null); // Reset error state upon successful connection
-      connSuccessful = true;
+      setError(null);  // Reset error state upon successful connection
+      setConnected(true);
 
       const statusTopic = topic + '/+/status'
       const txTopic = topic + '/+/tx'
 
       const subscribe = (topic) => {
-        client.subscribe(topic, (err) => {
+        MqttClient.subscribe(topic, (err) => {
           if (err) {
             console.error('Error subscribing to topic:', err);
             setError('Error subscribing to topic');
           } else {
-            console.log('Successfully subscribed to ', topic);
+            //console.log('Successfully subscribed to ', topic);
           }
         });
       };
@@ -366,40 +375,34 @@ const App = function() {
       subscribe(txTopic)
     });
 
-    client.on('message', (topic, message) => {
-      //console.log(`Received message from ${topic}: ${message.toString()}`);
+    MqttClient.on('message', (topic, message) => {
+      // console.log(`Received message from ${topic}: ${message.toString()}`);
+      if (message.length == 0) return;
       let response;
       try {
         response = JSON.parse(message.toString());
       } catch (err) {
-        console.error(err)
+        console.error(err);
         return;
       }
-      
-      if (topic.endsWith("/status")) {
-        const deviceID = topic.split('/')[1]
-        let device = {};
-        device.id = deviceID;
-        const params = response.params
+
+      if (topic.endsWith('/status')) {
+        let device = {topic: topic, id: topic.split('/')[1], config: DefaultDeviceConfig};
+        const params = response.params;
         if (!params) {
-          console.error("Invalid response")
-          return
+          console.error('Invalid response');
+          return;
         }
-        device.online = params.status === "online"
+        device.online = params.status === 'online'
         if (device.online) {
-          device.config = {}
-          device.config.led_status = params.led_status
-          device.config.led_pin = params.led_pin
-          device.config.brightness = params.brightness
-          device.config.log_level = params.log_level
-          device.config.crnt_fw = params.crnt_fw
-          device.config.prev_fw = params.prev_fw
+          device.config = params;
+          if (!device.config.pins) device.config.pins = [];
         }
         setDevice(device)
-      } else if (topic.endsWith("/tx")) {
+      } else if (topic.endsWith('/tx')) {
         if (!response.id) {
-          console.error("Invalid response")
-          return
+          console.error('Invalid response');
+          return;
         }
         const handler = responseHandlers[response.id];
         if (handler) {
@@ -409,13 +412,13 @@ const App = function() {
       }
     });
 
-    client.on('error', (err) => {
+    MqttClient.on('error', (err) => {
       console.error('Connection error:', err);
       setError('Connection cannot be established.');
     });
 
-    client.on('close', () => {
-      if (!connSuccessful) {
+    MqttClient.on('close', () => {
+      if (!connected) {
         console.error('Failed to connect to the broker.');
         setError('Connection cannot be established.');
         setLoading(false);
@@ -423,14 +426,12 @@ const App = function() {
     });
   };
 
-  useEffect(() => {
-    initConn();
-  }, []);
+  useEffect(() => initConn(), []);
 
   const handlePublish = (methodName, parameters, timeout = 5000) => {
     return new Promise((resolve, reject) => {
       const randomIdGenerator = function(length) {
-        return Math.random().toString(36).substring(2, length+2);
+        return Math.random().toString(36).substring(2, length + 2);
       };
       const randomID = randomIdGenerator(40);
       const timeoutID = setTimeout(() => {
@@ -445,27 +446,21 @@ const App = function() {
 
       if (currentDevID) {
         const rxTopic = topic + `/${currentDevID}/rx`;
-        const rpcPayload = {
-          method: methodName,
-          id: randomID
-        };
-  
+        const rpcPayload = {method: methodName, id: randomID};
         if (parameters) {
           rpcPayload.params = parameters;
         }
-  
-        client.publish(rxTopic, JSON.stringify(rpcPayload));
+        MqttClient.publish(rxTopic, JSON.stringify(rpcPayload));
       }
     });
   };
 
-  const getDeviceByID = (deviceID) => {
-    return devices.find(d => d.id === deviceID);
-  }
+  const getDeviceByID = (deviceID) => devices.find(d => d.id === deviceID);
 
   const setDevice = (devData) => {
     setDevices(prevDevices => {
-      const devIndex = prevDevices.findIndex(device => device.id === devData.id);
+      const devIndex =
+          prevDevices.findIndex(device => device.id === devData.id);
       if (devIndex !== -1) {
         if (!devData.online && !devData.config) {
           const updatedDevices = [...prevDevices];
@@ -484,10 +479,7 @@ const App = function() {
     setDevices(prevDevices => {
       return prevDevices.map(device => {
         if (device.id === deviceID) {
-          return {
-            ...device,
-            config: config
-          };
+          return {...device, config: config};
         }
         return device;
       });
@@ -500,7 +492,7 @@ const App = function() {
       setCurrentDevID(device.id);
       localStorage.setItem('currentDevID', device.id);
     }
-  }
+  };
 
   if (error) {
     return html`
@@ -513,7 +505,8 @@ const App = function() {
             Unable to connect to the MQTT broker.
           </p>
           <div class="text-center relative">
-            <${Button} title="Retry" onclick=${onRefresh} icon=${Icons.refresh} class="absolute top-4 right-4" />
+            <${Button} title="Retry" onclick=${onRefresh}
+              icon=${Icons.refresh} class="absolute top-4 right-4" />
           </div>
         </div>
       </div>
@@ -521,15 +514,17 @@ const App = function() {
   }
 
   return html`
-  <div class="min-h-screen bg-slate-100 flex flex-col space-y-2">
-    <${Header} topic=${topic} setTopicFn=${setTopic}/>
-    <div class="transition-all duration-300 transform flex flex-grow gap-4">
-      <div class="flex-none bg-white rounded shadow ">
-        <${Devices} devices=${devices} onClickFn=${onDeviceClick} />
-      <//>
-      <div class="flex-1 flex-grow bg-white rounded shadow h-full">
-        <${Config} deviceData=${getDeviceByID(currentDevID)} setDeviceConfig=${setDeviceConfig} publishFn=${handlePublish}/>
-      <//>
+  <div class="h-full flex flex-col">
+    <${Header}
+      topic=${topic} setTopic=${setTopic} url=${url}
+      setUrl=${setUrl} connected=${connected}
+    />
+    <div class="flex grow overflow-auto">
+      <${Sidebar} devices=${devices} onclick=${onDeviceClick} />
+      <${DeviceControlPanel}
+        device=${getDeviceByID(currentDevID)} connected=${connected}
+        setDeviceConfig=${setDeviceConfig} publishFn=${handlePublish}
+      />
     <//>
   <//>`;
 };
diff --git a/examples/mqtt-dashboard/device/main.c b/examples/mqtt-dashboard/device/main.c
index 058ade1c..2eb15adc 100644
--- a/examples/mqtt-dashboard/device/main.c
+++ b/examples/mqtt-dashboard/device/main.c
@@ -10,29 +10,27 @@ static void signal_handler(int signo) {
 }
 
 // Mocked device pins
-static bool s_pins[100];
+static bool s_pins[NUM_PINS];
 
-void hal_gpio_write(int pin, bool status) {
-  if (pin >= 0 && pin < (int) (sizeof(s_pins) / sizeof(s_pins[0]))) {
+bool hal_gpio_write(int pin, bool status) {
+  bool ok = false;
+  if (pin >= 0 && pin < NUM_PINS) {
     s_pins[pin] = status;
+    ok = true;
   }
+  return ok;
 }
 
 bool hal_gpio_read(int pin) {
-  return (pin >= 0 && pin < (int) (sizeof(s_pins) / sizeof(s_pins[0])))
-             ? s_pins[pin]
-             : false;
-}
-
-int hal_led_pin(void) {
-  return 0;
+  return (pin >= 0 && pin < NUM_PINS) ? s_pins[pin] : false;
 }
 
 int main(int argc, char *argv[]) {
   struct mg_mgr mgr;
+  int i;
 
   // Parse command-line flags
-  for (int i = 1; i < argc; i++) {
+  for (i = 1; i < argc; i++) {
     if (strcmp(argv[i], "-u") == 0 && argv[i + 1] != NULL) {
       g_url = argv[++i];
     } else if (strcmp(argv[i], "-i") == 0 && argv[i + 1] != NULL) {
@@ -62,8 +60,8 @@ int main(int argc, char *argv[]) {
     mg_mgr_poll(&mgr, 50);
   }
 
+  web_free();
   mg_mgr_free(&mgr);
-  web_destroy();
   MG_INFO(("Exiting on signal %d", s_signo));
 
   return 0;
diff --git a/examples/mqtt-dashboard/device/net.c b/examples/mqtt-dashboard/device/net.c
index 11e19260..d643cbb7 100644
--- a/examples/mqtt-dashboard/device/net.c
+++ b/examples/mqtt-dashboard/device/net.c
@@ -4,31 +4,50 @@
 #include "net.h"
 
 char *g_url = MQTT_SERVER_URL;
+char *g_root_topic = MQTT_ROOT_TOPIC;
 char *g_device_id;
-char *g_root_topic;
+
 static uint8_t s_qos = 1;             // MQTT QoS
-static struct mg_connection *s_conn;  // Client connection
-static struct mg_rpc *s_rpc_head = NULL;
+static struct mg_connection *s_conn;  // MQTT Client connection
+static struct mg_rpc *s_rpc = NULL;   // List of registered RPC methods
 
 struct device_config {
-  bool led_status;
-  int led_pin;
-  int brightness;
-  int log_level;
+  int pins[NUM_PINS];  // State of the GPIO pins
+  int log_level;       // Device logging level, 0-4
 };
 
 static struct device_config s_device_config;
 
-// This is for newlib and TLS (mbedTLS)
-uint64_t mg_now(void) {
-  return mg_millis();
-}
+// Device ID generation function. Create an ID that is unique
+// for a given device, and does not change between device restarts.
+static void set_device_id(void) {
+  char buf[15] = "";
 
-static void generate_device_id(void) {
-  char tmp[DEVICE_ID_LEN + 1];
-  tmp[DEVICE_ID_LEN] = '\0';
-  mg_random_str(tmp, DEVICE_ID_LEN);
-  g_device_id = strdup(tmp);
+#ifdef _WIN32
+  unsigned serial = 0;
+  if (GetVolumeInformationA("c:\\", NULL, 0, &serial, NULL, NULL, NULL, 0)) {
+    mg_snprintf(buf, sizeof(buf), "%lx", serial);
+  }
+#elif defined(__APPLE__)
+  FILE *fp = popen(
+      "ioreg -l | grep IOPlatformSerialNumber | cut -d'\"' -f4 | tr -d $'\n'",
+      "r");
+  if (fp != NULL) {
+    fread(buf, 1, sizeof(buf), fp);
+    fclose(fp);
+  }
+#elif defined(__linux__)
+  char *id = mg_file_read(&mg_fs_posix, "/etc/machine-id", NULL);
+  if (id != NULL) {
+    mg_snprintf(buf, sizeof(buf), "%s", id);
+    free(id);
+  }
+#endif
+
+  if (buf[0] == '\0') mg_snprintf(buf, sizeof(buf), "%s", "MyDeviceID");
+
+  buf[sizeof(buf) - 1] = '\0';
+  g_device_id = strdup(buf);
 }
 
 static size_t print_fw_status(void (*out)(char, void *), void *ptr,
@@ -40,45 +59,51 @@ static size_t print_fw_status(void (*out)(char, void *), void *ptr,
                     MG_ESC("timestamp"), mg_ota_timestamp(fw));
 }
 
+static size_t print_ints(void (*out)(char, void *), void *ptr, va_list *ap) {
+  int *array = va_arg(*ap, int *);
+  size_t i, len = 0, num_elems = va_arg(*ap, size_t);
+  for (i = 0; i < num_elems; i++) {
+    len += mg_xprintf(out, ptr, "%s%d", i ? "," : "", array[i]);
+  }
+  return len;
+}
+
 static void publish_status(struct mg_connection *c) {
-  char *status_topic = mg_mprintf("%s/%s/status", g_root_topic, g_device_id);
-  struct mg_str pubt = mg_str(status_topic);
+  char topic[100];
   struct mg_mqtt_opts pub_opts;
+  struct mg_iobuf io = {0, 0, 0, 512};
+
+  // Print JSON notification into the io buffer
+  mg_xprintf(mg_pfn_iobuf, &io,
+             "{%m:%m,%m:{%m:%m,%m:%d,%m:[%M],%m:%M,%m:%M}}",                //
+             MG_ESC("method"), MG_ESC("status.notify"), MG_ESC("params"),   //
+             MG_ESC("status"), MG_ESC("online"),                            //
+             MG_ESC(("log_level")), s_device_config.log_level,              //
+             MG_ESC(("pins")), print_ints, s_device_config.pins, NUM_PINS,  //
+             MG_ESC(("crnt_fw")), print_fw_status, MG_FIRMWARE_CURRENT,     //
+             MG_ESC(("prev_fw")), print_fw_status, MG_FIRMWARE_PREVIOUS);
+
   memset(&pub_opts, 0, sizeof(pub_opts));
-  pub_opts.topic = pubt;
-  s_device_config.led_status = hal_gpio_read(s_device_config.led_pin);
-  char *device_status_json = mg_mprintf(
-      "{%m:%m,%m:{%m:%m,%m:%s,%m:%hhu,%m:%hhu,%m:%hhu,%m:%M,%m:%M}}",
-      MG_ESC("method"), MG_ESC("status.notify"), MG_ESC("params"),
-      MG_ESC("status"), MG_ESC("online"), MG_ESC("led_status"),
-      s_device_config.led_status ? "true" : "false", MG_ESC("led_pin"),
-      s_device_config.led_pin, MG_ESC("brightness"), s_device_config.brightness,
-      MG_ESC(("log_level")), s_device_config.log_level, MG_ESC(("crnt_fw")),
-      print_fw_status, MG_FIRMWARE_CURRENT, MG_ESC(("prev_fw")),
-      print_fw_status, MG_FIRMWARE_PREVIOUS);
-  struct mg_str data = mg_str(device_status_json);
-  pub_opts.message = data;
-  pub_opts.qos = s_qos, pub_opts.retain = true;
+  mg_snprintf(topic, sizeof(topic), "%s/%s/status", g_root_topic, g_device_id);
+  pub_opts.topic = mg_str(topic);
+  pub_opts.message = mg_str_n((char *) io.buf, io.len);
+  pub_opts.qos = s_qos;
+  pub_opts.retain = true;
   mg_mqtt_pub(c, &pub_opts);
-  MG_INFO(("%lu PUBLISHED %.*s -> %.*s", c->id, (int) data.len, data.ptr,
-           (int) pubt.len, pubt.ptr));
-  free(device_status_json);
-  free(status_topic);
+  MG_INFO(("%lu PUBLISHED %s -> %.*s", c->id, topic, io.len, io.buf));
+  mg_iobuf_free(&io);
 }
 
 static void publish_response(struct mg_connection *c, char *buf, size_t len) {
-  char *tx_topic = mg_mprintf("%s/%s/tx", g_root_topic, g_device_id);
-  struct mg_str pubt = mg_str(tx_topic);
   struct mg_mqtt_opts pub_opts;
+  char topic[100];
+  mg_snprintf(topic, sizeof(topic), "%s/%s/tx", g_root_topic, g_device_id);
   memset(&pub_opts, 0, sizeof(pub_opts));
-  pub_opts.topic = pubt;
-  struct mg_str data = mg_str_n(buf, len);
-  pub_opts.message = data;
+  pub_opts.topic = mg_str(topic);
+  pub_opts.message = mg_str_n(buf, len);
   pub_opts.qos = s_qos;
   mg_mqtt_pub(c, &pub_opts);
-  MG_INFO(("%lu PUBLISHED %.*s -> %.*s", c->id, (int) data.len, data.ptr,
-           (int) pubt.len, pubt.ptr));
-  free(tx_topic);
+  MG_INFO(("%lu PUBLISHED %s -> %.*s", c->id, topic, len, buf));
 }
 
 static void subscribe(struct mg_connection *c) {
@@ -94,29 +119,26 @@ static void subscribe(struct mg_connection *c) {
 }
 
 static void rpc_config_set(struct mg_rpc_req *r) {
-  bool tmp_status, ok;
-  int tmp_brightness, tmp_level, tmp_pin;
+  struct device_config dc = s_device_config;
+  dc.log_level = (int) mg_json_get_long(r->frame, "$.params.log_level", -1);
 
-  ok = mg_json_get_bool(r->frame, "$.params.led_status", &tmp_status);
-  if (ok) s_device_config.led_status = tmp_status;
-
-  tmp_brightness = (int) mg_json_get_long(r->frame, "$.params.brightness", -1);
-  if (tmp_brightness >= 0) s_device_config.brightness = tmp_brightness;
-
-  tmp_level = (int) mg_json_get_long(r->frame, "$.params.log_level", -1);
-  if (tmp_level >= 0) {
-    s_device_config.log_level = tmp_level;
-    mg_log_set(s_device_config.log_level);
+  if (dc.log_level < 0 || dc.log_level > MG_LL_VERBOSE) {
+    mg_rpc_err(r, -32602, "Log level must be from 0 to 4");
+  } else {
+    int i, val;
+    for (i = 0; i < NUM_PINS; i++) {
+      char path[20];
+      mg_snprintf(path, sizeof(path), "$.params.pins[%lu]", i);
+      val = (int) mg_json_get_long(r->frame, path, -1);
+      if (val >= 0 && val != dc.pins[i]) {
+        dc.pins[i] = val;
+        hal_gpio_write((int) i, val);
+      }
+    }
+    mg_log_set(dc.log_level);
+    s_device_config = dc;
+    mg_rpc_ok(r, "true");
   }
-
-  tmp_pin = (int) mg_json_get_long(r->frame, "$.params.led_pin", -1);
-  if (tmp_pin != -1) s_device_config.led_pin = tmp_pin;
-
-  if (tmp_pin != -1 && ok) {
-    hal_gpio_write(s_device_config.led_pin, s_device_config.led_status);
-  }
-
-  mg_rpc_ok(r, "%m", MG_ESC("ok"));
 }
 
 static void rpc_ota_commit(struct mg_rpc_req *r) {
@@ -143,31 +165,29 @@ static void rpc_ota_rollback(struct mg_rpc_req *r) {
 static void rpc_ota_upload(struct mg_rpc_req *r) {
   long ofs = mg_json_get_long(r->frame, "$.params.offset", -1);
   long tot = mg_json_get_long(r->frame, "$.params.total", -1);
-  int len;
-  char *file_chunk = mg_json_get_b64(r->frame, "$.params.chunk", &len);
-  if (!file_chunk) {
+  int len = 0;
+  char *buf = mg_json_get_b64(r->frame, "$.params.chunk", &len);
+  if (buf == NULL) {
     mg_rpc_err(r, 1, "Error processing the binary chunk.");
-    return;
-  }
-  struct mg_str data = mg_str_n(file_chunk, len);
-  if (ofs < 0 || tot < 0) {
-    mg_rpc_err(r, 1, "offset and total not set");
-  } else if (ofs == 0 && mg_ota_begin((size_t) tot) == false) {
-    mg_rpc_err(r, 1, "mg_ota_begin(%ld) failed\n", tot);
-  } else if (data.len > 0 && mg_ota_write(data.ptr, data.len) == false) {
-    mg_rpc_err(r, 1, "mg_ota_write(%lu) @%ld failed\n", data.len, ofs);
-    mg_ota_end();
-  } else if (data.len == 0 && mg_ota_end() == false) {
-    mg_rpc_err(r, 1, "mg_ota_end() failed\n", tot);
   } else {
-    mg_rpc_ok(r, "%m", MG_ESC("ok"));
-    if (data.len == 0) {
-      // Successful mg_ota_end() called, schedule device reboot
-      mg_timer_add(s_conn->mgr, 500, 0, (void (*)(void *)) mg_device_reset,
-                   NULL);
+    if (ofs < 0 || tot < 0) {
+      mg_rpc_err(r, 1, "offset and total not set");
+    } else if (ofs == 0 && mg_ota_begin((size_t) tot) == false) {
+      mg_rpc_err(r, 1, "mg_ota_begin(%ld) failed\n", tot);
+    } else if (len > 0 && mg_ota_write(buf, len) == false) {
+      mg_rpc_err(r, 1, "mg_ota_write(%lu) @%ld failed\n", len, ofs);
+      mg_ota_end();
+    } else if (len == 0 && mg_ota_end() == false) {
+      mg_rpc_err(r, 1, "mg_ota_end() failed\n", tot);
+    } else {
+      mg_rpc_ok(r, "%m", MG_ESC("ok"));
+      if (len == 0) {  // Successful mg_ota_end() called, schedule device reboot
+        mg_timer_add(s_conn->mgr, 500, 0, (void (*)(void *)) mg_device_reset,
+                     NULL);
+      }
     }
+    free(buf);
   }
-  free(file_chunk);
 }
 
 static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
@@ -187,11 +207,12 @@ static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
   } else if (ev == MG_EV_MQTT_MSG) {
     // When we get echo response, print it
     struct mg_mqtt_message *mm = (struct mg_mqtt_message *) ev_data;
-    if (mm->data.len < 1024)
-      MG_INFO(("%lu RECEIVED %.*s <- %.*s", c->id, (int) mm->data.len,
-               mm->data.ptr, (int) mm->topic.len, mm->topic.ptr));
     struct mg_iobuf io = {0, 0, 0, 512};
-    struct mg_rpc_req r = {&s_rpc_head, 0, mg_pfn_iobuf, &io, 0, mm->data};
+    struct mg_rpc_req r = {&s_rpc, NULL, mg_pfn_iobuf,
+                           &io,    NULL, {mm->data.ptr, mm->data.len}};
+    size_t clipped_len = mm->data.len > 512 ? 512 : mm->data.len;
+    MG_INFO(("%lu RECEIVED %.*s <- %.*s", c->id, clipped_len, mm->data.ptr,
+             mm->topic.len, mm->topic.ptr));
     mg_rpc_process(&r);
     if (io.buf) {
       publish_response(c, (char *) io.buf, io.len);
@@ -206,51 +227,54 @@ static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
 }
 
 // Timer function - recreate client connection if it is closed
-static void timer_fn(void *arg) {
+static void timer_reconnect(void *arg) {
   struct mg_mgr *mgr = (struct mg_mgr *) arg;
   if (s_conn == NULL) {
-    char *status_topic = mg_mprintf("%s/%s/status", g_root_topic, g_device_id);
-    char *msg = mg_mprintf("{%m:%m,%m:{%m:%m}}", MG_ESC("method"),
-                           MG_ESC("status.notify"), MG_ESC("params"),
-                           MG_ESC("status"), MG_ESC("offline"));
-
-    struct mg_mqtt_opts opts = {.clean = true,
-                                .qos = s_qos,
-                                .topic = mg_str(status_topic),
-                                .version = 4,
-                                .keepalive = MQTT_KEEP_ALIVE_INTERVAL,
-                                .retain = true,
-                                .message = mg_str(msg)};
+    struct mg_mqtt_opts opts;
+    char topic[100], message[100];
+    mg_snprintf(topic, sizeof(topic), "%s/%s/status", g_root_topic,
+                g_device_id);
+    mg_snprintf(message, sizeof(message), "{%m:%m,%m:{%m:%m}}",
+                MG_ESC("method"), MG_ESC("status.notify"), MG_ESC("params"),
+                MG_ESC("status"), MG_ESC("offline"));
+    memset(&opts, 0, sizeof(opts));
+    opts.clean = true;
+    opts.qos = s_qos;
+    opts.topic = mg_str(topic);
+    opts.version = 4;
+    opts.keepalive = MQTT_KEEPALIVE_SEC;
+    opts.retain = true;
+    opts.message = mg_str(message);
     s_conn = mg_mqtt_connect(mgr, g_url, &opts, fn, NULL);
-    free(msg);
-    free(status_topic);
   }
 }
 
-static void timer_keepalive(void *arg) {
+static void timer_ping(void *arg) {
   mg_mqtt_send_header(s_conn, MQTT_CMD_PINGREQ, 0, 0);
   (void) arg;
 }
 
 void web_init(struct mg_mgr *mgr) {
-  int pingreq_interval_ms = MQTT_KEEP_ALIVE_INTERVAL * 1000 - 500;
-  if (!g_device_id) generate_device_id();
-  if (!g_root_topic) g_root_topic = MQTT_ROOT_TOPIC;
+  int i, ping_interval_ms = MQTT_KEEPALIVE_SEC * 1000 - 500;
+  set_device_id();
   s_device_config.log_level = (int) mg_log_level;
-  s_device_config.led_pin = hal_led_pin();
+  for (i = 0; i < NUM_PINS; i++) {
+    s_device_config.pins[i] = hal_gpio_read(i);
+  }
 
   // Configure JSON-RPC functions we're going to handle
-  mg_rpc_add(&s_rpc_head, mg_str("config.set"), rpc_config_set, NULL);
-  mg_rpc_add(&s_rpc_head, mg_str("ota.commit"), rpc_ota_commit, NULL);
-  mg_rpc_add(&s_rpc_head, mg_str("device.reset"), rpc_device_reset, NULL);
-  mg_rpc_add(&s_rpc_head, mg_str("ota.rollback"), rpc_ota_rollback, NULL);
-  mg_rpc_add(&s_rpc_head, mg_str("ota.upload"), rpc_ota_upload, NULL);
+  mg_rpc_add(&s_rpc, mg_str("config.set"), rpc_config_set, NULL);
+  mg_rpc_add(&s_rpc, mg_str("ota.commit"), rpc_ota_commit, NULL);
+  mg_rpc_add(&s_rpc, mg_str("ota.rollback"), rpc_ota_rollback, NULL);
+  mg_rpc_add(&s_rpc, mg_str("ota.upload"), rpc_ota_upload, NULL);
+  mg_rpc_add(&s_rpc, mg_str("device.reset"), rpc_device_reset, NULL);
 
-  mg_timer_add(mgr, 3000, MG_TIMER_REPEAT | MG_TIMER_RUN_NOW, timer_fn, mgr);
-  mg_timer_add(mgr, pingreq_interval_ms, MG_TIMER_REPEAT, timer_keepalive, mgr);
+  mg_timer_add(mgr, 3000, MG_TIMER_REPEAT | MG_TIMER_RUN_NOW, timer_reconnect,
+               mgr);
+  mg_timer_add(mgr, ping_interval_ms, MG_TIMER_REPEAT, timer_ping, mgr);
 }
 
-void web_destroy() {
-  mg_rpc_del(&s_rpc_head, NULL);  // Deallocate RPC handlers
+void web_free(void) {
+  mg_rpc_del(&s_rpc, NULL);  // Deallocate RPC handlers
   free(g_device_id);
 }
diff --git a/examples/mqtt-dashboard/device/net.h b/examples/mqtt-dashboard/device/net.h
index 77a5ff29..d7d13fd6 100644
--- a/examples/mqtt-dashboard/device/net.h
+++ b/examples/mqtt-dashboard/device/net.h
@@ -8,25 +8,21 @@
 extern "C" {
 #endif
 
-#ifndef MQTT_DASHBOARD
 #define MQTT_DASHBOARD 1
-#endif
-
-#define DEVICE_ID_LEN 10
-#define MQTT_KEEP_ALIVE_INTERVAL 60
+#define MQTT_KEEPALIVE_SEC 60
 #define MQTT_SERVER_URL "mqtt://broker.hivemq.com:1883"
-#define MQTT_ROOT_TOPIC "topic_mg_device"
+#define MQTT_ROOT_TOPIC "mg_mqtt_dashboard"
+#define NUM_PINS 30
 
 extern char *g_url;
 extern char *g_device_id;
 extern char *g_root_topic;
 
 void web_init(struct mg_mgr *mgr);
-void web_destroy();
+void web_free(void);
 
-void hal_gpio_write(int pin, bool status);
+bool hal_gpio_write(int pin, bool status);
 bool hal_gpio_read(int pin);
-int hal_led_pin(void);
 
 #ifdef __cplusplus
 }