diff --git a/transmit.h b/transmit.h
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+++ b/transmit.h
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+#ifndef TRANSMIT_H
+#define TRANSMIT_H
+
+const char transmit_html[] PROGMEM = R"rawliteral(
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>CAN Transmitter</title>
+    <style>
+        * { margin: 0; padding: 0; box-sizing: border-box; }
+        body {
+            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
+            background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
+            min-height: 100vh;
+            padding: 20px;
+        }
+        .container {
+            max-width: 1200px;
+            margin: 0 auto;
+            background: white;
+            border-radius: 15px;
+            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
+            overflow: hidden;
+        }
+        .header {
+            background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
+            color: white;
+            padding: 30px;
+            text-align: center;
+        }
+        .header h1 { font-size: 2.5em; margin-bottom: 10px; }
+        .header p { opacity: 0.9; font-size: 1.1em; }
+        .nav {
+            background: #2c3e50;
+            padding: 15px 30px;
+            display: flex;
+            gap: 20px;
+        }
+        .nav a {
+            color: white;
+            text-decoration: none;
+            padding: 10px 20px;
+            border-radius: 5px;
+            transition: all 0.3s;
+        }
+        .nav a:hover { background: #34495e; }
+        .nav a.active { background: #3498db; }
+        .content { padding: 30px; }
+        
+        .message-form {
+            background: #f8f9fa;
+            padding: 25px;
+            border-radius: 10px;
+            margin-bottom: 20px;
+        }
+        .form-row {
+            display: grid;
+            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
+            gap: 15px;
+            margin-bottom: 15px;
+        }
+        .form-group {
+            display: flex;
+            flex-direction: column;
+        }
+        .form-group label {
+            font-weight: 600;
+            margin-bottom: 5px;
+            color: #333;
+        }
+        .form-group input, .form-group select {
+            padding: 10px;
+            border: 2px solid #ddd;
+            border-radius: 5px;
+            font-size: 1em;
+            font-family: 'Courier New', monospace;
+        }
+        .form-group input:focus, .form-group select:focus {
+            outline: none;
+            border-color: #f093fb;
+        }
+        .data-bytes {
+            display: grid;
+            grid-template-columns: repeat(8, 1fr);
+            gap: 10px;
+        }
+        .data-bytes input {
+            text-align: center;
+            text-transform: uppercase;
+        }
+        .btn {
+            padding: 12px 25px;
+            border: none;
+            border-radius: 5px;
+            font-size: 1em;
+            font-weight: 600;
+            cursor: pointer;
+            transition: all 0.3s;
+        }
+        .btn-primary {
+            background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
+            color: white;
+        }
+        .btn-success {
+            background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
+            color: white;
+        }
+        .btn-danger {
+            background: linear-gradient(135deg, #eb3349 0%, #f45c43 100%);
+            color: white;
+        }
+        .btn:hover { transform: translateY(-2px); box-shadow: 0 5px 15px rgba(0,0,0,0.3); }
+        
+        .message-list {
+            background: #f8f9fa;
+            border-radius: 10px;
+            padding: 20px;
+        }
+        .message-item {
+            background: white;
+            padding: 15px;
+            margin-bottom: 10px;
+            border-radius: 8px;
+            display: grid;
+            grid-template-columns: 100px 80px 1fr 150px 120px;
+            gap: 15px;
+            align-items: center;
+            border-left: 4px solid #f093fb;
+        }
+        .message-item.active {
+            border-left-color: #38ef7d;
+            background: #f0fff4;
+        }
+        .message-id { font-weight: 700; color: #f5576c; font-family: 'Courier New', monospace; }
+        .message-type { 
+            padding: 5px 10px;
+            border-radius: 5px;
+            font-size: 0.85em;
+            font-weight: 600;
+            text-align: center;
+        }
+        .type-std { background: #3498db; color: white; }
+        .type-ext { background: #9b59b6; color: white; }
+        .message-data { font-family: 'Courier New', monospace; color: #666; }
+        .message-interval { color: #888; font-size: 0.9em; }
+        .message-controls {
+            display: flex;
+            gap: 5px;
+        }
+        .btn-small {
+            padding: 5px 12px;
+            font-size: 0.85em;
+        }
+        
+        h2 {
+            color: #333;
+            margin: 30px 0 20px 0;
+            padding-bottom: 10px;
+            border-bottom: 3px solid #f093fb;
+        }
+        
+        .status-bar {
+            background: #2c3e50;
+            color: white;
+            padding: 10px 20px;
+            border-radius: 5px;
+            margin-bottom: 20px;
+            display: flex;
+            justify-content: space-between;
+            align-items: center;
+        }
+        .status-bar span { font-weight: 600; }
+    </style>
+</head>
+<body>
+    <div class="container">
+        <div class="header">
+            <h1>📡 CAN Transmitter</h1>
+            <p>Send CAN Messages</p>
+        </div>
+        
+        <div class="nav">
+            <a href="/">📊 Monitor</a>
+            <a href="/transmit" class="active">📡 Transmit</a>
+        </div>
+        
+        <div class="content">
+            <div class="status-bar">
+                <span id="connection-status">🔴 Disconnected</span>
+                <span id="tx-count">Sent: 0 messages</span>
+            </div>
+            
+            <h2>➕ Add CAN Message</h2>
+            <div class="message-form">
+                <div class="form-row">
+                    <div class="form-group">
+                        <label>CAN ID (Hex)</label>
+                        <input type="text" id="can-id" placeholder="123" maxlength="8">
+                    </div>
+                    <div class="form-group">
+                        <label>Message Type</label>
+                        <select id="msg-type">
+                            <option value="std">Standard (11-bit)</option>
+                            <option value="ext">Extended (29-bit)</option>
+                        </select>
+                    </div>
+                    <div class="form-group">
+                        <label>DLC</label>
+                        <select id="dlc">
+                            <option value="0">0</option>
+                            <option value="1">1</option>
+                            <option value="2">2</option>
+                            <option value="3">3</option>
+                            <option value="4">4</option>
+                            <option value="5">5</option>
+                            <option value="6">6</option>
+                            <option value="7">7</option>
+                            <option value="8" selected>8</option>
+                        </select>
+                    </div>
+                    <div class="form-group">
+                        <label>Interval (ms)</label>
+                        <input type="number" id="interval" value="100" min="10" max="10000">
+                    </div>
+                </div>
+                
+                <div class="form-group" style="margin-bottom: 15px;">
+                    <label>Data Bytes (Hex)</label>
+                    <div class="data-bytes">
+                        <input type="text" id="d0" placeholder="00" maxlength="2" value="00">
+                        <input type="text" id="d1" placeholder="00" maxlength="2" value="00">
+                        <input type="text" id="d2" placeholder="00" maxlength="2" value="00">
+                        <input type="text" id="d3" placeholder="00" maxlength="2" value="00">
+                        <input type="text" id="d4" placeholder="00" maxlength="2" value="00">
+                        <input type="text" id="d5" placeholder="00" maxlength="2" value="00">
+                        <input type="text" id="d6" placeholder="00" maxlength="2" value="00">
+                        <input type="text" id="d7" placeholder="00" maxlength="2" value="00">
+                    </div>
+                </div>
+                
+                <div style="display: flex; gap: 10px;">
+                    <button class="btn btn-primary" onclick="addMessage()">➕ Add to List</button>
+                    <button class="btn btn-success" onclick="sendOnce()">📤 Send Once</button>
+                </div>
+            </div>
+            
+            <h2>📋 Message List</h2>
+            <div style="margin-bottom: 15px; display: flex; gap: 10px;">
+                <button class="btn btn-success" onclick="startAll()">▶️ Start All</button>
+                <button class="btn btn-danger" onclick="stopAll()">⏹️ Stop All</button>
+                <button class="btn btn-danger" onclick="clearAll()">🗑️ Clear All</button>
+            </div>
+            
+            <div class="message-list" id="message-list">
+                <p style="text-align: center; color: #666;">No messages added yet</p>
+            </div>
+        </div>
+    </div>
+    
+    <script>
+        let ws;
+        let messages = [];
+        let txCount = 0;
+        
+        function initWebSocket() {
+            ws = new WebSocket('ws://' + window.location.hostname + ':81');
+            
+            ws.onopen = function() {
+                console.log('WebSocket connected');
+                document.getElementById('connection-status').innerHTML = '🟢 Connected';
+            };
+            
+            ws.onclose = function() {
+                console.log('WebSocket disconnected');
+                document.getElementById('connection-status').innerHTML = '🔴 Disconnected';
+                setTimeout(initWebSocket, 3000);
+            };
+            
+            ws.onmessage = function(event) {
+                const data = JSON.parse(event.data);
+                if (data.type === 'txStatus') {
+                    txCount = data.count;
+                    document.getElementById('tx-count').textContent = 'Sent: ' + txCount + ' messages';
+                }
+            };
+        }
+        
+        function addMessage() {
+            const id = document.getElementById('can-id').value.toUpperCase();
+            const type = document.getElementById('msg-type').value;
+            const dlc = parseInt(document.getElementById('dlc').value);
+            const interval = parseInt(document.getElementById('interval').value);
+            
+            if (!id || !/^[0-9A-F]+$/.test(id)) {
+                alert('Invalid CAN ID! Use hex format (e.g., 123, 1A2)');
+                return;
+            }
+            
+            const data = [];
+            for (let i = 0; i < 8; i++) {
+                const val = document.getElementById('d' + i).value.toUpperCase();
+                if (!/^[0-9A-F]{0,2}$/.test(val)) {
+                    alert('Invalid data byte D' + i + '! Use hex format (00-FF)');
+                    return;
+                }
+                data.push(val.padStart(2, '0'));
+            }
+            
+            const msg = {
+                id: id,
+                type: type,
+                dlc: dlc,
+                data: data,
+                interval: interval,
+                active: false
+            };
+            
+            messages.push(msg);
+            updateMessageList();
+        }
+        
+        function sendOnce() {
+            const id = document.getElementById('can-id').value.toUpperCase();
+            const type = document.getElementById('msg-type').value;
+            const dlc = parseInt(document.getElementById('dlc').value);
+            
+            const data = [];
+            for (let i = 0; i < 8; i++) {
+                data.push(document.getElementById('d' + i).value.toUpperCase().padStart(2, '0'));
+            }
+            
+            sendCanMessage(id, type, dlc, data);
+        }
+        
+        function sendCanMessage(id, type, dlc, data) {
+            const cmd = {
+                cmd: 'sendCan',
+                id: id,
+                type: type,
+                dlc: dlc,
+                data: data.join('')
+            };
+            ws.send(JSON.stringify(cmd));
+            console.log('Sent:', cmd);
+        }
+        
+        function updateMessageList() {
+            const list = document.getElementById('message-list');
+            
+            if (messages.length === 0) {
+                list.innerHTML = '<p style="text-align: center; color: #666;">No messages added yet</p>';
+                return;
+            }
+            
+            list.innerHTML = '';
+            messages.forEach((msg, index) => {
+                const item = document.createElement('div');
+                item.className = 'message-item' + (msg.active ? ' active' : '');
+                
+                item.innerHTML = `
+                    <div class="message-id">0x${msg.id}</div>
+                    <div class="message-type type-${msg.type}">${msg.type.toUpperCase()}</div>
+                    <div class="message-data">${msg.data.slice(0, msg.dlc).join(' ')}</div>
+                    <div class="message-interval">Every ${msg.interval}ms</div>
+                    <div class="message-controls">
+                        <button class="btn ${msg.active ? 'btn-danger' : 'btn-success'} btn-small" 
+                                onclick="toggleMessage(${index})">
+                            ${msg.active ? '⏹️ Stop' : '▶️ Start'}
+                        </button>
+                        <button class="btn btn-danger btn-small" onclick="deleteMessage(${index})">
+                            🗑️
+                        </button>
+                    </div>
+                `;
+                
+                list.appendChild(item);
+            });
+        }
+        
+        function toggleMessage(index) {
+            messages[index].active = !messages[index].active;
+            
+            const cmd = {
+                cmd: messages[index].active ? 'startMsg' : 'stopMsg',
+                index: index,
+                id: messages[index].id,
+                type: messages[index].type,
+                dlc: messages[index].dlc,
+                data: messages[index].data.join(''),
+                interval: messages[index].interval
+            };
+            
+            ws.send(JSON.stringify(cmd));
+            updateMessageList();
+        }
+        
+        function deleteMessage(index) {
+            if (messages[index].active) {
+                ws.send(JSON.stringify({cmd: 'stopMsg', index: index}));
+            }
+            messages.splice(index, 1);
+            updateMessageList();
+        }
+        
+        function startAll() {
+            messages.forEach((msg, index) => {
+                if (!msg.active) {
+                    toggleMessage(index);
+                }
+            });
+        }
+        
+        function stopAll() {
+            ws.send(JSON.stringify({cmd: 'stopAll'}));
+            messages.forEach(msg => msg.active = false);
+            updateMessageList();
+        }
+        
+        function clearAll() {
+            if (confirm('Clear all messages?')) {
+                stopAll();
+                messages = [];
+                updateMessageList();
+            }
+        }
+        
+        // Hex input validation
+        document.querySelectorAll('input[id^="d"]').forEach(input => {
+            input.addEventListener('input', function() {
+                this.value = this.value.toUpperCase().replace(/[^0-9A-F]/g, '');
+            });
+        });
+        
+        document.getElementById('can-id').addEventListener('input', function() {
+            this.value = this.value.toUpperCase().replace(/[^0-9A-F]/g, '');
+        });
+        
+        initWebSocket();
+    </script>
+</body>
+</html>
+)rawliteral";
+
+#endif
\ No newline at end of file
