Scans for all nearby BLE devices to help with debugging connection issues.
📱 Click "Scan for BLE Devices" to search for nearby Bluetooth devices...
"""
scan_script = r'''
// Scan for BLE Devices function
async function scanForDevices() {
console.log('Scan function called - checking elements...');
const resultsEl = document.getElementById('scan-results');
const scanButton = document.getElementById('scan-button');
const loadingEl = document.getElementById('scan-loading');
const textEl = document.getElementById('scan-text');
console.log('Elements found:', { resultsEl, scanButton, loadingEl, textEl });
// Show loading state
scanButton.disabled = true;
loadingEl.style.display = 'inline-block';
textEl.textContent = 'Scanning...';
resultsEl.textContent = '🔍 Searching for BLE devices (this may take up to 10 seconds)...';
console.log('Starting scan request...');
try {
const response = await fetch('scan');
let responseData;
try {
responseData = await response.json();
} catch (e) {
const text = await response.text();
throw new Error(`Invalid JSON response: ${text}`);
}
if (!response.ok) {
const errorDetail = responseData.detail || `HTTP error! status: ${response.status}`;
throw new Error(errorDetail);
}
const devices = responseData;
if (devices.length === 0) {
resultsEl.textContent = '📡 No BLE devices found.\n\nTroubleshooting tips:\n- Make sure your printer is powered on\n- Ensure Bluetooth is enabled on this device\n- Bring the printer closer (within 5 meters)\n- Try restarting the printer';
} else {
let resultText = '🎉 Found ' + devices.length + ' device(s):\n\n';
devices.forEach((d, index) => {
resultText += `${index + 1}. ${d.name || 'Unknown Device'}\n`;
resultText += ` Address: ${d.address}\n`;
// Handle case where RSSI might not be available
if (d.rssi !== undefined) {
resultText += ` Signal: ${d.rssi} dBm (${Math.abs(d.rssi) < 60 ? 'Strong' : Math.abs(d.rssi) < 80 ? 'Good' : 'Weak'})\n`;
} else {
resultText += ` Signal: Not available\n`;
}
if (d.metadata) {
resultText += ` Metadata: ${d.metadata}\n`;
}
resultText += ` ${'='.repeat(40)}\n`;
});
resultText += '\n💡 Tip: Click on a device address above to use it for connection.';
resultsEl.textContent = resultText;
}
} catch (e) {
resultsEl.textContent = '❌ Error during scan: ' + e.message + '\n\nPossible causes:\n- Bluetooth adapter not available\n- Missing permissions\n- Bluetooth service not running';
console.error('Scan error:', e);
} finally {
// Reset button state
console.log('Resetting button state...');
scanButton.disabled = false;
loadingEl.style.display = 'none';
textEl.textContent = 'Scan for BLE Devices (10s)';
console.log('Scan completed. Final result:', resultsEl.textContent);
}
}
'''
# Inject scan HTML after main content
if "" in template:
parts = template.split("", 1)
template = parts[0] + "" + scan_html + parts[1]
elif "
" in template:
parts = template.split("", 1)
template = parts[0] + scan_html + "" + parts[1]
else:
# Fallback if no main or body tag
template += scan_html
# Inject scan script before the closing tag of the main script
if "" in template:
parts = template.rsplit("", 1)
template = parts[0] + scan_script + "" + parts[1]
else:
# Fallback if no script tag found
template += f"