const sendStringToDevice = async () => {     try {         // Request Bluetooth device         const device = await navigator.bluetooth.requestDevice({             filters: [{ name: 'monocle' }],             optionalServices: [0x2A00],         });          // Connect to the device         const server = await device.gatt.connect();          // Get the specified service         const service = await server.getPrimaryService(0x2A00); // 使用服务 UUID          // Get the specified characteristic         const characteristic = await service.getCharacteristic(0x2A05); // 使用特征 UUID          // **重要：启动通知**         await characteristic.startNotifications();          characteristic.addEventListener('characteristicvaluechanged',             (event) => {                 // 从 event.target.value 读取数据                 const value = event.target.value;                 // 将 ArrayBuffer 转换为字符串                 let decoder = new TextDecoder('utf-8');                 let decodedString = decoder.decode(value);                 console.log('Received: ' + decodedString);             });          // Convert the string to a UInt8Array (assuming ASCII encoding)         const encoder = new TextEncoder('utf-8');         const data = encoder.encode(message);          // Send the data to the characteristic         await characteristic.writeValue(data);          console.log(`String "${message}" sent successfully to monocle`);     } catch (error) {         console.error('Error sending string to Bluetooth device:', error);     } };

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