萌新小白。。用了蓝牙BLE的API调试了一下新买的蓝牙ble-rc6621A,在page里面，连接到蓝牙之后向蓝牙发送了一个字符串'getid'，串口调试助手接收到。写了一个按钮触发事件向蓝牙发送同样的字符串，这时候串口助手就没有收到了。但是通过调试器的log信息知道确实是写入成功了success。。有没有大神帮帮，以下是js逻辑代码 // index.js // 获取应用实例 const app = getApp() Page({   data: {     'deviceId':'',     'serviceId':'',     'characteristicId':''   },   onLoad() {     this.bleInit();   },   bleInit() {     console.log('searchBle')     // 监听扫描到新设备事件     wx.onBluetoothDeviceFound((res) => {       res.devices.forEach((device) => {         // 这里可以做一些过滤         console.log('Device Found', device)         if(device.deviceId == "2E209DD5-18CD-C223-8403-A2A0C1AD89CA"){           // 找到设备开始连接           this.bleConnection(device.deviceId);           wx.stopBluetoothDevicesDiscovery()         }       })       // 找到要搜索的设备后，及时停止扫描       //      })     // 初始化蓝牙模块     wx.openBluetoothAdapter({       mode: 'central',       success: (res) => {         // 开始搜索附近的蓝牙外围设备         wx.startBluetoothDevicesDiscovery({           allowDuplicatesKey: false,         })       },       fail: (res) => {         if (res.errCode !== 10001) return         wx.onBluetoothAdapterStateChange((res) => {           if (!res.available) return           // 开始搜寻附近的蓝牙外围设备           wx.startBluetoothDevicesDiscovery({             allowDuplicatesKey: false,           })         })       }     })     var that = this     wx.onBLECharacteristicValueChange((result) => {       console.log('onBLECharacteristicValueChange',result.value)       let hex = that.ab2hex(result.value)       console.log('hextoString',that.hextoString(hex))       console.log('hex',hex)     })   },   bleConnection(deviceId){     wx.createBLEConnection({       deviceId, // 搜索到设备的 deviceId       success: () => {         // 连接成功，获取服务         console.log('连接成功，获取服务')         this.bleGetDeviceServices(deviceId)       }     })   },   bleGetDeviceServices(deviceId){     wx.getBLEDeviceServices({       deviceId, // 搜索到设备的 deviceId       success: (res) => {         console.log(res.services)         for (let i = 0; i < res.services.length; i++) {           if (res.services[i].isPrimary) {             // 可根据具体业务需要，选择一个主服务进行通信             this.bleGetDeviceCharacteristics(deviceId,res.services[i].uuid)           }         }       }     })   },   bleGetDeviceCharacteristics(deviceId,serviceId){     wx.getBLEDeviceCharacteristics({       deviceId, // 搜索到设备的 deviceId       serviceId, // 上一步中找到的某个服务       success: (res) => {         for (let i = 0; i < res.characteristics.length; i++) {           let item = res.characteristics[i]           console.log(item)           if (item.properties.write) { // 该特征值可写             // 本示例是向蓝牙设备发送一个 0x00 的 16 进制数据             // 实际使用时，应根据具体设备协议发送数据             // let buffer = new ArrayBuffer(1)             // let dataView = new DataView(buffer)             // dataView.setUint8(0, 0)             // let senddata = 'FF';             // let buffer = this.hexString2ArrayBuffer(senddata);             var buffer = this.stringToBytes("getid")             this.setData({               'deviceId':deviceId,               'serviceId':serviceId,               'characteristicId':item.uuid             })             wx.writeBLECharacteristicValue({               deviceId,               serviceId,               characteristicId: item.uuid,               value: buffer,             })           }           if (item.properties.read) { // 改特征值可读             wx.readBLECharacteristicValue({               deviceId,               serviceId,               characteristicId: item.uuid,             })           }           if (item.properties.notify || item.properties.indicate) {             // 必须先启用 wx.notifyBLECharacteristicValueChange 才能监听到设备 onBLECharacteristicValueChange 事件             wx.notifyBLECharacteristicValueChange({               deviceId,               serviceId,               characteristicId: item.uuid,               state: true,             })           }         }       }     })   },   stringToBytes(str) {     var array = new Uint8Array(str.length);     for (var i = 0, l = str.length; i < l; i++) {       array[i] = str.charCodeAt(i);     }     console.log(array);     return array.buffer;   },   hextoString: function (hex) {     var arr = hex.split("")     var out = ""     for (var i = 0; i < arr.length / 2; i++) {       var tmp = "0x" + arr[i * 2] + arr[i * 2 + 1]       var charValue = String.fromCharCode(tmp);       out += charValue     }     return out   },   ab2hex(buffer) {     var hexArr = Array.prototype.map.call(       new Uint8Array(buffer),       function (bit) {         return ('00' + bit.toString(16)).slice(-2)       }     )     return hexArr.join('');   },      light1on(){     var buffer = this.stringToBytes("light1on")     wx.writeBLECharacteristicValue({       deviceId:this.data.deviceId,       serviceId:this.data.serviceId,       characteristicId:this.data.characteristicId,       value: buffer,     })   },   light2on(){     var buffer = this.stringToBytes("light2on")     wx.writeBLECharacteristicValue({       deviceId:this.data.deviceId,       serviceId:this.data.serviceId,       characteristicId:this.data.characteristicId,       value: buffer,     })   },   light1off(){     var buffer = this.stringToBytes("light1off")     wx.writeBLECharacteristicValue({       deviceId:this.data.deviceId,       serviceId:this.data.serviceId,       characteristicId:this.data.characteristicId,       value: buffer,     })   },   light2off(){     var buffer = this.stringToBytes("light2off")     wx.writeBLECharacteristicValue({       deviceId:this.data.deviceId,       serviceId:this.data.serviceId,       characteristicId:this.data.characteristicId,       value: buffer,     })   },    })