我贴出代码，这个问题卡了快一周了很多办法都尝试了，还是不能解决。

问题前景：与蓝牙设备连接进行指令交互

/**

* 连接低功耗蓝牙设备。

*/

BLEConn: function() {

const that = this;

wx.createBLEConnection({

deviceId: that.data.deviceId,

success: function(res) {

console.log('createBLEConnection success');

wx.stopBluetoothDevicesDiscovery({

success: function(res) {

console.log('stopBluetoothDevicesDiscovery success');

}

})

that.getBLEDeviceServices();

that.data.connected = true;

},

fail: function(res) {

console.log('createBLEConnection fail');

}

})

},

/**

* 获取蓝牙设备所有服务(service)

*/

getBLEDeviceServices() {

const that = this;

wx.getBLEDeviceServices({

deviceId: that.data.deviceId,

success: function(res) {

console.log('getBLEDeviceServices success');

for (let i = 0; i < res.services.length; i++) {

if (res.services[i].uuid.indexOf("BA11F08C") != -1) {

that.setData({

serviceId : res.services[i].uuid,

})

setTimeout( function() { that.getBLEDeviceCharacteristics(res.services[i].uuid);

},1500);

}

}

},

fail: function(res) {

console.log('getBLEDeviceServices fail');

}

})

},

/**

* 获取蓝牙设备某个服务中所有特征值(characteristic)

*/

getBLEDeviceCharacteristics(serviceId) {

const that = this;

wx.getBLEDeviceCharacteristics({

deviceId: that.data.deviceId,

serviceId: serviceId,

success: function(res) {

console.log('getBLEDeviceCharacteristics success');

let item = res.characteristics

for (let i = 0; i < item.length; i++) {

if (item[i].uuid.indexOf("CD01") != -1) {

that.setData({

cd01 : item[i].uuid,

})

}

if (item[i].uuid.indexOf("CD02") != -1) {

that.setData({

cd02: item[i].uuid,

})

}

if (item[i].uuid.indexOf("CD03") != -1) {

that.setData({

cd03: item[i].uuid,

})

}

if (item[i].uuid.indexOf("CD04") != -1) {

that.setData({

cd04: item[i].uuid,

})

}

if (item[i].properties.write && writeFlag) {

that.data.writeCha = item[i].uuid;

that.data.writeSer = serviceId;

}

}

wx.onBLECharacteristicValueChange(function (msg) {

if (msg.characteristicId.indexOf("CD01") != -1) {

console.log(`蓝牙设备发送的指令:${ab2hex(msg.value)}`)

console.log('----------------------')

}

if (msg.characteristicId.indexOf("CD04") != -1) {

console.log(`蓝牙设备发送的数据:${ab2hex(msg.value)}`)

console.log('----------------------')

let temp = ab2hex(msg.value).slice(6, 10);

console.log(`截取后的temp:${temp}`)

if (that.data.temperature && temp.indexOf('0e') === 0) {

console.log(`设备发送的数据转化为温度:${theTemperature(temp)}`);

}

}

})

wx.notifyBLECharacteristicValueChange({

deviceId: that.data.deviceId,

serviceId: that.data.serviceId,

characteristicId: that.data.cd01,

state: true,

success: function (res) {

console.log(`${that.data.cd01}:notifyBLECharacteristicValueChange success`);

},

fail: function (res) {

console.log('notifyBLECharacteristicValueChange fail');

}

})

wx.notifyBLECharacteristicValueChange({

deviceId: that.data.deviceId,

serviceId: that.data.serviceId,

characteristicId: that.data.cd02,

state: true,

success: function (res) {

console.log(`${that.data.cd02}:notifyBLECharacteristicValueChange success`);

},

fail: function (res) {

console.log('notifyBLECharacteristicValueChange fail');

}

})

wx.notifyBLECharacteristicValueChange({

deviceId: that.data.deviceId,

serviceId: that.data.serviceId,

characteristicId: that.data.cd03,

state: true,

success: function (res) {

console.log(`${that.data.cd03}:notifyBLECharacteristicValueChange success`);

},

fail: function (res) {

console.log('notifyBLECharacteristicValueChange fail');

}

})

wx.notifyBLECharacteristicValueChange({

deviceId: that.data.deviceId,

serviceId: that.data.serviceId,

characteristicId: that.data.cd04,

state: true,

success: function (res) {

console.log(`${that.data.cd04}:notifyBLECharacteristicValueChange success`);

},

fail: function (res) {

console.log('notifyBLECharacteristicValueChange fail');

}

})

},

fail: function(res) {

console.log('getBLEDeviceCharacteristics fail ');

}

})

},

/**

* 写操作

*/

sendMsg:function () {

const that = this

let buffer = hexStringToArrayBuffer(that.data.sendStr);

wx.writeBLECharacteristicValue({

deviceId: that.data.deviceId,

serviceId: that.data.writeSer,

characteristicId: that.data.writeCha,

value: buffer,

success: function (res) {

console.log('writeBLEValue success', res.errMsg)

console.log(`写入的数据:${ab2hex(buffer)}`)

},

fail: function (res) {

console.log('writeBLEValue fail', res.errMsg)

}

})

},