ios、安卓都能发送数据，但是只有ios能接收到回传的数据 尝试了其他解决方法，设置MTU，设置延时都不行 js代码如下 const mtu = 512; wx.setBLEMTU({         deviceId: that.data.connectedDeviceId,         mtu,         success:(res)=>{           console.log("setBLEMTU success>>", res)         },         fail:(res)=>{           console.log("setBLEMTU fail>>", res)         }       }) wx.writeBLECharacteristicValue({         deviceId: that.data.connectedDeviceId,         serviceId: that.data.services[0].uuid,         characteristicId: that.data.characteristics[0].uuid,         value: buffer,         success: function (res) {           console.log('发送成功')           wx.showToast({             title: 'wifi id 发送成功',           })           setTimeout(function () {}, 1000); // 1秒延时           wx.notifyBLECharacteristicValueChange({             state: true,             deviceId: that.data.connectedDeviceId,             serviceId: that.data.services[0].uuid,             characteristicId: that.data.characteristics[0].uuid,             success: function (res) {               console.log('启用notify成功')               wx.onBLECharacteristicValueChange(function (res) {                 var receiveText = app.buf2string(res.value)                 console.log('接收到数据：' + receiveText)                 that.setData({                   receiveText: receiveText                 })               })             }           })         }       })