write为true，但还是报10007

方法：

SendTap: function () {
  var that = this
  if (that.data.connected) {
    var buffer = new ArrayBuffer(that.data.inputText.length)
    var dataView = new Uint8Array(buffer)
    for (var i = 0; i < that.data.inputText.length; i++) {
      dataView[i] = that.data.inputText.charCodeAt(i)
    }
    wx.writeBLECharacteristicValue({
      deviceId: that.data.connectedDeviceId,
      serviceId: that.data.serviceId,
      characteristicId: that.data.characteristics,
      value: buffer,
      success: function (res) {
        console.log('发送成功')
      },
      fail:(err)=>{
          console.log(err)
         }
    })
  } else {
    wx.showModal({
      title: '提示',
      content: '蓝牙已断开',
      showCancel: false,
      success: function (res) {
        that.setData({
          searching: false
        })
      }
    })
  }
},