writeBLECharacteristicValue 写入问题 - WXOPEN Club

//向低功耗蓝牙设备特征值中写入二进制数据

writeBLECharacteristicValue: function (e) {

var that = this;

wx.onBLECharacteristicValueChange(function (characteristic) {

that.setData({

msg_3: JSON.stringify(characteristic)

})

// 向蓝牙设备发送一个0x00的16进制数据

let buffer = new ArrayBuffer(4)

let dataView = new DataView(buffer)

dataView.setUint8(0, 0x0D)

dataView.setUint8(1, 0x02)

dataView.setUint8(2, 0x11)

dataView.setUint8(3, 0x13)

wx.writeBLECharacteristicValue({

deviceId: that.data.deviceId,

serviceId: that.data.uuid,

characteristicId: that.data.characteristicId,

value: buffer,

success: function (res) {

that.setData({

msg_2: JSON.stringify(res)

})

}

})

},

请问 value: buffer, 这样写对吗？

显示是成功写入的，但 onBLECharacteristicValueChange 没有回调信息

你这样写多的吗？

onBLECharacteristicValueChange 是需要以下情况才会有回调