onBLECharacteristicValueChange

title: Taro.onBLECharacteristicValueChange(callback)

sidebar_label: onBLECharacteristicValueChange

监听低功耗蓝牙设备的特征值变化事件。必须先启用 notifyBLECharacteristicValueChange 接口才能接收到设备推送的 notification。

参考文档

类型

(callback: Callback) => void

参数

Callback

低功耗蓝牙设备的特征值变化事件的回调函数

(result: CallbackResult) => void

CallbackResult

示例代码

// ArrayBuffer转16进制字符串示例
function ab2hex(buffer) {
  let hexArr = Array.prototype.map.call(
    new Uint8Array(buffer),
    function(bit) {
      return ('00' + bit.toString(16)).slice(-2)
    }
  )
  return hexArr.join('');
}
Taro.onBLECharacteristicValueChange(function (res) {
  console.log(`characteristic ${res.characteristicId} has changed, now is ${res.value}`)
  console.log(ab2hex(res.value))
})

API 支持度