onBLECharacteristicValueChange

title: Taro.onBLECharacteristicValueChange(callback)

sidebar_label: onBLECharacteristicValueChange

Listens on the BLE device characteristic change event. You must enable notifyBLECharacteristicValueChange to receive notifications pushed by devices.

Reference

Type

(callback: Callback) => void

Parameters

Callback

The callback function for the BLE device characteristic change event.

(result: CallbackResult) => void

CallbackResult

Sample Code

// Example of an ArrayBuffer converted to a hexadecimal string
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 Support