The Arduino Reference text is licensed under a Creative Commons Attribution-Share Alike 3.0 License.

Find anything that can be improved? Suggest corrections and new documentation via GitHub.

Doubts on how to use Github? Learn everything you need to know in this tutorial.

Reference > Libraries > Arduinoble > Blecharacteristic.subscribed

ArduinoBLE - bleCharacteristic.subscribed()

Query if the characteristic has been subscribed to by another Bluetooth® Low Energy device.

Syntax

bleCharacteristic.subscribed()

Parameters

None

Returns

  • true if the characteristic value has been subscribed to by another Bluetooth® Low Energy device,
  • false otherwise

Example


// Bluetooth® Low Energy Battery Level Characteristic
BLEUnsignedCharCharacteristic batteryLevelChar("2A19",  // standard 16-bit characteristic UUID
    BLERead | BLENotify); // remote clients will be able to get notifications if this characteristic changes





  if (batteryLevelChar.subscribed()) {
     // set a new value , that well be pushed to subscribed Bluetooth® Low Energy devices
    batteryLevelChar.writeValue(0xab);
  }