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ArduinoBLE : BLEDevice class

characteristicCount()

Description

Query the number of characteristics discovered for the BLE device.

Syntax

bleDevice.characteristicCount()

Parameters

None

Returns

The number of characteristics discovered for the BLE device.

Example

…
  // begin initialization
  if (!BLE.begin()) {
    Serial.println("starting BLE failed!");

    while (1);
  }

  Serial.println("BLE Central scan");

  // start scanning for peripheral
  BLE.scan();

  // …

  BLEDevice peripheral = BLE.available();

  if (peripheral) {
    // ...

    Serial.println("Connecting ...");

    if (peripheral.connect()) {
      Serial.println("Connected");
    } else {
      Serial.println("Failed to connect!");
      return;
    }

    // discover peripheral attributes
    Serial.println("Discovering attributes ...");
    if (peripheral.discoverAttributes()) {
      Serial.println("Attributes discovered");
    } else {
      Serial.println("Attribute discovery failed!");
      peripheral.disconnect();
      return;
    }

    int characteristicCount = peripheral.characteristicCount();

    Serial.print(characteristicCount);
    Serial.println(" characteristis discovered");

    // ...
  }
…
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The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.