Reference   Language | Libraries | Comparison | Changes

ArduinoBLE : BLEService class

characteristicCount()

Description

Query the number of characteristics discovered for the BLE service.

Syntax

bleService.characteristicCount()

Parameters

None

Returns

The number of characteristics discovered for the BLE service.

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;
    }

    BLEService batteryService = peripheral.service("180f");

    if (batteryService) {
      // use the service
      int characteristicCount = batteryService.characteristicCount();

      Serial.print(characteristicCount);
      Serial.println(" characteristics discovered in battery service");
    } else {
      Serial.println("Peripheral does NOT have battery service");
    }

    // ...
  }
…
[Get Code]

See Also




Reference Home

Corrections, suggestions, and new documentation should be posted to the Forum.

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.