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Node.jsから周辺のBLEデバイスを探すサンプル

Posted at

nobleの新しい感じのサンプルがなかったので書いてみる。

  • macOS Sierra
  • Node.js v8.1.2

準備

$ npm init -y
$ npm i --save noble

このバージョンだとnpm install時にwarningが出るけど問題なく動作します。

コード

app.js
'use strict';
 
const noble = require('noble');
const knownDevices = [];

//discovered BLE device
const discovered = (peripheral) => {
    const device = {
        name: peripheral.advertisement.localName,
        uuid: peripheral.uuid,
        rssi: peripheral.rssi
    };
    knownDevices.push(device);
    console.log(`${knownDevices.length}:${device.name}(${device.uuid}) RSSI${device.rssi}`);
}

//BLE scan start
const scanStart = () => {
    noble.startScanning();
    noble.on('discover', discovered);
}

if(noble.state === 'poweredOn'){
    scanStart();
}else{
    noble.on('stateChange', scanStart);
}

実行

$ node app.js
1:<デバイス名称>(<UUID>) RSSI-75
2:<デバイス名称>(<UUID>) RSSI85
3:<デバイス名称>(<UUID>) RSSI-49
・
・
・

デバイスが見つかる度にコンソールに表示されます。

参考: ノンプログラマでもコピペでOK!JavaScriptを使ってDroneを飛ばそう

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