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node-red-nodes/hardware/scanBLE/101-scanBLE.js

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/**
* scanBLE.js
* Scans for a specific Bluetooth 4 (BLE) Device (by Name and UUID)
* Returns the Name the of Device when found and stops scanning
* Requires Noble: https://github.com/sandeepmistry/noble
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* Copyright 2013 Charalampos Doukas - @BuildingIoT
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
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//might need to modify accordingly
var RED = require(process.env.NODE_RED_HOME+"/red/red");
//import noble
var noble = require('noble');
// The main node definition - most things happen in here
function BleScan(n) {
// Create a RED node
RED.nodes.createNode(this,n);
var msg = {};
var ble_name;
var node = this;
//get name and uuid from user
this.ble_name = n.ble_name;
this.ble_uuid = n.ble_uuid;
this.on("input", function(msg){
noble.startScanning();
});
noble.on('scanStart', function(msg) {
var msg = {};
msg.topic = node.topic;
msg.payload = "Scanning initiated..." //debugging
//console.log('scanning initiated...');
node.send(msg);
});
noble.on('discover', function(peripheral) {
var msg = {};
msg.topic = node.topic;
msg.payload = "not found";
//check for the device name and the UUID (first one from the UUID list)
if(peripheral.advertisement.localName==node.ble_name && peripheral.advertisement.serviceUuids[0]==node.ble_uuid) {
msg.payload=peripheral.advertisement.localName;
noble.stopScanning(); }
node.send(msg);
});
this.on("close", function() {
try { noble.stopScanning(); }
catch (err) { console.log(err); }
});
}
// Register the node by name. This must be called before overriding any of the
// Node functions.
RED.nodes.registerType("scanBLE", BleScan);