Cordova - automatically connect to a Bluetooth device by name

index-autoconnect.js

var app = {
    initialize: function() {
        document.addEventListener('deviceready', this.onDeviceReady.bind(this), false);
    },

    onDeviceReady: function() {
        // Auto connect whenever the device is in range
        const MAC_ADDRESS = 'E4:86:1E:4E:5A:FB';
        ble.autoConnect(MAC_ADDRESS, app.onConnected, app.onDisconnected);
    },

    onConnected: function(peripheral) {
        console.log(`Connected to peripheral ${peripheral.name} ${peripheral.id}`);
        // additional logic here
    },

    onDisconnected: function(peripheral) {
        if (peripheral.name) {
            console.log(`Peripheral ${peripheral.name} disconnected`);
        } else { // sometimes it's just an error message
            console.log(peripheral);
        }
    }
};

app.initialize();

index-connect-by-MAC.js

var app = {
    initialize: function() {
        document.addEventListener('deviceready', this.onDeviceReady.bind(this), false);
    },

    onDeviceReady: function() {
        // connect by MAC address on startup
        const MAC_ADDRESS = 'E4:86:1E:4E:5A:FB';
        ble.connect(MAC_ADDRESS, app.onConnected, app.onDisconnected);
    },

    onConnected: function(peripheral) {
        console.log(`Connected to peripheral ${peripheral.name} ${peripheral.id}`);
        // additional logic here
    },

    onDisconnected: function(peripheral) {
        if (peripheral.name) {
            console.log(`Peripheral ${peripheral.name} disconnected`);
        } else { // sometimes it's just an error message
            console.log(peripheral);
        }
    }
};

app.initialize();

index-connect-by-name.js

var app = {
    initialize: function() {
        document.addEventListener('deviceready', this.onDeviceReady.bind(this), false);
    },

    onDeviceReady: function() {
        this.connectByName('microbit');
    },

    connectByName: function(name) {

        let scanning = true;

        ble.startScan([], device => {
            if (device.name === name) {
                ble.stopScan();
                scanning = false;
                ble.connect(device.id, app.onConnected, app.onDisconnected);
            } else {
                console.log(`Skipping ${device.name} ${device.id}`);
            }
        });

        // set timer to stop the scan after a while
        setTimeout(() => {
            if (scanning) {
                ble.stopScan(); 
                console.log(`Couldn't find device ${name}`);
            }
        }, 5000);
    },

    onConnected: function(peripheral) {
        console.log(`Connected to peripheral ${peripheral.name} ${peripheral.id}`);
        // additional logic here
    },

    onDisconnected: function(peripheral) {
        if (peripheral.name) {
            console.log(`Peripheral ${peripheral.name} disconnected`);
        } else { // sometimes it's just an error message
            console.log(peripheral);
        }
    }
};

app.initialize();