device disconnects immediately after connecting

[ClaeysJoke]

Hello! I am trying to connect with a temperature measuring device from Andesfit. However, after connecting with the device, it's immediately disconnected. Can any of you help? Thank you!

var app = {
    initialize: function() {
        document.addEventListener('deviceready', this.onDeviceReady.bind(this), false);
    },
    onDeviceReady: function() {
        this.receivedEvent('deviceready');
        this.startScanForDevices();
        //ble.autoConnect("B4:52:A9:C5:9D:6E",app.onConnected,app.onDisconnected);
    },
    receivedEvent: function(id) {
        var parentElement = document.getElementById(id);
        var listeningElement = parentElement.querySelector('.listening');
        var receivedElement = parentElement.querySelector('.received');

        listeningElement.setAttribute('style', 'display:none;');
        receivedElement.setAttribute('style', 'display:block;');

        console.log('Received Event: ' + id);
    },

    onDiscoverDevice: function(device){
        var devicediscovered=0;
        console.log(JSON.stringify(device));
        var listItem = document.createElement('li');
        listItem.innerHTML = device.name + '<br/>' +
            device.id + '<br/>' +
            'RSSI: ' + device.rssi;
        deviceList.appendChild(listItem);

        if(device.name=='TEMP'){
            console.log('temp found');
            console.log(device.id);
            ble.connect(device.id,app.onConnected,app.onDisconnected);
        }
    },

    onDisconnected:function(device){
        console.log('disconnected temp device');
    },

    onDisconnectedState:function(device){
        console.log('disconnected temp device state');
    },

    onConnected: function(device){
        console.log('connected with temp device');
        ble.isConnected(device.id, app.onConnected, app.onDisconnectedState);
        console.log(JSON.stringify(device));
        console.log('trying to start notification')
         ble.startNotification(device.id, "1809", "2A1C", app.onNotificationStarted, function() {
             console.log('start notification failed');
        });
    },

    onNotificationStarted: function(buffer){
        console.log('notification started');
        var data = new Uint8Array(buffer);
        console.log("Temp state changed to " + data[0]);
    },

    onNotification2Started: function(buffer){
        var data = new Uint8Array(buffer);
        console.log("Temp state 2 changed to " + data[0]);
    },

    startScanForDevices: function() { 
        console.log('scanning started');
        ble.startScan([], app.onDiscoverDevice, function() {
            console.log('scanning failed');
        });
        setTimeout(ble.stopScan,
            5000,
            function() { console.log("Scan complete"); },
            function() { console.log("stopScan failed"); }
        );
     } 
};

app.initialize();

[ClaeysJoke]

Update: if I remove "ble.startnotification", I get the feedback that it is disconnected from "onDisconnectedState" but not from "onDisconnected"

[don]

The device probably expects an initialization message after you connect. If there's no documentation, try using the manufacturers app and sniffing the bluetooth communication to see what it's doing.

[benplain]

@ClaeysJoke,

I found that with my devices (heart rate monitors), when I used ble.connect it dropped the connection instantly. However, when I use ble.autoConnect, it keeps the connection open and I don't get the instant disconnect.

I'm not sure if this is the correct way to do it but it works for me.

[Gargamil]

@ClaeysJoke,

I found that with my devices (heart rate monitors), when I used ble.connect it dropped the connection instantly. However, when I use ble.autoConnect, it keeps the connection open and I don't get the instant disconnect.

I'm not sure if this is the correct way to do it but it works for me.

I have exactly the same problem, but only on Android. iOS works with "normal" connect perfectly.