Tizen Developers

Since: 2.3.1

 var adapter = tizen.bluetooth.getDefaultAdapter();
 console.log("Bluetooth state: " + (adapter.powered ? "On" : "Off"));

Iqbal,

What if BT on watch in on, but on phone is off?

What if BT on watch in on, but phone is out of range?

My wearable app still can't retrieve data from web, I need a way to chek for this so I can handle or provide an alert!

Use 

getKnownDevices

Gets all the known devices that have information stored in the local Bluetooth adapter.

var adapter = tizen.bluetooth.getDefaultAdapter();

 function onGotDevices(devices) {
    console.log("Devices");
    for (var i = 0; i < devices.length; i++) {
        console.log(" Name: " + devices[i].name + ", Address: " + devices[i].address);
    }
    console.log("Total: " + devices.length);
 }

 function onError(e) {
   console.log ("Error: " + e.message);
 }

 function onBluetoothsetPowered() {
    adapter.getKnownDevices(onGotDevices, onError);
 }

 // Turns on Bluetooth
 adapter.setPowered(true, onBluetoothsetPowered);

getDevice

Gets the BluetoothDevice object for a given device hardware address.

function gotDeviceInfo(device) {
    console.log("Device Name: " + device.name);
    console.log("Device Address: " + device.address);
    console.log("Device Class: " + device.deviceClass.major);
    console.log("Is Bonded: " + (device.isBonded ? "Yes" : "No"));
 }

 function onError(e) {
    console.log ("Could not get device info:" + e.message);
 }

 var adapter = tizen.bluetooth.getDefaultAdapter();
 adapter.getDevice("35:F4:59:D1:7A:03", gotDeviceInfo, onError);

Ref: https://developer.tizen.org/development/api-references/web-application?redirect=/dev-guide/2.4/org.tizen.web.apireference/html/device_api/mobile/tizen/bluetooth.html#BluetoothAdapter::getKnownDevices