Make my python's Bluetooth server visible to iOS

I've been struggling to connect a Bluetooth server (using Bluez or similar) in a Python script which runs on a Linux service, with an iPhone device which runs a Cordova hybrid app.

I'm using cordova-plugin-ble-central for the latter, and for the former I give you the code below:

try:
    server_sock = BluetoothSocket(RFCOMM)

    server_sock.bind(("", 0))
    server_sock.listen(1)
    port = server_sock.getsockname()[1]

    uuid = "d507688e-5fa7-11e7-907b-a6006ad3dba0"
    advertise_service(server_sock, "TestService", service_id=uuid, service_classes=[uuid])

    print("Waiting for connection on RFCOMM channel %d" % port)

    client_sock, address = server_sock.accept()
    print "Accepted connection from ", address

    data = client_sock.recv(1024)
    print "received [%s]" % data

    client_sock.close()
    server_sock.close()
except Exception as e:
    print 'ERROR: ' + str(e)

The issue is that a "scan()" function result from the iPhone gives me several devices nearby, but not mine...in Android it works great off course!

What am I missing? Is there a way to make it discover-able?

Thanks in advance