Server in gevent and other greenlets in the same app

I'm searching how to run server in gevent and other greenlets in one program. So I want to have server (multiple connections) and one or two other greenlets. Is this possible? If yes, then how?

Best regards, Matt.

from geventwebsocket import WebSocketServer, WebSocketApplication, Resource
import gevent

class EchoApplication(WebSocketApplication):
    def on_open(self):
        print ("Connection opened")

    def on_message(self, message):
        self.ws.send(message)

    def on_close(self, reason):
        print (reason)

def _test():
    while True:
        gevent.sleep(1)
        print ('other greenlet')

gevent.spawn(_test)

WebSocketServer(
('', 9007),
Resource({'/': EchoApplication})
).serve_forever()

this code is serving ws server and printing 'other greenlet' text :)