import asyncio
import datetime
import websockets


async def clock(websocket):
    while True:
        now = datetime.datetime.utcnow().isoformat() + 'Z'
        await websocket.send(now)
        await asyncio.sleep(5)


async def handler(websocket, path):
    while True:
        recv_task = asyncio.ensure_future(websocket.recv())
        done, pending = asyncio.wait([recv_task])

        if recv_task in done:
            result = recv_task.result()
            print("result = {}".format(result))
        else:
            print("no result")


start_server = websockets.serve(handler, 'localhost', 8088)

asyncio.get_event_loop().run_until_complete(start_server)
asyncio.get_event_loop().run_forever()