Python WebSocket is not working on Raspbery

Question

Running the server and client on mac with localhost everything works fine.

Running the python program (server) on the raspberry pi and try to access it using its url doesn't work.

Python Server:

class Strompreisgenerator:
    def __init__(self):
        self.ws = websockets.serve(self.echo, 'localhost', 5001)
        asyncio.get_event_loop().run_until_complete(self.ws)
        asyncio.get_event_loop().run_forever()

    async def echo(self, websocket, path):
        async for message in websocket:
            print(message)

Javascript Client:

var ws = new WebSocket("ws://www.tobiasschmocker.ch:5001");

While trying to instantiate the WebSocket the error "WebSocket network error: The operation couldn’t be completed. Connection refused" occurs in safari.

The Port 5001 is open on RPi. I also tried local IP. I forwarded the Port on my router but still nothing. If i trie other urls i get another error, so i suppose the url is correct but i have no rights somehow.

On my RPi i have ssh enabled, also php, apache, mysql and all the pip packages for my python server.

If you know, where the problem lies, i'd be happy to know. Thank you very much!

Can you please write what happens when you run nc -v www.tobiasschmocker.ch 5001 — Yonatan Kiron
– Yonatan Kiron, Commented Feb 4, 2018 at 22:00
@YonatanKiron with nc -v www.tobiasschmocker.ch 5001 i get: nc: connect to www.tobiasschmocker.ch port 5001 (tcp) failed: Connection refused — agittarius
– agittarius, Commented Feb 6, 2018 at 1:09
@RetoAebersold I create an instance of the Strompreisgenerator further down in the code. I run the py-File from the terminal: python3 path/Strompreisgenerator.py . There is also a MQTT-Clients publishing in the program. The MQTT-Broker runs on port 1883 on www.tobiasschmocker.ch and for now i publish on the topic "Sarah" using a cronjob. I hope this is not interfering with the websocket. MQTT works fine, but the websocket doesnt. I have this problem only if i run the program on the RPi - on my mac it works fine. I'll keep the program running if you want to try out the Websocket or MQTT. — agittarius
– agittarius, Commented Feb 6, 2018 at 1:23
@agittarius and when you run it from your RPi, using the Doman name, localhost, and 127.0.0.1. — Yonatan Kiron
– Yonatan Kiron, Commented Feb 6, 2018 at 6:48

agittarius · Accepted Answer · 2018-02-20 14:25:35Z

5

Now the websocket is running and available via url from external!

Following is the solution for completeness. All I had to do is:

Update to Python Version 3.6. The websockets package seems to work only from Python Version 3.6. Here's the tutorial I used to install Python 3.6 on my RPi: https://gist.github.com/dschep/24aa61672a2092246eaca2824400d37f
use 0.0.0.0 instead of localhost as host within python. On sudo netstat -lptu in the RPi terminal, I could see that all the other ports (mqtt, ssh, etc) where set to 0.0.0.0 instead of localhost so I just tried and it works.

Having set all that, the websocket is now running. Thanks to @YonatanKiron & @Reto!

answered Feb 20, 2018 at 14:25

agittarius

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1 Comment

Dardan Iljazi Over a year ago

Thank you for your message, effectively using 0.0.0.0 solved my problem.

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