Connection Problem with Python server with UE4 Client

[talal0047]

I want to create a simple connection with the server made using flask and an unreal client. The thing is that my python server run just fine as if I connect using a client written in python then they just connect perfectly. But my Ue4 client don't connect with my python server. Below is the python server I have written using flask_socketio

Another thing I must add is that the ue4 client just connect fine with node.js server. So, the connection problem is only with python server. I will attach the code of node server also.

below are the setting of Ue4 I am using.

If anything more is required regarding this kindly let me know.

Thank you any kind of help would be appreciated.

[MichaelJCole]

Have you tried connecting with to socket.io server? I haven't heard of flask_socketio, but it may not work as advertised.

[talal0047]

Have you tried connecting with to socket.io server? I haven't heard of flask_socketio, but it may not work as advertised.

Yep I tried that also, same results with that, the test python would connect to it but the Ue4 client would not connect to the python server

[MichaelJCole]

@talal0047 That's not what I asked. Did you get Ue4 to connect to a node Socket.io server? You may need help from the flask_socketio project instead.

[talal0047]

@talal0047 That's not what I asked. Did you get Ue4 to connect to a node Socket.io server? You may need help from the flask_socketio project instead.

oh my mistake, yep I was able to connect to node.js socket.io server from ue4 socket.io client but was not able to connect to python socket.io server

[getnamo]

Do you know what version of socket.io protocol the python server uses? It may be related to https://github.com/getnamo/socketio-client-ue4/issues/245 (and now v4 support...)

[ndbs-tsb]

I'm not sure if this is the same issue, but I am upgrading a project from 4.25 (with Socket IO Client 1.4.0) to 4.26, and I cannot get the client to work in 4.26. I, too, use a Python Socket.io server (python-socketio version 4.3.1). However, in my case the 4.25 project works fine with the server, while the 4.26 project does not (same server version). On 4.26 I have tried both the 1.5.5 version from the marketplace and the 1.6.0 available on GitHub. These are the log messages that both generate in Unreal:

SocketIO: SocketIO Connected with session: dbafd50ea72c4246a258b2a5e1084dd9
SocketIO: SocketIO dbafd50ea72c4246a258b2a5e1084dd9 connected to namespace: /
SocketIO: SocketIO Disconnected dbafd50ea72c4246a258b2a5e1084dd9 reason: CLOSE_REASON_NORMAL
SocketIO: SocketIO dbafd50ea72c4246a258b2a5e1084dd9 disconnected from namespace: /
SocketIO: SocketIO Invalid appears to have lost connection, reconnecting attempt 0 with delay 5000
SocketIO: SocketIO Invalid appears to have lost connection, reconnecting attempt 0 with delay 5000

On the server it looks like the client connects and then immediately disconnects.

[getnamo]

See https://github.com/getnamo/SocketIOClient-Unreal#socketio-server-compatibility. Check your server protocol version

[ndbs-tsb]

See https://github.com/getnamo/SocketIOClient-Unreal#socketio-server-compatibility. Check your server protocol version

Thanks. I have now tried upgrading my python-socketio server to 5.7.1 which should support 3.x/4.x, but I'm getting the exact same behaviour. Also, I would have expected version 1.5.5 to work with the other server version.

[ndbs-tsb]

See https://github.com/getnamo/SocketIOClient-Unreal#socketio-server-compatibility. Check your server protocol version

Thanks. I have now tried upgrading my python-socketio server to 5.7.1 which should support 3.x/4.x, but I'm getting the exact same behaviour. Also, I would have expected version 1.5.5 to work with the other server version.

A quick follow-up: this works with the JS reference implementation of socket.io, so I have to conclude that there is something amiss in the Python implementation.