Not connect to socket io server on android

[DamaSistem]

Hi there, I couldn't get it to connect on the Android phone. It works fine in Unity editor. Scripting backend IL2CPP api Compatibility level .Net Framework. I also use server-side codes in another react native application. I don't think there is a problem on the server side. Socket versions Unity side v1.0.0 , server side v4.1.3. I opened a project from scratch and pulled the unity side to v1.1.3 and the server side to v4.5.4, but it still didn't work. I would be glad if you can help.

[itisnajim]

try upgrading unity;
see #36

[devalvitec]

@itisnajim I am using the unity 2021.3.30f1 LTS version but I am not able to connect to the server on mobile devices, it's connecting fine with the editor.

Any help is highly appreciated.

[itisnajim]

try these:
#60

[AtulAbhiwan03]

it's not connecting with il2cpp in unity android

[ScottasM]

Anyone found a fix for this? Cant get it to work on android on 2021.3.8f1

[devalvitec]

@ScottasM update your Unity to 2022.3.10f1 or Change and try between the Faster (smaller) builds option/ Faster runtime option at player setting for Android. Faster runtime option might work.

[ScottasM]

@devalvitec Nope, still not working. Updated the unity version, tried changing the build options.

[ScottasM]

Im also building with il2cpp if that matters

[devalvitec]

what are the error exactly you are getting ?

[ScottasM]

@devalvitec Im getting no errors, nothing happens. Not even the OnError gets called.

[ScottasM]

Okay, after 4 days of this torture i fixed it.
for any other lost souls out there here what was wrong :
Apparently android didnt trust my ssl certificate, and didnt print anything to logcat, so when i added all the events like OnReconnectFail, OnRecconectAttempt and etc. i finally saw the error.

what i had to do was :
cat certificate.crt ca_bundle.crt > chained.pem to generate the chained.pem file for android to trust

and then in my flask socketio app i changed the path to point from certificate.crt to chained.pem

[joyscoreinc]

@ScottasM
I've deployed my solution on cloud run so your solution can't be applied
The library must provide a way to set supported TLS encyrption like this
https://stackoverflow.com/questions/68268113/how-can-unity-connect-with-secure-websocket-based-on-node-js/68280594#68280594

[itisnajim]

@ScottasM

I've deployed my solution on cloud run so your solution can't be applied

The library must provide a way to set supported TLS encyrption like this

https://stackoverflow.com/questions/68268113/how-can-unity-connect-with-secure-websocket-based-on-node-js/68280594#68280594

Try this if solve your issue:

doghappy/socket.io-client-csharp#94

[TiagoAndreAlmeida]

hey guys i stuck on this issue too, on local work on unity editor and android. but when trying to connect to server nothing happens.
i can connect to my remote server with my reactjs app normaly, just the unity no connect.
Unity version: 2023.3.34f1
this is my code on Unity:

`
socket = new SocketIOUnity(uri_url, new SocketIOOptions
{
EIO = 4
,
Transport = SocketIOClient.Transport.TransportProtocol.Polling
})
{
JsonSerializer = new NewtonsoftJsonSerializer()
};

    ///// reserved socketio events
    socket.OnConnected += (sender, e) =>
    {
        Debug.Log("socket.OnConnected");
    };
    socket.OnPing += (sender, e) =>
    {
        Debug.Log("Ping");
    };
    socket.OnPong += (sender, e) =>
    {
        Debug.Log("Pong: " + e.TotalMilliseconds);
    };
    socket.OnDisconnected += (sender, e) =>
    {
        Debug.Log("disconnect: " + e);
    };
    socket.OnReconnectAttempt += (sender, e) =>
    {
        Debug.Log($"OnReconnectAttempt: attempt = {e}");
    };
    socket.OnReconnectError += (sender, e) =>
    {
        Debug.Log($"OnReconnectError: attempt = {e}");
    };
    socket.OnReconnectFailed += (sender, e) =>
    {
        Debug.Log($"OnReconnectFailed: attempt = {e}");
    };
    socket.On("game", (response) =>
    {
        gameInfor = response.GetValue<WebsocketMessage>();
        if (gameInfor.eventType == "winner" && gameInfor.userId == userObject.userUid)
        {
            userObject.bolhas += gameInfor.amount;
            winnerColor = gameInfor.color;
            Debug.Log($"GANHOU {winnerColor} - {gameInfor.userId} - {gameInfor.eventType}");
        }
    });
    socket.ConnectAsync();
    `

i trying to use TransportProtocol.Polling and TransportProtocol.WebSocket but still same problem
on my reactjs app i connect to my socket io server using https protocol.
dont know what to do about this more

[TiagoAndreAlmeida]

i fix after doing this
o SocketIOOptions, i set AutoUpgrade to false.
now on my looks like this:
socket = new SocketIOUnity(uri_url, new SocketIOOptions { AutoUpgrade = false, EIO = 4 , Transport = SocketIOClient.Transport.TransportProtocol.Polling }) { JsonSerializer = new NewtonsoftJsonSerializer() };