void Start()
{
    // Initialize SignalR
    var signalR = new SignalR();
    signalR.Init("<SignalRHubURL>");

    // Handler callbacks
    signalR.On("<HandlerNameA>", (string payload) =>
    {
        // Deserialize payload A from JSON
        var json = JsonUtility.FromJson<JsonPayload>(payload);
        Debug.Log($"<HandlerNameA>: {json.message}");
    });
    signalR.On("<HandlerNameB>", (string payload) =>
    {
        // Deserialize payload B from JSON
        var json = JsonUtility.FromJson<JsonPayload>(payload);
        Debug.Log($"<HandlerNameB>: {json.message}");
    });

    // Connection callbacks
    signalR.ConnectionStarted += (object sender, ConnectionEventArgs e) =>
    {
        // Log the connected ID
        Debug.Log($"Connected: {e.ConnectionId}");

        // Send payload A to hub as JSON
        var json1 = new JsonPayload
        {
            message = "<MessageToSendA>"
        };
        signalR.Invoke("<HubMethodA>", JsonUtility.ToJson(json1));

        // Send payload B to hub as JSON
        var json2 = new JsonPayload
        {
            message = "<MessageToSendB>"
        };
        signalR.Invoke("<HubMethodB>", JsonUtility.ToJson(json2));
    };
    signalR.ConnectionClosed += (object sender, ConnectionEventArgs e) =>
    {
        // Log the disconnected ID
        Debug.Log($"Disconnected: {e.ConnectionId}");
    };

    signalR.Connect();
}

[Serializable]
public class JsonPayload
{
    public string message;
}