Listen for signalr notifications

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C#

Hi all, my API recieves notifications from a Postgresql database when certain events happen in the database server, as I stated in a previous question I would like to forward these notifications to the client. I've been told I need to use a separate server such as SignalR to achieve this. I've added the required SignalR bits in Startup to my API ( net Core API )

 app.UseEndpoints(endpoints =>
 {
    endpoints.MapHub<SignalHub>("/signalclient");
 });
// SignalHub inherits from Hub
// added this in ConfigureServices
services.AddSignalR();

// I get this via di in my Controller

IHubContext<SignalHub> hubContext

// I issue this call from my Controller action

this.hubContext.Clients.All.SendAsync("ReceivePostgresNotification",e);

// which seems to execute ok

So my question is ?, how do I subscribe to these notifications from my client ( primarily my web app ) I hope this makes sense

What I have tried:

Added the SignalR code to the API and googling until I'm blue in the face