routes.swift

func routes(_ app: Application) throws {
    
    var webSocketClients = [WebSocket]()
    
    app.webSocket("commands") { request, ws in
        ws.send("Connection OK")
        
        webSocketClients.append(ws)
        
        ws.onText { ws, string in
            
            for client in webSocketClients {
                client.send(string + " : OK")
            }
        }

        ws.onClose.whenComplete { result in
          switch result {
          case .success():
            print("Closed")
          case .failure(let error):
            print("Failed to close connection \(error)")
          }
        }
    }
}