postmarker | Python client library for Postmark API | Email library

It would be easier to undestand the problem if you had added ajax http request + response logs as well (status and payloads). However, application output says 400 bad request for your API method ivocation.

Based on your resource class you have three properties declared as [Required] (except Id) : Longitude, Latitude, Estado, but in your ajax call you are passing only ID and Estado. More likely (if you are using asp.net validation) you have 400 response because of missing required properties in your ajax request body. Try to add missing properties data: JSON.stringify({ Id: idmarcador, Estado: novoEstado, string: latitude, string: longitude })

As per your comment, you are targeting .NET Core 2.1, but the UseEndpoints extension method was introduced in 3.0.

To add SignalR in 2.1, firstly make sure you have services.AddSignalR(); in your ConfigureServices method. Secondly, you should use app.UseSignalR in the Configure method, instead of UseEndpoints.

Like so:

In SignalR, a Hub is basically the collection of “methods” that a client can call. So this is the interface the client works with, just like a controller would work for a web API.

If you want to call methods on the clients, then using the hub is not the right approach. Instead, you want to use the IHubContext. You will need to inject that into your controller.

A SignalR IHubContext provides a means of sending messages to your clients outside of a Hub instance. The sample at https://docs.microsoft.com/en-us/aspnet/core/signalr/hubcontext?view=aspnetcore-3.1 provides an example. Using the code there as a starting point, you can:

Inject the IHubContext into your controller, assuming that it is named HomeController: