An example ping command. Assumes your modules are using the SocketCommandContext.

ping.cs

[Command("ping")]
[Alias("latency")]
[Summary("Shows the websocket connection's latency and time it takes for me send a message.")]
public async Task PingAsync()
{
    // start a new stopwatch to measure the time it takes for us to send a message
    var sw = Stopwatch.StartNew();

    // send the message and store it for later modification
    var msg = await ReplyAsync($"**Websocket latency**: {Context.Client.Latency}ms\n" +
                               "**Response**: ...");
    // pause the stopwatch
    sw.Stop();

    // modify the message we sent earlier to display measured time
    await msg.ModifyAsync(x => x.Content = $"**Websocket latency**: {Context.Client.Latency}ms\n" +
                                           $"**Response**: {sw.Elapsed.TotalMilliseconds}ms");
}