Open a connection to a server at the specific {@code port} and {@code host}.
<p>
{@code host} can be a valid host name or IP address. The connect is done asynchronously and on success, a
{@link Connection} instance is supplied via the {@code connectHandler} instance
@param port the port
@param host the host
@param serverName the SNI server name
@return a reference to this, so the API can be used fluently
Open a connection to a server at the specific {@code port} and {@code host}. <p> {@code host} can be a valid host name or IP address. The connect is done asynchronously and on success, a {@link Connection} instance is supplied via the {@code connectHandler} instance
@param port the port @param host the host @param serverName the SNI server name @return a reference to this, so the API can be used fluently