You can define a route to be either L7 ("http", "https") or L4 ("tcp", "tls"). For L7 routes you can use the usual routing parameters that were already available in Kong, like routing by host, by paths (prefix or regex-based) and/or by method. For stream routing, you can route by IP source port, IP destination port and/or by SNI in the case of TLS connections.
Can you elaborate? What kinds of routing parameters and rules can Kong use to route raw TCP traffic?