Related, I have loved using toxiproxy for testing latency with my services. Tools like this are great for uncovering subtle bugs and helping to learn more about how various transports / protocols handle things. I successfully used toxiproxy to simulate an end user problem with a websocket based tool and I don't know how I would have done it otherwise.

https://github.com/Shopify/toxiproxy

Go is a great tool for simulating network concepts, I've done it too.

Learning this at uni this semester. This looks super cool, thanks!