Build environment: Windows
Moddable SDK version: 5.6.0
Target device: Windows

Description
I finally pulled latest (I've been staying stable on an October pull), and I'm finding that the io HTTP server / web socket listener handoff isn't working. I reverted to pure 5.6.0 (with none of my merges) and the sample code at examples/io/listener/httpserver demonstrates the same failure.

Steps to Reproduce

1. Build and run examples/io/listener/httpserver
2. No WebSocket onMessage trace messages will appear.

It appears that the client makes the connection and receives the completed negotiation from the server, and even sends the first "hello" message, but nothing more happens. The server never does a handoff because onDone on the WebSocketHandshake route is never called.