QoS insights at runtime

[jamesadevine]

Provide QoS statistics to end users (e.g. device manufactures, makers) for better identification of bus bottle necks.

[pelikhan]

So the idea is stuff the number of packets sent in the announce packet during this announce phase.

This allows a listener (like webusb) to:

• [ ] compute how many packets were missed from a particular device

Questions:

• [ ] what happens when annouce packets are missed? We should probably also have a counter for this

[pelikhan]

I stumbled on this. Is this active code @mmoskal ? We could surface this in a register.

    export function diagnostics(): jacdac.JDDiagnostics {
        return new jacdac.JDDiagnostics(jacdac.__physGetDiagnostics());
    }