publish subscribes and new client ids

[mcollina]

• Publish each subscribe to "$SYS/broker-id/new/subscribes"
• Publish each clientId to "$SYS/broker-id/new/clients"
• Automatic disconnect clients connected to another broker

[mocheng]

Automatic disconnect clients connected to another broker

Should this logic be implemented in ascoltatori?
I suppose this feature can only be done with help of external storage. Mosca, besides persistence layer, doesn't touch external storage.

[mcollina]

First, that feature is defined in the MQTT spec, so it belongs here. As I propose to implement it, it needs no persistence layer, just an ascoltatori subscription to '$SYS/+/new/clients'. Does it sound feasible?

[mocheng]

Sounds good. I'll try on this.

[mocheng]

Update RedisPersistance to subscribe to 'new/clients' for some of its internal behavior

What kind of "internal behavior"?

[mcollina]

oh forget about that, I made a mistake. What I wanted to replace with something on Ascoltatori was this: https://github.com/mcollina/mosca/blob/master/lib/persistence/redis.js#L126-L132.
However I don't know if it's a good idea. Anyway, it does not belong here (I'm updating this).