Let's say I'm running a Blackberry / Android UA rich client that received new message notifications (what's that Skippy? No native Symbian push API for Symbian?), by which I mean simple "there are new messages" ping that causes the unread message counts to refresh using a folder list. Now my inclusive data tariff isn't all that so I probably have different requirements compared to being sat at home using qUAck over WiFi / broadband. I might only be interested in knowing when new messages turn up in Private, London-Chat and Quiz for example but not the other 50 folders that I read when I've got time. So the gateway picks up all the new message notifications and issues a push to you if the message is in a folder that's part of your roaming profile. Now granted nothing in the UA server supports the concept subscription filtering but you could achieve the same thing by storing the information as client data which UA does support.
First you need a JSON configuration file:
{ "ua_host":"some.host.org", "ua_port":2334,
"url_base":"localhost:3000", "port":3000,
"frequency":{"7200":"Two hours","180":"Three minutes"}
}
Pass that as the only argument to the server.
> node server.js config.js