demo

README

This is a demo "pack" to illustrate basic use of the "hub":

• make sure the hub is running properly: jet start
• open a new shell to show all messages: cd jet/pack/dump && node dump.js
• in this demo dir you can now launch the demo: make

This will start two instances of the demo pack, which connect to the hub and send a message to the "hub/hello" topic. Then, a second later, the demo pack will quit and disconnect from the hub. As a result, the hub will send another message to the "hub/goodbye" topic (using the "last will" mechanism).

Here is a transcript of the message dump output:

hub/hello [1,"demo",1423039751,10347,"jaycee.local"]
/test/haha [123,null,"abc"]
hub/hello [1,"demo",1423039752,10353,"jaycee.local"]
hub/goodbye [1,"demo",1423039751,10347,"jaycee.local"]
/test/haha [123,null,"abc"]
hub/goodbye [1,"demo",1423039752,10353,"jaycee.local"]

The hub/{hello,goodbye} messages contain: [version, pack-name, time, pid, now].

The hub system log itself can be tracked with: cd jet/run && tail -f hub.log.

Documentation

Overview

This package is a small demo "pack" which connects to JET/Hub.