In this chapter, we have discussed the development of web UIs for Linux-based appliances, in particular, the web UI for Laddie. It has not been our goal to discuss all of web technology—you will find entire books on that subject.
This chapter highlighted the pertinent features of Laddie's web UI:
The alarm status page updates automatically whenever there is a change in the alarm state on the appliance:
When an alarm is triggered, each browser viewing the status web page is refreshed automatically.
When any browser is used to clear an alarm, the change is reflected on all other browsers. ...