What I have is is a complex app that talks to up to 200+ sensors and displays the data, logs it. It also provides a simple serial terminal and an on-line help system. I am adding the ability to trigger notifications based on filtering the sensor readings. I wrote it like all the examples I saw, and despite my best efforts, it's big, ugly, and unweildy.
For the filter creation I'm going to have to build a rule editor that allows you to specify N clauses ( <FEILD> < IS / IS LESS THAN / IS GREATER THAN > <VALUE> ) and specify whether they are combined as a conjuction (ALL) or disjunction (ANY). I think I will be making a Clause mega-widget. I think I'll use an HList to manage my clause widgets, as it provides the add_row() functionality you describe. HList is pretty cool, if you haven't used it, check it out.
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