Chapter 9

It nudges you once

When a card changes state, your phone can say so - once, in one line, with the value.

This part waits for the app. The server side is built; the app that receives the pushes is not in the stores yet.

A push goes out when a card changes state, never for every reading: the card's name and one line with the value, such as "went critical: 4".

Per card you choose how much: critical only (the default), low and critical, or everything, which adds stale, error, data back and target reached. Or nothing at all.

After a push the card is quiet for a while - 30 minutes by default, set per card. Going critical always goes through, quiet or not. An alarm held back by the quiet period is sent when it ends, if it is still the card's latest state.

"Back to normal" is sent only if the alarm before it actually went out. You are never told that something recovered when you never heard it was wrong, and never told the same state twice.

That is the card's whole life: a number, its normal, a colour only when it moved, your lines and your target, a history of what changed, the reason you gave it, and one nudge when it mattered.