The story
How Knookee was born
A garden, a not so clean hand and an idea.
Person 1 was working in the garden when something was suddenly needed. There were two options, writing to the family chat or calling someone. But the hands were not exactly clean, so neither was easy.
That is when the idea came. There should be something that lets you tell the others with a single tap, and they surely hear it. Not another chat, not a call, just a signal that makes a sound.
That became Knookee. One knooke, and your people are already opening the door.