About ten years ago, I was a development team leader of experimental system in outdoor field.

At that time,

"I never touch "wireless communication" in any outdoor experiment.

has been my motto.

- communications were going down in some quarters,

- some unknown system failures happened,

- broken characters were inserted in communication messages

Anyway I could not fix the reason of system failures of "wireless"

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I know that "wireless" is useful.

It's clear if you look at your smartphone.

However, this is a result that carries(telephone companies) have invested some resources about

- more than ten years,

- tens of thousands of engineers,

- some trillion yen of money,

The input cost is different from a cost of several weeks and only a few engineers.

-----

"I never touch "wireless communication" in any outdoor experiment.

Why have I forgotten such an important thing that should have been one of the three lessons of my life?

Now, I'm standing stunning with pale in front of the large display that shows kernel panic messages (I don't understand the content).

(By the way, the security system of the Ebatas is based on the idea of "never believing in radio absolutely")