How to set up a command-based communication using I2C

[DrDiettrich]

@Koepel

• while while(0 < Wire.available()) Why would you use a while-statement ? How many times do you want to read the package of data ?
• 0 < Wire.available() Who on earth uses that ? If I say it out loud: "while zero is lower than the amount of available data". Huh ?

That's how the Wire library examples receive I2C input. Please direct improvements to the library maintainers. Apart from that I cannot see any error in that code - so far.