I2C Frame

[Init]

How does it look with I2C-Frame for transmit and receive. Is there any standard or can I choose it free?

[ESPsupport]

It uses standard I2C as per the datasheet, I don't understand your question

[Init]

i mean the structure of the frame. for example first i must send a start bit then wait for ack than i can send data an at the end i send the stop bit. is the structure predefined or can i choose it free?
how long can be the data bytes?

[ESPsupport]

Yes, maybe if you look at some samples.

A recent app note is P2012 http://www.4dsystems.com.au/appnotes/

There's some older stuff here http://old.4dsystems.com.au/code/index.php?node=79