python can - general question

[caslor]

Hi to all.
recently i start to experiment with a python-can (can bus) as i want in the future to make a communication between a raspberry pi with can bus and some Arduino with can bus also.

i have one question with remote frame and why to use it instead of just a simple message

i cant find any difference if i send a very small Message with a specific id so the Arduino with the code to read the specific id message transmit the message i want to receive
and if i send a remote frame message. still i need to add code to my Arduino if reads the specific id incoming message to send the message i want


what have i misunderstand ?

thanks in advance