These are some tutorials used in Fall 2013 when the class used the NXT brick (the previous LEGO MINDSTORMS before the EV3) on how to do NXT-to-NXT communication (both with Bluetooth and other techniques).

NXT-to-NXT Communication:

https://es93-06.k12engineering.com/2013/10/10/nxt-to-nxt-communication/

Send NXT Motor Commands:

https://es93-06.k12engineering.com/2013/10/17/nxt-to-nxt-send-motor-commands/

Remote Control Example:

https://es93-06.k12engineering.com/2013/10/17/remote-control-two-way-communication/