bidirectional link

Hello, I'm coming to you for help with my BAC project. I must be able to establish a dialogue between two computers via two arduino boards connected with two Serial grove Rf pro module, I can not find or write the right program and I would like to know if any of you could steer on the program in order to send and receive messages on both engine series.
Thank you in advance!!

Links to the hardware?
Schematic?
What have you tried?

If you loaded the library to go with those Grove modules, there should be Working Examples in your IDE.