Connect TX of one to RX of the other, and vice versa. Then write code to send and receive data as necessary. Without knowing more about what you want to do, it's not possible to be more specific in an answer.
Connect TX of one to RX of the other, and vice versa. Then write code to send and receive data as necessary. Without knowing more about what you want to do, it's not possible to be more specific in an answer.