Use QR code from rq_code_string

Hello, I am usinf an UR3 and Robotiq Wrist camera.

I want to read QR codes with two different messages: “Left” and “Right”. It “says” that the the read string will be loaded at “rq_string_code” variable.

But, I can’t find this variable anywhere. I would like to know how I can read the data at the QR and how I can use it in my code.