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how does second term of advertise

Hello. I'm writing a program that reads data from a laser. This information is published by stage or a bag file. I know that the second parameter of the function advertise() or subscribe() is the size of the message queue, but how does this value? for example, I have assigned 50 but in other examples value turns to 10 , How does this changes affect the program?

Thanks in advance, azucena

how does second term of advertise

Hello. I'm writing a program that reads data from a laser. This information is published by stage or a bag file. I know that the second parameter of the function advertise() or subscribe() is the size of the message queue, but how does this value? for example, I have assigned 50 but in other examples value turns to 10 , How does this changes affect the program?

Thanks in advance, azucena