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Shouldn't it be rather print("list: ", msg.data) in your callback? Check ROS documentation there for correct form of ROS1 subscriber. The array poses can be acquired through the field of msg.data.

Shouldn't it be rather print("list: ", msg.data) in your callback? Check ROS documentation there for correct form of ROS1 subscriber. The array poses can be acquired through as the field of msg.data.