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ros::Subscriber sens_sub_ = n.subscribe<turtlebot_node::turtlebotsensorstate>("sensor_state", 1000, callback01);

this line should have /turtlebot_node/sensor_state

like this

ros::Subscriber sens_sub_ = n.subscribe<turtlebot_node::turtlebotsensorstate>("/turtlebot_node/sensor_state", 1000, callback01);

and as long as your main program can see bumperState

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