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Publishers and subscribers must use the same message type.
A std_msgs::Float64 and a double are different c++ types. Your publishing code must create a `std_msgs::Float64 object, set the value, then pass that msg to publish().
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Publishers The publisher declaration and subscribers publish method must use the same message type.
A std_msgs::Float64 and a double are different c++ types. Your publishing code must create a `std_msgs::Float64 object, set the value, then pass that msg to publish().
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