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The correct format for message-type in a .msg file is

package_name/data_type_name[] variable name

Where data_type_name is a message in the package package_name

eg.

std_msgs/Float64[] values

Note that this is not a regular array in c++.

After generating the msg file, if you look at the .h file for that message, you will find that values is a vector of doubles.

std::vector <double> values;

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