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The compiler error that you are getting doesn't seem to refer to a float64/double conversion.

It seems to refer to an invalid use of reset_frequency, we would need more context to help you. Where is ‘gazebo::ParticleShooterPlugin::reset_frequency’ defined? Is it defined as static?

I think the compiler is trying to tell you that you can not assign msg->data to reset_frequency, not because of type incompatibility but because you are actually not allowed to modify the value of reset_frequency.