rqt_bag_exporter/ExportToCSV Action

# Topic to be exported
string topic_name

# Export directory
string directory

# Start export time
float64 start_time

# End export time
float64 end_time
---
# Success if empty, contains error string otherwise
string error
---
# Percentage of progress (0.0 to 100.0)
uint64 progress_value

# Progress message
string progress_msg