offline caching of data in ros

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hello everyone,

Im using rosbridge as websocket , i want to store data which gets lost when machine is offline without using rosbag . im using rpi4 kinetic , suppose i have imu data which publishes data frequently, suddenly internet went off for a minute my web will show recent online data when internet restored , i want to store whatever missing data happend in that seconds into local file or buffer it then display

similar as https://aws.amazon.com/blogs/opensour... though im not using aws robomaker , i want to do it in rosbridge or any other websocket way

thanking you