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I need an Image topic and a PointCloud2 topic to find pose but it takes so long to get the PointCloud2 message that the process hangs and never triggers the callback. I've used both TimeSynchronizer and ApproximateTImeSynchronizer to no avail.

I was wondering if there's a way where I can use two different functions that keep the last received messages in a global or class variable for the two topics and updates it, and I can work with the two topics in a different function.

I'd really appreciate any help. Thanks.

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