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You have a few options, depending on the details of your situation. Capture on the iOS device is out of the question, it's not made possible. So you're down to either capture on the Wifi link between App and WiFi router, or in the WiFi router itself. WiFI capture can be tricky, so if your WiFi router supports capture that would help. OTOH, it is to be expected that the communication between the App and the Server is encrypted, so even if you can capture it there's no guaranteed you can make us of it without the encryption keys.
