IGPAPI
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    Variable ReelsViewerPressSignalsSchemaConst

    ReelsViewerPressSignalsSchema: Struct<
        { clientIpv4: String; ipv4ReceivedTimestamp: Number },
    > = ...

    The address the app received from the server and re-sends as press_signals on the viewer's tail page ({"client_ipv4","ipv4_received_timestamp"}). The library keeps no captured address, so a caller that holds the session's fact declares it; without one the field is not sent rather than invented.