CardReaderManager  
    Functions
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                  Connects to a USB card reader.
Connects to a card reader.
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                  Disconnects from the current connected device.
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                  Returns information about updates available for the current connected device.
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                  List of previously connected devices.
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                  Starts the discovery of compatible BTLE devices. Returns an error in case the discovery was not possible or scanning failed
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                  Starts an update of the current connected reader's software
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                  Stops the discovery of compatible BTLE devices.