4.3.0（2022.03.18）
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· Added the following method to "AsReaderDevice.h" 
   - (BOOL)isOpened;
· Fixed a data splitting problem when the QR Code scanned is long
· Fixed minor bugs

4.2.1（2022.01.20）
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· Fixes some minor problems.

4.2.0（2022.01.14）
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· Updates objective-C SDK to version 4.2.0.
· Modifies the processing logic within the SDK for connections between devices (once the printer is disconnected, so is the AsReader).
· Fixes some minor problems.