Printer constructor Null safety

1. printersdk
2. printersdk
3. Printer
4. Printer constructor

Printer class

1. Constructors
2. Printer
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. connectPrinter
8. disconnectAllPrinter
9. disconnectPrinter
10. getConnectedPrinters
11. getPrinterMode
12. getPrinterModel
13. getPrinterStatus
14. isConnected
15. listenPrinterConnectState
16. noSuchMethod
17. read
18. scanBluetoothDevice
19. scanTcpDevice
20. scanTtyDevice
21. scanUsbAccessory
22. scanUsbDevice
23. setLocatetionEnableStringForBluetoothScan
24. stopScanBlueToothDevice
25. toString
26. write
27. writeAndRead
28. Operators
29. operator ==
30. Static properties
31. instance