printerEvents method
监听打印机版本和打印状态事件。
Implementation
Stream<Nf5503PrintEvent> printerEvents() {
throw UnimplementedError('printerEvents() has not been implemented.');
}
printerEvents method
监听打印机版本和打印状态事件。
Stream<Nf5503PrintEvent> printerEvents() {
throw UnimplementedError('printerEvents() has not been implemented.');
}