fork from https://github.com/rusel1989/react-native-bluetooth-serial
请前往看其文档
增加了几个功能便于想打印机输入二进制
writeHexToDevice 输入指令 GMBluetooth.writeHexToDevice('1B 40');
writeTextToDevice 输入文本 GMBluetooth.writeTextToDevice('ReactNative and Bluetooth and Print');
doc 目录是佳博的demo和ESC TSC文档