MX蓝牙模块，目前适配了山星盛衡器蓝牙电子秤和汉印HM-A300打印机，其他型号的请自行研究
用于小程序集成蓝牙小票打印（蓝牙低功耗外围设备小票打印），方便引入其它项目，已经清除多余的代码，简化使用。
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