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init: Air780EPM 官方 LuatOS 项目代码基线

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- 来源: 合宙 LuatOS 官方仓库 air780epm 模块完整代码
- 路径: luatos/air780epm/module/Air780EPM/demo 含官方 demo(含 mqtt/mqtts/socket/uart 等)
- 后续: 基于 demo 开发 UART<->MQTT 数据上报功能
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## 演示功能概述
使用Air780EPM开发板，本示例主要是展示xxtea核心库的使用，使用xxtea加密算法，对数据进行加密和解密
## 演示硬件环境
1、Air780EPM开发板一块
2、TYPE-C USB数据线一根
3、Air780EPM开发板和数据线的硬件接线方式为
- Air780EPM开发板通过TYPE-C USB口供电；
- TYPE-C USB数据线直接插到核心板的TYPE-C USB座子，另外一端连接电脑USB口；
## 演示软件环境
1、Luatools下载调试工具
2、[Air780EPM V2014版本固件](https://docs.openluat.com/air780epm/luatos/firmware/version/)
## 演示核心步骤
1、搭建好硬件环境
2、通过Luatools将demo与固件烧录到整机开发板中
3、烧录好后，板子开机将会在Luatools上看到如下打印：
xxtea_encrypt为加密后的字符串，xxtea_decrypt为解密后的字符串，通过16进制展示
```lua
[2025-09-25 12:01:10.767][000000001.449] I/user.testCrypto.xxteaTest xxtea_encrypt: 4088CEEE2EDF81BE3DCDC5FAB6D20925 32
[2025-09-25 12:01:10.777][000000001.449] I/user.testCrypto.xxteaTest decrypt_data: 48656C6C6F20576F726C6421 24
[2025-09-25 12:01:11.055][000000002.450] I/user.testCrypto.xxteaTest xxtea_encrypt: 4088CEEE2EDF81BE3DCDC5FAB6D20925 32
[2025-09-25 12:01:11.064][000000002.450] I/user.testCrypto.xxteaTest decrypt_data: 48656C6C6F20576F726C6421 24
[2025-09-25 12:01:12.053][000000003.451] I/user.testCrypto.xxteaTest xxtea_encrypt: 4088CEEE2EDF81BE3DCDC5FAB6D20925 32
[2025-09-25 12:01:12.061][000000003.451] I/user.testCrypto.xxteaTest decrypt_data: 48656C6C6F20576F726C6421 24
[2025-09-25 12:01:13.105][000000004.478] I/user.testCrypto.xxteaTest xxtea_encrypt: 4088CEEE2EDF81BE3DCDC5FAB6D20925 32
[2025-09-25 12:01:13.113][000000004.479] I/user.testCrypto.xxteaTest decrypt_data: 48656C6C6F20576F726C6421 24
[2025-09-25 12:01:14.080][000000005.480] I/user.testCrypto.xxteaTest xxtea_encrypt: 4088CEEE2EDF81BE3DCDC5FAB6D20925 32
[2025-09-25 12:01:14.089][000000005.480] I/user.testCrypto.xxteaTest decrypt_data: 48656C6C6F20576F726C6421 24
[2025-09-25 12:01:15.079][000000006.481] I/user.testCrypto.xxteaTest xxtea_encrypt: 4088CEEE2EDF81BE3DCDC5FAB6D20925 32
[2025-09-25 12:01:15.090][000000006.481] I/user.testCrypto.xxteaTest decrypt_data: 48656C6C6F20576F726C6421 24
[2025-09-25 12:01:16.089][000000007.482] I/user.testCrypto.xxteaTest xxtea_encrypt: 4088CEEE2EDF81BE3DCDC5FAB6D20925 32
[2025-09-25 12:01:16.098][000000007.482] I/user.testCrypto.xxteaTest decrypt_data: 48656C6C6F20576F726C6421 24
[2025-09-25 12:01:17.091][000000008.483] I/user.testCrypto.xxteaTest xxtea_encrypt: 4088CEEE2EDF81BE3DCDC5FAB6D20925 32
[2025-09-25 12:01:17.100][000000008.483] I/user.testCrypto.xxteaTest decrypt_data: 48656C6C6F20576F726C6421 24
```