init: Air780EPM 官方 LuatOS 项目代码基线

- 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

luatos/air780epm/lua/include/rotable.h

@@ -0,0 +1,25 @@
+#ifndef ROTABLE_H_
+#define ROTABLE_H_
+
+#include "lua.h"
+
+/* exactly the same as luaL_Reg, but since we are on small embedded
+ * microcontrollers, we don't assume that you have `lauxlib.h`
+ * available in your build! */
+typedef struct rotable_Reg {
+  char const* name;
+  lua_CFunction func;
+  lua_Integer value;
+} rotable_Reg;
+
+/* compatible with `luaL_newlib()`, and works with `luaL_Reg` *and*
+ * `rotable_Reg` arrays (in case you don't use `lauxlib.h`) */
+void rotable_newlib( lua_State* L, void const* reg );
+
+/* Since userdatas can not be used as `__index` meta methods directly
+ * this function creates a C closure that looks up keys in a given
+ * `rotable_Reg` array. */
+void rotable_newidx( lua_State* L, void const* reg );
+
+#endif /* ROTABLE_H_ */
+