#include <stdint.h>

typedef enum {
    CMD_SET_LEVEL = 1,
    CMD_SET_LIGHTS = 2,
    CMD_SET_DIST = 3,
} command_t;

typedef struct Message {
    uint8_t type;
    union {
        struct { uint8_t level; } set_level;
        struct { uint8_t on; } set_lights;
        struct { float distance; } set_distance;
    } data;
} Message;