Function flush

src/fl/stl/cstdio.cpp.hpp:208–215

}

bool flush(u32 timeoutMs) {
#ifdef FASTLED_TESTING
    if (get_flush_handler()) {
        return get_flush_handler()(timeoutMs);
    }
#endif
    return platforms::flush(timeoutMs);
}

size_t write_bytes(const u8* buffer, size_t size) {
    if (!buffer || size == 0) return 0;