BugID:22154625: Resolve vnprintf not sync with printf under esp8266.
@@ -179,6 +179,7 @@ int ulog(const unsigned char s, const char *mod, const char *f, const unsigned l
va_start(args, fmt);
rc = vprintf(fmt, args);
va_end(args);
+ fflush(stdout);
printf("\r\n");
#endif /* if def ULOG_CONFIG_ASYNC */
log_release_mutex();
