<p><b>@jia200x</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/10799#discussion_r258499787">sys/include/registry/registry.h</a>:</p>
<pre style='color:#555'>> + * parameter is string.
+ * @return 0 on success, non-zero on failure
+ */
+int registry_value_from_str(char *val_str, registry_type_t type, void *vp,
+                            int maxlen);
+
+/**
+ * @brief Convenience function to parse a configuration parameter value of
+ * `bytes` type from a string.
+ *
+ * @param[in] val_str Pointer of the string containing the value
+ * @param[out] vp Pointer to store the parsed value
+ * @param len Length of the output buffer
+ * @return 0 on success, non-zero on failure
+ */
+int registry_bytes_from_str(char *val_str, void *vp, int *len);
</pre>
<p>here <code>len</code> is a in/out argument. The documentation is missing here</p>

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