Add timezone config item

components/config/config.h

@@ -44,7 +44,7 @@ size_t config_get_hostname(char *buffer, size_t buffer_size);
 /**
  * Add a callback for hostname updates.
  *
- * The function specified in the argument will be invoked whenever a
+ * The function specified in the argument will be invoked whenever
  * the hostname is updated, with the new value as its argument. The
  * lifetime of the passed argument will be static, but the value may
  * be modified once the callback returns.
@@ -72,8 +72,8 @@ size_t config_get_ssid(char *buffer, size_t buffer_size);
 /**
  * Add a callback for SSID updates.
  *
- * The function specified in the argument will be invoked whenever a
- * the ssid is updated, with the new value as its argument. The
+ * The function specified in the argument will be invoked whenever
+ * the SSID is updated, with the new value as its argument. The
  * lifetime of the passed argument will be static, but the value may
  * be modified once the callback returns.
  */
@@ -100,11 +100,40 @@ size_t config_get_psk(char *buffer, size_t buffer_size);
 /**
  * Add a callback for PSK updates.
  *
- * The function specified in the argument will be invoked whenever a
- * the psk is updated, with the new value as its argument. The
- * lifetime of the passed argument will be static, but the value may
- * be modified once the callback returns.
+ * The function specified in the argument will be invoked whenever the
+ * PSK is updated, with the new value as its argument. The lifetime of
+ * the passed argument will be static, but the value may be modified
+ * once the callback returns.
  */
 void config_add_psk_callback(ConfigCallback callback);
 
+/**
+ * Set the timezone.
+ *
+ * The argument should be a null-terminated string, containing a
+ * timezone spec in the format expected by tzset(). If the maximum
+ * length is exceeded, the value will still be used, but will be
+ * truncated.
+ */
+void config_set_timezone(const char *psk);
+
+/**
+ * Write the timezone into the given buffer.
+ *
+ * The length of the timezone is returned. If the value's size exceeds
+ * the size of the buffer, nothing will be written to the buffer but
+ * the length is still returned.
+ */
+size_t config_get_timezone(char *buffer, size_t buffer_size);
+
+/**
+ * Add a callback for timezone updates.
+ *
+ * The function specified in the argument will be invoked whenever the
+ * timezone is updated, with the new value as its argument. The
+ * lifetime of the passed argument will be static, but the value may
+ * be modified once the callback returns.
+ */
+void config_add_timezone_callback(ConfigCallback callback);
+
 #endif