* there is no guarantee that the external address will be valid for an extended period of time.
*
* @param mesh A handle which represents an instance of MeshLink.
- * @param address A nul-terminated C string containing the address, which can be either in numeric format or a hostname.
*
* @return This function returns a pointer to a C string containing the discovered external address,
* or NULL if there was an error looking up the address.