// TODO: refactor logging code to use a meshlink_handle_t *.
void logger(meshlink_handle_t *mesh, meshlink_log_level_t level, const char *format, ...) {
// TODO: refactor logging code to use a meshlink_handle_t *.
void logger(meshlink_handle_t *mesh, meshlink_log_level_t level, const char *format, ...) {