np_client_free np_client_new np_client_start_service np_client_t NP_DISK_USAGE_CHANGED np_error_t np_notify_cb_t np_observe_notification np_observe_notifications np_post_notification np_set_notify_callback

np_observe_notifications() np_error_t np_observe_notifications ( np_client_t  client, const char **  notification_spec  ) Tells the device to send a notification on specified events. Parameters client The client to send to notification_spec Specification of the notifications that should be observed. This is expected to be an array of const char* that MUST have a terminating NULL entry. Returns NP_E_SUCCESS on success, NP_E_INVALID_ARG when client is null, or an error returned by np_observe_notification.