- * @param sub_system sub system string
- * @param peer Peer identity (can be NULL)
- * @param key record key string (can be NULL)
- * @param value record value BLOB (can be NULL)
- * @param value_size record value size in bytes (set to 0 if value is NULL)
- * @param expiry absolute time after which the record expires
- * @param msg_type message type to be set in header
- * @return pointer to record message struct