extern bool send_sptps_data(node_t *to, node_t *from, int type, const void *data, size_t len);
extern bool receive_sptps_record(void *handle, uint8_t type, const void *data, uint16_t len);
extern void send_packet(struct node_t *n, vpn_packet_t *packet);
extern bool send_sptps_data(node_t *to, node_t *from, int type, const void *data, size_t len);
extern bool receive_sptps_record(void *handle, uint8_t type, const void *data, uint16_t len);
extern void send_packet(struct node_t *n, vpn_packet_t *packet);