serval-dna/msp_client.h

#ifndef __SERVALD_MSP_CLIENT_H
#define __SERVALD_MSP_CLIENT_H

#define MSP_STATE_UNINITIALISED 0
#define MSP_STATE_LISTENING (1<<0)

#define MSP_STATE_CONNECTING (1<<1)
#define MSP_STATE_CONNECTED (1<<2)

#define MSP_STATE_SHUTDOWN_LOCAL (1<<3)
#define MSP_STATE_SHUTDOWN_REMOTE (1<<4)

// this connection is about to be free'd, release any other resources or references to the state
#define MSP_STATE_CLOSED (1<<5)

// something has gone wrong somewhere and the connection will be closed
#define MSP_STATE_ERROR (1<<6)

// does the client want to be interupted to reading data?
#define MSP_STATE_POLLIN (1<<7)
// does the client want to know when data can be written?
#define MSP_STATE_POLLOUT (1<<8)

// is there some data to read?
#define MSP_STATE_DATAIN (1<<9)
// is there space for sending more data?
#define MSP_STATE_DATAOUT (1<<10)


struct msp_sock;
typedef uint16_t msp_state_t;

// allocate a new socket
struct msp_sock * msp_socket(int mdp_sock);
void msp_close(struct msp_sock *sock);

int msp_set_handler(struct msp_sock *sock, 
  int (*handler)(struct msp_sock *sock, msp_state_t state, const uint8_t *payload, size_t len, void *context), 
  void *context);

// the local address is only set when calling msp_listen or msp_send
int msp_set_local(struct msp_sock *sock, struct mdp_sockaddr local);
int msp_set_remote(struct msp_sock *sock, struct mdp_sockaddr remote);

int msp_listen(struct msp_sock *sock);

int msp_get_remote_adr(struct msp_sock *sock, struct mdp_sockaddr *remote);
msp_state_t msp_get_state(struct msp_sock *sock);

// which events are you interested in handling?
void msp_set_watch(struct msp_sock *sock, msp_state_t flags);

// bind, send data, and potentially shutdown this end of the connection
int msp_send(struct msp_sock *sock, const uint8_t *payload, size_t len);
int msp_shutdown(struct msp_sock *sock);

// receive and process an incoming packet
int msp_recv(int mdp_sock);

// next_action indicates the next time that msp_processing should be called
int msp_processing(time_ms_t *next_action);

#endif