Common functions

Macros
#define	netconn_new(t)   netconn_new_with_proto_and_callback(t, 0, NULL)
#define	netconn_peer(c, i, p)   netconn_getaddr(c,i,p,0)
#define	netconn_addr(c, i, p)   netconn_getaddr(c,i,p,1)
#define	netconn_set_ipv6only(conn, val)
#define	netconn_get_ipv6only(conn)   (((conn)->flags & NETCONN_FLAG_IPV6_V6ONLY) != 0)

Enumerations
enum	netconn_type { ,   NETCONN_TCP = 0x10, NETCONN_TCP_IPV6 = NETCONN_TCP | 0x08, NETCONN_UDP = 0x20, NETCONN_UDPLITE = 0x21,   NETCONN_UDPNOCHKSUM = 0x22, NETCONN_UDP_IPV6 = NETCONN_UDP | 0x08, NETCONN_UDPLITE_IPV6 = NETCONN_UDPLITE | 0x08, NETCONN_UDPNOCHKSUM_IPV6 = NETCONN_UDPNOCHKSUM | 0x08,   NETCONN_RAW = 0x40 }

Functions
err_t	netconn_delete (struct netconn *conn)
err_t	netconn_bind (struct netconn *conn, const ip_addr_t *addr, u16_t port)
err_t	netconn_connect (struct netconn *conn, const ip_addr_t *addr, u16_t port)
err_t	netconn_recv (struct netconn *conn, struct netbuf **new_buf)
err_t	netconn_gethostbyname_addrtype (const char *name, ip_addr_t *addr, u8_t dns_addrtype)

Detailed Description

For use with TCP and UDP

Macro Definition Documentation

netconn_addr

#define netconn_addr	(		c,
			i,
			p
	)		netconn_getaddr(c,i,p,1)

netconn_get_ipv6only

#define netconn_get_ipv6only

(

conn

)

(((conn)->flags & NETCONN_FLAG_IPV6_V6ONLY) != 0)

TCP: Get the IPv6 ONLY status of netconn calls (see NETCONN_FLAG_IPV6_V6ONLY)

netconn_new

#define netconn_new

(

t

)

netconn_new_with_proto_and_callback(t, 0, NULL)

Create new netconn connection

Parameters

t	netconn_type

netconn_peer

#define netconn_peer	(		c,
			i,
			p
	)		netconn_getaddr(c,i,p,0)

netconn_set_ipv6only

#define netconn_set_ipv6only	(		conn,
			val
	)

Value:

do { if(val) { \
  (conn)->flags |= NETCONN_FLAG_IPV6_V6ONLY; \
} else { \
  (conn)->flags &= ~ NETCONN_FLAG_IPV6_V6ONLY; }} while(0)

TCP: Set the IPv6 ONLY status of netconn calls (see NETCONN_FLAG_IPV6_V6ONLY)

Enumeration Type Documentation

netconn_type

enum netconn_type

Protocol family and type of the netconn

Enumerator
NETCONN_TCP	TCP IPv4
NETCONN_TCP_IPV6	TCP IPv6
NETCONN_UDP	UDP IPv4
NETCONN_UDPLITE	UDP IPv4 lite
NETCONN_UDPNOCHKSUM	UDP IPv4 no checksum
NETCONN_UDP_IPV6	UDP IPv6 (dual-stack by default, unless you call netconn_set_ipv6only)
NETCONN_UDPLITE_IPV6	UDP IPv6 lite (dual-stack by default, unless you call netconn_set_ipv6only)
NETCONN_UDPNOCHKSUM_IPV6	UDP IPv6 no checksum (dual-stack by default, unless you call netconn_set_ipv6only)
NETCONN_RAW	Raw connection IPv4

Function Documentation

netconn_bind()

err_t netconn_bind	(	struct netconn *	conn,
		const ip_addr_t *	addr,
		u16_t	port
	)

Bind a netconn to a specific local IP address and port. Binding one netconn twice might not always be checked correctly!

Parameters

conn	the netconn to bind
addr	the local IP address to bind the netconn to (use IP4_ADDR_ANY/IP6_ADDR_ANY to bind to all addresses)
port	the local port to bind the netconn to (not used for RAW)

Returns

ERR_OK if bound, any other err_t on failure

netconn_connect()

err_t netconn_connect	(	struct netconn *	conn,
		const ip_addr_t *	addr,
		u16_t	port
	)

Connect a netconn to a specific remote IP address and port.

Parameters

conn	the netconn to connect
addr	the remote IP address to connect to
port	the remote port to connect to (no used for RAW)

Returns

ERR_OK if connected, return value of tcp_/udp_/raw_connect otherwise

netconn_delete()

err_t netconn_delete

(

struct netconn *

conn

)

Close a netconn 'connection' and free its resources. UDP and RAW connection are completely closed, TCP pcbs might still be in a waitstate after this returns.

Parameters

conn	the netconn to delete

Returns

ERR_OK if the connection was deleted

netconn_gethostbyname_addrtype()

err_t netconn_gethostbyname_addrtype	(	const char *	name,
		ip_addr_t *	addr,
		u8_t	dns_addrtype
	)

Execute a DNS query, only one IP address is returned

Parameters

name	a string representation of the DNS host name to query
addr	a preallocated ip_addr_t where to store the resolved IP address
dns_addrtype	IP address type (IPv4 / IPv6)

Returns

ERR_OK: resolving succeeded ERR_MEM: memory error, try again later ERR_ARG: dns client not initialized or invalid hostname ERR_VAL: dns server response was invalid

netconn_recv()

err_t netconn_recv	(	struct netconn *	conn,
		struct netbuf **	new_buf
	)

Receive data (in form of a netbuf containing a packet buffer) from a netconn

Parameters

conn	the netconn from which to receive data
new_buf	pointer where a new netbuf is stored when received data

Returns

ERR_OK if data has been received, an error code otherwise (timeout, memory error or another error)