network_interface.h File Reference

Network interface definition for MQTT client.

Defines an interface to the TLS layer to be used by the MQTT client. Starting point for porting the SDK to the networking layer of a new platform.

Data Structures
struct	Network
	Network Structure. More...
struct	TLSConnectParams
	TLS Connection Parameters. More...

Typedefs
typedef struct Network	Network
	Network Type. More...

Functions
int	iot_tls_connect (Network *pNetwork, TLSConnectParams TLSParams)
	Create a TLS socket and open the connection. More...
int	iot_tls_destroy (Network *pNetwork)
	Perform any tear-down or cleanup of TLS layer. More...
void	iot_tls_disconnect (Network *pNetwork)
	Disconnect from network socket. More...
int	iot_tls_init (Network *pNetwork)
	Initialize the TLS implementation. More...
int	iot_tls_is_connected (Network *pNetwork)
	Check if TLS layer is still connected. More...
int	iot_tls_read (Network *, unsigned char *, int, int)
	Read bytes from the network socket. More...
int	iot_tls_write (Network *, unsigned char *, int, int)
	Write bytes to the network socket. More...

typedef struct Network Network

Network Type.

Defines a type for the network struct. See structure definition below.

int iot_tls_connect	(	Network *	pNetwork,
		TLSConnectParams	params
	)

Create a TLS socket and open the connection.

Creates an open socket connection including TLS handshake.

Parameters

pNetwork	- Pointer to a Network struct defining the network interface.
TLSParams	- TLSConnectParams defines the properties of the TLS connection.

Returns

integer - successful connection or TLS error

Create a TLS socket and open the connection.

Parameters

[in]	pNetwork	Network interface.
[in]	params	connection parameters for TLS.

Returns

Status.

References _htons, AF_INET, close(), connect(), TLSConnectParams::DestinationPort, DNS_REQUEST, err, gethostbyname(), gu32HostIp, Network::my_socket, NONE_ERROR, TLSConnectParams::pDestinationURL, printf, ret, in_addr::s_addr, set_alpn_list(), sockaddr_in::sin_addr, sockaddr_in::sin_family, sockaddr_in::sin_port, SOCK_STREAM, socket(), SOCKET_FLAGS_SSL, SOCKET_MSG_CONNECT, SSL_CONNECT_ERROR, TCP_CONNECT_ERROR, and wait_for_event().

Referenced by iot_tls_init().

int iot_tls_destroy

(

Network *

pNetwork

)

Perform any tear-down or cleanup of TLS layer.

Called to cleanup any resources required for the TLS layer.

Parameters

Network

- Pointer to a Network struct defining the network interface.

Returns

integer - successful cleanup or TLS error

Perform any tear-down or cleanup of TLS layer.

Parameters

[in]

pNetwork

Network interface.

Returns

Status.

References Network::disconnect, Network::mqttread, Network::mqttwrite, Network::my_socket, NONE_ERROR, NULL, and NULL_VALUE_ERROR.

Referenced by iot_tls_init().

void iot_tls_disconnect

(

Network *

pNetwork

)

Disconnect from network socket.

Parameters

Network

- Pointer to a Network struct defining the network interface.

Disconnect from network socket.

Parameters

[in]

pNetwork

Network interface.

Returns

None.

References close(), Network::my_socket, and NULL.

Referenced by iot_tls_init().

int iot_tls_init

(

Network *

pNetwork

)

Initialize the TLS implementation.

Perform any initialization required by the TLS layer. Connects the interface to implementation by setting up the network layer function pointers to platform implementations.

Parameters

pNetwork

- Pointer to a Network struct defining the network interface.

Returns

integer defining successful initialization or TLS error

Initialize the TLS implementation.

Parameters

[in]

pNetwork

Network interface.

Returns

Error status.

References Network::connect, Network::destroy, Network::disconnect, iot_tls_connect(), iot_tls_destroy(), iot_tls_disconnect(), iot_tls_is_connected(), iot_tls_read(), iot_tls_write(), Network::isConnected, Network::mqttread, Network::mqttwrite, Network::my_socket, NONE_ERROR, NULL, NULL_VALUE_ERROR, registerSocketCallback(), resolve_cb(), socket_cb(), and socketInit().

Referenced by aws_iot_mqtt_connect().

int iot_tls_is_connected

(

Network *

pNetwork

)

Check if TLS layer is still connected.

Called to check if the TLS layer is still connected or not.

Parameters

Network

- Pointer to a Network struct defining the network interface.

Returns

int - integer indicating status of network physical layer connection

Check if TLS layer is still connected.

Parameters

[in]

pNetwork

Network interface.

Returns

Status.

Referenced by iot_tls_init().

int iot_tls_read	(	Network *	,
		unsigned char *	,
		int	,
		int
	)

Read bytes from the network socket.

Parameters

Network	- Pointer to a Network struct defining the network interface.
unsigned	char pointer - pointer to buffer where read bytes should be copied
integer	- number of bytes to read
integer	- read timeout value in milliseconds

Returns

integer - number of bytes read or TLS error

References buf_ptr, err, gau8SocketTestBuffer, i, len, Network::my_socket, NULL, NULL_VALUE_ERROR, printf, received_bytes, recv(), ret, SOCKET_MSG_RECV, SSL_READ_ERROR, and wait_for_event().

Referenced by iot_tls_init().

int iot_tls_write	(	Network *	pNetwork,
		unsigned char *	pMsg,
		int	len,
		int	timeout_ms
	)

Write bytes to the network socket.

Parameters

Network	- Pointer to a Network struct defining the network interface.
unsigned	char pointer - buffer to write to socket
integer	- number of bytes to write
integer	- write timeout value in milliseconds

Returns

integer - number of bytes written or TLS error

Write bytes to the network socket.

Parameters

[in]	pNetwork	Network interface.
[in]	pMsg	data to write
[in]	len	length of data.
[in]	timeout_ms	timeout for write function.

Returns

Status.

References err, i, len, Network::my_socket, NULL, NULL_VALUE_ERROR, printf, ret, send(), sent_bytes, SOCKET_MSG_SEND, SSL_WRITE_ERROR, and wait_for_event().

Referenced by iot_tls_init().