m2m_ping_req

The function sends ping request to the given IP Address.

Functions
sint8	get_alpn_index (SOCKET sock)
sint8	get_error_detail (SOCKET sock, tstrSockErr *pstrErr)
NMI_API sint8	m2m_ping_req (uint32 u32DstIP, uint8 u8TTL, tpfPingCb fpPingCb)
sint8	set_alpn_list (SOCKET sock, const char *pcProtocolList)

sint8 get_alpn_index

(

SOCKET

sock

)

This function gets the index of the protocol negotiated via ALPN. It should be called when a SSL socket connection succeeds, in order to determine which application-layer protocol must be used.

Parameters

[in]

sock

Socket ID obtained by a call to socket. This is the SSL socket to which the ALPN applies.

Returns

The function returns:

• >0: 1-based index of negotiated protocol with respect to the list previously provided to set_alpn_list.
  
• 0: No negotiation occurred (eg TLS peer did not support ALPN).
  
• <0: Invalid parameters (socket is not in use, or not an SSL socket).
  

See Also

Example

References SOCK_ERR_INVALID_ARG, SSL_FLAGS_ACTIVE, TCP_SOCK_MAX, and tstrSocket::u8AlpnStatus.

sint8 get_error_detail	(	SOCKET	sock,
		tstrSockErr *	pstrErr
	)

This function gets detail about a socket failure. The application can call this when notified of a socket failure via SOCKET_MSG_CONNECT or SOCKET_MSG_RECV. If used, it must be called before close.

Parameters

[in]	sock	Socket ID obtained by a call to socket.
[out]	pstrErr	Pointer to structure to be populated with the details of the socket failure.

Returns

The function returns SOCK_ERR_NO_ERROR if the request is successful. In this case pstrErr has been populated. The function returns a negative value if the request is not successful. In this case pstrErr has not been populated.

References tstrSockErr::enuErrSource, NULL, SOCK_ERR_INVALID_ARG, SOCK_ERR_NO_ERROR, TCP_SOCK_MAX, tstrSocket::u8ErrCode, tstrSockErr::u8ErrCode, and tstrSocket::u8ErrSource.

NMI_API sint8 m2m_ping_req	(	uint32	u32DstIP,
		uint8	u8TTL,
		tpfPingCb	fpPingCb
	)

Parameters

[in]	u32DstIP	Target Destination IP Address for the ping request. It must be represented in Network byte order. The function nmi_inet_addr could be used to translate the dotted decimal notation IP to its Network bytes order integer representative.
[in]	u8TTL	IP TTL value for the ping request. If set to ZERO, the default value SHALL be used.
[in]	fpPingCb	Callback will be called to deliver the ping statistics.

Warning

This API should only be used to request one ping at a time; calling this API invalidates callbacks for previous ping requests.

See Also

nmi_inet_addr

Returns

The function returns M2M_SUCCESS for successful operations and a negative value otherwise.

References gfpPingCb, gu32PingId, M2M_ERR_INVALID_ARG, NULL, SOCKET_CMD_PING, SOCKET_REQUEST, tstrPingCmd::u16PingCount, tstrPingCmd::u32CmdPrivate, tstrPingCmd::u32DestIPAddr, and tstrPingCmd::u8TTL.

sint8 set_alpn_list	(	SOCKET	sock,
		const char *	pcProtocolList
	)

This function sets the protocol list used for application-layer protocol negotiation (ALPN). If used, it must be called after creating a SSL socket (using socket) and before connecting/binding (using connect or bind) or securing (using secure).

Parameters

[in]	sock	Socket ID obtained by a call to socket. This is the SSL socket to which the ALPN list applies.
[in]	pcProtocolList	Pointer to the list of protocols available in the application. The entries in the list must: be separated with ' ' (space). not contain ' ' (space) or '\0' (NUL). be non-zero length. The list itself must: be terminated with '\0' (NUL). be no longer than ALPN_LIST_MAX_APP_LENGTH, including separators (spaces) and terminator (NUL). contain at least one entry.

Returns

The function returns M2M_SUCCESS for successful operations and a negative value otherwise.

Example

The example demonstrates an application using set_alpn_list and get_alpn_index to negotiate secure HTTP/2 (with fallback option of HTTP/1.1).

Main Function

*  SOCKET TcpClientSocket = socket(AF_INET, SOCK_STREAM, SOCKET_CONFIG_SSL_ON);
*  if (TcpClientSocket >= 0)
*  {
*      struct sockaddr_in Serv_Addr = {
*          .sin_family = AF_INET,
*          .sin_port = _htons(1234),
*          .sin_addr.s_addr = inet_addr(SERVER)
*      };
*      set_alpn_list(TcpClientSocket, "h2 http/1.1");
*      connect(TcpClientSocket, &Serv_Addr, sizeof(Serv_Addr));
*  }
* 

Socket Callback

*  if(u8Msg == SOCKET_MSG_CONNECT)
*  {
*      tstrSocketConnectMsg    *pstrConnect = (tstrSocketConnectMsg*)pvMsg;
*      if(pstrConnect->s8Error == 0)
*      {
*          uint8   alpn_index = get_alpn_index(pstrConnect->sock);
*          switch (alpn_index)
*          {
*              case 1:
*                  printf("Negotiated HTTP/2\n");
*              break;
*              case 2:
*                  printf("Negotiated HTTP/1.1\n");
*              break;
*              case 0:
*                  printf("Protocol negotiation did not occur\n");
*              break;
*          }
*      }
*  }
* 

References ALPN_LIST_MAX_APP_LENGTH, ALPN_LIST_MAX_SIZE, m2m_memcpy(), m2m_strlen(), NULL, setsockopt(), SO_SSL_ALPN, SOCK_ERR_INVALID_ARG, SOL_SSL_SOCKET, and TCP_SOCK_MAX.