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| FNET_ERR_OK | There is no error.
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| FNET_ERR_NO_DESC | No more socket descriptors are available.
An application has opened too many sockets. The maximum number of available socket descriptors is defined by the FNET_CFG_SOCKET_MAX.
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| FNET_ERR_NOMEM | Cannot allocate the memory.
The error is indicating a lack of required memory resources.
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| FNET_ERR_AGAIN | Try again, a retry at some time later may be successful.
This error is returned from operations on sockets that cannot be completed immediately. It is a non-fatal error and the operation should be retried later.
For example, it is normal for the FNET_ERR_AGAIN to be reported as the result from the fnet_socket_accept() calling on a SOCK_STREAM socket, since some time must elapse for the connection to be established.
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| FNET_ERR_BOUNDREQ | The socket has not been bound with fnet_socket_bind().
A socket must be bound to an address before calling fnet_socket_getname(), fnet_socket_recvfrom(), fnet_socket_recv(), and fnet_socket_listen().
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| FNET_ERR_INVAL | Invalid argument.
An invalid argument was supplied.
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| FNET_ERR_DESTADDRREQ | Destination address required.
A required address was omitted from an operation on a socket. For example, this error will be returned, if the fnet_socket_sendto() or fnet_socket_connect() is called with the remote address of INADDR_ANY.
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| FNET_ERR_MSGSIZE | Message too long.
A message sent on a datagram socket was larger than the internal message buffer, or some other network limit, or the buffer, which is used to receive a datagram was smaller than the datagram itself.
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| FNET_ERR_NOPROTOOPT | Bad protocol option.
An unknown, invalid, or unsupported option or level was specified in the fnet_socket_getopt(), or fnet_socket_setopt() call, or a socket received Parameter Problem ICMP Error Message.
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| FNET_ERR_PROTONOSUPPORT | Protocol not supported.
This error occurs if an application attempts to call fnet_socket() and the requested protocol has not been configured into the system, or no implementation for it exists.
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| FNET_ERR_OPNOTSUPP | Operation not supported.
The attempted operation is not supported for the type of socket referenced. This occurs, when socket cannot support the requested operation, for example trying to accept a connection on a datagram socket.
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| FNET_ERR_AFNOSUPPORT | Address family not supported by the protocol family.
The stack supports only the AF_INET family. This error will be returned, if an address of a wrong family is used for a socket in fnet_socket(), fnet_socket_sendto(), fnet_socket_connect(), fnet_socket_bind(), fnet_socket_getname(), and in fnet_socket_getpeername().
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| FNET_ERR_ADDRINUSE | Address already in use.
This error occurs, if an application attempts to fnet_socket_bind() or fnet_socket_connect() a socket to an IP address and port that has already been used for an existing socket, or a socket that wasn't closed properly, or one that is still in the process of closing. Only one usage of each socket address is permitted.
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| FNET_ERR_ADDRNOTAVAIL | Cannot assign the requested address.
The requested address is not valid in its context. It normally results from an attempt to fnet_socket_bind() to an address that is not valid for the local machine. This may also result from fnet_socket_connect(), when the remote address or port is not valid for a remote machine (for example address or port is 0).
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| FNET_ERR_NETUNREACH | The network is unreachable.
This error occurs, if socket cannot function at this time, because the underlying network interface it uses to provide the network services is unavailable.
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| FNET_ERR_CONNABORTED | Software caused the connection abort.
An established connection was aborted due to a data transmission or connection timeouts.
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| FNET_ERR_CONNRESET | Connection reset by peer.
A connection was forcibly closed by the remote host. This normally results, if the peer application on the remote host has suddenly stopped, the host has rebooted, or the remote host used a "hard close" on the remote socket.
For the UDP sockets, the remote host was unable to deliver a previously sent UDP datagram and responded with a "Port Unreachable" ICMP packet. The application should close the socket as it is no longer usable.
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| FNET_ERR_ISCONN | Socket is already connected.
A fnet_socket_connect() or fnet_socket_listen() request was made on an already connected socket.
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| FNET_ERR_NOTCONN | Socket is not connected.
A request to send or receive data was not allowed because the socket is not connected.
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| FNET_ERR_SHUTDOWN | The socket has been shut down.
A request to send or receive data was not allowed because the socket had already been shut down in that direction with a previous fnet_socket_shutdown() call.
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| FNET_ERR_INPROGRESS | The action is in progress.
An operation was attempted on a socket that already had an operation in progress - in other words calling fnet_socket_connect() a second time on a socket that is already connecting.
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| FNET_ERR_TIMEDOUT | The connection has timed out.
A connection attempt failed because the connected party did not properly respond after a period of time.
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| FNET_ERR_HOSTUNREACH | No route to a host.
A socket operation was attempted to an unreachable host.
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| FNET_ERR_SYSNOTREADY | Network subsystem is unavailable.
The stack is not initialized.
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| FNET_ERR_CONNCLOSED | Connection closed by peer.
The final (FIN) segment arrived and there is no data in the socket receive buffer. The remote host closed connection and will not send any data in the current connection.
The application should close the socket as it is no longer usable.
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| FNET_ERR_IPDISABLED | IP operation is disabled.
It happens when Duplicate Address Detection fails for interface link-local address, formed from an interface identifier based on the hardware address.
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| FNET_ERR_BAD_DESC | Bad socket descriptor.
An operation was attempted on a socket descriptor that does not refer to a valid socket.
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