Parameters

[in]	sock	Socket ID, must hold a non negative value. A negative value will return a socket error SOCK_ERR_INVALID_ARG. Indicating that an invalid argument is passed in.
[in]	pvRecvBuf	Pointer to a buffer that will hold the received data. The buffer shall be used in the recv callback to deliver the received data to the caller. The buffer must be resident in memory (heap or global buffer).
[in]	u16BufLen	The buffer size in bytes.
[in]	u32TimeoutSeconds	Timeout for the recv function in milli-seconds. If the value is set to ZERO, the timeout will be set to infinite (the recv function waits forever).

Precondition

• The socket function must be called to allocate a UDP socket before passing the socket ID to the recvfrom function.
• The socket corresponding to the socket ID must be successfully bound to a local port through the call to a bind function.

See also

socket bind close

Returns

The function returns ZERO for successful operations and a negative value otherwise. The possible error values are:

• SOCK_ERR_NO_ERROR Indicating that the operation was successful.
• SOCK_ERR_INVALID_ARG Indicating passing invalid arguments such as negative socket ID or NULL Receive buffer.
• SOCK_ERR_BUFFER_FULL Indicate socket receive failure.

Example

The example demonstrates a code snippet for the calling of the recvfrom function in the socket callback upon notification of a successful bind event, and the parsing of the received data when the SOCKET_MSG_RECVFROM event is received.