BytesReceived

Number of bytes received (>= 0 since it is possible to receive a 0 length datagram). If -1, no data has been received (if a timeout was specified this means we timed out). If < -1, an error occurred. The values that can be returned are:

Code	Description
>=0	Received a datagram with a payload of this many bytes. (It is possible to receive a zero-length UDP datagram.)
-1	Did not receive a datagram, even after potentially waiting if a timeout was set.
-2	Socket not initialized or was closed. (The only way this will be closed is if you call UDPSocketClose.)
-4	Invalid InDatagramLen (negative or greater than the size of the buffer)
-6	Invalid SocketID.

Type: Variable of type Long