Both read and write return the number of bytes read/written, or -1 on error. Note, that to be able to invoke read/write on a UDP socket (or, more generally, on a datagram socket) you have to invoke connect on it beforehand to specify the peer address. 1 solved differences of n in TCP and UDP?
When it comes to peer2peer, you always need at least one PC who has port forwarding enabled. This means, that if you have a listener/server at pc1 and a client at pc2, you would need a port forwarding on pc1. This is called HighID/LowID in general and is a symptom of the NAT firewall implemented … Read more
What you are trying to do is not possible with plain TCP. TCP works on plain IP-Addresses without domains. To explain what is going on: When you are establishing a connection to, e.g. example.com, first of all a DNS Lookup for example.com is done. In this case, the DNS Lookup would result in 93.184.216.34. You … Read more
listenfd = lacz_tcp(wiadomosc->port); From what I can tell, the port has not been initialized before you call bind. Log the port to be sure that the server is listening on the correct port. 2 solved Connection refused – tcp socket in linux [closed]
Try using this: package main import ( “encoding/binary” “io” ) func ReadPacket(r io.Reader) ([]byte, error) { lenB := make([]byte, 4) if _, err := r.Read(lenB); err != nil { return nil, err } //you can use BigEndian depending on the proto l := binary.LittleEndian.Uint32(lenB) packet := make([]byte, l) _, err := r.Read(packet) return packet, err … Read more
In your server code the read() should use the socket descriptor returned from the accept() not from the call to socket(). So try reading using newSocket rather than welcomeSocket. n = read(newSocket,buffer,255); 1 solved Server Client program in C using sockets and tcp
Check this thing out : TCP Server But I would recommend you to start with gen_tcp and gen_udp modules first before getting started with OTP framework to design your server/Client. Happy Erlang Coding 🙂 solved How to build a TCP server with erlang?
I do not know what you mean by device (any device located in /dev?), but here is a tutorial on c sockets using write and read: https://vcansimplify.wordpress.com/2013/03/14/c-socket-tutorial-echo-server/ If you would like to gain access to a device in /dev then you just need to open it like a file and also treat it like a … Read more
The read tcp […]->[…]: i/o timeout error is generated here. The underlying timeout error is defined here. solved Locating the “read tcp” error in the Go source code