Tcp Client Socket Download

This simple example creates a new WebSocket, connecting to the server at wss://www.example.com/socketserver. A custom protocol of "protocolOne" is named in the request for the socket in this example, though this can be omitted.

It may be helpful to examine the socket's bufferedAmount attribute before attempting to close the connection to determine if any data has yet to be transmitted on the network. If this value isn't 0, there's pending data still, so you may wish to wait before closing the connection.

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\n This simple example creates a new WebSocket, connecting to the server at wss://www.example.com/socketserver.\n A custom protocol of \"protocolOne\" is named in the request for the socket in this example, though this can be omitted.\n

\n It may be helpful to examine the socket's bufferedAmount attribute before attempting to close the connection to determine if any data has yet to be transmitted on the network.\n If this value isn't 0, there's pending data still, so you may wish to wait before closing the connection.\n

Hi I was able to connect my client to my server, but it has only one to one relationship( 1 client to server). My question in what should I do so that I can connect many client to my server? does anyone has an idea about my situation? any help will be appreciated, thanks in advance... Below is my codes.

When your server's socket receives a connect attempt from a client, s.accept() returns the a socket object and ip,port information. What you need to do is save this new socket object in a list and poll this list.

However, the problem with this implementation is that each loop of the 'while True:' block will result in a blocking call to server.accept(), meaning it will spin-loop on that line until a new client connects. As well, the c.recv(1024) call is also blocking, meaning that if you have 15 clients, each client will need to send data before the loop iterates over again.

For example, if you have two clients, and one client doesnt send data for a minute, the other client is effectively cut off. The buffer can overflow and block the sending side, and other various nasty things can occur.

There is a way to set these arguments to act asynchronously, but it escapes me right now.The good thing about asynchronous calls is that it will let you handle multiple clients, with proper error checking for no data received. However, this does not scale well for medium-large numbers of clients on one server.

One way to overcome this, at least on linux machines, (and windows, with only sockets) is to use the python 'select' module.The select module, to paraphrase, will check the sockets for any waiting connections or data.

So every time the server socket receives a connection attempt, it will be returned by 'select' in the 'inputready' list. Similarly, any clients that have sent data to the server will be returned in the same 'inputready' list, so you must check to see which socket was returned to handle it appropriately.

There are python frameworks such as Twisted that allow you to create simple servers by settings a few parameters, but I am not familiar with it. It may be worth looking into, as low level socket programming is very unforgiving.

As an aside, note that disconnects and sends from the server to clients are not handled in this framework presented above, although it can be implemented. Disconnects are signaled from one end by sending a packet with 0 length data. So the c.recv() call will return an empty string.

I have a 9.5.4 Relay (Win2008R2 VM) and many Clients connecting to it are showing this error in their BES client log files and are unable to post results to it (yes others Clients using it are able to).

If you point them to another relay do they work? Or not at all? One way to try is to temporarily turn down this relay, then cycle one of your clients. Does it start reporting correctly to another relay or root?

If the issue persists when the clients try to connect to another known good relay, consider doing a client reset. (Stop client service and deleting these reg keys under \Bigfix\EnterpriseClient\GlobalOptions: ComputerID, RegCount, and ReportSequenceNumber. Delete the __BESData folder then restart client service.)

To say its a winsock error is great and all but we need more to go to get to root cause. Restarting the machine obviously clears something up but we need to know what that something is. Any MS hotfixes anyone recalls for winsock errors with BES client?

Hi, I want to figure out how to get the CC3200 to quickly detect a dropped client (client closes socket) with the CC3200 running as a socket server operating with periodic calls to a non-blocking socket read sl_Recv().

I'm running my CC3200 in P2P mode as a socket server after the P2P network is established (CC3200 is P2P client), after the SL_NETAPP_IPV4_ACQUIRED event. It's a non-OS app with periodic calls to a non-blocking socket read, sl_Recv(). This works great for my purpose, but I can't seem to detect when the socket client drops the socket connection unless I actually try to write out the socket with the CC3200, in which case, I'll get a SL_SOC_ERROR returned from the sl_Send() call. I was hoping to avoid writing data out just to detect the dropped connection.

but I'm not getting any events fired here when the group owner (the device on the other side of the CC3200 P2P socket connection) closes the socket, and the manual section 19.3 doesn't reference SL_SOCKET_CLOSED events.

I tried enabling SL_SO_KEEPALIVE on the CC3200 side, ( how to reduce 300 second keep alive interval? ) waited 5+ minutes, but still no events were fired off on the CC3200 side after the client had closed the socket.

In this case, our Ignition client is running on different host machine from Ignition tag server.

Is it possible we establish tcp socket connection to another remote host from ignition client machine?

TCP client side keep-alives in the Web Agent can be enabled by setting the SM_ENABLE_TCP_KEEPALIVE environment variable to 1 on the agent machine. Enabling TCP keep-alives allows the Web Agent to detect when established connections to one or more Policy Servers have been terminated ungracefully. More importantly, it allows the Web Agent to re-establish connections with the Policy Server after such a network interruption.

Figured out a solution in the meantime: I noted, that my working Python script was using an older version of socket.io-client.

So I downgraded the npm module to 2.4.0 and it works now.

So it looks like the 3.1.1 cannot parse the Volumio messages anymore or it needs to be called differently (although I do not get any errors). Do not have enough time right now, to dig into details. Will do so later and post an update.

Fix for the time being:

The actual work of the socket is performed by an instance of the SocketImpl class. An application, by changing the socket factory that creates the socket implementation, can configure itself to create sockets appropriate to the local firewall.Since:JDK1.0See Also:setSocketImplFactory(java.net.SocketImplFactory), SocketImpl, SocketChannelConstructor SummaryConstructors ModifierConstructor and Description Socket()Creates an unconnected socket, with the system-default type of SocketImpl. Socket(InetAddress address, int port)Creates a stream socket and connects it to the specified port number at the specified IP address. Socket(InetAddress host, int port, boolean stream)Deprecated. Use DatagramSocket instead for UDP transport. Socket(InetAddress address, int port, InetAddress localAddr, int localPort)Creates a socket and connects it to the specified remote address on the specified remote port. Socket(Proxy proxy)Creates an unconnected socket, specifying the type of proxy, if any, that should be used regardless of any other settings.protected Socket(SocketImpl impl)Creates an unconnected Socket with a user-specified SocketImpl. Socket(String host, int port)Creates a stream socket and connects it to the specified port number on the named host. Socket(String host, int port, boolean stream)Deprecated. Use DatagramSocket instead for UDP transport. Socket(String host, int port, InetAddress localAddr, int localPort)Creates a socket and connects it to the specified remote host on the specified remote port.Method SummaryAll Methods Static Methods Instance Methods Concrete Methods Modifier and TypeMethod and Descriptionvoidbind(SocketAddress bindpoint)Binds the socket to a local address.voidclose()Closes this socket.voidconnect(SocketAddress endpoint)Connects this socket to the server.voidconnect(SocketAddress endpoint, int timeout)Connects this socket to the server with a specified timeout value.SocketChannelgetChannel()Returns the unique SocketChannel object associated with this socket, if any.InetAddressgetInetAddress()Returns the address to which the socket is connected.InputStreamgetInputStream()Returns an input stream for this socket.booleangetKeepAlive()Tests if SO_KEEPALIVE is enabled.InetAddressgetLocalAddress()Gets the local address to which the socket is bound.intgetLocalPort()Returns the local port number to which this socket is bound.SocketAddressgetLocalSocketAddress()Returns the address of the endpoint this socket is bound to.booleangetOOBInline()Tests if SO_OOBINLINE is enabled.OutputStreamgetOutputStream()Returns an output stream for this socket.intgetPort()Returns the remote port number to which this socket is connected.intgetReceiveBufferSize()Gets the value of the SO_RCVBUF option for this Socket, that is the buffer size used by the platform for input on this Socket.SocketAddressgetRemoteSocketAddress()Returns the address of the endpoint this socket is connected to, or null if it is unconnected.booleangetReuseAddress()Tests if SO_REUSEADDR is enabled.intgetSendBufferSize()Get value of the SO_SNDBUF option for this Socket, that is the buffer size used by the platform for output on this Socket.intgetSoLinger()Returns setting for SO_LINGER.intgetSoTimeout()Returns setting for SO_TIMEOUT.booleangetTcpNoDelay()Tests if TCP_NODELAY is enabled.intgetTrafficClass()Gets traffic class or type-of-service in the IP header for packets sent from this SocketbooleanisBound()Returns the binding state of the socket.booleanisClosed()Returns the closed state of the socket.booleanisConnected()Returns the connection state of the socket.booleanisInputShutdown()Returns whether the read-half of the socket connection is closed.booleanisOutputShutdown()Returns whether the write-half of the socket connection is closed.voidsendUrgentData(int data)Send one byte of urgent data on the socket.voidsetKeepAlive(boolean on)Enable/disable SO_KEEPALIVE.voidsetOOBInline(boolean on)Enable/disable SO_OOBINLINE (receipt of TCP urgent data) By default, this option is disabled and TCP urgent data received on a socket is silently discarded.voidsetPerformancePreferences(int connectionTime, int latency, int bandwidth)Sets performance preferences for this socket.voidsetReceiveBufferSize(int size)Sets the SO_RCVBUF option to the specified value for this Socket.voidsetReuseAddress(boolean on)Enable/disable the SO_REUSEADDR socket option.voidsetSendBufferSize(int size)Sets the SO_SNDBUF option to the specified value for this Socket.static voidsetSocketImplFactory(SocketImplFactory fac)Sets the client socket implementation factory for the application.voidsetSoLinger(boolean on, int linger)Enable/disable SO_LINGER with the specified linger time in seconds.voidsetSoTimeout(int timeout)Enable/disable SO_TIMEOUT with the specified timeout, in milliseconds.voidsetTcpNoDelay(boolean on)Enable/disable TCP_NODELAY (disable/enable Nagle's algorithm).voidsetTrafficClass(int tc)Sets traffic class or type-of-service octet in the IP header for packets sent from this Socket.voidshutdownInput()Places the input stream for this socket at "end of stream".voidshutdownOutput()Disables the output stream for this socket.StringtoString()Converts this socket to a String.Methods inherited from class java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitConstructor DetailSocketpublic Socket()Creates an unconnected socket, with the system-default type of SocketImpl.Since:JDK1.1Socketpublic Socket(Proxy proxy)Creates an unconnected socket, specifying the type of proxy, if any, that should be used regardless of any other settings. If there is a security manager, its checkConnect method is called with the proxy host address and port number as its arguments. This could result in a SecurityException. Examples: Socket s = new Socket(Proxy.NO_PROXY); will create a plain socket ignoring any other proxy configuration. Socket s = new Socket(new Proxy(Proxy.Type.SOCKS, new InetSocketAddress("socks.mydom.com", 1080))); will create a socket connecting through the specified SOCKS proxy server. Parameters:proxy - a Proxy object specifying what kind of proxying should be used.Throws:IllegalArgumentException - if the proxy is of an invalid type or null.SecurityException - if a security manager is present and permission to connect to the proxy is denied.Since:1.5See Also:ProxySelector, ProxySocketprotected Socket(SocketImpl impl) throws SocketExceptionCreates an unconnected Socket with a user-specified SocketImpl. Parameters:impl - an instance of a SocketImpl the subclass wishes to use on the Socket.Throws:SocketException - if there is an error in the underlying protocol, such as a TCP error.Since:JDK1.1Socketpublic Socket(String host, int port) throws UnknownHostException, IOExceptionCreates a stream socket and connects it to the specified port number on the named host. If the specified host is null it is the equivalent of specifying the address as InetAddress.getByName(null). In other words, it is equivalent to specifying an address of the loopback interface. e24fc04721