The isConnected method won’t help, it will return true even if the remote side has closed the socket. Try this: public class MyServer { public static final int PORT = 12345; public static void main(String[] args) throws IOException, InterruptedException { ServerSocket ss = ServerSocketFactory.getDefault().createServerSocket(PORT); Socket s = ss.accept(); Thread.sleep(5000); ss.close(); s.close(); } } public class … Read more
Well, the most likely difference is that you still have to do an actual lookup of localhost somewhere. If you use 127.0.0.1, then (intelligent) software will just turn that directly into an IP address and use it. Some implementations of gethostbyname will detect the dotted format (and presumably the equivalent IPv6 format) and not do … Read more
If the problem is to find whether the phone’s network is connected and fast enough to meet your demands you have to handle all the network types returned by getSubType(). It took me an hour or two to research and write this class to do just exactly that, and I thought I would share it … Read more
Listen for CONNECTIVITY_ACTION This looks like good sample code. Here is a snippet: BroadcastReceiver networkStateReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { Log.w(“Network Listener”, “Network Type Changed”); } }; IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION); registerReceiver(networkStateReceiver, filter);
People say that the major thing TCP gives you is reliability. But that’s not really true. The most important thing TCP gives you is congestion control: you can run 100 TCP connections across a DSL link all going at max speed, and all 100 connections will be productive, because they all “sense” the available bandwidth. … Read more
I’ve written something similar to this in the past. From my research years ago showed that writing your own socket implementation was the best bet, using the asynchronous sockets. This meant that clients not really doing anything actually required relatively few resources. Anything that does occur is handled by the .NET thread pool. I wrote … Read more
Here are some suggestions: For Android phones, any network: Root your phone, then install tcpdump on it. This app is a tcpdump wrapper that will install tcpdump and enable you to start captures using a GUI. Tip: You will need to make sure you supply the right interface name for the capture and this varies … Read more
You should connect to the place that your actual application needs. Otherwise you’re testing whether you have a connection to somewhere irrelevant (Google in this case). In particular, if you’re trying to talk to a web service, and if you’re in control of the web service, it would be a good idea to have some … Read more
I realise that there is no API on 3.x or 4.x for those setting per SSID. Therefore, I checked out the source code and found out that the configuration of each SSID is stored in android.net.wifi.WifiConfiguration which is gotten from android.net.wifi.WifiManager. In the below code, IpAssignment is an Enum, either STAIC, DHCP or NONE. And … Read more
Two methods: Method #1 (use external package) You need to ask for the IP address that is bound to your eth0 interface. This is available from the netifaces package import netifaces as ni ip = ni.ifaddresses(‘eth0’)[ni.AF_INET][0][‘addr’] print(ip) # should print “192.168.100.37” You can also get a list of all available interfaces via ni.interfaces() Method #2 … Read more