My android app connects the server with TCP socket, to make sure the connection is ok, the server sends the "keep-alive" msg every 10s when idle, I can grab the packet in WireShark, but in my app, I can't handle the packet anywhere, seems that the packet can't be read with the socket.
Below is the code segment of my socket connection. Seems that the "keep-alive" packet just can't be read with the inputstream...
public class SocketBase {
private Socket mSocket;
private DataOutputStream out;
private DataInputStream in;
private SocketCallback callback;
private int timeOut = 1000 * 30;
public SocketBase(SocketCallback callback) {
this.callback = callback;
}
public void connect(String ip, int port) throws Exception {
mSocket = new Socket();
SocketAddress address = new InetSocketAddress(ip, port);
mSocket.connect(address, timeOut);
if (mSocket.isConnected()) {
out = new DataOutputStream(mSocket.getOutputStream());
in = new DataInputStream(mSocket.getInputStream());
callback.connected();
}
}
public void write(byte[] buffer) throws IOException {
if (out != null) {
out.write(buffer);
out.flush();
}
}
public void disconnect() {
try {
if (mSocket != null) {
if (!mSocket.isInputShutdown()) {
mSocket.shutdownInput();
}
if (!mSocket.isOutputShutdown()) {
mSocket.shutdownOutput();
}
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
mSocket.close();
}
} catch (Exception e) {
e.printStackTrace();
} finally {
callback.disconnect();
out = null;
in = null;
mSocket = null;
}
}
public void read() throws IOException {
if (in != null) {
byte[] buffer = new byte[1024*1];
byte[] tmpBuffer;
int len = 0;
Log.i("SOCKET", "something comming");
while ((len = in.read(buffer)) > 0) {
tmpBuffer = new byte[len];
System.arraycopy(buffer, 0, tmpBuffer, 0, len);
callback.receive(tmpBuffer);
tmpBuffer = null;
}
}
}
}
The "keep-alive" packet in WireShark is like this: