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POConnection error while communicating to wiFly
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  1. POConnection error while communicating to wiFly
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    copied!<p>I am trying to set up communication between my android device and <a href="https://www.sparkfun.com/products/9954" rel="nofollow" title="wiFly">wiFly</a>(RN-171) module. I create an ad-hoc network on the android device and connect the wiFly to the network. The wiFly is configured to listen on 169.254.1.1:2000. I create socket in the app to communicate with the wiFly. Code:</p> <pre><code>import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.Socket; import java.net.UnknownHostException; import android.os.Bundle; import android.os.StrictMode; import android.app.Activity; import android.view.Menu; public class MainActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder() .permitAll().build(); StrictMode.setThreadPolicy(policy); Socket echoSocket = null; PrintWriter out = null; BufferedReader in = null; try { echoSocket = new Socket("169.254.1.1", 2000); out = new PrintWriter(echoSocket.getOutputStream(), true); in = new BufferedReader(new InputStreamReader( echoSocket.getInputStream())); } catch (UnknownHostException e) { System.err.println("Don't know about host: wiFly."); System.exit(1); } catch (IOException e) { System.err.println("Couldn't get I/O for " + "the connection to: wiFly."); } BufferedReader stdIn = new BufferedReader( new InputStreamReader(System.in)); String userInput; while ((userInput = stdIn.readLine()) != null) { out.println(userInput); System.out.println("echo: " + in.readLine()); } out.close(); in.close(); stdIn.close(); echoSocket.close(); } } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_main, menu); return true; } } </code></pre> <p>Sorry for using StrictMode. Will switch to AsyncTask once this runs. Following is the warning message:</p> <pre><code>03-29 21:55:40.352: W/AdHoc(15118): failed to connect to /169.254.1.1 (port 2000): connect failed: ENETUNREACH (Network is unreachable) 03-29 21:55:40.352: W/System.err(15118): java.net.ConnectException: failed to connect to /169.254.1.1 (port 2000): connect failed: ENETUNREACH (Network is unreachable) 03-29 21:55:40.362: W/System.err(15118): at libcore.io.IoBridge.connect(IoBridge.java:114) 03-29 21:55:40.362: W/System.err(15118): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192) 03-29 21:55:40.362: W/System.err(15118): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) 03-29 21:55:40.362: W/System.err(15118): at java.net.Socket.startupSocket(Socket.java:566) 03-29 21:55:40.362: W/System.err(15118): at java.net.Socket.tryAllAddresses(Socket.java:127) 03-29 21:55:40.362: W/System.err(15118): at java.net.Socket.&lt;init&gt;(Socket.java:177) 03-29 21:55:40.362: W/System.err(15118): at java.net.Socket.&lt;init&gt;(Socket.java:149) 03-29 21:55:40.362: W/System.err(15118): at com.example.udp.MainActivity.onCreate(MainActivity.java:33) 03-29 21:55:40.362: W/System.err(15118): at android.app.Activity.performCreate(Activity.java:4492) 03-29 21:55:40.362: W/System.err(15118): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 03-29 21:55:40.362: W/System.err(15118): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 03-29 21:55:40.362: W/System.err(15118): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 03-29 21:55:40.372: W/System.err(15118): at android.app.ActivityThread.access$600(ActivityThread.java:123) 03-29 21:55:40.372: W/System.err(15118): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 03-29 21:55:40.372: W/System.err(15118): at android.os.Handler.dispatchMessage(Handler.java:99) 03-29 21:55:40.372: W/System.err(15118): at android.os.Looper.loop(Looper.java:137) 03-29 21:55:40.372: W/System.err(15118): at android.app.ActivityThread.main(ActivityThread.java:4424) 03-29 21:55:40.372: W/System.err(15118): at java.lang.reflect.Method.invokeNative(Native Method) 03-29 21:55:40.372: W/System.err(15118): at java.lang.reflect.Method.invoke(Method.java:511) 03-29 21:55:40.382: W/System.err(15118): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 03-29 21:55:40.382: W/System.err(15118): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 03-29 21:55:40.382: W/System.err(15118): at dalvik.system.NativeStart.main(Native Method) 03-29 21:55:40.382: W/System.err(15118): Caused by: libcore.io.ErrnoException: connect failed: ENETUNREACH (Network is unreachable) 03-29 21:55:40.382: W/System.err(15118): at libcore.io.Posix.connect(Native Method) 03-29 21:55:40.382: W/System.err(15118): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:85) 03-29 21:55:40.382: W/System.err(15118): at libcore.io.IoBridge.connectErrno(IoBridge.java:127) 03-29 21:55:40.382: W/System.err(15118): at libcore.io.IoBridge.connect(IoBridge.java:112) 03-29 21:55:40.382: W/System.err(15118): ... 21 more 03-29 21:55:40.392: W/System.err(15118): Couldn't get I/O for the connection to: wiFly. </code></pre> <p>I run it on android 4.0.4, and have included all the necessary permission needed in the Manifest file.</p>
 

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