Hi,
at that line is moteIF.send(1,msg). Actually it is always at that point no
matter what I do. I didn't intend any infinite loop. All I wanted to do is to
send the received message, that is 1 message, back to my motes, after I have
received it. Haven't tried your suggestion yet.
Thanks
Nicole
> Hi Nicole,
>
> Which line is at line 109 in your original ConvCast.java file? This is
> where apparently there is a NullPointerException.
>
> In the anonymous class for handling received UpflowResultMsg messages
> you seem to have an infinite loop. Is this intended? Or would you rather
> want to start sending some messages once you received the first
> UpflowResultMsg message? With your current solution you probably block
> the receive thread in MoteIF, so this could cause all sorts of errors.
> You should rather start a new thread there.
>
> In the code below there is an inner class (should be declared within the
> ConvCast class) called UpflowPhase2. In the handlerType1() method an
> instance of this class is created to send the messages in a separate
> thread. Note that private members (such as the constructor) are
> accessible from ConvCast since ConvCast.UpflowPhase2 is an inner class.
>
> Cheers,
> Urs
>
> public void init(String source) {
> PhoenixSource phoenix;
>
> if (source == null) {
> phoenix = BuildSource.makePhoenix(PrintStreamMessenger.err);
> } else {
> phoenix = BuildSource.makePhoenix(source,
> PrintStreamMessenger.err);
> }
>
> MoteIF mif = new MoteIF(phoenix);
> mif.registerListener(new UpflowResultMsg(), new MessageListener() {
> public void messageReceived(int to, Message msg) {
> handlerType1(to,msg);
> }
> });
>
> mif.registerListener(new VerificationResultMsg(), new
> MessageListener() {
> public void messageReceived(int to, Message msg) {
> handlerType2(to,msg);
> }
> });
> }
>
> private void handlerType1(int to, Message msg) {
> if (msg instanceof UpflowResultMsg) {
> UpflowResultMsg rmsg = (UpflowResultMsg)msg;
> System.out.println("UpflowResultMessage received. Nonce = " +
> rmsg.get_rndNonce() + " aggregated data " +
> rmsg.get_aggregatedData() + " ");
> UpflowPhase2 thread = new UpflowPhase2(msg);
> thread.start();
> }
> }
>
> private class UpflowPhase2 extends Thread {
> private Message msg;
>
> private UpflowPhase2(Message msg) {
> this.msg = msg;
> }
>
> public void run() {
> try {
> while (true) {
> moteIF.send(1,msg);
> System.out.println("Sending UpflowResult starting
> 2.Phase");
> try { Thread.sleep(1000);}
> catch (InterruptedException exception){}
> }
> } catch (IOException exception) {
> System.err.println("Exception thrown when sending packets.
> Exiting.");
> System.err.println(exception);
> }
> }
> }
>
> Nicole Neureiter wrote:
> > Hi my code at the moment is as follows:
> > [..]
> >
> > what I get out is:
> > UpflowResultMessage received. Nonce = 14190152 aggregated data 1629520098
> > Exception in thread "Thread-1" java.lang.NullPointerException
> > at ConvCast$1.messageReceived(ConvCast.java:109)
> > at net.tinyos.message.Receiver.packetReceived(Receiver.java:210)
> > at net.tinyos.packet.PhoenixSource.dispatch(PhoenixSource.java:160)
> > at
> > net.tinyos.packet.PhoenixSource.packetDipatchLoop(PhoenixSource.java:152)
> > at net.tinyos.packet.PhoenixSource.run(PhoenixSource.java:169)
> >
>
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