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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