Java Xbee API-数据包侦听器似乎无法工作
我有一个类正在尝试从与Arduino板连接的其他XBEE读取数据包。下面是课堂:Java Xbee API-数据包侦听器似乎无法工作,java,xbee,Java,Xbee,我有一个类正在尝试从与Arduino板连接的其他XBEE读取数据包。下面是课堂: public class XbeeReceiver2 { private XBee xbee; private int[] payloadToSend; private int[] payloadReceived; private Queue<XBeeResponse> queue = new ConcurrentLinkedQueue<XBeeResponse&
public class XbeeReceiver2 {
private XBee xbee;
private int[] payloadToSend;
private int[] payloadReceived;
private Queue<XBeeResponse> queue = new ConcurrentLinkedQueue<XBeeResponse>();
public XBeeResponse response;
private final static Logger LOGGER = Logger.getLogger(XbeeReceiver2.class .getName());
public XbeeReceiver2(){
xbee = new XBee();
}
public void openXbeeConnection(String portNumber){
try {
xbee.open(portNumber, 9600);
xbee.addPacketListener(new PacketHandler());
} catch (XBeeException e) {
System.out.println("" + portNumber + " - connection problems");
e.printStackTrace();
}
};
public void readPacket(){
System.out.println(queue.isEmpty());
while((response = queue.poll()) != null){
try {
response = xbee.getResponse();
LOGGER.info("received response " + response.toString());
if (response.getApiId() == ApiId.ZNET_RX_RESPONSE){
ZNetRxResponse rx = (ZNetRxResponse) response;
payloadReceived = rx.getData();
}
} catch (XBeeException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
public void closeXbeeConnection(){
xbee.close();
};
private class PacketHandler implements PacketListener{
@Override
public void processResponse(XBeeResponse response) {
//if (response instanceof XBeeResponse){
queue.offer(response);
//}
}
}
}
但是,当我运行它时,readPacket()
方法将卡在循环的开头,因为队列中存储了XbeerResponse的任何实例。但是,当我将readPacket()方法中的while
条件从while((response=queue.poll())!=null)
更改为while(true)
,它就会工作。这意味着我得到了响应,但我不认为使用while(true)
是一个好的解决方案,正如我在一些页面上看到的那样。因此,我更喜欢使用PacketListener
如果有人有什么想法,为什么我的
PacketListener
不起作用,那就太好了。好的,我找到了一个解决方案,没那么难。在开始循环之前,我从Xbee获得了一个响应并将其添加到队列中,所以它在开始时并没有中断。和我在while循环结束时做的一样,我添加了另一个响应
这是我的openConnection
方法:
public void openXbeeConnection(String portNumber){
try {
xbee.open(portNumber, 57600);
xbee.addPacketListener(new PacketHandler());
response = xbee.getResponse();
queue.add(response);
} catch (XBeeException e) {
System.out.println("" + portNumber + " - connection problems");
e.printStackTrace();
}
};
在main方法的while循环中,它如下所示:
while ((response = queue.poll()) != null){
//LOGGER.info(response.toString());
int[] payload = xbeeReceiver.readPacket();
dbHandler.updateDB(payload);
int[] payloadToSend2 = dbHandler.retrieveDataFromFB();
xbeeReceiver.sendPacket(payloadToSend2);
try {
XBee xbee = xbeeReceiver.getXbee();
response = xbee.getResponse();
queue.add(response);
} catch (XBeeException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
while ((response = queue.poll()) != null){
//LOGGER.info(response.toString());
int[] payload = xbeeReceiver.readPacket();
dbHandler.updateDB(payload);
int[] payloadToSend2 = dbHandler.retrieveDataFromFB();
xbeeReceiver.sendPacket(payloadToSend2);
try {
XBee xbee = xbeeReceiver.getXbee();
response = xbee.getResponse();
queue.add(response);
} catch (XBeeException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}