Cannot find where the issue is, Bluetooth service discovery
Hi there,
I am developing a client/server bluetooth messaging application and seem to have to run into a brick wall. I am able to perform a device discovery, and the client is able to locate the server, however I am not able to locate the service on the server even though the server and the client are both using the same UUID and service name.
It gets to the point where it displays the status message, "Service search initiated" and then it seems like nothing else happens. I have been staring at the code for days and tried all sorts of tinkering, but have been unable to get it to work.
The UUID and service name I am using is:
48dd1cf559bb41009d0686f7862d26a2
serverand below is the code for my class that I implement the device and services discovery in:
import javax.microedition.io.*;
import java.util.*;
import java.io.*;
import javax.bluetooth.*;
public class SearchForServices implements DiscoveryListener
private MessageClient client;
private String StrUUID; //UUID of service
private String nameOfService; // Name of service
private LocalDevice local; //local device
//Discovery Agent
private DiscoveryAgent discover;
//store list of found devices
private Vector devicesFound;
//table of matching services/ device name & service Record
private Hashtable servicesFound;
private boolean searchComplete;
private boolean terminateSearch;
public SearchForServices(MessageClient client, String uuid, String nameOfService)
//create the discovery listener and then perform device and services search
this.client = client;
this.StrUUID = uuid;
this.nameOfService = nameOfService;
//create service search data structure
this.servicesFound = new Hashtable();
try
//get discovery agent
local = LocalDevice.getLocalDevice();
discover = local.getDiscoveryAgent();
//create storage for device search
devicesFound = new Vector();
//begin search: first devices, then services
this.client.modifyStatus("Searching for devices...");
discover.startInquiry(DiscoveryAgent.GIAC, this);
catch(Exception e)
this.client.reportError("Unable to perform search");
/////////////Methods related to the device search called automatically///
public void deviceDiscovered(RemoteDevice remote, DeviceClass rank)
// a matching device is found.Only store if it's a PC or phone
int highRankDevice = rank.getMajorDeviceClass();
int lowRankDevice = rank.getMinorDeviceClass();
//restrict devices
if((highRankDevice == 0x0100) || (highRankDevice == 0x0200))
devicesFound.addElement(remote);
this.client.modifyStatus("Device Found");
else
this.client.reportError("Matching device not found");
private String deviceName(RemoteDevice remote)
String name = null;
try
name = remote.getFriendlyName(false);
catch(IOException e)
this.client.modifyStatus("Unable to get Friendly name");
return name;
public void inquiryCompleted(int inquiryMode)
showInquiryStatus(inquiryMode);
//update status
this.client.modifyStatus("Number of devices found: " + devicesFound.size());
// start searching for services
this.client.modifyStatus("Service search initiated");
findServices(devicesFound, this.StrUUID);
private void showInquiryStatus(int inquiryMode)
if(inquiryMode == INQUIRY_COMPLETED)
this.client.modifyStatus("Device Search Completed");
else if(inquiryMode == INQUIRY_TERMINATED)
this.client.modifyStatus("Device Search Terminated");
else if(inquiryMode == INQUIRY_ERROR)
this.client.modifyStatus("Error searching for devices");
//service search////
private void findServices(Vector devFound, String strUuid)
//Perform search for services that have a matching UUID
//and also check service name
UUID[] uuids = new UUID[1]; //holds UUIDs for searching
//add the one for the service in question
uuids[0] = new UUID(strUuid, false);
//to include search for service name attribute
int[] attributes = new int[1];
attributes[0] = 0x100;
//carry out service search for each device
//terminate search
this.terminateSearch = false;
RemoteDevice xremote;
for(int i=0; i < devFound.size(); i++)
xremote = (RemoteDevice)devFound.elementAt(i);
findService(xremote, attributes, uuids);
if(terminateSearch)
break;
//report status
if(servicesFound.size() > 0)
this.client.displayServices(servicesFound);
else
this.client.reportError("No Matching services found");
private void findService(RemoteDevice remote, int[] attributes, UUID[] uuid)
try
int transaction = this.discover.searchServices(attributes, uuid, remote, this);
searchFinished(transaction);
catch(BluetoothStateException e)
private void searchFinished(int transaction)
this.searchComplete = false;
while(!searchComplete)
synchronized(this)
try
this.wait();
catch(Exception e)
//below methods called automatically during a search for devices
public void servicesDiscovered(int transID, ServiceRecord[] records)
for(int i=0; i < records.length; i++)
if(records[i] != null)
//get service records name
DataElement servNameElem = records.getAttributeValue(0x0100);
String sName = (String)servNameElem.getValue();
//terminate search
this.terminateSearch = true;
if(sName.equals(this.nameOfService)) //check name
RemoteDevice rem = records[i].getHostDevice();
servicesFound.put(deviceName(rem), records[i]); //add to hashtable
public void serviceSearchCompleted(int transID, int respCode)
//wake up the waiting thread for this search, enabling the next services
//search to commence
this.searchComplete = true;
synchronized(this)
this.notifyAll();
After doing abit of troubleshooting, I realised that somehow the client is not able to locate the service on the Server, but I do not understand why that should be so, because the UUID and service name are matching on both the client and the server. It just beats me, and I would appreciate it if a 2nd pair of eyes could have a look at the code. Maybe there is something that I am missing.
Thanks, I do appreciate..
Hi there,
I tried a few things such as
1) Changing the UUID for my application, but that didn't make the system work.
2) I then went on to modify the implementation and use the selectService() method of the bluetooth class, but still without any luck.
The only way it works, is if I get the server side to display the connection parameters and I manually enter them into the client side to connect. I do not understand why it is not working the automatic way. I have scanned through my code and logic multiple times, and still cannot figure out what the issue is. :(
Any help would be appreciated...
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