What shoud be write in the servicesDiscovered() method of bluetooth?

[gracy]

I downloaded a sample bluetooth s/w and try to study that.

As far as I understand, when we have found the bluetooth enabled devices, we search the devices with the service we want.
For that we use UUID.

In that sample s/w, in the deviceDiscovered(RemoteDevice btDevice, DeviceClass cod) method , it writes like that

 public void deviceDiscovered(RemoteDevice btDevice, DeviceClass cod)
UUID uuidSet[] = new UUID[1];     
      uuidSet[0] =  RFCOMM_UUID;      
      int searchID = m_DscrAgent.searchServices(null,uuidSet,btDevice,this);      //////////When we will use the id that return from the searchServices() ////method?

so by giving the second parameter of searchServices() method, we have specified the sevice we need.

But in the servicesDiscovered(int transID, ServiceRecord[] records) method, he test again like that

public void servicesDiscovered(int transID, ServiceRecord[] records)
  {
    
    for (int i = 0; i < records.length; i++)
    {
        m_strUrl = records[i].getConnectionURL(ServiceRecord.AUTHENTICATE_ENCRYPT, false); 
         
        System.out.println(m_strUrl);
        if(m_strUrl.startsWith("btspp")) //we have found our service protocol 
        {
            m_bServerFound = true;
            m_bInitClient=true;
           break;
        }
       
    } 
    
  }

Why we need to test whether the url starts with btspp?
Is it necessary?
We have specified the servies we need in the bluetooth devices we found by setting the second parameter of searchServices() method?
is it not enough?

What is the service record????

[grahamhughes]

What is the service record????

Each service record contains information about one of the services that have been found during the service discovery process.

Why we need to test whether the url starts with btspp?

It's a safe practice, and avoids any confusing results if service discovery returns something you don't expect.

Graham.

[traud]

Instead of using code examples, I do not understand, I would go for a book.

uuidSet[0] = RFCOMM_UUID;

A RFCOMM_UUID variable (I fear, it‘s value is 0x0003) is generic and could lead to an OBEX based service.

When we will use the id that return from the searchServices() method?

Theoretically, you could have several service searches in parallel.