dbus-java for Bluetooth HDP

[Santiago Perez]

Hi Jim.
I have tried to develop a X73 Manager for a Blood Pressure Monitor with BT HDP and Java, but nowadays the Java binding doesn't support the datatype "File Descriptor". 
 
A file descriptor is needed because is the way in which the device sends data to the manager. It is defined in the "health API" doc of bluez, the org.bluez.HealthChannel interface has the method "fd Acquire()" (fd: file descriptor).
 
The Java binding's author (Matthew Johnson dbus at matthew.ath.cx) said to me that he cannot to incorporate that datatype at the moment. I tried it, but it isn't easy...
 
Anyway, related to your code I see a few things:
- You have to work with a dBus connection for the current Session, no with the dBus system... way? I don't know. I just know that the Bluetooth HDP only creates the HealthManager in the dBus Session, not in the dBus System...
- You don't need to get the remote object for the dBus connection! 
 
This is my code and it works, I hope it is useful for you:
 
Cheers,
Santiago
 
-------------
 
 
//Getting a DBus connection
try {
 dbusConn = DBusConnection.getConnection(DBusConnection.SESSION);
} catch (DBusException e) {   
 throw new BusinessRuleException(BusinessRuleError.ERROR_CONNECTION_DBUS, errorBundle.getString(Integer.toString(BusinessRuleError.ERROR_CONNECTION_DBUS)));
}
if(dbusConn == null)
{
 throw new BusinessRuleException(BusinessRuleError.ERROR_CONNECTION_DBUS, errorBundle.getString(Integer.toString(BusinessRuleError.ERROR_CONNECTION_DBUS)));      
}
  
//Getting the HealthManager object
try {
 bluezHealthManager = dbusConn.getRemoteObject("org.bluez", "/org/bluez", org.bluez.HealthManager.class);
} catch (DBusException e) {
 throw new BusinessRuleException(BusinessRuleError.ERROR_HEALTHMANAGER_BLUEZ, errorBundle.getString(Integer.toString(BusinessRuleError.ERROR_HEALTHMANAGER_BLUEZ)));
}
if(bluezHealthManager == null)
{
 throw new BusinessRuleException(BusinessRuleError.ERROR_HEALTHMANAGER_BLUEZ, errorBundle.getString(Integer.toString(BusinessRuleError.ERROR_HEALTHMANAGER_BLUEZ)));      
}
  
//Registering the X73 Manager for a Blood Pressure Monitor in dBus
Map<String, Variant> dictionary = new HashMap<String, Variant>();
 
UInt16 managerType = new UInt16(0x1007); 
dictionary.put("DataType", new Variant(managerType)); 
dictionary.put("Role",new Variant(strRole));
dictionary.put("Description",new Variant(strDescription));
dictionary.put("ChannelType",new Variant(strChannelType));
  
Path managerPath = null;
managerPath = bluezHealthManager.CreateApplication(dictionary);
if(managerPath == null)
{
 throw new BusinessRuleException(BusinessRuleError.ERROR_REGISTER_X73MANAGER_DBUS, errorBundle.getString(Integer.toString(BusinessRuleError.ERROR_REGISTER_X73MANAGER_DBUS)));      
}
 
 
 
The HealthManager interface in Java is defined as:
 
package org.bluez;
import java.util.Map;

import org.freedesktop.dbus.DBusInterface;
import org.freedesktop.dbus.Path;
import org.freedesktop.dbus.Variant;
 
public interface HealthManager extends DBusInterface
{
  public Path CreateApplication(Map<String,Variant> dic);
  public void DestroyApplication(Path o);
}

 
 
---------------

 

> Date: Thu, 14 Jul 2011 17:21:46 -0400
> From: james.connors at oracle.com
> To: dbus at lists.freedesktop.org
> Subject: dbus-java for Bluetooth HDP
> 
> Hello,
> 
> I'm trying to use dbus-java to communicate with a bluetooth Heathcare 
> Device Profile (HDP) cpmpliant pulse oxymiter. There has been some work 
> demonstrating this capability with the Python dbus binding, but next to 
> nothing on the Java front from what I see. Not being a Python 
> aficionado, trying to map the Python stuff over to Java isn't working 
> out too well. The example below attempts to make a remote invocation 
> on a method called CreateApplication() as specified by the following 
> interface:
> 
> package org.bluez;
> import java.util.Map;
> import org.freedesktop.dbus.DBusInterface;
> import org.freedesktop.dbus.Variant;
> 
> public interface HealthManager extends DBusInterface
> {
> public DBusInterface CreateApplication(Map<String,Variant> a);
> public void DestroyApplication(DBusInterface a);
> }
> 
> The simple application below throws a DBusExecution exception when 
> reaching the CreateApplication() method call:
> 
> package testhdp;
> 
> import java.util.Map;
> import java.util.HashMap;
> import org.freedesktop.DBus;
> import org.freedesktop.dbus.DBusConnection;
> import org.freedesktop.dbus.DBusInterface;
> import org.freedesktop.dbus.Variant;
> import org.freedesktop.dbus.UInt16;
> import org.bluez.Manager;
> import org.bluez.HealthManager;
> import org.freedesktop.DBus.Introspectable;
> 
> class TestHDP {
> 
> public static void main(String[] args) throws
> org.freedesktop.dbus.exceptions.DBusException {
> 
> DBusConnection conn =
> DBusConnection.getConnection(DBusConnection.SYSTEM);
> 
> DBus dbus = conn.getRemoteObject(
> "org.freedesktop.DBus", "/org/freedesktop/DBus", 
> DBus.class);
> 
> String ORG_BLUEZ = "org.bluez";
> System.out.print("Searching dbus.ListNames() return for " +
> "\"" + ORG_BLUEZ + "\": ");
> String[] names = dbus.ListNames();
> boolean bluezFound = false;
> for (String name: names)
> if (name.equals(ORG_BLUEZ)) {
> bluezFound = true;
> break;
> }
> if (bluezFound)
> System.out.println(ORG_BLUEZ + " found.");
> else
> System.out.println(ORG_BLUEZ + " not found.");
> 
> Manager m = (Manager) conn.getRemoteObject("org.bluez", "/",
> Manager.class);
> System.out.println(m.toString());
> Map<String, Variant> props = m.GetProperties();
> 
> HealthManager hm = (HealthManager) conn.getRemoteObject(
> "org.bluez", "/org/bluez", HealthManager.class);
> System.out.println(hm.toString());
> 
> Map<String, Variant> config = new HashMap<String, Variant>();
> config.put("DataType", new Variant<UInt16>(new UInt16(0x1004)));
> config.put("Role", new Variant<String>("Sink"));
> config.put("Description", new Variant<String>("Oximeter Sink"));
> 
> DBusInterface app = hm.CreateApplication(config);
> 
> conn.disconnect();
> }
> }
> 
> Output is as follows:
> 
> Searching dbus.ListNames() return for "org.bluez": org.bluez found.
> org.bluez:/:interface org.bluez.Manager
> org.bluez:/org/bluez:interface org.bluez.HealthManager
> Exception in thread "main" 
> org.freedesktop.dbus.exceptions.DBusExecutionException: Wrong return 
> type (failed to de-serialize correct types: Failed to create proxy 
> object for /org/bluez/health_app_30 exported by :1.51. Reason: Could not 
> find an interface to cast to )
> at org.freedesktop.dbus.RemoteInvocationHandler.convertRV(Unknown 
> Source)
> at 
> org.freedesktop.dbus.RemoteInvocationHandler.executeRemoteMethod(Unknown 
> Source)
> at org.freedesktop.dbus.RemoteInvocationHandler.invoke(Unknown Source)
> at $Proxy2.CreateApplication(Unknown Source)
> at testhdp.TestHDP.main(TestHDP.java:66)
> 
> 
> 
> Any guidance would be greatly appreciated.
> 
> Thanks,
> Jim Connors
> 
> _______________________________________________
> dbus mailing list
> dbus at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dbus
 		 	   		  
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