Re: [Bluez-users] clearing remote name cache

[Marcel Holtmann <marcel@holtmann.org>]

Hi Emanuele,

> Hi using the hints about reading remote names from various threads I
> got on this ML time ago I started experiments with D-Bus API for
> bluez.
> 
> I tried to read a remotename in a thread called from another thread
> who does inquiry. 
> Each time he found a bdaddress he ask for a name
> (snipped code)
> 
> msg = dbus_message_new_method_call("org.bluez", "/org/bluez/hci0",
> "org.bluez.Adapter", "GetRemoteName"); 
> dbus_message_append_args(msg, DBUS_TYPE_STRING,
> &bdaddress,DBUS_TYPE_INVALID);
> reply = dbus_connection_send_with_reply_and_block(conn, msg, -1,
> &err);
>  if (reply == NULL) {
>  printf("Error %s\n", err.message);
> 
>   }
>  else {
>  dbus_message_get_args(reply, NULL, DBUS_TYPE_STRING, &name,
> DBUS_TYPE_INVALID);
>                 PBLOG_INFO("%s\n", name);
> }
> 
> all works well till I change the name of the remote device (a phone).
> Each time I run the program I still get the old name, no matter how
> can try. 
> Only workaround I got to solve this is to manually invoke hcitool name
> <bdaddress> to change the actual name in cache.

the name resolving operation is an expensive operation. It always
involves a low-level baseband page. So we try to avoid these kind of
operation whenever possible. This means that we return the cached name
all the time. However the cache will be automatically updated when you
actually connect to the remote device or if extended inquiry (a new
Bluetooth 2.1 feature) is used.

Regards

Marcel



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