How can we check the uninstalled status? about javapns HOT 5 CLOSED

'If a provider attempts to deliver a push notification to an application, but 
the application no longer exists on 
the device, the device reports that fact to Apple Push Notification Service. 
This situation often happens when 
the user has uninstalled the application. If a device reports failed-delivery 
attempts for an application, APNs 
needs some way to inform the provider so that it can refrain from sending 
notifications to that device. Doing 
this reduces unnecessary message overhead and improves overall system 
performance.

For this purpose Apple Push Notification Service includes a feedback service 
that APNs continually updates 
with a per-application list of devices for which there were failed-delivery 
attempts. The devices are identified 
by device tokens encoded in binary format. Providers should periodically query 
the feedback service to get the 
list of device tokens for their applications, each of which is identified by 
its topic. Then, after verifying that the 
application hasn’t recently been re-registered on the identified devices, a 
provider should stop sending 
notifications to these devices.

Access to the feedback service takes place through a binary interface similar 
to that used for sending push 
notifications. You access the production feedback service via 
feedback.push.apple.com, port 2196; you access 
the sandbox feedback service via feedback.sandbox.push.apple.com, port 2196. As 
with the binary interface 
for push notifications, you should use TLS (or SSL) to establish a secured 
communications channel. The SSL 
certificate required for these connections is the same one that is provisioned 
for sending notifications. To 
establish a trusted provider identity, you should present this certificate to 
APNs at connection time using 
peer-to-peer authentication.

Once you are connected, transmission begins immediately; you do not need to 
send any command to APNs. 
Begin reading the stream written by the feedback service until there is no more 
data to read. The received data 
is in tuples having the following format:

time, token length, token id'

This would indicate to me that there is no way to discern between failed 
connectivity issue and a removed app.

very clear!

Thanks

FYI, There was a company called Pinch Media, that recently became Flurry: 
Analytics that would track app installs.

http://www.flurry.com/product/analytics/index.html

Now for the down side... Apple's new policy doesn't allow any analytics so that 
won't work... but that would 
indicate that Apple is gearing up provide their own version.

Bill