I am try implement C2DM in Android. I am able to get Registration code after registration with C2DM Server. But when I send message from 3rd party server, it displays message "message sent" and error code 200 in Log, which means 3rd party server have successfully send the message. BuT my problem is that, I am not able to receive message in device.
This blog http://www.tomasmalmsten.com/tag/c2dm/ is excellent for getting android c2dm up and running.