Android App Improvement - wake lock

We have a working app. We have two problems 1. submission of data to server (it works but the current intervals is not correct ie data is not captured at the correct time on server. App is supposed to submit information every 15 seconds but it ends up submitting a couple of records in a few seconds 2. sleep wake problem By default the app sends information to server but it does not send information when the screen is inactive even though the phone is running in the background. Since this is a test project we do not have a large budget. What will be provided: We can provide the Java files but the selected person will have to sign an nda and he or she is not able to use the files for other projects. He or she will need to look at the source code and inform us where to make the change. Thank you. Best regards Ashar