Download and install the Go App Engine SDK:

• https://cloud.google.com/appengine/downloads

For the remaining steps, I will assume that you have it in your path, and you have Go set up for normal development.

Download this package:

goapp get github.com/russross/letmein-server

Customize it. Create a new App Engine project and note the ID that you use:

• https://appengine.google.com/

Copy that project ID into app.yaml on the line beginning with application: (replace "letmein-app" with your ID).

Create a web client OAuth ID for your project according to the Endpoints tutorail instructions. Create another one for your Android client. Put these both in a file called config.json like this:

{
    "OAuthClientID": "your-client-id-here.apps.googleusercontent.com",
    "OAuthAndroidID": "your-android-id-here.apps.googleusercontent.com"
}

Deploy your app:

goapp deploy

You may be prompted for your Google username and password.

Next, create the Android API stubbs. First generate the discovery API document:

curl -s https://your-app-id.appspot.com/_ah/api/discovery/v1/apis/letmein/v1/rest > letmein.rest.discovery

Inspect it to make sure it looks okay (it should have information about the API calls). Then use it to generate the Android API classes:

endpointscfg.py gen_client_lib java -bs gradle letmein.rest.discovery

This will create a file called letmein.rest.zip with the Endpoints API classes. Add this to your Android project according to the Endpoints Android tutorial and use it to connect your app to your server.