Sample that shows how to use the Push Messaging API in an app.
How to install on your local machine:
You can either install this from the Chrome Web Store at https://chrome.google.com/webstore/detail/push-messaging-sample-cli/bafimiidcfafikaonocgmmcpbbhfjjik or put this into a directory on your machine, and go to chrome://extensions, click on the "Load unpacked extension..." button, and choose the directory where you downloaded this sample.
That will install the sample app, you can launch it from the new tab page. Choose the apps view at the bottom if it is not already selected, and click on the Push Messaging Sample app. It will launch an app which registers for and receives push messages. Now you can use this to test recieving messages from the push messaging server you write. You can also test it with a curl script which sends push messages.
Most of the relevant code for this sample is in background.js. We've commented it heavily, to explain what is going on and what you need to do to write your client code.
Here is a sample curl script - you will need to replace the clientId, clientSecret, and refreshToken with the ones you get following the instructions below, and replace the channel ID with the channelID shown in the UI once you launch the sample app.
accesstoken=(curl -s https://accounts.google.com/o/oauth2/token -d "client_secret=<your client secret here>&grant_type=refresh_token&refresh_token=<your refresh token here>&client_id=<your client id here>" | grep "access_token" | awk -F\" '{print $4}')
curl -s -H "Authorization: Bearer $accesstoken" -H "Content-Type: application/json" https://www.googleapis.com/gcm_for_chrome/v1/messages -d "{'channelId': '', 'subchannelId': '0', 'payload': 'Hello push messaging!'}"
