in order to publish a message using the PubNub JSON/JSONP REST API with HTTP GET, the following format is demanded: http://pubsub.pubnub.com /publish /pub-key /sub-key /signature /channel /callback /message So, my question is, does the message field require a specific format. I'm working with an Arduino Yun and i'm using HttpClient library.
The publish message should be JSON formatted then URI encoded. Here is an example string: http://pubsub.pubnub.com/publish/demo/demo/0/hello_world/0/%22Hello%20World%22
BTW, I have worked with the Arduino Yun in the past and have a short sketch implementing the HttpClient. It only has subscribe, but it supports JSON parsing! Should be a big help for you: