In this subchapter we will link out Node-RED based Fog setup to an existing cloud application using HTTPS, REST and JSON.

First we will generate a Node-RED flow that produces appropriately formatted JSON objects and then we will send these fragments to the cloud application.

First we will need to generate data to send to the cloud application.

Task: Based on the “Fog Scenario” subchapter write a function block that behaves like in the video below. The node should output a number that increments whenever a message with the payload “pressed” is received.

Next we will want a node that formats the data in a format suitable for the cloud application.

The following code, when placed in a function block, does just that:

var obj = {'value' : msg.payload};
var out = {'payload' : obj};

return out;

The output is of the format {'value': 1}, ready to be sent to the cloud application.

The video below shows you how to setup Node-RED to send an HTTP POST request to the https://nota-cloud/api/log/nota-1 endpoint whenever a button press event is received.

Task: Add an HTTP request block to your flow. Set the endpoint address to the one corresponding to you device name.