{"id":2518,"date":"2018-12-12T00:00:34","date_gmt":"2018-12-11T23:00:34","guid":{"rendered":"https:\/\/iot.fkainka.de\/?p=2518"},"modified":"2018-11-19T22:13:38","modified_gmt":"2018-11-19T21:13:38","slug":"day12-2018","status":"publish","type":"post","link":"https:\/\/iot.fkainka.de\/en\/day12-2018","title":{"rendered":"Day 12: MQTT Button"},"content":{"rendered":"

Today we will find again a button hidden behind the door of the Advent calendar. In our experiment\u00a0 today we will continue to cover the MQTT protocol, but this time in conjunction with Node-RED. We will also learn how two buttons can be evaluated simultaneously. The experiment today is structured as follows:<\/p>\n

\"Der<\/a>

Setup with two buttons<\/p><\/div>\n

So now we have two buttons that we can use. We activate the program for today. Then we import the Node-RED flow. You need to adapt it slightly by replacing [PID]<\/strong> in the topic with your personal MQTT ID. That\u2019s pretty easy if you use this trick:<\/p>\n

Copy the Node-RED flow into a text editor of your choice such as the Windows Editor for example. Select the Replace<\/strong> option (in Editor under Edit\/Replace<\/strong> ([Ctrl + H]). Enter [PID]<\/strong> into the Search for<\/strong> field and enter your personal ID in Replace with<\/strong>. Click Replace All<\/strong> and you have adjusted the flow and are now able to import and start it in Node-RED.\u00a0 But don\u2019t forget to disable previous flows.<\/p>\n

\"So<\/a>

Adjusting the flow using your personal ID is easy<\/p><\/div>\n