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* as React from 'react'\n /* @jsx mdx */\nimport { mdx } from '@mdx-js/react';\n/* @jsxRuntime classic */\n/* @jsx mdx */\nimport { EuiSpacer } from '@elastic/eui';\nimport PrimaryBoxInfo from 'components/Advanced_User/All_Node-RED_Tutorials/PrimaryBox';\nimport NavButtons from 'components/Advanced_User/NavButtons';\nimport BreadCrumbs from 'components/Layout/BreadCrumbs';\nimport SEOHelmet from 'components/Layout/SEOHelmet';\nimport TimeLine from 'components/Products/CommentList/MqttIFTTTList';\nexport const _frontmatter = {\n \"title\": \"Node-RED Event Timeline for your MQTT Camera\",\n \"path\": \"/Advanced_User/Node-RED_Alarm_Event_Timeline/\",\n \"dateChanged\": \"2020-06-27\",\n \"author\": \"Mike Polinowski\",\n \"excerpt\": \"Node-RED is a programming tool for wiring together hardware devices like your INSTAR IP camera and APIs & online services. It provides a browser-based editor that makes it easy to wire together flows using the wide range of nodes providing inter-connectivity between your cameras REST API and IoT protocols like MQTT (Message Queuing Telemetry Transport) Compatible with the camera models IN-6001 HD, IN-6012 HD, IN-6014 HD, IN-5905 HD, IN-5907 HD, IN-7011 HD, IN-8003 Full HD, IN-8015 Full HD, IN-9008 Full HD, IN-9020 Full HD.\",\n \"image\": \"./AU_SearchThumb_Node-RED.png\",\n \"social\": \"/images/Search/AU_SearchThumb_Node-RED.webp\",\n \"toc\": \"/images/Search/TOC_Icons/Wiki_Tiles_Advanced_NodeRED_white.webp\",\n \"chapter\": \"Advanced User\",\n \"category\": \"smarthome\",\n \"type\": \"Node-RED\"\n};\nconst layoutProps = {\n _frontmatter\n};\nconst MDXLayout = \"wrapper\";\nexport default function MDXContent({\n components,\n ...props\n}) {\n return \n\n\n\n\n \n \n \n \n \n \n

{`Node-RED Event Timeline for your MQTT Camera`}

\n \n \n \n \n

{`Use Case`}

\n

{`You are sitting in front of screen having to keep an eye on what is happening somewhere with your MQTT camera. You want to be able to see the live video from your camera, get a snapshot whenever the motion detection is triggered and have a event timeline so you can scroll back a few events and see what you have missed while fetching a coffee.`}

\n

\n

{`Used Nodes`}

\n \n

{`Node-RED Flow`}

\n

{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}{`\n `}

\n \n

{`Walkthrough`}

\n
    \n
  1. {`Create a database in AlaSQL (I called mine `}{`AlarmSnapDB`}{`). This node is triggered with every restart of Node-RED to make sure that it is ready for use.`}
    2. \n
  2. {`Fetch the live video (I am using ONVIF you can use `}{`another way to embed the live video`}{`)`}
    3. \n
  3. {`Now I need an MQTT IN node that is listening to my cameras alarmserver `}{`instar/local/status/alarm/triggered`}{` (see `}{`this article`}{` for an explanation how those topics work)`}
    4. \n
  4. {`The alarm server node triggers Node-RED to fetch a snapshot from my camera, base64 it and stores it into the database. Additionally, I display the snapshot on my dashboard. I added a trigger node that makes sure that there is only one image per alarm event - you might want to remove that or adjust the `}{`8 second`}{` cool down that I found works perfectly for my use case.`}
    5. \n
  5. {`The alarm server node also triggers the `}{`Timeline`}{` to register an event.`}
    6. \n
  6. {`Node-RED receive the timestamp of an event when you click on it in the timeline dashboard widget. I use this timestamp to search for the corresponding event in my database and display the corresponding image on my dashboard. `}{`Note`}{` that the timestamp format used inside the database and the one used by the timeline widget is different. To be able to compare them I am using the `}{`Moment.js`}{` - you will have to configure this one according to your system timezone settings!`}
    7. \n
\n

{`Node-RED Dashboard`}

\n

{`\n `}{`\n `}