## BEST in IoT
[Miroslav "mirek" Biňas](https://bletvaska.github.io)
/ [**BEST Summer**](https://mpc-edu.sk/sk)
[](https://bletvaska.github.io)
> Internet of Things (IoT) means any smart device with ability to communicate via Internet.
> -- _by [iotbuzzer.com](https://iotbuzzer.com/what-is-iot-top-10-definitions-overview/)_
* **data producers** (sensors)
* **data consumers** (actuators)
## IoT is also about...
* hardware
* low power
* communication
* data (data science, (time series) db)
* updates (ota)
* security
## IoT is abou Additional Value
[](https://nodered.org)
## What is Node-RED I.?
> [Node-RED](https://nodered.org) is a **visual tool** for **wiring** the Internet of Things. (2016)
> **Flow-based programming** for the Internet of Things. (2017)
> **Low-code programming** for **event-driven applications**. (2019)
## What is Node-RED II.?
> [Node-RED](https://nodered.org) is a **programming tool** for **wiring** together hardware devices, APIs and online services in new and interesting ways. (2022)
> The easiest way to **collect**, **transform** and **visualize** real-time data. ([homepage](https://nodered.org))
## And besides that...
* open source (for free)
* platform independent ([nodejs](https://nodejs.org/))
* runs in browser
### "Traditional" Requirements for IoT Solution Development
* Low-level programming skills
* Hardware design expertise
* Understanding of electronics
* Knowledge of complex APIs for external service integration
* Experience with Time Series Databases (TSDBs)
* Knowledge of Data Analytics (DA) and Machine Learning (ML) for extracting insights from stored data
[Node-RED](https://nodered.org) handles the technical aspects of your solution, allowing you to focus on your workflow.
## Running Node-RED
1. start [Node-RED Docker Container](https://hub.docker.com/r/nodered/node-red)
```bash
$ docker container run --rm -it \
--publish 1880:1880 \
--volume node_red_data:/data \
--name nodered \
nodered/node-red
```
2. open browser at [`http://localhost:1880`](http://localhost:1880)
## What is FBP?
> **Flow-Based Programming** is a programming paradigm that defines applications as **networks** of "black box" processes, which exchange data across predefined **connections** by **message passing**, where the connections are specified **externally** to the processes. ([Wikipedia](https://en.wikipedia.org/wiki/Flow-based_programming))
## The Message
```json
{
"_msgid": "89cbb063.7f7a7",
"payload": "Hello world!",
"topic": "Greetings!"
}
```
## Meteo Servis
([inspiration](https://meteo.skola.sk/meteostanica/?id=22))
[](https://flows.nodered.org/node/node-red-contrib-web-worldmap)
[node-red-contrib-web-worldmap](https://flows.nodered.org/node/node-red-contrib-web-worldmap)
[](https://openweathermap.org)
* node: [node-red-node-openweathermap](https://flows.nodered.org/node/node-red-node-openweathermap)
* API key: `b85449dbf5d71ab387d93367c7f1b790`
* [current weather data in a machine-readable format](http://api.openweathermap.org/data/2.5/weather?units=metric&q=dolny%20kubin,sk&appid=b85449dbf5d71ab387d93367c7f1b790)
* HTTP protocol (REST API)
* JSON format
Notes:
* https://www.eclipse.org/community/eclipse_newsletter/2014/october/article2.php
### What else can Node-RED do?
* Build custom web applications
* Create custom REST APIs
* Develop custom dashboards
* Integrate with database systems
* Connect to external services (e.g., Twitter and many others)
* Develop custom nodes (natively in JavaScript or in Python)
* and much more
## Resources
* [Node-RED homepage](https://nodered.org)
* [resulting flow](resources/flow-meteoserice.json)
* [Node-RED channel on YouTube](https://www.youtube.com/channel/UCQaB8NXBEPod7Ab8PPCLLAA)