> For the complete documentation index, see [llms.txt](https://wiki.codeandcompile.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.codeandcompile.com/product-reviews/smart-devices/smart-weighing-indicator-controller/ind400-with-api.md).

# IND400 with API

### 📺 Video Tutorial

{% embed url="<https://www.youtube.com/watch?v=mq5Ddm6YlCI>" %}

## Smart Weighing with MQTT- IND400 in ACTION

The **Mettler Toledo IND400** is a **smart weighing indicator** designed for industrial applications. It supports modern protocols such as **MQTT, OPC UA, and Ethernet/IP**, making it **IIoT-ready** for digital factories.

### 🔑 What you’ll learn

* How to log in and authenticate with the IND400 using the **REST API**
* Sending GET/POST requests to read and write data
* Understanding the difference between **REST (request/response)** and **WebSocket (real-time streaming)** communication
* Setting up a WebSocket connection to continuously receive live weighing data
* Demo: Visualizing the data in **Node-RED**

### ⚙️ Example REST API Request

```http
POST http://192.168.0.58/v1.0.0/login
Content-Type: application/json

{
  "username": "002",
  "password": "yourpassword"
}
```

**Response (with access token):**

```json
{
  "accessToken": "eyJhbGciOiJIUzI1NiIs...",
  "expiresIn": 3600
}
```

***

### 🌐 WebSocket Example

**Global variables defined in POSTMAN:**

<figure><img src="/files/Op1FPB2PUMJVdDDQbKFJ" alt=""><figcaption></figcaption></figure>

**Connection URL:**

```
ws://192.168.0.58/v1.0.0/measurements/00000000-0401-0500-0000-00C516882663?stable=true&threshold=5&unit=kg&Authorization=Bearer YOURTOKEN
```

Once connected, the IND400 continuously streams real-time weight values.

<figure><img src="/files/eWaRjGPQIzmQSYomye3W" alt=""><figcaption></figcaption></figure>

***

### 📊 Applications

* Real-time monitoring of weighing processes
* Continuous data logging into **databases or historians**
* Feeding streaming data into **dashboards, MES, or cloud platforms**
* Seamless integration with **IIoT and Industry 4.0** architectures

## Key notes:

{% embed url="<https://www.canva.com/design/DAGxLbZ9Xc8/JmgxvzLDbsKvQ2nFcITY7g/view?utlId=hb50de73826&utm_campaign=designshare&utm_content=DAGxLbZ9Xc8&utm_medium=link2&utm_source=uniquelinks>" %}

## Node-RED Example Code

The Node-RED flow used in the video can be found in the GitHub repository mentioned below:

{% embed url="<https://github.com/Code-and-Compile/Mettler_Toledo_IND400_API>" %}

## ♥️ Work With Me

I regularly test **industrial automation and IIoT devices**. If you’d like me to **review your product** or showcase it in my courses and YouTube channel:

📧 Email: <rajvir@codeandcompile.com> or drop me a message on [LinkedIn](https://www.linkedin.com/in/singhrajvir/)