# FieldBus Toolkit

> FieldBus Toolkit (iPhone/iPad app by DONGSOO LEE.)

- Source: https://appshunter.io/ios/app/fieldbus-toolkit/id6758210279 (this page in markdown: same URL + `.md`)
- Developer: [DONGSOO LEE](https://appshunter.io/developer/1868670088)
- Category: Utilities, Developer Tools
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 13.0 · 29 MB
- Languages: American English, German (Germany), Japanese, Korean, Chinese (Simplified, China), Chinese (Traditional, Taiwan)
- Released: 2026-01-26
- Data updated: 2026-07-29
- User reviews in markdown: https://appshunter.io/ios/app/fieldbus-toolkit/id6758210279/reviews.md

## What is FieldBus Toolkit?

FieldBus Toolkit is the essential utility for embedded engineers and PLC programmers.
Debug Modbus TCP, MQTT, HTTP, and socket communications directly from your mobile device.

[Key Features]
1. Multi-Protocol Support
- Modbus TCP Client
- MQTT Client (Publish/Subscribe)
- HTTP REST Client (GET, POST, PUT, DELETE)
- TCP/UDP Client & Server (Echo/Broadcast)

2. Data Visualization
- Send and receive data in ASCII or HEX format.
- Real-time communication logs.

3. Efficiency Tools
- Save frequently used commands as Macros for quick access.
- One-touch data transmission.

4. Developer Friendly
- Perfect for testing Arduino, ESP32, Raspberry Pi, and industrial PLCs.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |



## Version history (last 5 releases)

### 1.0.4 — 2026-07-27

Updated age rating response regarding social media

### 1.0.3 — 2026-05-05

[What's New]
- Added License Information: You can now view the open-source license information within the app.

### 1.0.2 — 2026-04-29

[What's New]
- Added support for privacy regulations (GDPR, CCPA).
- Ad system (AdMob) update and optimization.

### 1.0.1 — 2026-02-04

What's New

Auto-Save Last Inputs Network information fields now automatically save your last input values. Pick up right where you left off without re-typing.

UI Improvement We moved the ad position to the bottom of the screen to ensure a clearer view of your data and tools.

### 1.0 — 2026-01-26

No release notes.

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## More apps by DONGSOO LEE

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All apps by DONGSOO LEE: https://appshunter.io/developer/1868670088

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-29.*