# MQTT SimX - Broker & IoT Tools — MQTT Client & RTU Simulator

> MQTT Client & RTU Simulator (iPhone/iPad app by AH SEN TEW.)

- Source: https://appshunter.io/ios/app/mqtt-simx-broker-and-iot-tools/id6782346462 (this page in markdown: same URL + `.md`)
- Developer: [AH SEN TEW](https://appshunter.io/developer/6774454068)
- Category: Developer Tools, Utilities
- Price: $6.99
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English
- Released: 2026-06-24
- Data updated: 2026-06-30
- User reviews in markdown: https://appshunter.io/ios/app/mqtt-simx-broker-and-iot-tools/id6782346462/reviews.md

## What is MQTT SimX?

MQTT SimX is a portable MQTT client and RTU simulator for engineers, developers, and IoT hobbyists. Connect to any MQTT broker over TCP or TLS and test your topics, payloads, and devices right from your iPhone or iPad.

SUBSCRIBE & MONITOR
• Subscribe with single- and multi-level wildcards (+ and #)
• Choose QoS 0, 1, or 2
• Live message log with automatic JSON pretty-printing
• See topic, QoS, and retain flag on every message

PUBLISH
• Compose multiple topic/payload rows
• Per-message QoS and retain
• Send one row or publish them all at once

RTU SIMULATOR
• Simulate a Remote Terminal Unit with digital inputs/outputs and analog inputs
• Auto-publish telemetry on a set interval, with optional ±noise
• Respond to remote command and config messages, replying with an ACK
• Telemetry formats: JSON, Text, KeyValue, XML, Raw

PROTOCOLS & SECURITY
• MQTT 3.1.1 and MQTT 5.0
• TLS connections
• Username / password authentication
• Clean-session control and built-in broker presets

BUILT-IN GUIDE
• Field-level help on QoS, retain, wildcards, and more
• An in-app MQTT guide with topic, payload, and RTU command examples

PRIVACY
MQTT SimX collects no personal data. Your connection settings stay on your device, and the app connects only to the brokers you configure.

MQTT SimX is a one-time purchase — no subscriptions, no ads, no tracking.


## Version history (last 1 release)

### 1.0 — 2026-06-24

No release notes.

## More apps by AH SEN TEW

- [SliceStackX - Perfect Tower](https://appshunter.io/ios/app/slicestackx-perfect-tower/id6774604956)
- [DailyThreeX - Habit Tracker](https://appshunter.io/ios/app/dailythreex-habit-tracker/id6774933282)
- [StorageXSense - Cleaner](https://appshunter.io/ios/app/storagexsense-cleaner/id6775413700)

All apps by AH SEN TEW: https://appshunter.io/developer/6774454068

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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 2026-06-30.*