MQTT SimX - Broker & IoT Tools

MQTT Client & RTU Simulator

$6.99

Connect to any MQTT broker, subscribe and publish across QoS levels, and simulate an RTU device — MQTT 3.1.1 & 5.0, right from your iPhone and iPad. 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.

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The developer, AH SEN TEW, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

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    Information

    Seller
    AH SEN TEW
    Size
    1.6 MB
    Category
    Developer Tools
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    Languages
    English
    Age Rating
    4+
    Copyright
    © 2026 Justin Tew
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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