FieldSim - Protocol Simulator
Industrial Protocol Simulator
$9.99 · Designed for iPad. Not verified for macOS.
Simulate 11 real industrial & IoT protocols on iPhone — MQTT, OPC UA, Modbus, BACnet, DNP3, EtherNet/IP, SNMP, AMQP, CoAP, HART-IP, LoRaWAN — with built-in test clients.
Fieldsim turns your iPhone into a real industrial and IoT protocol test bench — no extra hardware, no lab PC, no separate test tools.
Fieldsim isn't a mock-up. Every protocol is implemented against its real wire-level specification and verified against industry-standard reference clients and libraries. Real SCADA software, PLCs, and IoT gateways can connect to your iPhone and talk to it exactly as they would to a real field device.
Simulate 11 real protocols:
• MQTT — full broker with multi-topic publish/subscribe
• OPC UA — session/subscription server with a real address space
• Modbus TCP — coils, discrete inputs, holding & input registers
• BACnet/IP — Who-Is/I-Am discovery, ReadProperty/WriteProperty
• DNP3 — link/transport/application layers, Class 0 polling, Direct Operate
• EtherNet/IP — CIP explicit messaging (Get/Set_Attribute_Single)
• SNMP v2c — GET/GETNEXT/SET plus trap notifications
• AMQP 0-9-1 — full exchange/queue/consumer message broker
• CoAP — RFC 7252 with the Observe extension for live push updates
• HART-IP — session-managed Pass-Through with Universal Commands
• LoRaWAN — a real Network Server speaking the Semtech UDP protocol, with AES-128/CMAC frame encryption and authentication
Every protocol, both directions. Each simulator supports multiple simultaneous tags, points, or objects — build out a small virtual plant, not just one sensor. And every protocol also has a matching built-in client on the Client tab, so you can test your simulator (or any other real device on your network) without installing a second app or opening a terminal.
Built for real testing, not demos:
• Live, scrollable activity logs for every simulator and client
• Save and reuse connection presets per protocol — host, port, credentials, and protocol-specific settings
• Automatic detection of your iPhone's network address, so external clients always know where to connect
• Configurable value patterns (random, sine wave, ramp, static) for realistic simulated data
Who it's for:
Automation and controls engineers validating SCADA/HMI integrations, QA teams testing IoT gateways and protocol converters, product developers building device firmware against real-world protocols, and students or instructors learning how industrial protocols actually work on the wire.
Fieldsim is iOS-native, built entirely on Apple's Network framework — fast, lightweight, and works over Wi-Fi with any device on the same network.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Alexandr Garlock Development House LLC, 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.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Alexandr Garlock Development House LLC
- Size
- 2.6 MB
- Category
- Developer Tools
- Compatibility
Requires iOS 27.0 or later.
- iPhone
Requires iOS 27.0 or later. - iPad
Requires iPadOS 27.0 or later. - Mac
Requires macOS 27.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 27.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © AG Dev House LLC
