HFlows Simulator

The professional Modbus & MQTT flow-based simulator for engineers and developers. Design, test, and validate industrial communication protocols with an intuitive visual interface.

Powerful Features for Protocol Testing

Flow-Based Visual Editor

Design complex communication scenarios with an intuitive node-based interface. Connect devices, set parameters, and visualize data flow in real-time.

  • • Drag-and-drop node creation
  • • Real-time connection validation
  • • Visual debugging tools
  • • Custom node templates

Complete Protocol Support

Comprehensive implementation of Modbus and MQTT protocols with all standard features and extensions.

  • • Modbus RTU/TCP/ASCII
  • • All Modbus function codes
  • • MQTT 3.1.1 and 5.0
  • • QoS 0, 1, 2 support
  • • Custom protocol extensions

Advanced Scenario Management

Create, save, and replay complex test scenarios with timing control and conditional logic.

  • • Time-based triggers
  • • Conditional responses
  • • Random value generation
  • • Scenario templates
  • • Batch testing support

Data Analysis & Logging

Comprehensive logging and analysis tools for protocol debugging and optimization.

  • • Packet capture and decode
  • • Timing analysis
  • • Export to CSV/JSON
  • • Performance metrics

Scripting & Automation

Extend functionality with scripting support for complex automation scenarios.

  • • Python scripting
  • • Command-line interface
  • • Batch processing

Cross-Platform Native

Native performance on all major operating systems with consistent experience.

  • • Core built with Ada 2022
  • • Native Qt6 interface
  • • Hardware acceleration
  • • Low resource usage
  • • Portable workflows

Perfect For Your Industry

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Industrial Automation

Test PLC communication, SCADA systems, and industrial IoT devices before deployment.

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IoT Development

Simulate IoT devices and gateways for testing edge computing and cloud connectivity.

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Protocol Bridging

Develop and test protocol converters between legacy and modern systems.

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Education & Training

Teach industrial protocols with visual, interactive simulations in a safe environment.

Common Applications

  • Device integration testing before field deployment
  • MQTT broker load testing and QoS validation
  • Modbus slave device simulation for master testing
  • Protocol compliance verification
  • Digital twin development for industrial systems
  • Network stress testing and fault injection
  • Training simulations for field technicians
  • Proof of concept for system integrations