TCP and TLS passthrough
Bidirectional TCP relay with TLS forwarded as opaque bytes; the proxy does not terminate or decrypt TLS.
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WINDOWS PROJECT
Network Simulator
A portable-first Windows TCP proxy for testing network conditions with physical Android POS terminals, including TLS passthrough.
Version 1.0Windows
NS✦
APPSFEATURE · WINDOWS
PROJECT OVERVIEW
Reproduce network issues. Test with control.
Network Simulator is a portable-first Windows tool that places a configurable TCP proxy between physical Android POS terminals and an upstream server. It helps developers investigate connectivity and response-handling behaviour under controlled network conditions.
Network fault controls
Apply directional latency, jitter, bandwidth limits and request/response forwarding pauses.
ISO8583 DE 3 rules
For plain TCP profiles, configure Processing Code rules to leave traffic unchanged, block matching requests or alter the complete response frame.
Profile-based dashboard
Manage multiple endpoints, listener ports, profile import/export, connection state and byte counters from a local HTML dashboard.
APP SCREENSHOTS
See it in action.
VERSION 1.0
Built for practical POS testing.
The portable Windows EXE can run without a separate Python or Flask installation. Download availability is managed through the project repository's Actions build artifacts; no direct public installer link is advertised on this page.
Included capabilities
- Independent TCP endpoint profiles
- Directional latency, jitter and bandwidth throttling
- Request/response forwarding pause and active socket abort
- Metadata-only event log and local dashboard
- JSON profile import/export
Important limitations
- TLS payload remains encrypted and opaque
- DE 3 rules apply to plain TCP only
- Not a packet-loss, SYN-blackhole or Wi-Fi outage emulator
- Corporate firewall and network controls may require IT approval
GET THE PROJECT
Explore source, releases and build artifacts.
Open the repository to review documentation and available workflow artifacts.