ethr: init at 1.0.0-unstable-2025-12-10

Ethr is a comprehensive network performance measurement tool that operates in three distinct modes:

*   **Server Mode** (`-s`)
    *   Runs Ethr as a server listener to accept incoming connections for performance tests.
    *   Supports binding to specific IPs and ports.
    *   Includes a Text UI (`-ui`) option and an option to exit after handling a single client connection (similar to iPerf3 behavior) for precise synchronization.

*   **Client Mode** (`-c <server>`)
    *   Connects to an Ethr server to perform comprehensive performance benchmarks.
    *   **Supported Protocols:** TCP, UDP, HTTP, HTTPS, and ICMP.
    *   **Measurement Capabilities:**
        *   **Bandwidth:** Measure throughput with options for throttling (`-b`), buffer length (`-l`), and reverse direction (`-r`).
        *   **Connections/s:** Benchmark connection establishment rates.
        *   **Packets/s:** Measure packet processing rates.
        *   **Latency & Loss:** Detailed analysis of latency, packet loss, and jitter.
    *   **Diagnostics:** Supports TraceRoute and MyTraceRoute (MTR).
    *   Supports multi-threaded parallel sessions (`-n`).

*   **External Mode** (`-x <destination>`)
    *   Allows Ethr to test against non-Ethr endpoints (standard URLs or Host:Port combinations).
    *   **Use Cases:** Testing connectivity against public websites or standard services (e.g., `www.microsoft.com:443`).
    *   **Supported Tests:**
        *   **TCP/ICMP:** Connection establishment rates and connectivity checks.
        *   **Ping:** Loss and latency measurements.
        *   **TraceRoute:** Standard and MTR-style path analysis.

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