Module bandwidth 

System-wide bandwidth estimation.

Reads network interface byte counters and computes RX/TX rates.

• Linux: parses /proc/net/dev
• macOS: parses netstat -ib

The first sample has no delta, so the rate is None.

Structs

BandwidthRate

Bandwidth measurement: bytes per second for RX and TX.

BandwidthTracker

Tracks bandwidth by sampling byte counters.

Functions

format_rate

Format bytes/sec as human-readable string (e.g. “1.2 MB/s”).