INNER CODE UNIT · Python

monitor

Chanchaldhiman/CANviz · backend/canviz/cli.py:276

def monitor(
    interface: InterfaceOpt = "gs_usb",
    channel: ChannelOpt = "",
    index: IndexOpt = 0,
    bitrate: BitrateOpt = 500_000,
    dbc: DbcOpt = None,
    j1939: Annotated[bool, typer.Option("--j1939", help="Enable J1939 decode - adds PGN and SA columns. Use 250 kbps for trucks/agriculture.")] = False,
    refresh_rate: Annotated[float, typer.Option("--refresh-rate", help="Table refresh rate in Hz")] = 4.0,
) -> None:
    """
    Live CAN frame monitor in the terminal.

    Shows a Rich table that refreshes at 4 Hz. Each row is one unique CAN message ID.
    Columns: ID · Name (if DBC loaded) · DLC · Data (hex) · Count · Rate (fps) · Last Seen
    With --j1939: adds PGN and SA (Source Address) columns for J1939 traffic.

    Data column is colour-coded on change:
      Green  - byte sum increased since last frame

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