#!/bin/bash
# Мониторинг CAN трафика с фильтрацией OBD2

INTERFACE=${1:-vcan0}

echo "=== CAN Monitor (OBD2) ==="
echo "Interface: $INTERFACE"
echo "Filtering: 7DF (requests) and 7E8 (responses)"
echo "Press Ctrl+C to stop"
echo ""

# Проверка candump
if ! command -v candump &> /dev/null; then
    echo "Error: candump not found. Install can-utils:"
    echo "  sudo apt install can-utils"
    exit 1
fi

# Мониторинг с фильтром
candump "$INTERFACE" | grep -E "(7DF|7E8)" | while read line; do
    timestamp=$(date +"%H:%M:%S.%3N")

    # Парсинг и форматирование
    if echo "$line" | grep -q "7DF"; then
        # Запрос
        pid=$(echo "$line" | awk '{print $3}' | cut -c5-6)
        echo "[$timestamp] REQUEST  -> PID: 0x$pid"
    elif echo "$line" | grep -q "7E8"; then
        # Ответ
        echo "[$timestamp] RESPONSE <- $line"
    fi
done