Finding Raspberry Pi on network (connected to the same WLAN).

find_pi.sh

#!/bin/bash

# Script to find Raspberry Pi on local network
# Uses network scanning and MAC address detection

echo "🔍 Finding Raspberry Pi on network..."
echo ""

# Step 1: Detect local IP and network range
echo "[1/4] Detecting local network..."
LOCAL_IP=$(ipconfig getifaddr en0 2>/dev/null || ipconfig getifaddr en1 2>/dev/null)

if [ -z "$LOCAL_IP" ]; then
    echo "❌ Error: Could not detect local IP address"
    exit 1
fi

# Extract network prefix (e.g., 192.168.0 from 192.168.0.50)
NETWORK_PREFIX=$(echo $LOCAL_IP | cut -d'.' -f1-3)
echo "   Network: ${NETWORK_PREFIX}.0/24"
echo ""

# Step 2: Scan network for active devices
echo "[2/4] Scanning network for devices..."
if ! command -v nmap &> /dev/null; then
    echo "   Installing nmap..."
    brew install nmap
fi

nmap -sn ${NETWORK_PREFIX}.0/24 > /dev/null 2>&1
echo "   Scan complete"
echo ""

# Step 3: Look for Raspberry Pi MAC addresses
echo "[3/4] Searching for Raspberry Pi devices..."
# Common Raspberry Pi MAC prefixes:
# b8:27:eb - Raspberry Pi Foundation (older models)
# dc:a6:32 - Raspberry Pi Foundation
# e4:5f:01 - Raspberry Pi Foundation
# d8:3a:dd - Raspberry Pi Foundation (Pi 5)
# 28:cd:c1 - Raspberry Pi Foundation

PI_IPS=$(arp -a | grep -iE "b8:27:eb|dc:a6:32|e4:5f:01|d8:3a:dd|28:cd:c1" | grep -oE "([0-9]{1,3}\.){3}[0-9]{1,3}" | sort -u)

if [ -z "$PI_IPS" ]; then
    echo "   ❌ No Raspberry Pi devices found by MAC address"
    echo ""
    echo "Troubleshooting:"
    echo "  - Make sure the Pi is powered on"
    echo "  - Verify WiFi/Ethernet is connected"
    echo "  - Check your router's connected devices list"
    exit 1
fi

echo "   Found Raspberry Pi device(s):"
for ip in $PI_IPS; do
    MAC=$(arp -a | grep "$ip" | grep -oE "([0-9a-f]{1,2}:){5}[0-9a-f]{1,2}")
    echo "     • $ip (MAC: $MAC)"
done
echo ""

# Step 4: Test SSH connection to each found Pi
echo "[4/4] Testing SSH connections..."
for ip in $PI_IPS; do
    echo "   Testing $ip..."
    if timeout 3 ssh -o ConnectTimeout=2 -o StrictHostKeyChecking=no -o BatchMode=yes adrielmartins@$ip "echo success" &>/dev/null; then
        echo ""
        echo "✅ Successfully connected to Raspberry Pi!"
        echo ""
        echo "   IP Address: $ip"
        echo "   Username:   adrielmartins"
        echo ""
        echo "Connect with:"
        echo "   ssh adrielmartins@$ip"
        echo ""
        exit 0
    elif timeout 3 ssh -o ConnectTimeout=2 -o StrictHostKeyChecking=no adrielmartins@$ip "echo success" 2>&1 | grep -q "Permission denied"; then
        echo ""
        echo "✅ Found Raspberry Pi at $ip"
        echo "   (Password authentication required)"
        echo ""
        echo "Connect with:"
        echo "   ssh adrielmartins@$ip"
        echo ""
        exit 0
    fi
done

echo ""
echo "⚠️  Found Raspberry Pi device(s) but SSH is not responding"
echo ""
echo "Possible issues:"
echo "  - SSH service may not be started yet (wait a few minutes)"
echo "  - SSH may not be enabled in Ubuntu Server"
echo "  - Try connecting manually: ssh adrielmartins@$(echo $PI_IPS | awk '{print $1}')"
echo ""