Set up a mesh network

setup-mesh.sh

#!/bin/bash
set -e

if [ -z "$1" ]; then
  echo "Usage: sudo ./setup-mesh.sh 192.168.77.X"
  exit 1
fi

MESH_IP="$1"
SERVICE_PATH="/etc/systemd/system/mesh-startup.service"

echo "[INFO] Setting up mesh with IP $MESH_IP"

sleep 5

# Bring wlan0 down and into IBSS mode
echo "[INFO] Configuring wlan0 for mesh"
ip link set wlan0 down || true
iw wlan0 set type ibss
ip link set wlan0 up
iw wlan0 ibss join mesh-net 2412

# Load BATMAN module and attach
echo "[INFO] Loading BATMAN-adv"
modprobe batman-adv
batctl if add wlan0 || true
ip link set up dev bat0

# Assign IP
echo "[INFO] Assigning $MESH_IP to bat0"
ip addr add "$MESH_IP"/24 dev bat0 || true

# Disable conflicting services
echo "[INFO] Disabling conflicting services"
systemctl disable --now wpa_supplicant.service || true
systemctl disable --now NetworkManager.service || true

# Write systemd service with correct IP
echo "[INFO] Creating systemd mesh-startup.service"
cat <<EOF > "$SERVICE_PATH"
[Unit]
Description=Start mesh networking on boot
After=network.target

[Service]
Type=oneshot
ExecStart=/usr/local/bin/setup-mesh.sh $MESH_IP
RemainAfterExit=true

[Install]
WantedBy=multi-user.target
EOF

chmod 644 "$SERVICE_PATH"
systemctl daemon-reexec
systemctl enable mesh-startup.service

echo "[INFO] Setup complete. Mesh will start automatically on boot."