# Enable IP forwarding
sudo sysctl \
    -w                      # Write (or set) the value of a kernel parameter 
    net.ipv4.ip_forward=1   # Temporarily enable IP forwarding to forward network packets from one network interface to another

# Configure NAT for the bridge
sudo iptables \
    -t nat                  # Specify the nat table used for Network Address Translation 
    -A POSTROUTING          # Append this rule to the POSTROUTING chain, which alters packets as they are about to leave the network interface 
    -o wlp0s20f3            # Apply this rule to packets leaving the wlp0s20f3 interface (Wi-Fi interface) 
    -j MASQUERADE           # Use the MASQUERADE target to change the source IP address to the IP address of the outgoing interface, enabling multiple devices on a private network to share a single public IP address

# Configure xbnet and bridge interfaces
sudo xbnet \
    /dev/ttyUSB0 \          # Port where the XBee device is connected 
    tun                     # Create a TUN (network tunnel) interface for routing IP packets

sudo ip addr \
    add 192.168.100.1/24 \  # Assign the IP address 192.168.100.1 with a subnet mask of 255.255.255.0 
    dev xbnet0              # to the xbnet0 interface

sudo ip link \
    set dev xbnet0 up       # Activate the xbnet0 interface

sudo brctl \
    addbr br0               # Create a new bridge interface named br0

sudo brctl \
    addif br0 wlp0s20f3     # Add the Wi-Fi interface wlp0s20f3 to the bridge br0

sudo brctl \
    addif br0 xbnet0        # Add the xbnet0 interface to the bridge br0

sudo ip link \
    set dev br0 up          # Activate the bridge interface br0

sudo ip addr \
    flush dev wlp0s20f3     # Remove any IP addresses assigned to the wlp0s20f3 interface

sudo ip addr \
    add 192.168.7.122/24 \  # Assign the IP address 192.168.7.122 with a subnet mask of 255.255.255.0 
    dev br0                 # to the bridge interface br0

sudo ip link \
    set dev wlp0s20f3 up    # Reactivate the wlp0s20f3 interface