update_transmission_peer_port.sh

#!/bin/bash
# updates the peer port of locally running transmission v4 daemon with the port output from ProtonVPN's NAT-PNP
# update the location of natpmp_client.py and double check your wireguard peer IP

# Get public port number using natpmp_client.py
public_port=$(python /path/to/py-natpmp/natpmp/natpmp_client.py -g 10.2.0.1 0 0 | awk -F 'public port ' '{print $2}'| cut -d',' -f1)

# Get current peer listening port in Transmission
current_port=$(transmission-remote -si | awk -F 'Listenport: ' '{print $2}' | cut -d' ' -f1 | grep -v -e '^$')

# Compare the two ports
if [ "$public_port" -ne "$current_port" ]; then
    # Update peer listening port in Transmission
    transmission-remote -p "$public_port"
    echo "Peer listening port updated to $public_port"
else
    echo "Peer listening port is already set to $current_port"
fi