idle_suspend_minecraft

#!/bin/sh

PASSWORD="<yourrconpassword"
# Minimum delay in minutes before suspending > 1
MIN_DELAY=15

previously_empty=0

echo "Monitoring Minecraft server idle state..."

while true; do
    interval="$((MIN_DELAY * 60))"
    if [ "$interval" -lt 60 ]; then
        interval=60
    fi
    sleep "$interval"
    current_date=$(date -u +"%Y-%m-%d-%H-%M-%S-UTC")
    reply=$(mcrcon -p "$PASSWORD" -c list)
    player_count=$(echo "$reply" | grep -oE '[0-9]+' | head -1)
    if [ "$player_count" -eq 0 ]; then
        echo "$current_date Server is idle"
        if [ "$previously_empty" -eq 0 ]; then
            previously_empty=1
            echo "Suspending server in $MIN_DELAY minutes"
            mcrcon -p "$PASSWORD" "say Suspending server in $MIN_DELAY minutes"
        else
            if ss -t | grep -q 'ssh'; then
                echo "Suspension delayed by $MIN_DELAY minutes"
                mcrcon -p "$PASSWORD" "say Suspension delayed by $MIN_DELAY minutes"
                continue
            fi
            previously_empty=0
            echo "Suspending server..." 
            mcrcon -p "$PASSWORD" "say Suspending server..."
            if ! systemctl suspend; then
                echo "Could not suspend system"
                mcrcon -p "$PASSWORD" "say Could not suspend system"
            else
                current_date=$(date -u +"%Y-%m-%d-%H-%M-%S-UTC")
                echo "Server resumed from suspend"
            fi
        fi
    else
        echo "$current_date Players online: $player_count"
        previously_empty=0
    fi
done