[Unit]
Description=WallpaperChanger Service
#Requires=multi-user.target local-fs.target
#After=multi-user.target local-fs.target
ConditionPathExists=/home/lucas/Documents/Dokumente/Projekte/Server/scripts/raspberry/python/mqtt_client.py
ConditionPathExists=/home/lucas/433venv/bin/python 
[Service]
ExecStart=/home/lucas/433venv/bin/python /home/lucas/Documents/Dokumente/Projekte/Server/scripts/raspberry/python/mqtt_client.py
[Install]
WantedBy=multi-user.target