[Unit]
Description=Appmainprog
After=appmainprog.service network-online.target

[Service]
Type=simple
ExecStart=/bin/bash /home/avs/SampleApp/setup_avs.sh >& ttyS0
StandardOutput=tty
StandardError=tty
Restart=always
RestartSec=5s

[Install]
WantedBy=multi-user.target