I get this now with a previous version:
Raspberry output stream::
● UAVcast.service - UAVcast Drone Software
Loaded: loaded (/lib/systemd/system/UAVcast.service; enabled; vendor preset: enabled)
Active: inactive (dead) since Thu 2018-06-14 21:23:01 UTC; 1min 51s ago
Process: 1915 ExecStart=/bin/bash DroneStart.sh start (code=exited, status=0/SUCCESS)
Jun 14 21:22:55 raspberrypi sudo[2001]: pam_unix(sudo:session): session opened for user root by (uid=0)
Jun 14 21:22:55 raspberrypi sudo[2001]: pam_unix(sudo:session): session closed for user root
Jun 14 21:23:00 raspberrypi bash[1915]: Could`t start gStreamer
Jun 14 21:23:00 raspberrypi sudo[2039]: root : TTY=unknown ; PWD=/home/pi/UAVcast ; USER=root ; COMMAND=/home/pi/UAVcast/script/./cmavnode.sh
Jun 14 21:23:00 raspberrypi sudo[2039]: pam_unix(sudo:session): session opened for user root by (uid=0)
Jun 14 21:23:00 raspberrypi bash[1915]: 14/06/2018 21:23:00
Jun 14 21:23:01 raspberrypi bash[1915]: Serial streaming script started
Jun 14 21:23:01 raspberrypi bash[1915]: If you see this message, then Network was successfully loaded.
Jun 14 21:23:01 raspberrypi systemd[1]: Started UAVcast Drone Software.
Jun 14 21:23:01 raspberrypi sudo[2039]: pam_unix(sudo:session): session closed for user root
Where is the issue?