unable to have the scream service working on startup

[Thomson-Skelington]

Hi,
I'm using scream on a raspberry pi running raspbian
I setup a systemctl service for scream in /etc/systemd/system/scream.service

[Unit]
Description=Scream Receiver
After=pulseaudio.service network-online.target
Wants=pulseaudio.service
#Requires=pulseaudio.service

[Service]
User=pi
Type=simple
ExecStart=/home/pi/scream/Receivers/unix/build/scream -u -p 4011 -v

[Install]
WantedBy=default.target

While logged in ssh if I do sudo systemctl start scream it works fine
But with sudo systemctl enable scream it fails to start on boot.
systemctl status scream shows this

● scream.service - Scream Receiver
   Loaded: loaded (/etc/systemd/system/scream.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Mon 2021-09-20 13:59:06 BST; 41s ago
  Process: 300 ExecStart=/home/pi/scream/Receivers/unix/build/scream -u -p 4011 -v (code=exited, status=1/FAILURE)
 Main PID: 300 (code=exited, status=1/FAILURE)

Sep 20 13:59:04 raspberrypi systemd[1]: Started Scream Receiver.
Sep 20 13:59:05 raspberrypi scream[300]: Using Pulseaudio output
Sep 20 13:59:05 raspberrypi scream[300]: Unable to connect to PulseAudio. Connection refused
Sep 20 13:59:06 raspberrypi systemd[1]: scream.service: Main process exited, code=exited, status=1/FAILURE
Sep 20 13:59:06 raspberrypi systemd[1]: scream.service: Failed with result 'exit-code'.

[duncanthrax]

Could be a race condition. Pulseaudio may be too slow starting up.
Try ExecStartPre=/bin/sleep 5 in the [service] section.

[Thomson-Skelington]

Could be a race condition. Pulseaudio may be too slow starting up.
Try ExecStartPre=/bin/sleep 5 in the [service] section.

I just tried and I have the same error
Will try with a higher value
EDIT: it works with a value of 30, I will try reducing to the minimum
EDIT2: I managed to make it work using a sleep 3 and a Restart=always and RestartSec=1 (I might not need the sleep anymore but Pulseaudio needs some time to start anyway)

[Thomson-Skelington]

The final service setup

[Unit]
Description=Scream Receiver
After=pulseaudio.service network-online.target
Wants=pulseaudio.service

[Service]
User=pi
Type=simple
ExecStartPre=/bin/sleep 3
ExecStart=/home/pi/scream/Receivers/unix/build/scream -u -p 4011 -v
Restart=always
RestartSec=1

[Install]
WantedBy=default.target