By default, the bridge is started in SOCKS mode. In case your IRC client does
not support SOCKS proxies, you can start the bridge for a specific network
instead by overriding the ExecStart= directive:

sudo mkdir /etc/systemd/system/robustirc-bridge.service.d
cat <<'EOT' | sudo tee /etc/systemd/system/robustirc-bridge.service.d/exec.conf
[Service]
ExecStart=
ExecStart=/usr/bin/robustirc-bridge -network=robustirc.net
EOT
sudo systemctl daemon-reload
sudo systemctl restart robustirc-bridge.service