Setup pf-ui to NOT echo characters to the tty device

docs/slideshow.md

@@ -17,6 +17,14 @@ DL_URL=$(curl https://git.kemonine.info/api/v1/repos/PiFrame/piframe-go/releases
 wget $DL_URL -O /usr/local/bin/pf-ui
 chmod a+x /usr/local/bin/pf-ui
 
+# Setup wrapper script for pf-ui so no chracters are echo'd to the tty
+cat > /usr/local/bin/pf-ui.sh <<EOF
+#!/bin/bash
+/usr/bin/stty -echo
+/usr/local/bin/pf-ui
+EOF
+chmod a+x /usr/local/bin/pf-ui.sh
+
 # Setup systemd service for UI
 cat > /etc/systemd/system/pf-ui.service <<EOF
 [Unit]
@@ -25,7 +33,7 @@ After=getty.target
 
 [Service]
 User=root
-ExecStart=/usr/local/bin/pf-ui
+ExecStart=/usr/local/bin/pf-ui.sh
 Restart=always
 TTYPath=/dev/tty1
 StandardInput=tty