From f63155b22d83e9007094da31b5f1898f995f03f7 Mon Sep 17 00:00:00 2001
From: Harald Pfeiffer <coding@lirion.de>
Date: Wed, 6 Oct 2021 09:09:01 +0200
Subject: +sit

---
 bin/sit | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100755 bin/sit

diff --git a/bin/sit b/bin/sit
new file mode 100755
index 0000000..eab8955
--- /dev/null
+++ b/bin/sit
@@ -0,0 +1,34 @@
+#!/usr/bin/env sh
+
+# a simple beep implementation for the "Hinweiston nach 1 TR 110-1, Kap. 8.8", also called "Sonderinformationston" or - shorthand - SIT.
+
+function zuhuelf {
+	printf "USAGE: %b [ -l ]\\n\\n" "$(basename "$0")"
+	printf "DESCRIPTION: Hinweiston nach 1 TR 110-1, Kap. 8.8 / SonderInformationsTon\\n\\n"
+	(
+		printf -- "-h:;This help\\n"
+		printf -- "-l:;Loop the tone. Delays between loops are also implemented according to\\n"
+		printf " ;1 TR 110-1 Kap. 8.8.\\n"
+	)|column -ts\;
+	printf "\\n"
+}
+
+LOOPADOOP=0
+while getopts :hl SHOPT;do
+	case "$SHOPT" in
+		"h") zuhuelf;exit 0;;
+		"l") LOOPADOOP=1;;
+	esac
+done
+
+function sittone {
+	# chain the tones to avoid kernel delays between tones
+	beep -l 330 -f 950 -n -l 330 -f 1400 -n -l 330 -f 1800
+}
+
+if [ "$LOOPADOOP" -eq 1 ];then
+	# TR 110-1 specifies a delay of 1000ms between repetitions
+	while true; do sittone; sleep 1; done
+else
+	sittone
+fi
-- 
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