added script to receive commands via ssh

shell.sh

@@ -0,0 +1,28 @@
+#!/bin/bash --
+
+# shold be started from a separate account
+# access via ssh:
+#    cat .ssh/authorized_keys
+#    command="/home/automation/chch-power/shell.sh",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty ssh-rsa AAAA...
+
+status() {
+	STATUS="$(cat /tmp/status)"
+	if [ -z "$STATUS" ]; then
+		STATUS="geschlossen"
+	fi
+	echo "$STATUS"
+}
+
+read COMMAND
+case "$COMMAND" in
+	status)
+		status
+		;;
+	*)
+		echo "ERROR; available commands:" >&2
+		echo "status" >&2
+		exit 1
+		;;
+esac
+
+exit 0