add tx delay to packet pad

grc/foo_packet_pad.xml

@@ -5,7 +5,7 @@
 	<key>foo_packet_pad</key>
 	<category>Foo</category>
 	<import>import foo</import>
-	<make>foo.packet_pad($debug, $pad_front, $pad_tail)</make>
+	<make>foo.packet_pad($debug, $delay, $delay_sec, $pad_front, $pad_tail)</make>
 
 	<param>
 		<name>Debug</name>
@@ -22,6 +22,29 @@
 			<key>False</key>
 		</option>
 	</param>
+
+	<param>
+		<name>Delay</name>
+		<key>delay</key>
+		<value>False</value>
+		<type>bool</type>
+
+		<option>
+			<name>Enable</name>
+			<key>True</key>
+		</option>
+		<option>
+			<name>Disable</name>
+			<key>False</key>
+		</option>
+	</param>
+
+	<param>
+		<name>Delay Sec</name>
+		<key>delay_sec</key>
+		<value>0.001</value>
+		<type>real</type>
+	</param>
 	
 	<param>
 		<name>Pad Front</name>
@@ -39,6 +62,7 @@
 
         <check>$pad_front >= 0</check>
         <check>$pad_tail >= 0</check>
+        <check>$delay_sec > 0</check>
 
 	<sink>
 		<name>in</name>