Implemented dummy burst filter. Issue #100
diff --git a/grc/flow_control/gsm_dummy_burst_filter.xml b/grc/flow_control/gsm_dummy_burst_filter.xml
new file mode 100644
index 0000000..046abbf
--- /dev/null
+++ b/grc/flow_control/gsm_dummy_burst_filter.xml
@@ -0,0 +1,24 @@
+<?xml version="1.0"?>
+<block>
+ <name>Dummy burst filter</name>
+ <key>gsm_dummy_burst_filter</key>
+ <import>import grgsm</import>
+ <make>grgsm.dummy_burst_filter()</make>
+
+ <sink>
+ <name>in</name>
+ <type>message</type>
+ </sink>
+
+ <source>
+ <name>out</name>
+ <type>message</type>
+ <optional>1</optional>
+ </source>
+
+ <doc>
+This block filters dummy bursts.
+
+For more information on dummy bursts, see GSM 05.02.
+ </doc>
+</block>