Implemented burst framenumber filter. Issue #100
diff --git a/grc/flow_control/gsm_burst_fnr_filter.xml b/grc/flow_control/gsm_burst_fnr_filter.xml
new file mode 100644
index 0000000..d09b6e6
--- /dev/null
+++ b/grc/flow_control/gsm_burst_fnr_filter.xml
@@ -0,0 +1,42 @@
+<?xml version="1.0"?>
+<block>
+ <name>Burst framenumber filter</name>
+ <key>gsm_burst_fnr_filter</key>
+ <import>import grgsm</import>
+ <make>grgsm.burst_fnr_filter($mode, $fnr)</make>
+
+ <param>
+ <name>Mode</name>
+ <key>mode</key>
+ <type>enum</type>
+ <option>
+ <name>Less or equal</name>
+ <key>grgsm.FILTER_LESS_OR_EQUAL</key>
+ </option>
+ <option>
+ <name>Greater or equal</name>
+ <key>grgsm.FILTER_GREATER_OR_EQUAL</key>
+ </option>
+ </param>
+ <param>
+ <name>Framenumber</name>
+ <key>fnr</key>
+ <value>1500123</value>
+ <type>int</type>
+ </param>
+
+ <sink>
+ <name>in</name>
+ <type>message</type>
+ </sink>
+
+ <source>
+ <name>out</name>
+ <type>message</type>
+ <optional>1</optional>
+ </source>
+
+ <doc>
+Burst framenumber filter forwards only blocks with a framenumber satisfying the configured mode, i.e. if mode is "Less or equal", then only bursts with a smaller or equal framenumber are forwarded.
+ </doc>
+</block>