Removed last parameter from socket_pdu in order to make grgsm_decode more compatible with GNU Radio 3.7.3
diff --git a/apps/grgsm_decode b/apps/grgsm_decode
index 099d680..393aff6 100755
--- a/apps/grgsm_decode
+++ b/apps/grgsm_decode
@@ -112,7 +112,7 @@
 
         self.cch_decoder = grgsm.control_channels_decoder()
 
-        self.socket_pdu = blocks.socket_pdu("UDP_CLIENT", "127.0.0.1", "4729", 10000, False)
+        self.socket_pdu = blocks.socket_pdu("UDP_CLIENT", "127.0.0.1", "4729", 10000)
         if self.verbose:
             self.message_printer = grgsm.message_printer(pmt.intern(""), True, True, False)