fixed error in handling of duplicate MGM heads

python/tmc_classes.py

@@ -917,7 +917,7 @@ class tmc_message:
                 self.ci=int(tmc_x&0x7) #continuity index
                 self.data_arr=BitArray()
                 self.mgm_list=[]
-                self.length=0
+                #self.length=0# attribute error is catched and signals incomplete mgm
             self.location=tmc_location(tmc_z,tableobj)
             #self.event=int(tmc_y&0x7ff) #Y10-Y0
             self.event=tmc_event(int(tmc_y&0x7ff),self.tableobj) #Y10-Y0

python/tmc_parser.py

@@ -183,11 +183,12 @@ class tmc_parser(gr.sync_block):
                     ci=int(tmc_x&0x7)
                     tmc_msg=tmc_message(PI,psn,ltn,tmc_x,tmc_y,tmc_z,datetime_received,self)
                     self.dataLock.acquire(1)
-                    self.tmc_messages.add(tmc_msg)
+                    message_is_repeat=self.tmc_messages.add(tmc_msg)
                     self.dataLock.release(1)
                     #if  self.RDS_data[PI]["internals"]["unfinished_TMC"].has_key(ci):
                         #print("overwriting parital message")
-                    self.unfinished_messages[PI][ci]={"msg":tmc_msg,"time":time.time()}
+                    if not message_is_repeat:#save unfinished message only once (dont overwrite collected additional groups)
+                        self.unfinished_messages[PI][ci]={"msg":tmc_msg,"time":time.time()}
                 else:
                     ci=int(tmc_x&0x7)
                     if self.unfinished_messages[PI].has_key(ci):