Drop lines that start with something other than the first sentence, e…

…ven when we do not have a group ID from before. Also start removing some of the logging from the initial deployment of the queue.

ais/uscg.py

@@ -99,7 +99,6 @@ def put(self, line, line_num=None):
       self.line_num += 1
 
     line = line.rstrip()
-    logging.info('put(%s, %s)', line, line_num)
     metadata_match = Parse(line)
     match = vdm.Parse(line)
 
@@ -130,7 +129,6 @@ def put(self, line, line_num=None):
     sentence_tot = int(match['sen_tot'])
 
     if sentence_tot == 1:
-      logging.info('Single line message')
       body = match['body']
       fill_bits = int(match['fill_bits'])
       try:
@@ -157,6 +155,11 @@ def put(self, line, line_num=None):
     if group_id not in self.groups:
       self.groups[group_id] = []
 
+    if not self.groups[group_id]:
+      if sentence_num != 1:
+        # Drop a partial AIS message.
+        return
+
     if sentence_num == 1:
       self.groups[group_id] = {
           'line_nums': [self.line_num],