use the resume call before pumping data from a reader

csdr/module/__init__.py

@@ -120,6 +120,8 @@ class PopenModule(AutoStartModule, metaclass=ABCMeta):
 
     def start(self):
         self.process = Popen(self.getCommand(), stdin=PIPE, stdout=PIPE)
+        # resume in case the reader has been stop()ed before
+        self.reader.resume()
         Thread(target=self.pump(self.reader.read, self.process.stdin.write)).start()
         Thread(target=self.pump(partial(self.process.stdout.read, 1024), self.writer.write)).start()
 

owrx/aprs/module.py

@@ -49,6 +49,8 @@ class DirewolfModule(AutoStartModule, DirewolfConfigSubscriber):
             stdin=PIPE,
         )
 
+        # resume in case the reader has been stop()ed before
+        self.reader.resume()
         threading.Thread(target=self.pump(self.reader.read, self.process.stdin.write)).start()
 
         delay = 0.5