diff --git a/ctabus/internal/notification.py b/ctabus/internal/notification.py
old mode 100644
new mode 100755
index a1a1861..d014e10
--- a/ctabus/internal/notification.py
+++ b/ctabus/internal/notification.py
@@ -1,68 +1,91 @@
 from concurrent.futures import ThreadPoolExecutor
-from io import StringIO
 import os
-
 import subprocess
+import uuid
+
+from ctabus.internal.config import state_dir
 
 EXECUTOR = ThreadPoolExecutor()
 NOTIFICATION_EXE = "termux-notification"
 
 
-class NotificationManager:
-    NEXT_ID = 0
+class NotificationException(Exception):
+    def __init__(self, message):
+        self.message = message
+
 
-    def __init__(self, workdir="."):
+class NotificationManager:
+    def __init__(self, workdir=state_dir):
         self.workdir = workdir
-        self.id = NotificationManager.NEXT_ID
-        NotificationManager.NEXT_ID += 1
+        self.id = uuid.uuid4().hex
+
+        self.title = None
         self.message = None
+
         self.listener_future = None
         self.listen_fifo_path = None
-        self.title = None
+        self._posting = False
+        self._poster = None
+        self._live = True
+
+    def on_done(self):
+        pass
 
     def set_title(self, title):
         self.title = title
-        self.show()
 
     def say(self, message):
         self.message = message
-        if self.listener_future is None:
-            self.setup_listener()
         self.show()
 
+    def _cleanup(self):
+        self.on_done()
+        self._live = False
+        os.remove(self.listen_fifo_path)
+
     def _listen(self):
-        stop_cond = str(id)
-        with open(self.listen_fifo_path) as fifo:
-            if fifo.read(len(stop_cond)) == stop_cond:
-                self._cleanup()
 
-    def setup_listener(self):
+        out = None
+        while out != self.id:
+            with open(self.listen_fifo_path) as fifo:
+                out = fifo.read(len(self.id)).rstrip()
+        self._cleanup()
+
+    def _setup_listener(self):
         self.listen_fifo_path = os.path.abspath(
-            os.path.join(self.workdir, "{}.{}".format(self.__class__, self.id))
+            os.path.join(self.workdir, "{}.{}".format(self.__class__.__name__, self.id))
         )
         os.mkfifo(self.listen_fifo_path)
         self.listener_future = EXECUTOR.submit(self._listen)
 
-    def cleanup(self):
-        os.remove(self.listen_fifo_path)
-
     def show(self):
-        cmdline = [NOTIFICATION_EXE]
-        if self.message is None:
-            message = "Placeholder"
-        else:
-            message = self.message
-        if self.title is None:
-            title = "Placeholder"
-        else:
-            title = self.title
-
-        cmdline += ["--title", self.title]
-        cmdline += [
+        if not self._live:
+            raise NotificationException(
+                "Attempted show on cleaned-up NotificationManager"
+            )
+        if self.listener_future is None:
+            self._setup_listener()
+
+        if self._posting:
+            self._poster.wait()
+            self._posting = False
+
+        cmdline = [
+            NOTIFICATION_EXE,
+            "--id",
+            self.id,
             "--on-delete",
             "echo {} > {}".format(self.id, self.listen_fifo_path),
         ]
-        subprocess.Popen(cmdline, stdin=StringIO(message))
+
+        message = self.message if self.message is not None else "Placeholder"
+        title = self.title if self.title is not None else "Placeholder"
+
+        cmdline += ["--title", title]
+        with subprocess.Popen(cmdline, stdin=subprocess.PIPE, text=True) as proc:
+            proc.communicate(input=message)
+        self._poster = proc
+        self._posting = True
 
 
 if __name__ == "__main__":