From 819810e52abc33737ddd401f798787cd0058e915 Mon Sep 17 00:00:00 2001
From: David Lechner <david@pybricks.com>
Date: Sat, 23 Jan 2021 13:36:01 -0600
Subject: [PATCH] add workaround for bluez notification issue

https://crbug.com/1170085
---
 src/sagas/lwp3-bootloader-ble.ts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/sagas/lwp3-bootloader-ble.ts b/src/sagas/lwp3-bootloader-ble.ts
index 0fbcbe60..8fe9fbc7 100644
--- a/src/sagas/lwp3-bootloader-ble.ts
+++ b/src/sagas/lwp3-bootloader-ble.ts
@@ -132,6 +132,14 @@ function* connect(_action: BootloaderConnectionAction): Generator {
     });
 
     try {
+        try {
+            yield call([characteristic, 'stopNotifications']);
+        } catch {
+            // HACK: Chromium on Linux (BlueZ) will not receive notifications
+            // if a device disconnects while notifications are enabled and then
+            // reconnects. So we have to call stopNotifications() first to get
+            // back to a known state. https://crbug.com/1170085
+        }
         yield call([characteristic, 'startNotifications']);
     } catch (err) {
         notificationChannel.close();