car_ui triggers two notifications (one empty) when using group parameter

[syphernl]

Home Assistant Android app version(s): 2023.7.5

Android version(s): 13

Device model(s): OnePlus 11

Home Assistant version: 2023.7.2

Last working Home Assistant release (if known): -

Description of problem, include YAML if issue is related to notifications:

When sending notifications with car_ui: true the message gets sent to the AA Display.
After showing the message, a new empty popup shows up (and triggers the same notification sound).

service: notify.iq_notify
data:
  title: 🔓 Alarm
  message: Alarm Turned Off ({{changed_by}})
  data:
    tag: alarm-disarmed
    mode: just_arrived
    notification_icon: mdi:shield-lock-open
    channel: Security - Alarm Status
    ttl: 0
    priority: high
    importance: high
    group: Security Alarm
    car_ui: true

Companion App Logs:

Screenshot or video of problem:

Additional information:

[dshokouhi]

mode: just_arrived

Just a FYI this does nothing for the Android app. Not even documented on the site.

What car/device is this issue occurring on?

[syphernl]

mode: just_arrived

Just a FYI this does nothing for the Android app. Not even documented on the site.

What car/device is this issue occurring on?

This is an argument for the iq_notify service. On my phone I never had any duplicated / empty content messages.

Car is a Mazda 2 with Mzd Connect.

[dshokouhi]

ok can you try without the group parameter? It looks like the car may not support that properly. Testing without group does not show a duplicate and empty notification on my end.

[syphernl]

ok can you try without the group parameter? It looks like the car may not support that properly. Testing without group does not show a duplicate and empty notification on my end.

Certainly, I will give it a go! Where you able to reproduce this issue with setting the group parameter?

[dshokouhi]

Yes I am able to reproduce.

      message: Testing car UI notification
      data:
        ttl: 0
        priority: high
        channel: car
        car_ui: true
        group: test
        notification_icon: mdi:car

excuse the dust lol

[garysargentpersonal]

I have also reproduced this issue. With "group" parameter you get an additional empty notification. Without that, you don't.

[jpelgrom]

So it looks like Android Auto is actually showing the summary notification apps are supposed to send and is normally displayed when collapsed, and it's empty because HA doesn't set the 'compat' summary. See for example a group of two where I manually set the text for the summary notification to the group name 'Alarm':

I'm guessing this has something to do with the Android Auto implementation. Looking around I can only find messaging notifications with multiple 'items', which is not the same as a group. Messages from different persons actually show up individually while they would be grouped on a phone.

As it is technically the same notification as on your phone, we can't remove anything without impact elsewhere. The only 'fix' I see is just not marking the summary notification as available on Auto, so you only get the individual group notifications. What do you all think?

[dshokouhi]

I think that should be fine, this way users don't need to modify their notifications for the car and can use the same one sent to the phone.