Yes I am just doing this on a small site of less than 10 users that won't expand much if at all. So are there thoughts of how to keep the notifications setup I have and trigger the push notification code for the app? I can take the same concepts now and switch to messages if I must, just not sure how the app interfaces. Thanks!

Talking about large(r) sites I agree completely. And actually I made Bryce aware of that issue in my second post already. But this was meant to be running on a very small family site, only - so I don't see it'll turn out to be a problem.

Just my thoughts are here, foreach ($users as $key => $value) { ... suppose you have 1Million users and you running loop to add notification , this will take long time. Also the notifications are created by posting user.... so it will make the posting user wait until loop finished.

These type of things should be run on sever end via console/ or a cron jobs.

bryce, messages in ossn will trigger a push notification to the mobile app, though notifications will not. since the mobile app is not open source we can't do much about that. maybe you want to dispatch a message to your users (perhaps from an admin) as a workaround.

last thing Z Man, not sure if you are familiar with the app code but as part of this I was hoping that by triggering a notification it would also send a push notification to the user that is logged into the app on their phone but it appears this doesnt seem to work as of now. I have a few things to try but I will let you know if anything pans out. Im interested in your feedback. Im guessing I will have to do something via the api to trigger a push notification through that component.

yay! All done and it works great, thanks Z Man!

Great Bryce, you're almost done.
The only part still missing is the viewing hook. :)
So have a look into the com file of the OssnWall component and copy

ossn_add_hook('notification:view', 'like:post', 'ossn_likes_post_notifiation');

and the corresponding function to your component.

Rename it to something like

ossn_add_hook('notification:view', 'post:created', 'com_post_notifier_post_view_notification');

and click that notification globe again:

All that 's left to do is adding that placeholder to your language file like

'ossn:notifications:post:created' => '%s created a post',

and finding a meaningful icon.

It's getting late here - good night.

sweet, thank you. I am getting notifications showing in the counter over the globe notification icon but when I click the notification globe or go to the notifications page there is no notification. Is this because the subjectguid isnt a valid subject since I just stubbed in the objectguid to test with? If so, is there a list of these subjects so that I can add to it or hard code to use one of the existing ones?

Correct: $params is an array, no object, so you have to fetch the value as

$params['poster_guid']

In case you're not sure, you may use the ossn_dump() function like

error_log('MY PARMS: ' . ossn_dump($params));

Anyway - and this time it's me to say sorry - this was not the reason for getting no notification records. You actually need that notification ADD hook. Without (see line 59 of OssnNotification->classes) the add method returns false. So add that hook to your component like

ossn_add_hook('notification:add', 'post:created', 'com_post_notifier_post_add_notification');

and the corresponding function like

function com_post_notifier_post_add_notification($hook, $type, $return, $params) {
        // error_log('NEW NOTI: ' . ossn_dump($params));
        $return = $params;
        $return['owner_guid'] = $params['notification_owner'];
        return $return;
}

If you verify the error log you'll find that basically everything is already in place, but the class code in line 62 expects a value in owner_guid, not notification_owner. That's why I copied it.
(Just made a pull request because the logic sequence appears strange to me)

Having applied all this you should see some new records in your ossn_notification table now.

Hmm, so now I am getting guids all the way across but the notification add method is not creating a notification for some reason using the below code. Any thoughts ?

function post_notifications() {
    ossn_register_callback("wall", "post:created", "notificationHandler");
}

function notificationHandler($callback, $type, $params) {
    $notifications = new OssnNotifications;
    $user = new OssnUser;
    $users = $user->getSiteUsers(['page_limit' => false]);

    foreach ($users as $key => $value) {
        // send the notification to all users except the posting user
        if ($value->guid != $params['poster_guid']) {
            error_log("TYPE: " . $type);
            error_log("POSTER GUID: " . $params['poster_guid']);
            error_log("OBJECT GUID: " . $params['object_guid']);
            error_log("VALUE GUID: " . $value->guid);
            $notifications->add($type, $params['poster_guid'], $params['object_guid'], $params['object_guid'], $value->guid);
        }
    }
}