I set up the "subscriptions" module and have set it so that all members of the page have access to a number of panels. One allows them to set the frequency of emails, one allows them to pick and choose which nodes to subscribe to. The node choice works well, and so does choosing a 'digest' choice for the emails.
The issue I am having is that the notification emails are sent out at what seems to be the first cron event after the new content has been added, which can be a long time if I don't visit the site, but at the same time too soon if someone has chosen a longer interval.
I am currently the only one 'testing' the site so have two users set up with subscriptions. One I have set for once every 3 hours and one 'once per day'.
As Cron was only running when either entering the site or running manually, I also chose to download the module "Ultimate Cron" which I thought would run Cron more often (i have it set to 30 minutes), but it does not seem to be doing this either, although messages are being sent to both users, even if the one asking for a message no more than once per day has already received one in that 24 hour period.
If I don't visit the site, both now get messages at least, but not at the correct intervals.
One of the main organisers of our organisation says she will not join the forum and member site unless there is a way to get notifications once a day, or once a week, and she is trying to push to use Yahoo forums, but I have everything set up the way I like it and so if I can fix this one issue I can then open it up to members of our small society.
Here are some screenshots of my SUBSCRIPTIONS settings. I have tried to show what I believe is relevant. I have disabled the other subscription modules which I had tried in the past. I DO have some messaging modules though (please see "messaging module" image)
UPDATE: Tested again and still receiving messages on each cron run rather than at the correct intervals. As mentioned below in a comment, it is likely an issue with the Subscriptions module.
If anyone knows how I may be able to fix settings, or even adjust line code to figure this out then I would be very grateful.
Had already tried notifications etc. but Subscriptions is perfect for what I need (if it worked).
Thank you all.