how to send random local notification message in react-native? - react-native

Question

I have an app that needs to send out notification/s everyday with random messages to user depending on how many notification they want (up to 5 notifs per day) and between what time they want (for example notifications will fire only between 6:00am - 9:00am everyday).
To elaborate I'm building a functionality with an idea to send out random inspirational messages that I'm pulling from a hardcoded array variable or json file.
Currently I'm using this package: https://github.com/zo0r/react-native-push-notification to create local notification.
I tried the idea of setting a function that returns a string for the message parameter of localNotificationSchedule, but when I do this, instead of using a regular string, it's not showing the notification.
PushNotification.localNotificationSchedule({
id : '1',
userInfo : { id: userId },
message : () => {
return Math.random().toString(36).replace(/[^a-z]+/g, '').substr(0, 5); //trying to return random string every time notification fires.
},
date : moment(Date.now()).add(2, 'seconds').toDate(),
repeatType : 'day',
});
I considered using other approach such as react-native headless JS but it's for android only.
Also considered using https://www.npmjs.com/package/react-native-background-fetch. But I have a complex interval for notifications. For example, the user might set the notification to run from 6:00am - 6:30am everyday and set to fire 5 notifications. In this interval, notifications will run every 6 mins.
But react-native-background-fetch' minimal interval is only 15 minutes.
I know that this can be done by using a push notification instead, but with that, user will need a connection in order for them to receive a notification, which is not ideal for this case.
Iv'e seen this from an Ios app so I know this is possible to achieve.

Answer 1

As per the dev, you can try calling PushNotification.localNotificationSchedule multiple times.
What I've done is this:
const messages = [{text:'',time:0}...];
messages.map(message=>{
PushNotification.localNotificationSchedule({
//... You can use all the options from localNotifications
channelId: "my-channel",
message: message.text, // (required)
date: new Date(Date.now() + (60 + message.time) * 1000), // in 60 secs
});
})
to show a message from the messages array separated by 5 seconds.