Android Question How to force other devices to refresh their display?

[toby]

I have some devices
1. running the same B4A app
2. in the same wifi network
3. Physically nearby, within 5 meters radius
4. periodically, using a timer with 1 minute interval, update their screen display by retrieving data from the remote mysql database to pick up the changes made by other users.

This works fine most of the time. However, from time to time, when a user makes some particular change, I want this change to be reflected immediately, instead of waiting for the timer event, on other users' device.

Could someone kindly give me some guidance, please.

TIA

 

[DonManfred]

send a pushnotification from your server to all devices to update their display. Do an update of display on receiving the message.

 

[toby]

send a pushnotification from your server to all devices to update their display. Do an update of display on receiving the message.

As far as I understand, users have to manually refresh it after receiving the notification.

I prefer that the update is done automatically. Any other suggestions, please.

 

[DonManfred]

I prefer that the update is done automatically. Any other suggestions, please.

Code it! It is up to you what happens when a notification arrives. You can do the update then... by code...
I don´t see a reason why the user have to do something.

 

[toby]

I've found the Bluetooth chat example which serves my need; devices have direct connection with nearby ones.

 

[josejad]

Maybe you can do the same with MQTT

 

[toby]

Maybe you can do the same with MQTT

Actually MQTT is the right solution due to its 1-to-many connection feature while bluetooth only allows 1-on-1 connection.

 

[josejad]

Notice you can do the same with Firebase Push Notification, as DonManfred said

 

[toby]

Firebase Push Notification is a little overkill for my need and I have to learn it first; in the past I tried out local mqtt which keeps things simple and local.