Android Question Listener for httpjop

Start here: [B4X] OkHttpUtils2 with Wait For

Thanks for reply
My point is somthing like websocket but over host as a third party
Ex.
I have php to append string to txt file on my host
From device 1 a add string to this txt file on host like msg
,, in device 2 i want to get thes new string and do some events
My solution is use timer every 5 minutes to download string from this txt file by httpjop
And run events
Its work good
But i ask if there library or class to auto listener fire when string in txt file was changed?

Deptor said:

But i ask if there library or class to auto listener fire when string in txt file was changed?

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You can use Firebase Messaging to do so (Push Messages). Browse the forum. You'll need a Google Developer Account. When App x changes a value, the php script sends a push message to the other device (like WhatsApp does). See the examples in the forum.