QUECTEL EC21 GSM module how to receive data wihtout sending a query?

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I can communicate with a web server over HTTP functions like get and post with no problem.

The algoritm works like this;

  • I send a query with get
  • Than start to listen
  • If any data received, I read it.

I need to if I didnt send any request to server, how could I receive the data?

Because server starts the communication, and after the beginning I'm directing it.( send to server, and listen the response ...) The problem is server can send a request to start communication once a day, or once a week, or more.

In addition there may be many client such as me...

And if server wants to start communication, I have to reply quickly. ( just in seconds...)

How should I setup the algoritm?

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