Can https_client example receive packet from server side without sending request in advance?

[Jeffery]

Hi Nordic team

Current https_client example at sdk connect

Connect to server --> send http request to server --> Wait response from server

Can we receive packet from server directly?

If yes, how can I modify https_client example?

Thanks.

Jeff

[Didrik Rokhaug]

Hi,

 

Can we receive packet from server directly?

 No, that is not how HTTP(S) works.

HTTP is a request-response protocol, so you will never get a HTTP response from a server without first sending an HTTP request.

However, the sample is simply sending and receiving data (formatted as a HTTP request or response) over TCP, so you can use the same code as an example how to send or receive data over TCP.

So, if you set up a server to send data automatically when a client connects, you can use the same code that the sample uses to receive the HTTP response, without first sending the request.

Best regards,

Didrik

[Jeffery]

Hi Didrik

In order to directly receive packet from server side, I referred to below link for TCP sample.

github.com/.../main.c

Another question. At MQTT_simple, we can use callback function (mqtt_evt_handler()) to receive server packet.

When packet received, the event "MQTT_EVT_PUBLISH" was triggered. to read the packet content.

So, can we claim callback function to receive server packet at TCP sample? How to do?

Jeff

.

[Didrik Rokhaug]

No, the TCP sample uses sockets directly. There are no libraries to register a callback to.

But you can make such a library yourself, with it's own read-loop or a poll function that must be called periodically.

[Jeffery]

Hi Didrik,  I don't know how to make a library to set callback interrupt. Do you have guide documentation?

[Didrik Rokhaug]

What exactly is it that you want?

All you really need is a loop that reads, or polls, on the socket, and when it gets some data, calls a function through a function pointer.

You can then put the loop in a separate thread, so that it doesn't block the rest of the program.