Two concurrent sockets: web server / client

[Swak953]

Is there any possibility the Arduino can act as a web server and post data when needed? I've been looking for a working solution in this forum, but the ones I find are working only once (posting data to my server for the first time, but then connection failed).

I'd appreciate any help!

[stoutfiles]

An easy way is to go to a PHP page with your data in the URL using PHP GET.

www.yourwebsite.com/datacollect.php?data_var=your_data

[Swak953]

Sorry, maybe I didn't express myself clearly... That's what I'm already doing, but what I'm trying to do is receive http request from a client (acting as a web server) and send http request to another one (acting as a client).

Code: [Select]


//Global variables
GSMServer server(80);
GSMClient client;

void setup(){
server.begin();
GSMClient client = server.available();
  if (client)
  {}
}

//Another function (runs at loop)
client.connect(ext_server, 8080);
 

I tried to create another client (client2) to make client.connect(ext_server, 8080). Have I to stop the server and stop the client (release socket) before trying to make the http request? Has anybody do it or is there another way to?

[stoutfiles]

Don't believe two simultaneous connections is possible.  Assuming you're passing data from client1 to client2, I would just store the data in a variable (or file on a SD card), drop connection, reestablish new connection, and pass it that way.  I suggest using shutdown() after every connection and waiting at least 5 seconds before starting a new one.

[Swak953]

What I really need is to make HTTP requests to a server (posting data) every time I programm, and listening to HTTP requests when nothing has to be sent. This means the board is continuosly listening to a web client and, when the timer expires, sends readings to a server.

[stoutfiles]

Would need a lot more information to justify why you'd want to continuously listen, and not use an Ethernet and/or Wifi shield for this task.