my pi reads data from sensors and I want it to send the data to my pc, and whenever the pi reads a new value, it must send it to the pc automatically and save it in a text file and appends it to it. Can anyone suggest a good way to do that ? Note : I'm using C++ to read the data. And my pc's operating system is ubuntu Thank you all

  • Are the PC and Pi networked?
    – joan
    Commented Mar 4, 2017 at 22:12
  • The best way would be networking, which means some kind of IP based client server application a la DriverUpdate's answer -- although personally I would skip the use of HTTP unless using a web app adds some further advantage to you.
    – goldilocks
    Commented Mar 5, 2017 at 8:43

2 Answers 2


How often does this need to be updated, is it more than twice a minute or so, or is it long term logging(Once an hour or day, maybe)? If the latter, one way to do it would be to create a PHP-script running on your Ubuntu machine, taking http requests(GET or POST), formatting and saving the received data. the request could look something like this:

"http://address.of.Ubuntu.machine/?Sensor1=Data1&Sensor2=Data2 HTTP/1.1"

The php script would take that information, easily read and put however you like and neatly format it and save it. I haven't bothered to write the formatting, sorry, but this php running on apache or something should do the trick(Not tested) $req_dump = print_r( $_REQUEST, true ); $fp = file_put_contents( 'request.log', $req_dump ); In PHP, the $_REQUEST variable is basically a dump of the http request coming into the server... You should probably make the filename into a timestamp.

The C++ on the RasPi could look something like the selected best answer here: https://stackoverflow.com/questions/26761058/how-to-send-http-request-and-retrieve-a-json-response-c-boost, especially the part

#include <boost/asio.hpp>
#include <iostream>

int main() {
    boost::system::error_code ec;
    using namespace boost::asio;

    // what we need
    io_service svc;
    ip::tcp::socket sock(svc);
    sock.connect({ {}, 8087 }); // http://localhost:8087 for testing

    // send request
    std::string request("GET /newGame?name=david HTTP/1.1\r\n\r\n");

, where the "name=david" is replaced with all of your sensor information, separated with &s.

The only disadvantage I can tell with this method is: -A web PHP-compatible web-server has to be running on the Ubuntu PC

Feel free to comment suggestions if anyone finds something terribly wrong with my thinking or code...(I am Norwegian, 100% english is NOT guaranteed)

  • "The only disadvantage I can tell with this method is: -A web PHP-compatible web-server has to be running on the Ubuntu PC" -> It's not hard to take this a step further and just create a custom client and server application for both ends.
    – goldilocks
    Commented Mar 5, 2017 at 8:41

What about saving the data to a file on the Raspberry Pi, then using rsync to update the file on the PC at whatever frequency you wish.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.