Problems with HTTP.GET

Troubleshooting
1

Hi

I have an particle Argon and trying to do a HTTP.GET to a php site that will update an sql database with some sensor data. But my code wont work as I want. What am I doing wrong?

// This #include statement was automatically added by the Particle IDE.
#include <HttpClient.h>

// This #include statement was automatically added by the Particle IDE.
#include <Adafruit_DHT.h>



#define DHTPIN D4

#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

HttpClient http;

// Headers currently need to be set at init, useful for API keys etc.
http_header_t headers[] = {
    //  { "Content-Type", "application/json" },
    //{ "Accept" , "application/json" },
    { "Accept" , "*/*"},
    { NULL, NULL } // NOTE: Always terminate headers will NULL
};

http_request_t request;
http_response_t response;


void setup() {
    Serial.begin(9600);
    dht.begin();
}

void loop() {
    
    float t = dht.getTempCelcius();
    
    if (isnan(t)) {
        Serial.println("Failed to read from DHT sensor!");
        return;
    }
    
    Particle.publish("temp", String (t));
    
    request.hostname = "test.mysite.com";
    request.port = 80;
    request.path = "/index.php?deviceid=" + System.deviceID() + "&variable=temp&value=" + t;
    
    Particle.publish("Publish", request.path);
    

    http.get(request, response, headers);
    Particle.publish("BodyStatus", response.body);
    
    delay(30000);
}

When I post this url in a webbrowser it all works fine, and the DB is updated with new data.
" http://test.mysite.com/index.php?deviceid=ABC123&variable=temp&value=26.000000"

Thanks / Johan

2

Sorry for being pedantic, but what do you want to get back with that request?
While a GET request may be easier to test with a browser, putting data into a DB would usually be done via a PUT or maybe POST request :wink:

You do Particle.publish("PUBLISH", request.path) but don’t show what that gives you :wink:

However, try + String(t) instead of + t.
Also, what is your response.status?

3

Sorry, I'm new to this so that is why not all of it is OK. :slight_smile:

I do a Particle.publish just to see so the request.path is looking right.

Have changed to String instead of just t

and the response.status is -1

4

I have tried something similiar with this code

#include <HttpClient.h>

HttpClient http;

http_header_t headers[] = {
    //{ "Content-Type", "application/json" },
    //{ "Accept" , "application/json" },
    { "Accept" , "*/*"},
    { NULL, NULL } // NOTE: Always terminate headers will NULL
};

http_request_t request;
http_response_t response;
IPAddress serverIP(192, 168, x, y);

void setup() {
    Serial.begin(9600);
}

void loop() {
    float t = 123.45;
    char path[128];
    snprintf(path, sizeof(path), "/index.php?deviceid=%s&variable=temp&value=%.2f", (const char*)System.deviceID(), t);
    Serial.println(path);
    
    //request.hostname = "test.mysite.com";
    request.ip = serverIP;
    request.port = 80;
    request.path = path;

    http.get(request, response, headers);

    Serial.printlnf("Response (%d): <%s>", response.status, (const char*)response.body);
    delay(5000);
}

Hitting this test server on my own network

var http = require('http');

//create a server object:
http.createServer(function (req, res) {
  console.log(req.rawHeaders);
  console.log(req.url);
  res.write('Hello World!'); //write a response to the client
  res.end(); //end the response
}).listen(80); //the server object listens on port 8080

And what should I say, it worked as expected :wink: