[SOLVED] Getting HTTP/1.1 400 Bad Request

Ubidots API
1

Hey,
I have been creating a project to send temperature and humidity sensor value’s using MediaTek LinkIt One and WiFi to ubidots dashboard, the data is being uploaded but getting HTTP/1.1 400 Bad Request after uploading the data!!

2

Hey Alpha,

Here’s a newer code I used for the Linkit One. Unlike the original Ubidots example:

  • it leaves the connection open and sends requests through it many times. The other example opens the connection every time it sends a sensor reading.
  • When the connection closes, it opens it again.
  • When the WiFi drops, it reconnects again
  • It uses the collection endpoint, so you can send data of several readings at the same time.

Code:

  /*
 Ubidots WiFi client

 This sketch reads an analog input and sends this value to Ubidots

 Change the macro WIFI_AP, WIFI_PASSWORD, WIFI_AUTH, URL, TOKEN and VARIABLE_ID accordingly.

 based on the Web Client example created 13 July 2010
 by dlf (Metodo2 srl)
 modified 31 May 2012
 by Tom Igoe
 modified 20 Aug 2014
 by MediaTek Inc.
 modified 2 Sep 2015
 by Ubidots, Inc.
 */

#include <LTask.h>
#include <LWiFi.h>
#include <LWiFiClient.h>

#define WIFI_AP "MTK Hackathon"
#define WIFI_PASSWORD ""
#define WIFI_AUTH LWIFI_OPEN  // choose from LWIFI_OPEN, LWIFI_WPA, or LWIFI_WEP.

// Ubidots information

#define URL    "things.ubidots.com"
#define TOKEN  "Sxxxxxxxxx9m4wX"          // replace with your Ubidots token generated in your profile tab
#define VARID1 "55fda54a762542789fe3415b"                // create a variable in Ubidots and put its ID here (http://app.ubidots.com/ubi/datasources/)
#define VARID2 "55fda553762542789fe34166" 
#define VARID3 "55fda55a76254279041bb2cb"

void setup()
{
  LTask.begin();
  LWiFi.begin();
  Serial.begin(9600);

  // keep retrying until connected to AP
  Serial.println("Connecting to AP");
  while (0 == LWiFi.connect(WIFI_AP, LWiFiLoginInfo(WIFI_AUTH, WIFI_PASSWORD)))
  {
    delay(1000);
  }
}

boolean wifi_status(LWifiStatus ws){
  switch(ws){
    case LWIFI_STATUS_DISABLED:
      return false;
    break;
    case LWIFI_STATUS_DISCONNECTED:
      return false;
    break;
    case LWIFI_STATUS_CONNECTED:
      return true;
    break;
  }
  return false;
}


void loop()
{   
  Serial.println("Connecting to Ubidots...");
  LWiFiClient c;
  while (!c.connect(URL, 80))
  {
    Serial.println("Retrying to connect...");
    delay(100);
  }

  Serial.println("Connected!");

  while(1){
    LWifiStatus ws = LWiFi.status();
    boolean status = wifi_status(ws);
    if(!status){
      Serial.println("Connecting to AP");
      while (0 == LWiFi.connect(WIFI_AP, LWiFiLoginInfo(WIFI_AUTH, WIFI_PASSWORD)))
      {
        delay(500);
      }
    }
    String payload = "[{\"variable\":\"" VARID1 "\",\"value\":"+ String(analogRead(A0)) + "},{\"variable\":\"" VARID2 "\",\"value\":" + String(analogRead(A1)) + "},{\"variable\":\"" VARID3 "\",\"value\":" + String(analogRead(A2)) + "}]";
    String le = String(payload.length());    
    
    if(!c.connected()){
      while (!c.connect(URL, 80)){
        delay(100);
      }
      Serial.println("Client reconnected!");
    }   
    
    // Build HTTP POST request
    c.print(F("POST /api/v1.6/collections/values/?token="));
    c.print(TOKEN);
    c.println(F(" HTTP/1.1"));
    c.println(F("Content-Type: application/json"));
    c.print(F("Content-Length: "));
    c.println(le);
    c.print(F("Host: "));
    c.println(URL);
    c.println(); 
    c.println(payload);  
    
    int v;
    while(c.available()){  
      v = c.read();
      if(v < 0){
        Serial.println("No response.");
        break;
      }
      //Serial.print((char)v);
    }
    delay(1000);
  }
}