This scripts sends data to Ubidots using TCP with a NodeMCU

Ubidots TCP ESP8266.cpp

/*************************************************************************************************
 * This Example sends harcoded data to Ubidots and serves as example for users that have devices
 * based on ESP8266 chips that we don't support with a library. This script is intended to send
 * data through TCP
 * 
 * This example is given AS IT IS without any warranty
 * 
 * Made by Jose García.
 *************************************************************************************************/



/********************************
 * Libraries included
 *******************************/

#include <ESP8266WiFi.h>

/********************************
 * Constants and objects
 *******************************/

char const * SSID_NAME = "...."; // Put here your SSID name
char const * SSID_PASS = "...."; // Put here your password
char const * HTTPSERVER = "translate.ubidots.com";
int HTTPPORT = 9012;

/* Keep in mind that for robust operation you should avoid to use String variables */
char* TOKEN = "..."; // Put here your TOKEN
char* VAR_LABEL = "test-var"; // Your variable ID
char* DEVICE_LABEL = "test-tcp"; // Your variable ID
char* USER_AGENT = "ESP8266";
char* VERSION = "1.0";
char* DEVICE_NAME = "Particle";
char str_value[6];
char* allData = (char *) malloc(sizeof(char) * 700);

WiFiClient clientUbi;

/********************************
 * Auxiliar Functions
 *******************************/


/********************************
 * Main Functions
 *******************************/

void setup() {
  Serial.begin(115200);
  
  /* Connects to AP */
  WiFi.begin(SSID_NAME, SSID_PASS);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
    }

  WiFi.setAutoReconnect(true);
  Serial.println(F("WiFi connected"));
  Serial.println(F("IP address: "));
  Serial.println(WiFi.localIP());

}

void loop() {

  /* Keep in mind that for robust operation you should avoid to use String variables */

  /* Adapt your value array following the structure specified at http://help.ubidots.com/developers/send-data-to-ubidots-over-tcp-or-udp */
  float sensor_value = random(0, 1000)*1.0;
  
  /* 4 is mininum width, 2 is precision; float value is copied onto str_temp*/
  dtostrf(sensor_value, 4, 2, str_value);

  /* Creates the socket payload */
  sprintf(allData, "%s/%s|POST|%s|%s:%s=>", USER_AGENT, VERSION, TOKEN, DEVICE_LABEL, DEVICE_NAME);
  sprintf(allData, "%s%s:%s", allData, VAR_LABEL, str_value);
  sprintf(allData, "%s|end", allData);
  
  clientUbi.connect(HTTPSERVER, HTTPPORT);

  if (clientUbi.connect(HTTPSERVER, HTTPPORT)) {
        Serial.println(F("Posting your variables: "));
        Serial.println(allData);
        clientUbi.print(allData);
  }

  while (clientUbi.available()) {
        char c = clientUbi.read();
        Serial.write(c);
  }

  clientUbi.stop();
  delay(5000);
}