This script is intended to explain how to send data using a Finite State Machine, FSM, to Ubidots

UBIDOTS_FSM.cpp

/****************************************
 * Include Libraries
 ****************************************/
#include "UbidotsESPMQTT.h"

/****************************************
 * Define Constants
 ****************************************/
#define TOKEN "...." // Your Ubidots TOKEN
#define WIFINAME "...." //Your SSID
#define WIFIPASS "...." // Your Wifi Pass
#define WAIT 0
#define READ_SEND 1

uint8_t fsm_state = WAIT;  // Initial state
int msCount = 0;  // time counter
float value;  // memory space for the value to be read

Ubidots client(TOKEN);

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

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i=0;i<length;i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();
}

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

void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(A0, INPUT);
  client.wifiConnection(WIFINAME, WIFIPASS);
  client.begin(callback);
}

// the loop function runs over and over again forever
void loop() {
  switch(fsm_state) {
    case WAIT:
      if (msCount == 1000){
        msCount = 0;
        fsm_state = READ_SEND;
      }
      break;
      
    case READ_SEND:
      value = analogRead(A0);
      
      if(!client.connected()){
        client.reconnect();
      }
      
      /* Routine for sending data */
      client.add("stuff", value);
      client.ubidotsPublish("source1");
      client.loop();
      fsm_state = WAIT;
      break;
      
    default:
      break;
  }

  // Increments the counter
  msCount += 1;
  delay(1);
}