MQTT + ESP8266 + BMP180 + TSL2561 + Cayenne

// This example shows how to connect to Cayenne using an ESP8266 and send/receive sample data. 
// Make sure you install the ESP8266 Board Package via the Arduino IDE Board Manager and select the correct ESP8266 board before compiling.  
//#define CAYENNE_DEBUG 
#define CAYENNE_PRINT Serial 
#include <CayenneMQTTESP8266.h> 
// WiFi network info. 
char ssid[] = "ssid"; 
char wifiPassword[] = "password"; 
// Cayenne authentication info. This should be obtained from the Cayenne Dashboard. 
char username[] = "username"; 
char password[] = "password"; 
char clientID[] = "clientID"; 
unsigned long lastMillis = 0; 
#include <Wire.h> 
#include <Adafruit_Sensor.h> 
#include <Adafruit_BMP085_U.h> 
#include <Adafruit_TSL2561_U.h> 
Adafruit_BMP085_Unified bmp = Adafruit_BMP085_Unified(10180); 
const int address = TSL2561_ADDR_FLOAT; 
Adafruit_TSL2561_Unified tsl = Adafruit_TSL2561_Unified(address, 12345); 
void setup() { 
 Serial.begin(9600); 
 Cayenne.begin(username, password, clientID, ssid, wifiPassword); 
 Wire.begin(0, 2); // SDA, SDL 
 if (!bmp.begin()) 
 { 
   CAYENNE_LOG("No BMP sensor detected"); 
   while (1); 
 } 
 if (!tsl.begin()) 
 { 
   CAYENNE_LOG("No TSL2561 detected"); 
   while (1); 
 } 
 tsl.enableAutoRange(true); 
 /* Changing the integration time gives you better sensor resolution (402ms = 16-bit data) */ 
 tsl.setIntegrationTime(TSL2561_INTEGRATIONTIME_13MS);      /* fast but low resolution */ 
 // tsl.setIntegrationTime(TSL2561_INTEGRATIONTIME_101MS);  /* medium resolution and speed   */ 
 // tsl.setIntegrationTime(TSL2561_INTEGRATIONTIME_402MS);  /* 16-bit data but slowest conversions */ 
} 
void loop() { 
 Cayenne.loop(); 
 //Publish data every 1 seconds (1000 milliseconds). Change this value to publish at a different interval. 
 if (millis() - lastMillis > 1000) { 
   lastMillis = millis(); 
   //Write data to Cayenne here. This example just sends the current uptime in milliseconds. 
   Cayenne.virtualWrite(0, lastMillis); 
   sensors_event_t event; 
   tsl.getEvent(&event); 
   float pressure; 
   bmp.getPressure(&pressure); 
   float temperature; 
   bmp.getTemperature(&temperature); 
   Cayenne.virtualWrite(3, event.light, TYPE_LUMINOSITY, UNIT_LUX); 
   Cayenne.virtualWrite(1, pressure, TYPE_BAROMETRIC_PRESSURE, UNIT_PASCAL); 
   Cayenne.virtualWrite(2, temperature, TYPE_TEMPERATURE, UNIT_CELSIUS); 
   //Some examples of other functions you can use to send data. 
   //Cayenne.celsiusWrite(1, 22.0); 
   //Cayenne.luxWrite(2, 700); 
   //Cayenne.virtualWrite(3, 50, TYPE_PROXIMITY, UNIT_CENTIMETER); 
 } 
} 
//Default function for processing actuator commands from the Cayenne Dashboard. 
//You can also use functions for specific channels, e.g CAYENNE_IN(1) for channel 1 commands. 
CAYENNE_IN_DEFAULT() 
{ 
 CAYENNE_LOG("CAYENNE_IN_DEFAULT(%u) - %s, %s", request.channel, getValue.getId(), getValue.asString()); 
 //Process message here. If there is an error set an error message using getValue.setError(), e.g getValue.setError("Error message"); 
}