Send temperature information into MQTT

Readme.md

@@ -23,3 +23,6 @@ Device can also be put in OTA mode and will wait for OTA from the espota tool.
 Provide previous WiFiAccessPointConfigurator features and can also measure temperature from a BMP180.
 
 To interface with BMP180, the following library should be installed into Arduino environment: https://github.com/mmaret/BMP180_Breakout_Arduino_Library/archive/master.zip
+
+To use mqtt, the Adafruit Mqtt library should be installed.
+This have been tested against a mosquitto server without username or password

WifiControlSensor/MQTT.ino

@@ -0,0 +1,23 @@
+// Function to connect and reconnect as necessary to the MQTT server.
+// Should be called in the loop function and it will take care if connecting.
+int MQTT_connect() {
+  int8_t ret;
+
+  // Stop if already connected.
+  if (mqtt.connected()) {
+    return 0;
+  }
+
+  uint8_t retries = 3;
+  while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected
+    Serial.println(mqtt.connectErrorString(ret));
+    Serial.println("Retrying MQTT connection ...");
+    mqtt.disconnect();
+    delay(100);  // wait
+    retries--;
+    if (retries == 0) {
+      return -1;
+    }
+  }
+  return 0;
+}

WifiControlSensor/WebServer.ino

@@ -1,5 +1,6 @@
 void handleRoot() {
   server.send(200, "text/html", "<h1>You are connected</h1><br/>"
+              "Current temperature "+String(temp,2)+"C<br/>"
               "<a href=\"/setup\">Setup</a><br/>"
               "<a href=\"/otamode\">OTA mode</a><br/>"
               "<a href=\"/gpio?gpio=2&amp;value=1\">ON</a><br/>"

WifiControlSensor/WifiControlSensor.ino

@@ -23,13 +23,21 @@
 #include <SFE_BMP180.h>
 #include <Wire.h>
 
+#include "Adafruit_MQTT.h"
+#include "Adafruit_MQTT_Client.h"
+
+#define AIO_SERVER      "192.168.0.250"
+#define AIO_SERVERPORT  1883                   // use 8883 for SSL
+#define AIO_USERNAME    ""
+#define AIO_PASSWORD    ""
+
 //#define ENABLE_EXTRA_GPIO
 
 #define EEPROM_SIZE 512
 char eeprom[EEPROM_SIZE];
 
 #define WEB_DELAY_MS 100
-#define SAMPLING_PERIODE_MS 5000
+#define SAMPLING_PERIODE_MS 60000
 
 /* I2C pin used*/
 #define SDA 2
@@ -39,8 +47,24 @@ char eeprom[EEPROM_SIZE];
 #define BOOTMODE_NORMAL 1
 #define BOOTMODE_OTA    2
 
+double temp;
 int mode;
 
+// Store the MQTT server, username, and password in flash memory.
+// This is required for using the Adafruit MQTT library.
+const char MQTT_SERVER[] PROGMEM    = AIO_SERVER;
+const char MQTT_USERNAME[] PROGMEM  = AIO_USERNAME;
+const char MQTT_PASSWORD[] PROGMEM  = AIO_PASSWORD;
+
+// Create an ESP8266 WiFiClient class to connect to the MQTT server.
+WiFiClient client;
+
+// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.
+Adafruit_MQTT_Client mqtt(&client, MQTT_SERVER, AIO_SERVERPORT, MQTT_USERNAME, MQTT_PASSWORD);
+
+const char TEMPERATURE_FEED[] PROGMEM = "/feeds/temperature";
+Adafruit_MQTT_Publish mqtt_temp = Adafruit_MQTT_Publish(&mqtt, TEMPERATURE_FEED);
+
 /* Set these to your desired credentials. */
 const char *ssid = "ESPConfigurator";
 
@@ -64,6 +88,9 @@ void readEEPROM(int &bootMode, char **ssid, char **password, char **host);
 /* BMP180 decl */
 int getTemperature(double &t);
 
+/* MQTT decl */
+int MQTT_connect();
+
 void setupWifi(int bootmode, int forceSetup, char *confSsid, char *confPassword, char *confHost) {
   IPAddress myIP;
   if (bootmode == BOOTMODE_SETUP || forceSetup) {
@@ -167,7 +194,7 @@ void setup() {
   }
 
   Serial.print("Force Setup Mode ? :");
-  Serial.print(txStatus?"No":"Yes");
+  Serial.print(txStatus ? "No" : "Yes");
   Serial.println();
 
   setupWifi(mode, txStatus == 0, confSsid, confPassword, confHost);
@@ -182,7 +209,6 @@ void setup() {
 }
 
 uint nbCycle = 0;
-double temp;
 void loop() {
   if (mode == BOOTMODE_OTA) {
     ArduinoOTA.handle();
@@ -190,14 +216,19 @@ void loop() {
     server.handleClient();
     delay(WEB_DELAY_MS);
     nbCycle++;
-    if (nbCycle > SAMPLING_PERIODE_MS/WEB_DELAY_MS){
-      if(getTemperature(temp) == 0){
+    if (nbCycle > SAMPLING_PERIODE_MS / WEB_DELAY_MS) {
+      if (getTemperature(temp) == 0) {
         Serial.print("Sampling :");
         Serial.println(temp);
-      }else{
+        if (MQTT_connect() == 0){
+          Serial.println("publishing !");
+          mqtt_temp.publish(temp);
+        }
+      } else {
         Serial.println("Cannot get T°C");
       }
       nbCycle = 0;
+
     }
   }
 }