Diff: main.cpp

Revision:

24:74f170dfd425

Parent:

21:a68bd76740f9

Child:

25:f2980e155d95

--- a/main.cpp	Tue Jan 16 13:41:29 2018 +0000
+++ b/main.cpp	Tue Jan 04 11:10:00 2022 +0000
@@ -26,7 +26,7 @@
  */
 
  // change this to 1 to output messages to LCD instead of serial
-#define USE_LCD 0
+#define USE_LCD 1
 
 #if USE_LCD
 #include "C12832.h"
@@ -34,7 +34,7 @@
 // the actual pins are defined in mbed_app.json and can be overridden per target
 C12832 lcd(LCD_MOSI, LCD_SCK, LCD_MISO, LCD_A0, LCD_NCS);
 
-#define logMessage lcd.cls();lcd.printf
+#define logMessage lcd.cls();lcd.locate(0,0);lcd.printf
 
 #else
 
@@ -42,98 +42,636 @@
 
 #endif
 
-#define MQTTCLIENT_QOS2 1
+#define MQTTCLIENT_QOS2 0
+
+#include "easy-connect.h" //Ethernet Connection library
+#include "MQTTNetwork.h" //MQTT Connection
+#include "MQTTmbed.h"  //MQTT Connection
+#include "MQTTClient.h" //MQTT Connection
+#include "string.h";
+
+#include "mbed.h" 
+//#include "platform/mbed_thread.h"
+#include "FP.h" //For function pointer usage
+#include "MQ2.h" //Smoke and Gas detector library
+#include "LM75B.h" //Temperature sensor
+
+#define ON 1 
+#define OFF 0
+
+#define PUMP PTC1 //Relay Signal for controlling pump
+#define TRIGGER PTB18 //Trigger pin for ultrasonic sensor
+#define ECHO PTB19 //Echo pin for ultrasonic sensor
+#define MQ2_SIG PTC10 //Smoke and Gas sensor output pin
+#define ALARM_SIG PTC8 //Alarm Signal Pin
+#define FAN_SIG PTC9 //Fan signal pin
+
+//Global variables to update the ThingSpeak channel fields.
+int WATER_LEVEL = 0; 
+float CO_level = 0;
+float SMOKE_level = 0;
+float GAS_level = 0;
+float TEMPERATURE = 0;
+int FAN_STATE = 0;
+int ALARM_STATE = 0;
+int PUMP_STATE = 0;
+
+class indicator{ //class to allow easy usage of RGB LED 
+    private:
+        DigitalOut RED; //LED1
+        DigitalOut BLUE; //LED2
+        DigitalOut GREEN; //LED3
+        Ticker blink; //Ticker to start blinking
+        bool red_set; //bool to check if RED is ON
+        bool green_set; //bool to check if GREEN is ON
+        bool blue_set; //bool to check if BLUE is ON
+        
+        void blink_effect(){ //function to flip LEDs to generate blink effect
+            if(red_set)
+                RED = !RED;
+            if(green_set)
+                GREEN = !GREEN;
+            if(blue_set)
+                BLUE = !BLUE;
+        }
+ 
+    public:
+         indicator(PinName _LED1, PinName _LED2, PinName _LED3):RED(_LED1, 1), GREEN(_LED2, 1), BLUE(_LED3, 1){ //Initialize RGB LEDs with requried PINS.
+             red_set = false; green_set = false; blue_set = false; //All LED intially OFF.
+        }
+        
+        void red_led(){ //Set Only RED LED
+            RED = 0; red_set = true; 
+            GREEN = 1; green_set = false;
+            BLUE = 1; blue_set = false;
+        }
+        
+        void green_led(){ //Set Only GREEN LED
+            RED = 1; red_set = false;
+            GREEN = 0; green_set = true;
+            BLUE = 1; blue_set = false;
+        }
+        void blue_led(){//Set Only BLUE LED
+            RED = 1; red_set = false;
+            GREEN = 1; green_set = false;
+            BLUE = 0; blue_set = true;
+        }
+        void amber_led(){//Set Only AMBER LED
+            RED = 0; red_set = true;
+            GREEN = 0; green_set = true;
+            BLUE = 1; blue_set = false;
+        }
+        void pink_led(){//Set Only PINK LED
+            RED = 0; red_set = true;
+            GREEN = 1; green_set = false;
+            BLUE = 0; blue_set = true;
+        }
+        void cyan_led(){//Set Only CYAN LED
+            RED = 1; red_set = false;
+            GREEN = 0; green_set = true;
+            BLUE = 0; blue_set = true;
+        }
+        void white_led(){//Set Only WHITE LED
+            RED = 0; red_set = true;
+            GREEN = 0; green_set = true;
+            BLUE = 0; blue_set = true;
+        }
+        void all_led_off(){//Set All LED OFF
+            RED = 1; red_set = false;
+            GREEN = 1; green_set = false;
+            BLUE = 1; blue_set = false;
+        }
+        void start_blink(float blink_interval){ //Start blinking on current LED using tikcer to avoid code blocking
+            blink.attach(callback(this, &indicator::blink_effect), blink_interval);
+        }
+        void stop_blink(){ //Stop blinkink. Detach Ticker function call
+            blink.detach();
+            if(red_set) //Set last LED being used as ON.
+                RED = 0;
+            if(green_set)
+                GREEN = 0;
+            if(blue_set)
+                BLUE = 0;        
+        }
+};
+
+indicator led_indicator(LED1, LED2, LED3); //Use K64f RGB LED for water pump
+indicator shield_led_indicator(D5, D9, D8); //Use Application Shield's RGB LED for MQ2 sensor
+
+class ultrasonic{ //Ultrasonic sensot for measuring depth of water in tank
+    private:
+        DigitalOut trigger;//DigitalOut trigger; //trigger pin for UltarSonic sensor
+        InterruptIn echo; //Echo pin for water_level measurement. Uses as Interrupt to avoid code execution blocking.
+        Ticker measure; //Ticker to trigger water_level measurement periodically.
+        Timeout trigger_low; //Timeout interrupt to set trigger pin low after 10us of HIGH.
+        Timer echoTimer; //Timer to get the time elapsed between echo sent and echo received back
+        int echo_time_us; //Timer taken by echo to resturn abck to module.
+        float interval; //Interval after which periodic measurement should start
+        volatile bool measuring;
+        FP<void,int> fp;
+         
+        void set_trigger_high(){ //Function to set Trigger Pin HIGH for 10us and set measuring = true
+            measuring = true;
+            trigger = ON;
+            trigger_low.attach_us(callback(this, &ultrasonic::set_trigger_low), 10); //set trigger pin OFF after 10us   
+        }
+        
+        void set_trigger_low(void){ //Function to set trigger pin LOW to fiish trigger after 10us. This will be called by low timer object.
+            trigger = OFF;
+        }
+        
+        void start_echo(void){//Function to start listening for echo back. This will start timer echoTimer. Will be based on Echo Pin RISE(or HIGH)
+            if(!measuring) return; //avoid fluctuations on echo pin if any. Continue echo calculation only if measuring is TRUE.
+            echoTimer.reset();
+            echoTimer.start(); //Timer start since Echo pin is HIGH
+        }
+        void stop_echo(void){//Function to stop echoTimer after echo received back. Will be based on Echo Pin FALL(or LOW).
+            if (!measuring)return; //avoid fluctuations on echo pin if any
+            echoTimer.stop(); //stop timer since echo pin back to LOW
+            echo_time_us = echoTimer.read_us(); //Calculate time for ultrasonic wave RTT.
+            if(echo_time_us > 2000 || echo_time_us < 125)return; //ignore reading in case abnormally high or low RTT time
+            measuring = false; //Marke measurement completed
+            fp(echo_time_us / (29 * 2));
+        }
+public: 
+        ultrasonic(PinName _trigger, PinName _echo,float _interval):trigger(_trigger), echo(_echo){ //Constructor: initialize trigger(default value OFF) & echo pin
+            interval = _interval;
+            echo.rise(callback(this, &ultrasonic::start_echo)); //Attach function to Interrupt on Echo pin Rise
+            echo.fall(callback(this, &ultrasonic::stop_echo)); //Attach function to Interrupt on Echo pin Fall
+            measuring = false;
+        }
+
+        void start_measure(){ //function to Set Trigger Pin high repeatedly every 'time' seconds
+            measure.attach(callback(this, &ultrasonic::set_trigger_high),interval);//ticker to trigger measurement with callback function
+        }
+        void stop_measure(void){ //Dettach from Ticker and stop measurements
+            measuring = false;
+            measure.detach();
+        }
+        void req_callBack(FP<void, int> _fp){
+            fp = _fp;
+        }
+};
 
-#include "easy-connect.h"
-#include "MQTTNetwork.h"
-#include "MQTTmbed.h"
-#include "MQTTClient.h"
+class pump{
+    private:
+        DigitalOut signal; //Signal for relay to set PUMP ON and OFF
+        ultrasonic sensor; //Ultrasonic module objet for measuring depth of water
+        volatile bool pump_on_request; //Bool to inform whether ita PUMP on request or only water depth meas.
+        const int LEVEL_LOW = 4; //Low Water level defined as 4CM. Signifies Tank FULL.
+        const int LEVEL_HIGH = 9; //High Water level defined as 11CM. Signifies Tank EMPTY.
+        FP<void, int> fp; //Function pointer to receive call back with depth of water level in tank.
+        
+    public:        
+        //Initialize Ultrasonic module with TRIG and ECHO pin along with measurement interval.
+        pump(PinName _signal, PinName _trigger, PinName _echo, float _interval):signal(_signal), sensor(_trigger, _echo, _interval){ 
+            pump_on_request = false;
+            fp.attach(this, &pump::update_depth); //update_depth function will be called bu ultrasonic module when depth meas is completed.
+            sensor.req_callBack(fp); //set call back.
+        }
+        void start_measurement(int interval){
+            sensor.start_measure(); //Start depth measurements to calculate the water level.
+        }
+        void stop_measurement(){
+            sensor.stop_measure(); //Start depth measurements to calculate the water level.
+        }
+    
+        void pump_on(){ //Pump On request by User.
+            pump_on_request = true; //bool to confirm that Pump On request is raised
+            //sensor.start_measure(); //Start depth measurements to calculate the water level.
+        }
+        void pump_off(){ //Switch OFF the pump
+            pump_on_request = false; //Set User request to flase.
+            //sensor.stop_measure(); //Stop the ultrasonic measurements
+            signal = OFF; //Relay Signal for pump OFF.
+            PUMP_STATE = OFF;
+        }
+        
+        void get_depth(){ //Only depth of water requried. no need to switch ON pump.
+            if(signal == OFF) //If Already PUMP ONdont start measurement again. 
+                sensor.start_measure(); //Start Ultrasonic Measurements
+        }
+        
+        void update_depth(int depth){ //Depth from ultrasonic is available
+            WATER_LEVEL = depth;
+            if(depth <= LEVEL_LOW) // set GREEN LED to inidicate the tank is FULL
+                led_indicator.green_led();
+            else if(depth <= LEVEL_HIGH)// set Amber LED to inidicate the tank is more than HALF
+                led_indicator.amber_led();
+            else 
+                led_indicator.red_led();// set RED LED to inidicate the tank is less than HALF
+            
+            if(depth <= LEVEL_LOW && signal == ON)//Tank FULL and PUMP ON. Switch OFF PUMP.
+                pump_off();
+            else if(signal == OFF && pump_on_request && depth > LEVEL_HIGH ) //Pump is OFF and User have requested to on PUMP
+                signal = ON;  //Pump ON 
+            else if(signal == ON && !pump_on_request) //If PUMP is ON but not requster by User.
+                pump_off(); //Pump OFF
+            else if(signal == OFF && !pump_on_request) // Only for depth measurement. Pump on is not requested by user.
+                pump_off();
+            PUMP_STATE = signal;
+        }
+};
+
+class control{ //Control object for fan and alarm. Only Switch ON and OFF requried.
+    private:
+        DigitalOut signal; //Signal pin for object
+    public:
+        control(PinName _signal, int state):signal(_signal,state){ //Initialize Signal PIN with default state(ON or OFF)
+        }
+        
+        void set_state(int state){ //Set the state of control
+            if (state >= 1){ //Switch ON
+                signal = ON;
+                led_indicator.pink_led(); //Blink RED LED
+            }
+            else //Switch OFF
+                signal = OFF; //Set Control OFF
+            //publish data
+        }
+        int get_state(){ //Get the state of the control
+            return signal.read(); 
+        }
+};
+
+class _temperature{ //Object for measuring current temperature and taking action accordingly
+    private:
+        LM75B temp_sensor; //LM75B temperature library used.
+        float temperature_threshold_fan; // Threshold value for switching ON the FAN
+        float temperature_threshold_alarm; // Threshold value for switching ON the ALARM
+        Ticker periodic_meas; //Ticker for periodic measurement of the temperature
+        control* alarm; //Poniter to control the alarm
+        control* fan; //Poniter to control the fan
+        void read_data(){ //Read the temperature from sensor
+            TEMPERATURE = temp_sensor.temp(); //Use global variable TEMPERATURE which will be sent to ThingSpeak.
+            if(TEMPERATURE >= temperature_threshold_alarm){ //Check if alarm threshold met.
+                alarm->set_state(ON); //Set Alarm ON
+                shield_led_indicator.red_led(); //Start RED LED Blinking
+            }
+            else if(TEMPERATURE >= temperature_threshold_fan){//Check if fan threshold met.
+                shield_led_indicator.amber_led();//Set Amber LED Blinking
+                fan->set_state(ON);//Set Alarm ON
+                FAN_STATE = ON;
+            }
+            else
+                shield_led_indicator.green_led();
+        }
+    public:
+        _temperature(control* _alarm, control* _fan):temp_sensor(D14,D15){ //Initialize temp sensor with shield PINs D14, D15
+            alarm = _alarm; //received object for alarm from Main function
+            fan = _fan;//received object for fan from Main function
+            temperature_threshold_fan = 30; //Fan threshold
+            temperature_threshold_alarm = 40; //Alarm threshold
+        }
+        void start_measurement(int interval){ 
+            periodic_meas.attach(callback(this, &_temperature::read_data), interval); //Start ticker based periodic temperature measurement
+        }
+        void stop_measurement(int interval){
+            periodic_meas.detach();  //Stop ticker.
+        }         
+};
+
+class _smoke_detector{ //Class to control the MQ2 Gas and Smoke detector
+    private:
+        MQ2 mq2; //Existing MQ2 library is used
+        MQ2_data_t data; //data field to read the CO, SMOKE & GAS levels
+        float CO_threshold_fan; //FAN Threshold for Carbon Monoxide
+        float CO_threshold_alarm;//ALARM Threshold for Carbon Monoxide
+        float GAS_threshold_fan; //FAN Threshold for combustible GASES
+        float GAS_threshold_alarm; //ALARM Threshold for combustible GASES
+        float SMOKE_threshold_fan; //FAN Threshold for SMOKE
+        float SMOKE_threshold_alarm;//ALARM Threshold for SMOKE
+        control* fan; //Poniter to control the fan
+        control* alarm; //Poniter to control the alarm
+        Ticker periodic_meas; //Ticker to complete periodic measurements
+        
+        void read_data(){ //Read the GAS/CO/SMOKE level from sensor
+            mq2.read(&data);
+            CO_level = mq2.readCO(); //CO Level
+            GAS_level = mq2.readLPG(); //GAS Level
+            SMOKE_level = mq2.readSmoke(); //SMOKE Level
+            //Check if alarm threhold is crossed for any measurements
+            if(data.co >= CO_threshold_alarm || data.lpg >= GAS_threshold_alarm || data.smoke >= SMOKE_threshold_alarm){ 
+                shield_led_indicator.red_led(); //Set RED Blinker
+                alarm->set_state(ON); //Set alarm ON
+            }
+            //Check if fan threhold is crossed for any measurements
+            else if(data.co >= CO_threshold_fan || data.lpg >= GAS_threshold_fan || data.smoke >= SMOKE_threshold_fan){ 
+                shield_led_indicator.amber_led(); //Set AMBER LED
+                fan->set_state(ON); //Set FAN ON
+            }
+        }
+        
+    public:
+        //Initialize MQ2 sensor using Analog pin.
+        _smoke_detector(PinName _analog, control* _alarm, control* _fan):mq2(_analog){ 
+            mq2.begin(); //mq2 begin method to Calibrate sensor
+            fan = _fan; //Fan control object from Main function
+            alarm = _alarm;//Alarm control object from Main function
+            CO_threshold_alarm = 3;
+            CO_threshold_fan = 2;
+            GAS_threshold_fan = 2;
+            GAS_threshold_alarm = 3;
+            SMOKE_threshold_alarm = 3;
+            SMOKE_threshold_fan = 2;
+        }
+               
+        void start_measurement(int interval){ //Start Ticker based periodic measurements
+            periodic_meas.attach(callback(this, &_smoke_detector::read_data), interval);
+        }
+        void stop_measurement(){//Stop Ticker based periodic measurements
+            periodic_meas.detach();
+        }  
+};
 
 int arrivedcount = 0;
 
+pump water_pump(PUMP,TRIGGER, ECHO, 1); //Water Pump object
+control alarm(ALARM_SIG, ON); //Alarm Pump object
+control fan(FAN_SIG, OFF); //Fan object
+_smoke_detector smoke_detector(MQ2_SIG, &alarm, &fan); //Smoke Detector object
+_temperature temperature(&alarm, &fan);//Uses fixed PIN on shiled- D14, D15. So no need to pass from main
+NetworkInterface* network = easy_connect(true); //Network object. Creates ethernt conncetion
+MQTTNetwork mqttNetwork(network); //MQTTNetwork object. Takes Network object as input for connection over ethernet
+MQTT::Client<MQTTNetwork, Countdown> client(mqttNetwork); //MQTT Client for Connction with broker, Subscribe and Publsih service.
 
-void messageArrived(MQTT::MessageData& md)
+ 
+void field1_pump_state(MQTT::MessageData& md) //Callback functionf for Field1 from thingspeak.
+{
+    MQTT::Message &message = md.message; //Message recived using MQTT
+    logMessage("Message arrived: qos %d, retained %d, dup %d, packetid %d\r\n", message.qos, message.retained, message.dup, message.id);
+    logMessage("Message Field1 %s\r\n", message.payload); //Message Payload
+    if(strtol((char *)message.payload, '\0', 10) == 1){  //convert to int and check if power ON command
+        logMessage("Water Pump ON\r\n"); 
+        water_pump.stop_measurement();
+        water_pump.start_measurement(2); //Start Water Pump measurements. At intervals of 2s. This is small value because for test purpose very small tank is being used. In real life this could be in mins.
+        water_pump.pump_on(); //Start the pump for 1st time
+    }
+    else{
+        logMessage("Water Pump OFF\r\n"); 
+        water_pump.pump_off(); //Power off pump otherwise
+    }
+}
+
+void field2_fan_state(MQTT::MessageData& md)//Callback functionf for Field2 from thingspeak.
+{
+    MQTT::Message &message = md.message; //Message recived using MQTT
+    logMessage("Message arrived: qos %d, retained %d, dup %d, packetid %d\r\n", message.qos, message.retained, message.dup, message.id);
+    logMessage("Message Field2 %s\r\n", message.payload);//Message Payload
+    if(strtol((char *)message.payload, '\0', 10) == 1){//convert to int and check if power ON command
+        logMessage("FAN ON\r\n");
+        fan.set_state(OFF);//Power On FAN
+    }
+    else{
+        logMessage("FAN OFF\r\n");
+        fan.set_state(ON);//Power off fan otherwise
+    }
+}
+
+void field3_alarm_state(MQTT::MessageData& md)
 {
     MQTT::Message &message = md.message;
     logMessage("Message arrived: qos %d, retained %d, dup %d, packetid %d\r\n", message.qos, message.retained, message.dup, message.id);
-    logMessage("Payload %.*s\r\n", message.payloadlen, (char*)message.payload);
+    logMessage("Message Field3 %s\r\n", message.payload);
+//    RED = strtol((char *)message.payload, '\0', 10);
+    if(strtol((char *)message.payload, '\0', 10) == 1){//convert to int and check if power ON command
+        logMessage("Alarm ON\r\n");;//Power On Alarm. This scenario should never occur,
+        alarm.set_state(ON);
+    }
+    else{
+        logMessage("Alarm OFF\r\n");
+        alarm.set_state(OFF); //Power off Alarm otherwise
+    }
     ++arrivedcount;
 }
 
+void publish_field1(){ //Function to publish the values to ThingSpeak fields
+    static int last_update = -1;
+    if(PUMP_STATE == last_update)
+        return; //Ignore unncessary update in case no chnage in value.
+    last_update = PUMP_STATE;
+    logMessage("Publish Routine\r\n");
+    int rc = 0;
+    MQTT::Message message; 
+    char* topic = "channels/1608275/publish";//Topic contaning Channel ID
+    char buf[100]; //Buffer for storing data
+    sprintf(buf, "field1=%d&status=MQTTPUBLISH",PUMP_STATE);
+    message.qos = MQTT::QOS0; //MQTT QOS 0 used. Best effort QOS
+    message.retained = false;
+    message.dup = false;
+    message.payload = (void*)buf; //Copy buffer to Message Payload
+    message.payloadlen = strlen(buf)+1;
+    rc = client.publish(topic, message); //Publsih data using MQTT client
+    logMessage("Publish rc: %d, Buf: %s\r\n", rc, buf);
+}
+
+void publish_field2(){ //Function to publish the values to ThingSpeak fields
+    static int last_update = -1;
+    if(FAN_STATE == last_update)
+        return; //Ignore unncessary update in case no chnage in value.
+    last_update = FAN_STATE;
+    logMessage("Publish Routine\r\n");
+    int rc = 0;
+    MQTT::Message message; 
+    char* topic = "channels/1608275/publish";//Topic contaning Channel ID
+    char buf[100]; //Buffer for storing data
+    sprintf(buf, "field2=%d&status=MQTTPUBLISH",FAN_STATE);
+    message.qos = MQTT::QOS0; //MQTT QOS 0 used. Best effort QOS
+    message.retained = false;
+    message.dup = false;
+    message.payload = (void*)buf; //Copy buffer to Message Payload
+    message.payloadlen = strlen(buf)+1;
+    rc = client.publish(topic, message); //Publsih data using MQTT client
+    logMessage("Publish rc: %d, Buf: %s\r\n", rc, buf);
+}
+
+void publish_field3(){ //Function to publish the values to ThingSpeak fields
+    static int last_update = -1;
+    if(ALARM_STATE == last_update)
+        return; //Ignore unncessary update in case no chnage in value.
+    last_update = ALARM_STATE;
+    logMessage("Publish Routine\r\n");
+    int rc = 0;
+    MQTT::Message message; 
+    char* topic = "channels/1608275/publish";//Topic contaning Channel ID
+    char buf[100]; //Buffer for storing data
+    sprintf(buf, "field3=%d&status=MQTTPUBLISH",ALARM_STATE);
+    message.qos = MQTT::QOS0; //MQTT QOS 0 used. Best effort QOS
+    message.retained = false;
+    message.dup = false;
+    message.payload = (void*)buf; //Copy buffer to Message Payload
+    message.payloadlen = strlen(buf)+1;
+    rc = client.publish(topic, message); //Publsih data using MQTT client
+    logMessage("Publish rc: %d, Buf: %s\r\n", rc, buf);
+}
+
+void publish_field4(){ //Function to publish the values to ThingSpeak fields
+    static int last_update = -1;
+    last_update = WATER_LEVEL;
+    //logMessage("Publish Routine\r\n");
+    int rc = 0;
+    MQTT::Message message; 
+    char* topic = "channels/1608275/publish";//Topic contaning Channel ID
+    char buf[100]; //Buffer for storing data
+    //field5=%0.1f&field6=%0.1f&field7=%0.1f&field8=%0.1f&
+    sprintf(buf, "field4=%d&field1=%d&field2=%d&field3=%d&status=MQTTPUBLISH",WATER_LEVEL, PUMP_STATE,FAN_STATE,ALARM_STATE);
+    message.qos = MQTT::QOS0; //MQTT QOS 0 used. Best effort QOS
+    message.retained = false;
+    message.dup = false;
+    message.payload = (void*)buf; //Copy buffer to Message Payload
+    message.payloadlen = strlen(buf)+1;
+    rc = client.publish(topic, message); //Publsih data using MQTT client
+    //logMessage("Publish rc: %d, Buf: %s\r\n", rc, buf);
+}
+
+void publish_field5(){ //Function to publish the values to ThingSpeak fields
+    static int last_update = -1;
+    last_update = GAS_level;
+    //logMessage("Publish Routine\r\n");
+    int rc = 0;
+    MQTT::Message message; 
+    char* topic = "channels/1608275/publish";//Topic contaning Channel ID
+    char buf[100]; //Buffer for storing data
+    sprintf(buf, "field5=%d&field6=%d&field7=%d&field8=%d&status=MQTTPUBLISH",GAS_level, CO_level, SMOKE_level, TEMPERATURE);
+    message.qos = MQTT::QOS0; //MQTT QOS 0 used. Best effort QOS
+    message.retained = false;
+    message.dup = false;
+    message.payload = (void*)buf; //Copy buffer to Message Payload
+    message.payloadlen = strlen(buf)+1;
+    rc = client.publish(topic, message); //Publsih data using MQTT client
+    //logMessage("Publish rc: %d, Buf: %s\r\n", rc, buf);
+}
+
+void publish_field6(){ //Function to publish the values to ThingSpeak fields
+    static int last_update = -1;
+    if(CO_level == last_update)
+        return; //Ignore unncessary update in case no chnage in value.
+    last_update = CO_level;
+    logMessage("Publish Routine\r\n");
+    int rc = 0;
+    MQTT::Message message; 
+    char* topic = "channels/1608275/publish";//Topic contaning Channel ID
+    char buf[100]; //Buffer for storing data
+    sprintf(buf, "field6=%d&status=MQTTPUBLISH",CO_level);
+    message.qos = MQTT::QOS0; //MQTT QOS 0 used. Best effort QOS
+    message.retained = false;
+    message.dup = false;
+    message.payload = (void*)buf; //Copy buffer to Message Payload
+    message.payloadlen = strlen(buf)+1;
+    rc = client.publish(topic, message); //Publsih data using MQTT client
+    logMessage("Publish rc: %d, Buf: %s\r\n", rc, buf);
+}
+
+void publish_field8(){ //Function to publish the values to ThingSpeak fields
+    static int last_update = -1;
+    if(TEMPERATURE == last_update)
+        return; //Ignore unncessary update in case no chnage in value.
+    last_update = TEMPERATURE;
+    logMessage("Publish Routine\r\n");
+    int rc = 0;
+    MQTT::Message message; 
+    char* topic = "channels/1608275/publish";//Topic contaning Channel ID
+    char buf[100]; //Buffer for storing data
+    sprintf(buf, "field8=%d&status=MQTTPUBLISH",TEMPERATURE);
+    message.qos = MQTT::QOS0; //MQTT QOS 0 used. Best effort QOS
+    message.retained = false;
+    message.dup = false;
+    message.payload = (void*)buf; //Copy buffer to Message Payload
+    message.payloadlen = strlen(buf)+1;
+    rc = client.publish(topic, message); //Publsih data using MQTT client
+    logMessage("Publish rc: %d, Buf: %s\r\n", rc, buf);
+}
+
+void publish_field7(){ //Function to publish the values to ThingSpeak fields
+    static int last_update = -1;
+    if(SMOKE_level == last_update)
+        return; //Ignore unncessary update in case no chnage in value.
+    last_update = SMOKE_level;
+    logMessage("Publish Routine\r\n");
+    int rc = 0;
+    MQTT::Message message; 
+    char* topic = "channels/1608275/publish";//Topic contaning Channel ID
+    char buf[100]; //Buffer for storing data
+    sprintf(buf, "field7=%d&status=MQTTPUBLISH",SMOKE_level);
+    message.qos = MQTT::QOS0; //MQTT QOS 0 used. Best effort QOS
+    message.retained = false;
+    message.dup = false;
+    message.payload = (void*)buf; //Copy buffer to Message Payload
+    message.payloadlen = strlen(buf)+1;
+    rc = client.publish(topic, message); //Publsih data using MQTT client
+    logMessage("Publish rc: %d, Buf: %s\r\n", rc, buf);
+}
 
 int main(int argc, char* argv[])
 {
+    smoke_detector.start_measurement(2); //Start periodic Smoke detector measurements at intervals of 10s
+   temperature.start_measurement(20); //Start periodic Temperaturre readings. At interval of 20s
+   water_pump.start_measurement(2); //Start Water Pump measurements. At intervals of 2s. This is small value because for test purpose very small tank is being used. In real life this could be in mins.
+   water_pump.pump_on(); //Start the pump for 1st time
     float version = 0.6;
-    char* topic = "mbed-sample";
-
     logMessage("HelloMQTT: version is %.2f\r\n", version);
-
-    NetworkInterface* network = easy_connect(true);
-    if (!network) {
+    int ret = 0;
+    
+    if (!network) { //Check if ethernet connection successful
         return -1;
     }
 
-    MQTTNetwork mqttNetwork(network);
-
-    MQTT::Client<MQTTNetwork, Countdown> client(mqttNetwork);
-
-    const char* hostname = "m2m.eclipse.org";
-    int port = 1883;
+    const char* hostname = "mqtt3.thingspeak.com"; //Thingspeak host name
+    int port = 1883; //MQTT default port number
     logMessage("Connecting to %s:%d\r\n", hostname, port);
-    int rc = mqttNetwork.connect(hostname, port);
+    int rc = mqttNetwork.connect(hostname, port); //Attempt to connect to MQTT host
     if (rc != 0)
-        logMessage("rc from TCP connect is %d\r\n", rc);
+        logMessage("rc- TCP connect: %d\r\n", rc);
 
-    MQTTPacket_connectData data = MQTTPacket_connectData_initializer;
-    data.MQTTVersion = 3;
-    data.clientID.cstring = "mbed-sample";
-    data.username.cstring = "testuser";
-    data.password.cstring = "testpassword";
-    if ((rc = client.connect(data)) != 0)
-        logMessage("rc from MQTT connect is %d\r\n", rc);
-
-    if ((rc = client.subscribe(topic, MQTT::QOS2, messageArrived)) != 0)
-        logMessage("rc from MQTT subscribe is %d\r\n", rc);
-
-    MQTT::Message message;
+    MQTTPacket_connectData data = MQTTPacket_connectData_initializer; //Build MQTT Client connection data
+    data.MQTTVersion = 3; //MQTT Version
+    data.clientID.cstring = "FA8KKzQ1CDY6EjENATYTESc"; //Thingspeak MQTT Client ID
+    data.username.cstring = "FA8KKzQ1CDY6EjENATYTESc";//Thingspeak MQTT Username
+    data.password.cstring = "vVdiiGscVIGLEgQIZ250Unxc";//Thingspeak MQTT Password
+    
+    
+    if ((rc = client.connect(data)) != 0) //Connect Client
+        logMessage("rc- connect: %d\r\n", rc);
+        
+    char* topic = "channels/1608275/subscribe/fields/field1"; //Subscribe for field1
+    if ((rc = client.subscribe(topic, MQTT::QOS0, field1_pump_state)) != 0)//Use field1_pump_state function pointer as call back function
+        logMessage("rc1: %d\r\n", rc);
+    
+    topic = "channels/1608275/subscribe/fields/field2";
+    if ((rc = client.subscribe(topic, MQTT::QOS0, field2_fan_state)) != 0)//Use field2_fan_state function pointer as call back function
+        logMessage("rc2: %d\r\n", rc);
 
-    // QoS 0
-    char buf[100];
-    sprintf(buf, "Hello World!  QoS 0 message from app version %f\r\n", version);
-    message.qos = MQTT::QOS0;
-    message.retained = false;
-    message.dup = false;
-    message.payload = (void*)buf;
-    message.payloadlen = strlen(buf)+1;
-    rc = client.publish(topic, message);
-    while (arrivedcount < 1)
-        client.yield(100);
-
-    // QoS 1
-    sprintf(buf, "Hello World!  QoS 1 message from app version %f\r\n", version);
-    message.qos = MQTT::QOS1;
-    message.payloadlen = strlen(buf)+1;
-    rc = client.publish(topic, message);
-    while (arrivedcount < 2)
-        client.yield(100);
-
-    // QoS 2
-    sprintf(buf, "Hello World!  QoS 2 message from app version %f\r\n", version);
-    message.qos = MQTT::QOS2;
-    message.payloadlen = strlen(buf)+1;
-    rc = client.publish(topic, message);
-    while (arrivedcount < 3)
-        client.yield(100);
-
+    topic = "channels/1608275/subscribe/fields/field3";
+    if ((rc = client.subscribe(topic, MQTT::QOS0, field3_alarm_state)) != 0)//Use field3_alarm_state function pointer as call back function
+        logMessage("rc: %d\r\n", rc);
+    
+    while (1){
+        logMessage("GAS: %d, CO: %d, Smoke: %d, TEMP = %0.1f, Water = %d", GAS_level, CO_level, SMOKE_level, TEMPERATURE, WATER_LEVEL);
+        //publish_field1();
+        //wait(1);
+        //publish_field2();
+        //wait(1);
+        //publish_field3();
+        //wait(1);
+        //publish_field4();
+        //wait(5);
+        //publish_field5();
+        //wait(5);
+        //publish_field5();
+        //wait(1);
+        //publish_field6();
+        //wait(1);
+        //publish_field7();
+        //wait(1);
+        //publish_field8();
+        client.yield(50);
+        //client.connect(data);
+    }
     if ((rc = client.unsubscribe(topic)) != 0)
         logMessage("rc from unsubscribe was %d\r\n", rc);
-
     if ((rc = client.disconnect()) != 0)
         logMessage("rc from disconnect was %d\r\n", rc);
-
     mqttNetwork.disconnect();
-
     logMessage("Version %.2f: finish %d msgs\r\n", version, arrivedcount);
-
     return 0;
 }