Implemented HTTP Server OTA (website based OTA)

With http server based ota user can update firmware over internet (no
need to connect to same wifi network). You can now easily update
firmware anywhere without having physical acess to esp8266 board.

Author: pkarun

Blynk-PZEM-004T-Phase-Failure-Automation/Blynk-PZEM-004T-Phase-Failure-Automation.ino

@@ -39,8 +39,11 @@
 #include <ModbusMaster.h>
 #include <ESP8266WiFi.h>
 
-
+#include <ESP8266HTTPClient.h>
+#include <ESP8266httpUpdate.h> 
+ 
 #include <SoftwareSerial.h>                                   //(NODEMCU ESP8266)
+
 SoftwareSerial pzemSerial(RX_PIN_NODEMCU, TX_PIN_NODEMCU);    //(RX,TX) NodeMCU connect to (TX,RX) of PZEM
 
 /*
@@ -111,6 +114,8 @@ int auto_mode_state_1       = HIGH;
 int ReCnctFlag;               // Reconnection Flag
 int ReCnctCount = 0;          // Reconnection counter
 
+int firmwarestate = HIGH;     // Used for firmware update process
+
 void setup()
 {
   Serial.begin(115200);
@@ -200,7 +205,7 @@ void setup()
   timer.setInterval(AUTO_MODE_TIME,           auto_mode);    
   timer.setInterval(PHYSICAL_BUTTON_TIME,     checkPhysicalButton);             // Setup a Relay function to be called every 100 ms
   timer.setInterval(SEND_TO_BLYNK_TIME,       sendtoBlynk);                     // Send PZEM values blynk server every 10 sec
-} 
+ } 
 
 void sendtoBlynk()                                                           // Here we are sending PZEM data to blynk
 {
@@ -234,7 +239,9 @@ void sendtoBlynk()                                                           //
   Blynk.virtualWrite(vPIN_SUM_ACTIVE_ENERGY,       sum_of_active_energy);
   Blynk.virtualWrite(vPIN_SUM_FREQUENCY,           sum_of_frequency);
   Blynk.virtualWrite(vPIN_SUM_POWER_FACTOR,        sum_of_power_factor);
-  }
+
+  Blynk.virtualWrite(VPIN_FIRMWARE_VERSION,        FIRMWARE_VERSION);  
+}
 
 void pzemdevice1()                                                            // Function to get PZEM device 1 data
 {
@@ -461,13 +468,9 @@ BLYNK_CONNECTED() {                                           // Every time we c
   Blynk.syncVirtual(VPIN_BUTTON_3);
   Blynk.syncVirtual(VPIN_BUTTON_4);
   Blynk.syncVirtual(VPIN_AUTO_MODE_BUTTON_1);
-
-  /*  Alternatively, you could override server state using:
-    Blynk.virtualWrite(VPIN_BUTTON_1, relay1State);
-    Blynk.virtualWrite(VPIN_BUTTON_2, relay2State);
-    Blynk.virtualWrite(VPIN_BUTTON_3, relay3State);
-    Blynk.virtualWrite(VPIN_BUTTON_4, relay4State);
-  */
+  
+  Blynk.virtualWrite(VPIN_UPDATE_LED,         0);             // Turn off FOTA Led
+  Blynk.virtualWrite(VPIN_FIRMWARE_UPDATE, HIGH);             // Turn off Firmware update button on app
 }
 
 /* When App button is pushed - switch the state */
@@ -491,6 +494,12 @@ BLYNK_WRITE(VPIN_BUTTON_4) {
 BLYNK_WRITE(VPIN_AUTO_MODE_BUTTON_1) {                      // Get auto mode button status value
   auto_mode_state_1 = param.asInt();
 }
+BLYNK_WRITE(VPIN_FIRMWARE_UPDATE) {                         // Get update button enabled or not
+  firmwarestate = param.asInt();  
+  if(firmwarestate == LOW){
+    checkforupdate();
+     }
+}
 
 void checkPhysicalButton()                                  // Here we are going to check push button pressed or not and change relay state
 {
@@ -567,7 +576,7 @@ void get_pzem_data()                                          // Function to che
     pzemdevice2();
     pzemdevice3();
     sumofpzem();
-  }
+}
 
 void swith_off()                                        // Function to check if voltage low condition occurs if occurs, switch off relays
 {
@@ -599,6 +608,43 @@ void auto_mode()                                      // Function to check if au
     Serial.println("RELAY 2 Turned ON");  
   }
 }
+  
+void checkforupdate()
+{ 
+  Serial.println( "OTA Update Request Received" );
+  Serial.print( "Firmware URL: " );
+  Serial.println( FIRMWARE_URL );
+
+  HTTPClient httpClient;
+  httpClient.begin( FIRMWARE_URL );
+  int httpCode = httpClient.GET();
+  if( httpCode == 200 ) {
+  Serial.println( "Update file found, starting update" );
+  Blynk.virtualWrite(VPIN_UPDATE_LED, 1023);
+  
+  t_httpUpdate_return ret = ESPhttpUpdate.update( FIRMWARE_URL );
+   
+  switch(ret) {
+    case HTTP_UPDATE_FAILED:
+        Serial.println("[update] Update failed.");
+        break;
+    case HTTP_UPDATE_NO_UPDATES:
+        Serial.println("[update] Update no Update.");
+        break;
+    case HTTP_UPDATE_OK:
+        Serial.println("[update] Update ok."); // may not called we reboot the ESP
+        break;
+              }
+           }  else {
+    Serial.print( "Firmware check failed, got HTTP response code " );
+    Serial.println( httpCode );
+           }
+  httpClient.end();
+  
+  Blynk.virtualWrite(VPIN_UPDATE_LED, 0);
+  Blynk.virtualWrite(VPIN_FIRMWARE_UPDATE, HIGH);
+  
+}
 
 void loop()
 {

Blynk-PZEM-004T-Phase-Failure-Automation/secret.h

@@ -24,3 +24,5 @@
 #define SERVER "xxx.xxx.xx.xxx"                                 // Comment-out if use Blynk hosted cloud service
 
 #define PORT 8080
+
+#define FIRMWARE_URL "http://example.com/Blynk-PZEM-004T-Phase-Failure-Automation.ino.nodemcu.bin"        // Enter the firmware URL location. Only http Protocol is supported. https not supported. Used for FOTA

Blynk-PZEM-004T-Phase-Failure-Automation/settings.h

@@ -2,6 +2,7 @@
 //                           Settings                          //
 /////////////////////////////////////////////////////////////////
 
+#define FIRMWARE_VERSION      02.01               // Version number. Increase each version by 1 number. Used for FOTA
 
 /***************************************************
           NodeMCU Pin Assignment
@@ -36,7 +37,7 @@
 How often you would like to call function? Enter time in milliseconds  
  **************************************************/
 
-#define GET_PZEM_DATA_TIME          1000L                       // How often you wish to get PZEM data. Enter time in milliseconds 
+#define GET_PZEM_DATA_TIME          2000L                       // How often you wish to get PZEM data. Enter time in milliseconds 
 #define SEND_TO_BLYNK_TIME          1000L                       // How often you would like to send data to blynk app. Enter time in milliseconds  
 #define AUTO_MODE_TIME              20000L
 #define PHYSICAL_BUTTON_TIME        500L
@@ -61,6 +62,9 @@ How often you would like to call function? Enter time in milliseconds
 #define VPIN_BUTTON_4                 V4
 
 #define VPIN_AUTO_MODE_BUTTON_1       V5                     // This button is to switch on motor in auto mode
+#define VPIN_FIRMWARE_UPDATE          V6
+#define VPIN_FIRMWARE_VERSION         V7
+#define VPIN_UPDATE_LED               V8
 
 /* Blynk Labeled Value vpin */