Add OTA update feature

This sketch provide functionality for OTA firmware upgrade.

CMakeLists.txt

@@ -60,6 +60,7 @@ set(LIBRARY_SRCS
   libraries/SPI/src/SPI.cpp
   libraries/Ticker/src/Ticker.cpp
   libraries/Update/src/Updater.cpp
+  libraries/Update/src/HttpsOTAUpdate.cpp
   libraries/WebServer/src/WebServer.cpp
   libraries/WebServer/src/Parsing.cpp
   libraries/WebServer/src/detail/mimetable.cpp

libraries/Update/examples/HTTPS_OTA_Update/HTTPS_OTA_Update.ino

@@ -0,0 +1,98 @@
+// This sketch provide the functionality of OTA Firmware Upgrade
+#include "WiFi.h"
+#include "HttpsOTAUpdate.h"
+// This sketch shows how to implement HTTPS firmware update Over The Air.
+// Please provide your WiFi credentials, https URL to the firmware image and the server certificate.
+
+static const char *ssid     = "your-ssid";  // your network SSID (name of wifi network)
+static const char *password = "your-password"; // your network password
+
+static const char *url = "https://example.com/firmware.bin"; //state url of your firmware image
+
+static const char *server_certificate = "-----BEGIN CERTIFICATE-----\n" \
+     "MIIEkjCCA3qgAwIBAgIQCgFBQgAAAVOFc2oLheynCDANBgkqhkiG9w0BAQsFADA/\n" \
+     "MSQwIgYDVQQKExtEaWdpdGFsIFNpZ25hdHVyZSBUcnVzdCBDby4xFzAVBgNVBAMT\n" \
+     "DkRTVCBSb290IENBIFgzMB4XDTE2MDMxNzE2NDA0NloXDTIxMDMxNzE2NDA0Nlow\n" \
+     "SjELMAkGA1UEBhMCVVMxFjAUBgNVBAoTDUxldCdzIEVuY3J5cHQxIzAhBgNVBAMT\n" \
+     "GkxldCdzIEVuY3J5cHQgQXV0aG9yaXR5IFgzMIIBIjANBgkqhkiG9w0BAQEFAAOC\n" \
+     "AQ8AMIIBCgKCAQEAnNMM8FrlLke3cl03g7NoYzDq1zUmGSXhvb418XCSL7e4S0EF\n" \
+     "q6meNQhY7LEqxGiHC6PjdeTm86dicbp5gWAf15Gan/PQeGdxyGkOlZHP/uaZ6WA8\n" \
+     "SMx+yk13EiSdRxta67nsHjcAHJyse6cF6s5K671B5TaYucv9bTyWaN8jKkKQDIZ0\n" \
+     "Z8h/pZq4UmEUEz9l6YKHy9v6Dlb2honzhT+Xhq+w3Brvaw2VFn3EK6BlspkENnWA\n" \
+     "a6xK8xuQSXgvopZPKiAlKQTGdMDQMc2PMTiVFrqoM7hD8bEfwzB/onkxEz0tNvjj\n" \
+     "/PIzark5McWvxI0NHWQWM6r6hCm21AvA2H3DkwIDAQABo4IBfTCCAXkwEgYDVR0T\n" \
+     "AQH/BAgwBgEB/wIBADAOBgNVHQ8BAf8EBAMCAYYwfwYIKwYBBQUHAQEEczBxMDIG\n" \
+     "CCsGAQUFBzABhiZodHRwOi8vaXNyZy50cnVzdGlkLm9jc3AuaWRlbnRydXN0LmNv\n" \
+     "bTA7BggrBgEFBQcwAoYvaHR0cDovL2FwcHMuaWRlbnRydXN0LmNvbS9yb290cy9k\n" \
+     "c3Ryb290Y2F4My5wN2MwHwYDVR0jBBgwFoAUxKexpHsscfrb4UuQdf/EFWCFiRAw\n" \
+     "VAYDVR0gBE0wSzAIBgZngQwBAgEwPwYLKwYBBAGC3xMBAQEwMDAuBggrBgEFBQcC\n" \
+     "ARYiaHR0cDovL2Nwcy5yb290LXgxLmxldHNlbmNyeXB0Lm9yZzA8BgNVHR8ENTAz\n" \
+     "MDGgL6AthitodHRwOi8vY3JsLmlkZW50cnVzdC5jb20vRFNUUk9PVENBWDNDUkwu\n" \
+     "Y3JsMB0GA1UdDgQWBBSoSmpjBH3duubRObemRWXv86jsoTANBgkqhkiG9w0BAQsF\n" \
+     "AAOCAQEA3TPXEfNjWDjdGBX7CVW+dla5cEilaUcne8IkCJLxWh9KEik3JHRRHGJo\n" \
+     "uM2VcGfl96S8TihRzZvoroed6ti6WqEBmtzw3Wodatg+VyOeph4EYpr/1wXKtx8/\n" \
+     "wApIvJSwtmVi4MFU5aMqrSDE6ea73Mj2tcMyo5jMd6jmeWUHK8so/joWUoHOUgwu\n" \
+     "X4Po1QYz+3dszkDqMp4fklxBwXRsW10KXzPMTZ+sOPAveyxindmjkW8lGy+QsRlG\n" \
+     "PfZ+G6Z6h7mjem0Y+iWlkYcV4PIWL1iwBi8saCbGS5jN2p8M+X+Q7UNKEkROb3N6\n" \
+     "KOqkqm57TH2H3eDJAkSnh6/DNFu0Qg==\n" \
+     "-----END CERTIFICATE-----";
+
+static HttpsOTAStatus_t otastatus;
+
+void HttpEvent(HttpEvent_t *event)
+{
+    switch(event->event_id) {
+        case HTTP_EVENT_ERROR:
+            Serial.println("Http Event Error");
+            break;
+        case HTTP_EVENT_ON_CONNECTED:
+            Serial.println("Http Event On Connected");
+            break;
+        case HTTP_EVENT_HEADER_SENT:
+            Serial.println("Http Event Header Sent");
+            break;
+        case HTTP_EVENT_ON_HEADER:
+            Serial.printf("Http Event On Header, key=%s, value=%s\n", event->header_key, event->header_value);
+            break;
+        case HTTP_EVENT_ON_DATA:
+            break;
+        case HTTP_EVENT_ON_FINISH:
+            Serial.println("Http Event On Finish");
+            break;
+        case HTTP_EVENT_DISCONNECTED:
+            Serial.println("Http Event Disconnected");
+            break;
+    }
+}
+
+void setup(){
+
+    Serial.begin(115200);
+    Serial.print("Attempting to connect to SSID: ");
+    WiFi.begin(ssid, password);
+
+    // attempt to connect to Wifi network:
+    while (WiFi.status() != WL_CONNECTED) {
+        Serial.print(".");
+        delay(1000);
+    }
+
+    Serial.print("Connected to ");
+    Serial.println(ssid);
+    
+    HttpsOTA.onHttpEvent(HttpEvent);
+    Serial.println("Starting OTA");
+    HttpsOTA.begin(url, server_certificate); 
+
+    Serial.println("Please Wait it takes some time ...");
+}
+
+void loop(){
+    otastatus = HttpsOTA.status();
+    if(otastatus == HTTPS_OTA_SUCCESS) { 
+        Serial.println("Firmware written successfully. To reboot device, call API ESP.restart() or PUSH restart button on device");
+    } else if(otastatus == HTTPS_OTA_FAIL) { 
+        Serial.println("Firmware Upgrade Fail");
+    }
+    delay(1000);
+}

libraries/Update/examples/HTTPS_OTA_Update/Readme.md

@@ -0,0 +1,32 @@
+# OTA Firmware Upgrade for Arduino
+This sketch allows Arduino user to perform Over The Air (OTA) firmware upgrade. It uses HTTPS.
+ 
+# API introduced for OTA
+
+## HttpsOTA.begin(const char * url, const char * server_certificate, bool skip_cert_common_name_check) 
+
+Main API which starts firmware upgrade
+
+### Parameters
+* url : URL for the uploaded firmware image
+* server_certificate : Provide the ota server certificate for authentication via HTTPS
+* skip_cert_common_name_check : Skip any validation of server certificate CN field 
+
+The default value provided to skip_cert_common_name_check is true
+
+## HttpsOTA.onHttpEvent(function)
+
+This API exposes HTTP Events to the user
+
+### Parameter
+Function passed has following signature 
+void HttpEvent (HttpEvent_t * event);
+
+# HttpsOTA.otaStatus()
+
+It tracks the progress of OTA firmware upgrade.
+* HTTPS_OTA_IDLE : OTA upgrade have not started yet.
+* HTTPS_OTA_UPDATNG : OTA upgarde is in progress.
+* HTTPS_OTA_SUCCESS : OTA upgrade is successful.
+* HTTPS_OTA_FAIL : OTA upgrade failed.
+* HTTPS_OTA_ERR : Error occured while creating xEventGroup().

libraries/Update/src/HttpsOTAUpdate.cpp

@@ -0,0 +1,107 @@
+/* OTA task
+
+   This example code is in the Public Domain (or CC0 licensed, at your option.)
+
+   Unless required by applicable law or agreed to in writing, this
+   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+   CONDITIONS OF ANY KIND, either express or implied.
+*/
+#include <stdio.h>
+#include <string.h>
+
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+
+#include "esp32-hal-log.h"
+#include "esp_http_client.h"
+#include "esp_https_ota.h"
+
+#include "HttpsOTAUpdate.h"
+#include "Esp.h"
+#define OTA_TASK_STACK_SIZE 9216
+
+typedef void (*HttpEventCb)(HttpEvent_t*);
+
+static esp_http_client_config_t config; 
+static HttpEventCb cb;
+static EventGroupHandle_t ota_status = NULL;//check for ota status
+static EventBits_t set_bit;
+
+const int OTA_IDLE_BIT = BIT0;
+const int OTA_UPDATING_BIT = BIT1;
+const int OTA_SUCCESS_BIT = BIT2;
+const int OTA_FAIL_BIT = BIT3;
+
+esp_err_t http_event_handler(esp_http_client_event_t *event)
+{
+    cb(event); 
+    return ESP_OK;
+}
+
+void https_ota_task(void *param)
+{
+    if(ota_status) {
+        xEventGroupSetBits(ota_status, OTA_UPDATING_BIT);
+        xEventGroupClearBits(ota_status, OTA_IDLE_BIT);
+    }
+    esp_err_t ret = esp_https_ota((const esp_http_client_config_t *)param);
+    if(ret == ESP_OK) {
+        if(ota_status) {
+            xEventGroupClearBits(ota_status, OTA_UPDATING_BIT);
+            xEventGroupSetBits(ota_status, OTA_SUCCESS_BIT);
+        }
+    } else {
+        if(ota_status) {  
+            xEventGroupClearBits(ota_status, OTA_UPDATING_BIT);
+            xEventGroupSetBits(ota_status, OTA_FAIL_BIT);
+        }
+    }
+    vTaskDelete(NULL);
+}
+
+HttpsOTAStatus_t HttpsOTAUpdateClass::status()
+{
+    if(ota_status) {     
+        set_bit =  xEventGroupGetBits(ota_status);
+        if(set_bit == OTA_IDLE_BIT) {
+            return HTTPS_OTA_IDLE;
+        }
+        if(set_bit == OTA_UPDATING_BIT) {
+            return HTTPS_OTA_UPDATING;
+        }
+        if(set_bit == OTA_SUCCESS_BIT) {
+            return HTTPS_OTA_SUCCESS;
+        }
+        if(set_bit == OTA_FAIL_BIT) {
+            return HTTPS_OTA_FAIL;
+        }
+    }
+    return HTTPS_OTA_ERR;
+}
+
+void HttpsOTAUpdateClass::onHttpEvent(HttpEventCb cbEvent)
+{
+    cb = cbEvent;
+}
+
+void HttpsOTAUpdateClass::begin(const char *url, const char *cert_pem, bool skip_cert_common_name_check)
+{
+    config.url = url;
+    config.cert_pem = cert_pem; 
+    config.skip_cert_common_name_check = skip_cert_common_name_check;
+    config.event_handler = http_event_handler;
+
+    if(!ota_status) {
+        ota_status = xEventGroupCreate();
+        if(!ota_status) {
+            log_e("OTA Event Group Create Failed");
+        }
+        xEventGroupSetBits(ota_status, OTA_IDLE_BIT);
+    }
+ 
+    if (xTaskCreate(&https_ota_task, "https_ota_task", OTA_TASK_STACK_SIZE, &config, 5, NULL) != pdPASS) {
+        log_e("Couldn't create ota task\n"); 
+    }
+}
+
+HttpsOTAUpdateClass HttpsOTA;

libraries/Update/src/HttpsOTAUpdate.h

@@ -0,0 +1,21 @@
+#include "esp_http_client.h"
+#define HttpEvent_t esp_http_client_event_t
+
+typedef enum
+{
+    HTTPS_OTA_IDLE,
+    HTTPS_OTA_UPDATING,
+    HTTPS_OTA_SUCCESS,
+    HTTPS_OTA_FAIL,
+    HTTPS_OTA_ERR
+}HttpsOTAStatus_t;
+
+class HttpsOTAUpdateClass {
+
+    public:
+    void begin(const char *url, const char *cert_pem, bool skip_cert_common_name_check = true);
+    void onHttpEvent(void (*http_event_cb_t)(HttpEvent_t *));
+    HttpsOTAStatus_t status();
+};
+
+extern HttpsOTAUpdateClass HttpsOTA;