From 004868ef6563535e0b5429ff5e6f589f679fe959 Mon Sep 17 00:00:00 2001
From: Hendrik Langer <hendrik+dev@xd0.de>
Date: Sat, 16 Jun 2018 13:17:12 +0200
Subject: [PATCH] insert ota example

---
 src/XD0OTA.cpp | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++
 src/XD0OTA.h   | 53 ++++++++++++++++++++++++++++++++
 2 files changed, 135 insertions(+)
 create mode 100644 src/XD0OTA.cpp
 create mode 100644 src/XD0OTA.h

diff --git a/src/XD0OTA.cpp b/src/XD0OTA.cpp
new file mode 100644
index 0000000..565dbc7
--- /dev/null
+++ b/src/XD0OTA.cpp
@@ -0,0 +1,82 @@
+#include "XD0OTA.h"
+
+XD0OTA::XD0OTA() {
+
+}
+
+String XD0OTA::getMAC() {
+  uint8_t mac[6];
+  char result[14];
+
+  WiFi.macAddress( mac );
+  snprintf( result, sizeof( result ), "%02x%02x%02x%02x%02x%02x", mac[ 0 ], mac[ 1 ], mac[ 2 ], mac[ 3 ], mac[ 4 ], mac[ 5 ] );
+
+  return String( result );
+}
+
+void XD0OTA::update(void) {
+
+  int newVersion = checkForUpdates();
+
+  if( newVersion > FW_VERSION ) {
+    Serial.println( "Preparing to update." );
+
+    String mac = getMAC();
+    String fwURL = String( fwUrlBase );
+    fwURL.concat( mac );
+    String fwImageURL = fwURL;
+    fwImageURL.concat( ".bin" );
+
+    t_httpUpdate_return ret = ESPhttpUpdate.update( fwImageURL );
+
+    switch(ret) {
+        case HTTP_UPDATE_FAILED:
+            Serial.printf("HTTP_UPDATE_FAILED Error (%d): %s",  ESPhttpUpdate.getLastError(), ESPhttpUpdate.getLastErrorString().c_str());
+            break;
+        case HTTP_UPDATE_NO_UPDATES:
+            Serial.println("HTTP_UPDATE_NO_UPDATES");
+            break;
+        case HTTP_UPDATE_OK:
+            Serial.println("[update] Update ok."); // may not called we reboot the ESP
+            break;
+    }
+  } else {
+    Serial.println( "Already on latest version" );
+  }
+}
+
+int XD0OTA::checkForUpdates() {
+  int newVersion = -1;
+
+  String mac = getMAC();
+  String fwURL = String( fwUrlBase );
+  fwURL.concat( mac );
+  String fwVersionURL = fwURL;
+  fwVersionURL.concat( ".version" );
+
+  Serial.println( "Checking for firmware updates." );
+  Serial.print( "MAC address: " );
+  Serial.println( mac );
+  Serial.print( "Firmware version URL: " );
+  Serial.println( fwVersionURL );
+
+  HTTPClient httpClient;
+  httpClient.begin( fwVersionURL );
+  int httpCode = httpClient.GET();
+  if( httpCode == 200 ) {
+    String newFWVersion = httpClient.getString();
+
+    Serial.print( "Current firmware version: " );
+    Serial.println( FW_VERSION );
+    Serial.print( "Available firmware version: " );
+    Serial.println( newFWVersion );
+
+    newVersion = newFWVersion.toInt();
+  } else {
+    Serial.print( "Firmware version check failed, got HTTP response code " );
+    Serial.println( httpCode );
+    newVersion = -1;
+  }
+  httpClient.end();
+  return newVersion;
+}
diff --git a/src/XD0OTA.h b/src/XD0OTA.h
new file mode 100644
index 0000000..ac9f137
--- /dev/null
+++ b/src/XD0OTA.h
@@ -0,0 +1,53 @@
+#ifndef _XD0OTA_H
+#define _XD0OTA_H
+
+#include <Arduino.h>
+
+#include <ESP8266HTTPClient.h>
+#include <ESP8266httpUpdate.h>
+
+const int FW_VERSION = 10;
+const char* httpsFingerprint = "37 42 61 B9 E6 EE 22 36 D1 59 67 7D 55 53 6E A4 C7 AA 60 26";
+
+class XD0OTA {
+  public:
+    XD0OTA();
+    void update(void);
+    int checkForUpdates();
+  private:
+    const char* fwUrlBase = "https://fwupdate.xd0.de/fota/";
+    String getMAC();
+};
+
+#endif /* _XD0OTA_H */
+
+
+/*
+
+openssl req -x509 -nodes -days 18263 -newkey rsa:2048 -keyout /etc/ssl/private/xd0-fwupdate-selfsigned.key -out /etc/ssl/certs/xd0-fwupdate-selfsigned.crt
+
+openssl x509 -noout -fingerprint -sha1 -inform pem -in /etc/ssl/certs/xd0-fwupdate-selfsigned.crt
+
+
+server {
+    listen 443 ssl;
+    listen [::]:443 ssl;
+    server_name fwupdate.xd0.de;
+
+    # SSL configuration
+    ssl_certificate /etc/ssl/certs/xd0-fwupdate-selfsigned.crt;
+    ssl_certificate_key /etc/ssl/private/xd0-fwupdate-selfsigned.key;
+
+    root /var/www/fwupdate;
+
+    location / {
+        # First attempt to serve request as file, then
+        # as directory, then fall back to displaying a 404.
+        try_files $uri $uri/ =404;
+    }
+
+    access_log      /var/log/nginx/fwupdate_access.log;
+    error_log       /var/log/nginx/fwupdate_error.log;
+}
+
+*/