working ota example

.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:lolin32]
+platform = espressif32
+board = lolin32
+framework = arduino
+monitor_speed = 115200
+upload_speed = 921600

src/main.cpp

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+#include <Arduino.h>
+#include <WiFi.h>
+#include <ArduinoOTA.h>
+
+#define OTA_WIFI_SSID       "Chaos-West temp alternative"
+#define OTA_WIFI_PASSWORD   ""
+#define OTA_WAIT_TIMEOUT    1000     // in 0.1s increments -> 10s
+
+void normal_loop();
+void normal_setup();
+void checkOTA();
+bool initOTA();
+
+enum OTA_MODE {
+    NONE,
+    SEARCHING,
+    WAITING,
+    UPDATING
+} otaMode;
+
+uint16_t otaWaitCounter;
+
+void checkOTA() {
+    otaMode = SEARCHING;
+    Serial.println("looking for OTA WiFi...");
+    
+    // WARNING: to allow ESP-NOW work, this WiFi must be on Channel 1
+    if (OTA_WIFI_PASSWORD!="") {
+      WiFi.begin(OTA_WIFI_SSID, OTA_WIFI_PASSWORD); //wifi with password
+    }else{
+      WiFi.begin(OTA_WIFI_SSID); //open wifi
+    }
+
+    while (WiFi.waitForConnectResult() != WL_CONNECTED) {
+        Serial.println("no OTA WiFi found, proceed normal boot");
+        otaMode = NONE;
+        return;
+    }
+
+    otaMode = WAITING;
+}
+
+void normal_setup() {
+    Serial.println("Booting normal");
+
+    WiFi.disconnect();
+    WiFi.mode(WIFI_STA);
+    WiFi.disconnect();
+    Serial.printf("wifi channel: %d\n", WiFi.channel());
+
+}
+
+void setup() {
+    Serial.begin(115200);
+
+    delay(1000);
+
+    Serial.println();
+    Serial.println("Initializing...");
+
+
+    checkOTA();
+    if(!initOTA()) { //initialize ota when ota enabled
+        normal_setup();
+    }
+}
+
+bool initOTA() {
+  if (otaMode == WAITING) {
+    Serial.println("connected to OTA WiFi. Waiting for firmware...");
+    Serial.print("IP address: ");
+    Serial.println(WiFi.localIP());
+
+    ArduinoOTA
+            .onStart([]() {
+                otaMode = UPDATING;
+                String type;
+                if (ArduinoOTA.getCommand() == U_FLASH)
+                    type = "sketch";
+                else // U_SPIFFS
+                    type = "filesystem";
+
+                // NOTE: if updating SPIFFS this would be the place to unmount SPIFFS using SPIFFS.end()
+                Serial.println("Start updating " + type);
+            })
+            .onEnd([]() {
+                Serial.println("\nEnd");
+            })
+            .onProgress([](unsigned int progress, unsigned int total) {
+                int prog = (progress / (total / 100));
+                Serial.printf("Progress: %u%%\r", prog);
+
+            })
+            .onError([](ota_error_t error) {
+                Serial.printf("Error[%u]: ", error);
+                if (error == OTA_AUTH_ERROR) Serial.println("Auth Failed");
+                else if (error == OTA_BEGIN_ERROR) Serial.println("Begin Failed");
+                else if (error == OTA_CONNECT_ERROR) Serial.println("Connect Failed");
+                else if (error == OTA_RECEIVE_ERROR) Serial.println("Receive Failed");
+                else if (error == OTA_END_ERROR) Serial.println("End Failed");
+            });
+
+    ArduinoOTA.begin();
+    return 1; //ota ok
+  }else{
+    return 0; //not using ota
+  }
+}
+
+
+void loop() {
+
+    if (otaMode != NONE) {
+        ArduinoOTA.handle();
+
+        if(otaMode == WAITING) {
+            static long mil = millis();
+            static boolean huehott = false;
+
+            if(millis() - mil > 100) {
+                huehott = !huehott;
+                mil = millis();
+
+                otaWaitCounter++;
+                if(otaWaitCounter >= OTA_WAIT_TIMEOUT) {
+                    Serial.println("OTA wait timeout, proceeding normal boot");
+                    otaMode = NONE;
+                    normal_setup();
+                }
+            }
+        }
+
+    } else {
+      normal_loop();    
+        
+    }
+}
+
+void normal_loop() {
+  static unsigned long last_print=0;
+  if (millis()-last_print>1000) {
+    last_print=millis();
+    Serial.println("Loop");
+  } 
+}

test/README

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+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html