Initial

.gitignore

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+.pio

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:esp32dev]
+platform = espressif32
+board = esp32dev
+framework = arduino
+upload_speed = 460800
+
+; Custom CPU Frequency
+board_build.f_cpu = 240000000L
+board_build.f_flash = 40000000L
+
+; 16MB Flash
+board_build.partitions = default_16MB.csv

src/main.cpp

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+#include "Arduino.h"
+
+void setup() {
+    Serial.begin(115200);
+    Serial.print("FREE RAM: "); Serial.print(ESP.getFreeHeap()); Serial.println(" MB");
+
+    uint32_t ideSize = ESP.getFlashChipSize();
+    FlashMode_t ideMode = ESP.getFlashChipMode();
+
+    Serial.printf("Flash ide  size: %u bytes\n", ideSize);
+    Serial.printf("Flash ide speed: %u Hz\n", ESP.getFlashChipSpeed());
+    Serial.printf("Flash ide mode:  %s\n", (ideMode == FM_QIO ? "QIO" : ideMode == FM_QOUT ? "QOUT" : ideMode == FM_DIO ? "DIO" : ideMode == FM_DOUT ? "DOUT" : "UNKNOWN"));
+}
+
+void loop() {
+}

src/main.h

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+#ifndef MAIN_H
+#define MAIN_H
+#endif

src/wifi.cpp

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+#include "wifi.h"
+#include "main.h"
+
+WIFI::WIFI(void) {
+    // pinMode(WIFI_INDICATOR, OUTPUT);   
+}
+
+void WIFI::set_credential(char *ssid, char *passphrase) {
+    strcpy(WIFI::_ssid, ssid);
+    strcpy(WIFI::_passphrase, passphrase);
+
+    // Initial value
+    this->wifi_check_duration = 5000;
+}
+
+void WIFI::connect_wifi(void) {
+    if(strlen(WIFI::_ssid) == 0) {
+    //  Serial.println("(wifi) Empty SSID");
+        return;
+    }
+
+    if(WiFi.status() == WL_CONNECTED) {
+        WiFi.disconnect();
+    }
+
+    // WiFi.begin(this->_ssid, this->_passphrase);
+    WiFi.begin(WIFI::_ssid, WIFI::_passphrase);
+}
+
+bool WIFI::check_wifi(void) {
+    bool ret_val = false;
+
+    if(
+        (uint32_t)(millis() - last_wifi_check) > wifi_check_duration
+    ){
+        if(WiFi.status() != WL_CONNECTED) {
+            Serial.println(F("WiFi Connecting"));
+            WiFi.disconnect();
+
+            // GPIO.out_w1tc = ((uint32_t)1 << WIFI_INDICATOR);
+
+            // WiFi.begin(this->_ssid, this->_passphrase);
+            // Serial.print("(check_wifi)->SSID      : "); Serial.println(WIFI::_ssid);
+            // Serial.print("(check_wifi)->PASSPHRASE: "); Serial.println(WIFI::_passphrase);
+
+            WIFI::connect_wifi();
+            wifi_check_duration = 5000;
+            ret_val = false;
+        } else {
+            // GPIO.out_w1ts = ((uint32_t)1 << WIFI_INDICATOR);
+
+            Serial.println(F("WiFi OK"));
+
+            Serial.print(F("IP: "));
+            Serial.println(WiFi.localIP());
+            wifi_check_duration = 60000;
+            ret_val = true;
+        }
+
+        last_wifi_check = millis();
+    }
+
+    return ret_val;
+}
+
+bool WIFI::is_connected(void) {
+    if(WiFi.status() == WL_CONNECTED)
+        return true;
+    else
+        return false;
+}

src/wifi.h

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+#ifndef WIFI_H_
+#define WIFI_H_
+
+#include <Arduino.h>
+#include <WiFi.h>
+#include <WiFiClient.h>
+
+// #define WIFI_INDICATOR 2
+
+class WIFI {
+    public:
+        WIFI(void);
+        void set_credential(char *ssid, char *passphrase);
+        void connect_wifi(void);
+        bool check_wifi(void);
+        bool is_connected(void);
+        char _ssid[32], _passphrase[32];
+
+    private:
+        uint32_t last_wifi_check, wifi_check_duration;
+};
+
+#endif

test/README

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+
+This directory is intended for PlatformIO Unit Testing 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/page/plus/unit-testing.html