initialize a multitasking framework

.gitignore

@@ -1,55 +1,8 @@
-# Prerequisites
+# PlatformIO
-*.d
+.pio
 
-# Object files
+# VSCodium / VS Code
-*.o
+.vscode/.browse.c_cpp.db*
-*.ko
+.vscode/c_cpp_properties.json
-*.obj
+.vscode/launch.json
-*.elf
+.vscode/ipch
-
-# Linker output
-*.ilk
-*.map
-*.exp
-
-# Precompiled Headers
-*.gch
-*.pch
-
-# Libraries
-*.lib
-*.a
-*.la
-*.lo
-
-# Shared objects (inc. Windows DLLs)
-*.dll
-*.so
-*.so.*
-*.dylib
-
-# Executables
-*.exe
-*.out
-*.app
-*.i*86
-*.x86_64
-*.hex
-
-# Debug files
-*.dSYM/
-*.su
-*.idb
-*.pdb
-
-# Kernel Module Compile Results
-*.mod*
-*.cmd
-.tmp_versions/
-modules.order
-Module.symvers
-Mkfile.old
-dkms.conf
-
-# debug information files
-*.dwo

CMakeLists.txt

@@ -0,0 +1,3 @@
+cmake_minimum_required(VERSION 3.16.0)
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(FoxMesh)

docs/developers/010_ide_installation.md

@@ -0,0 +1,78 @@
+# Developer´s Installation with PlatformIO
+
+## Installation of VSCodium (Visual Studio Code)
+
+I prefer the installation of VSCodium, it is an excellent, privacy-focused alternative to Microsoft Visual Studio (VS Code) as it completely eliminatess telemtry, tracking, and proprietary Microsoft licenses.
+
+However, setting up VSCodium with PlatformIO introduces a major technical hurdle:
+Microsoft explicitly restricts the use of its official C/C++ extension (ms-vscode.cpptools) to official Microsoft product distributions.
+Because PlatformIO relies heavily on this extension for code completion, debugging, and naviagation, you cannot simply download everything directly from VSCodium's default extension marketplace.
+
+The following guide walks you through the proven workflows to successfully install and run PlatformIO on VSCodium.
+
+## Method 1: Manual Extension Installation (Recommended for Privacy)
+This method keeps your VSCodium completely decoupled from Microsoft's marketplace servers by manually sideloading the extension files (.vsix).
+
+### 1. Check System Prerequisites
+
+Ensure **Python 3** and **Git** are installed on your system.
+PlatformIO uses them under the hood to manage libraries and compile code.
+
+* Linux Users: You must also install the `python3-venv` packatge via your package manager (e.g. `sudo apt install python3-venv`).
+On **Arch Linux** the core `python` package (installed via `sudo pacman -S python`) **already includes the standard libryre `venv` module by default**.
+
+### 2. Download the Required Extensions
+
+Because of license restrictions, the required versions are not available on VSCodium's default *Open-VSX* registry.
+You need to grap them from the official Visual Studio Marketplace:
+
+1. Go to the Microsoft C/C++ Extension Page.
+On the right-hand side under *Resources*, click **Download Extensions** to save the `.vsix` file.
+
+2. Go to the PlatformIO IDE Extension Page and download its `.vsix` file as well.
+
+### 3. Sideload into VSCodium
+
+1. Open VSCodium.
+
+2. Click on the **Extension** icon in the left Activity Bar (or press `Ctrl+Shift+X` / `Cmd+Shift+X`).
+
+3. Click the `three dots (...)` at the top right of the Extensions view.
+
+4. Select and install the C/C++ Tools `.vsix` file first.
+
+5. Repeat the process to install the PlatformIO IDE `.vsix` file.
+
+### 4. Initialize PlatformIO Core
+
+1. **Restart VSCodium** completely after both installations finish.
+
+2. Upon restarting, PlatformIO will automatically start installing the **PlatformIO Core** framework in the background.
+This may take a few minutes depending on your internet connection.
+
+3. Once completed, you will see the iconic **PlatformIO Alien/Ant icon** appear in your left sidebar.
+
+## Method 2: Switching to the Microsoft Marketplace (Easier Updates)
+
+If you prefer a seamless one-click installation and automatic updates directly inside VSCodium, you can modify VSCodium's configuration to pull extensions directly from Microsoft's official marketplace instead of Open-VSX.
+
+*Note: This connects your editor to Microsoft's gallery infrastructure, which slightly reduces the strict "no-Microsoft-servers" privacy model of VSCodium.*
+
+1. Locate and open the product.json file for your VSCodium installation.
+
+	• Windows: %APPDATA%\VSCodium or inside the installation directory.
+	• Linux: /usr/share/vscodium/resources/app/product.json (requires root privileges to edit) or inside your Flatpak/Snap path.
+	• macOS: /Applications/VSCodium.app/Contents/Resources/app/product.json.
+
+2. Look for the extensionsGallery block and replace it with the following configuration:
+```json
+json
+"extensionsGallery": {
+    "serviceUrl": "https://visualstudio.com",
+    "itemUrl": "https://visualstudio.com"
+}
+```
+
+3. Save the file and restart VSCodium.
+
+4. You can now simply search for PlatformIO IDE and C/C++ in the Extensions tab and click Install.

docs/developers/020_new_project.md

@@ -0,0 +1,19 @@
+# Create New Project
+
+## PlatformIO
+
+1. Open VSCodium.
+
+2. Click on the **Alien Head** (ant head) icon of the PlatformIO in the left Activity bar.
+Continue clicking on "Create New Project", PlatformIO Core -- **PIO Home** opens.
+
+3. Again, press the button **+ New Project** and fill in the *Name* of the new project, e.g. `FoxMesh`.
+
+4. Select the board `TTGO LoRa32-OLED v2.1.6`
+
+5. Choose the Framework either `Arduino` or `Espidf`, we select `Espidf` i.e. **ESP-IDF**.
+
+6. We do not use the default location but `$HOME/github/FoxMesh`.
+
+
+

include/README

@@ -0,0 +1,37 @@
+
+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 convention is to give header files names that end with `.h'.
+
+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

@@ -0,0 +1,46 @@
+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into the executable file.
+
+The source code of each library should be placed in a separate directory
+("lib/your_library_name/[Code]").
+
+For example, see the structure of the following example libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional. for 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
+
+Example contents of `src/main.c` using Foo and Bar:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+The PlatformIO Library Dependency Finder will find automatically dependent
+libraries by scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

platformio.ini

@@ -0,0 +1,33 @@
+; 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
+
+[platformio]
+; Enable global PlatformIO Cache
+build_cache_dir = ~/.platformio/.cache
+
+[env:ttgo-lora32-v21]
+platform = espressif32
+board = ttgo-lora32-v21
+framework = espidf
+monitor_speed = 115200
+monitor_filters = esp32_exception_decoder
+; lib_deps = bodmer/TFT_eSPI@^2.5.43
+
+; Zwingt PlatformIO, die mit Core 6.2.0 kompatible SCons-Version zu nutzen
+platform_packages =
+    platformio/tool-scons @ ~4.41101.0
+
+; Hardware-specific macro definitions
+build_flags =
+    ;-D CONFIG_IDF_TARGET_ESP32=y
+    -D CCACHE_ENABLE=1
+
+; upload_port = /dev/ttyUSB0
+; monitor_port = /dev/ttyUSB0

src/CMakeLists.txt

@@ -0,0 +1,6 @@
+# This file was automatically generated for projects
+# without default 'CMakeLists.txt' file.
+
+FILE(GLOB_RECURSE app_sources ${CMAKE_SOURCE_DIR}/src/*.*)
+
+idf_component_register(SRCS ${app_sources})

src/cli.cpp

@@ -0,0 +1,160 @@
+#include "cli.hpp"
+#include <cstring>
+#include <cstdio>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/timers.h"
+#include "driver/uart.h"
+#include "esp_log.h"
+#include "config.hpp"
+
+static const char* TAG = "CLI";
+#define CLI_UART_PORT UART_NUM_0
+#define BUF_SIZE 1024
+
+// Handle a silence timer for suppressing logs during cli actions
+static TimerHandle_t silence_timer = nullptr;
+// Dynamic variable holding the current mute runtime
+static uint32_t current_mute_time_sec = Config::DEFAULT_MUTE_TIME_SEC;
+
+static void log_restore_timer_callback(TimerHandle_t xTimer) {
+    // Print a clean new prompt since logs might have disrupted the visual flow
+    printf("\r\n[System] Debug logs unmuted after %lu seconds of inactivity. \r\n%s # ",
+        (unsigned long)current_mute_time_sec, Config::PROJECT_TITLE);
+    fflush(stdout);
+
+    // Now safely restore global logging back to INFO level after inactivity
+    esp_log_level_set("*", ESP_LOG_INFO);
+}
+
+// Process input strings once the user presses Enter
+static void process_command(const char* cmd) {
+    if (strlen(cmd) == 0) return;
+
+    printf("\r\n"); // Move to new line after command execution
+
+    if (strcmp(cmd, "help") == 0) {
+        printf("Available commands:\r\n");
+        printf("  help       - Show this command overview\r\n");
+        printf("  version    - Display project title and version\r\n");
+        printf("  status     - Print internal hardware statistics\r\n");
+        printf("  mute <sec> - Set custom logging timeout (Current: %lus)\r\n", (unsigned long)current_mute_time_sec);
+    }
+    else if (strcmp(cmd, "version") == 0) {
+        printf("%s System - Running Version: %s\r\n", Config::PROJECT_TITLE, Config::PROJECT_VERSION);
+    }
+    else if (strcmp(cmd, "status") == 0) {
+        printf("--- %s Status ---\r\n", Config::PROJECT_TITLE);
+        printf("Free Internal Heap: %lu bytes\r\n", (unsigned long)esp_get_free_heap_size());
+        printf("Mute Timer Period : %lu seconds\r\n", (unsigned long)current_mute_time_sec);
+        printf("Target CPU Board  : ESP32\r\n");
+    }
+    // NEW: Handle the "mute" parameter runtime configuration
+    else if (strncmp(cmd, "mute ", 5) == 0) {
+        // Extract the value after the string space
+        int new_time = atoi(cmd + 5);
+        if (new_time > 0 && new_time <= 3600) { // Limit between 1 second and 1 hour
+            current_mute_time_sec = new_time;
+
+            // Instantly update the running FreeRTOS timer period
+            if (silence_timer != nullptr) {
+                xTimerChangePeriod(silence_timer, pdMS_TO_TICKS(current_mute_time_sec * 1000), pdMS_TO_TICKS(10));
+            }
+            printf("Success: Mute timer interval updated to %lu seconds.\r\n", (unsigned long)current_mute_time_sec);
+        } else {
+            printf("Error: Please provide a valid timeout between 1 and 3600 seconds.\r\n");
+        }
+    }
+    else {
+        printf("Unknown command: '%s'. Type 'help' for options.\r\n", cmd);
+    }
+
+    // Print command prompt again
+    printf("\r\n%s # ", Config::PROJECT_TITLE);
+    fflush(stdout);
+}
+
+// Background listening loop for keyboard input
+static void cli_worker_task(void *pvParameters) {
+    // Configure UART parameters for native monitoring
+    uart_config_t uart_config = {
+        .baud_rate = 115200,
+        .data_bits = UART_DATA_8_BITS,
+        .parity    = UART_PARITY_DISABLE,
+        .stop_bits = UART_STOP_BITS_1,
+        .flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
+        .source_clk = UART_SCLK_DEFAULT,
+    };
+
+    // Install UART driver without using resource-heavy interrupt queues
+    ESP_ERROR_CHECK(uart_param_config(CLI_UART_PORT, &uart_config));
+    ESP_ERROR_CHECK(uart_driver_install(CLI_UART_PORT, BUF_SIZE * 2, 0, 0, NULL, 0));
+
+    char line_buffer[BUF_SIZE];
+    int buffer_index = 0;
+
+    // Welcome message and initial prompt
+    printf("\r\n=== Interactive %s CLI Console Started ===\r\n", Config::PROJECT_TITLE);
+    printf("Type 'help' to get a list of active instructions.\r\n\r\n");
+    printf("%s # ", Config::PROJECT_TITLE);
+    fflush(stdout);
+
+    uint8_t data;
+    while (1) {
+        // Read character by character from serial interface (non-blocking with 20ms timeout)
+        int len = uart_read_bytes(CLI_UART_PORT, &data, 1, pdMS_TO_TICKS(20));
+
+        if (len > 0) {
+            esp_log_level_set("*", ESP_LOG_NONE);
+
+            if (silence_timer != nullptr) {
+                xTimerReset(silence_timer, pdMS_TO_TICKS(10));
+            }
+            // Handle carriage return or line feed (Enter key pressed)
+            if (data == '\r' || data == '\n') {
+                line_buffer[buffer_index] = '\0'; // Null-terminate string
+                process_command(line_buffer);
+                buffer_index = 0; // Reset buffer index for next command
+            }
+            // Handle Backspace (ASCII 8 or 127)
+            else if ((data == 8 || data == 127) && buffer_index > 0) {
+                buffer_index--;
+                printf("\b \b"); // Clear character visually in user terminal
+                fflush(stdout);
+            }
+            // Add normal printable characters to buffer
+            else if (data >= 32 && data <= 126 && buffer_index < (BUF_SIZE - 1)) {
+                line_buffer[buffer_index++] = data;
+                printf("%c", data); // Terminal Echo (prints what user types)
+                fflush(stdout);
+            }
+        }
+        // Minimal delay to keep watchdog and FreeRTOS internal background tasks happy
+        vTaskDelay(pdMS_TO_TICKS(10));
+    }
+}
+
+void start_cli_task(void) {
+    // Dynamically initialize the timer with the variable interval using milliseconds conversion
+    silence_timer = xTimerCreate(
+        "MuteTimer",
+        pdMS_TO_TICKS(current_mute_time_sec * 1000), 
+        pdFALSE,              
+        nullptr,
+        log_restore_timer_callback
+    );
+
+    if (silence_timer == nullptr) {
+        ESP_LOGE(TAG, "Failed to create FreeRTOS silence timer.");
+    }
+
+    xTaskCreatePinnedToCore(
+        cli_worker_task,
+        "CLI_InterfaceTask",
+        4096, // Slightly bigger stack to safely handle printf string buffers
+        NULL,
+        5,
+        NULL,
+        0 // Hosted on Core 0 to separate terminal interactive traffic from Core 1
+    );
+}

src/cli.hpp

@@ -0,0 +1,7 @@
+#ifndef CLI_HPP
+#define CLI_HPP
+
+// Starts the interactive Command Line Interface task
+void start_cli_task(void);
+
+#endif // CLI_HPP

src/config.hpp

@@ -0,0 +1,35 @@
+#ifndef CONFIG_HPP
+#define CONFIG_HPP
+
+#include <cstdint>
+#include "driver/gpio.h"
+// #include "driver/i2c_master.h"
+
+namespace Config {
+    // Compile-time constants with strict type enforcement
+    constexpr const char* PROJECT_TITLE   = "FoxMesh";
+    constexpr const char* PROJECT_VERSION = "1.0.2";
+    constexpr const char* PROJECT_AUTHORS = "Tom OE3TKT";
+
+    // CLI Mute Configuration
+    constexpr uint32_t DEFAULT_MUTE_TIME_SEC = 30; // Default: 30 seconds
+
+    // Hardware Configuration
+    constexpr gpio_num_t LED_GPIO_PIN     = GPIO_NUM_25;
+    constexpr int BLINK_INTERVAL_MS       = 2000;
+    // OLED
+    constexpr gpio_num_t OLED_SDA_PIN     = GPIO_NUM_21;
+    constexpr gpio_num_t OLED_SCL_PIN     = GPIO_NUM_22;
+    constexpr uint32_t OLED_I2C_FREQ_HZ   = 400000; // 400kHz Fast Mode
+    constexpr int OLED_ADDRESS            = 0x3C;   // Standard SSD1306 I2C Adress
+
+    // Semtech SX1276 LoRa SPI Subsystem (TTGO T3_V1.6 Hardwired Layout)
+    constexpr gpio_num_t LORA_MISO_PIN    = GPIO_NUM_19;
+    constexpr gpio_num_t LORA_MOSI_PIN    = GPIO_NUM_27;
+    constexpr gpio_num_t LORA_SCK_PIN     = GPIO_NUM_5;
+    constexpr gpio_num_t LORA_CS_PIN      = GPIO_NUM_18;
+    constexpr gpio_num_t LORA_RST_PIN     = GPIO_NUM_23; // Adjusted for T3_V1.6 hardware revision
+    constexpr gpio_num_t LORA_IRQ_PIN     = GPIO_NUM_26;
+}
+
+#endif // CONFIG_HPP

src/display.cpp

@@ -0,0 +1,167 @@
+#include "display.hpp"
+#include "driver/i2c_master.h"
+#include "esp_log.h"
+#include "config.hpp"
+#include <cstring>
+
+const char* DisplayController::TAG = "DISPLAY";
+
+static i2c_master_bus_handle_t bus_handle = nullptr;
+static i2c_master_dev_handle_t dev_handle = nullptr;
+
+DisplayController::DisplayController() : m_msgQueue(nullptr) {}
+
+void DisplayController::initI2C() {
+    // Configure the physical I2C Bus first
+    i2c_master_bus_config_t bus_config = {};
+    bus_config.i2c_port = I2C_NUM_0;
+    bus_config.sda_io_num = Config::OLED_SDA_PIN;
+    bus_config.scl_io_num = Config::OLED_SCL_PIN;
+    bus_config.clk_source = I2C_CLK_SRC_DEFAULT;
+    bus_config.glitch_ignore_cnt = 7;
+    bus_config.flags.enable_internal_pullup = true; // use internal pull-up resistor
+
+    // ESP_ERROR_CHECK(i2c_new_master_bus(&bus_config, &bus_handle));
+    esp_err_t err = i2c_new_master_bus(&bus_config, &bus_handle);
+    if (err != ESP_OK) {
+        ESP_LOGE(TAG, "Failed to create I2C bus: %s", esp_err_to_name(err));
+        return;
+    }
+
+    // Add the specific SSD1306 OLED Device to the running bus
+    i2c_device_config_t dev_config = {};
+    dev_config.dev_addr_length = I2C_ADDR_BIT_LEN_7;
+    dev_config.device_address = Config::OLED_ADDRESS;
+    dev_config.scl_speed_hz = Config::OLED_I2C_FREQ_HZ;
+
+    err = i2c_master_bus_add_device(bus_handle, &dev_config, &dev_handle);
+    if (err != ESP_OK) {
+        ESP_LOGE(TAG, "Failed to add OLED device to I2C bus: %s", esp_err_to_name(err));
+        return;
+    }
+
+    ESP_LOGI(TAG, "New I2C Master Bus and Device Handle registered successfully.");
+}
+
+
+void DisplayController::sendCommand(uint8_t command) {
+    if (dev_handle == nullptr) return;
+
+    // the new driver handles transactions internally in a single, safe array write
+    uint8_t write_buf[2] = {
+        0x00,   // Control byte: Co=0, D/C=0 (Incoming bytes are commands)
+        command // The actual payload command
+    };
+
+    // Increased timeout to 50ms and replaced hard ESP_ERROR_CHECK with a safe warning log
+    esp_err_t ret = i2c_master_transmit(dev_handle, write_buf, sizeof(write_buf), pdMS_TO_TICKS(50));
+    if (ret != ESP_OK) {
+        ESP_LOGW(TAG, "OLED Command 0x%02X failed or timed out: %s", command, esp_err_to_name(ret));
+    }
+}
+
+void DisplayController::initSSD1306() {
+    // If the hardware setup failed, don't run commands against a null handle
+    if (dev_handle == nullptr) {
+        ESP_LOGE(TAG, "Skipping SSD1306 init sequence because dev_handle is null.");
+        return;
+    }
+    // Minimalistic SSD1306 initialization sequence for 128x64 OLEDs
+    sendCommand(0xAE); // Turn display off
+    sendCommand(0xD5); // Set display clock divide ratio
+    sendCommand(0x80);
+    sendCommand(0xA8); // Set multiplex ratio
+    sendCommand(0x3F); // 64MUX
+    sendCommand(0xD3); // Set display offset
+    sendCommand(0x00);
+    sendCommand(0x40); // Set display start line
+    sendCommand(0x8D); // Charge pump charge
+    sendCommand(0x14); // Enable charge pump
+    sendCommand(0xAF); // Turn display on
+
+    // clear screen via modern buffer transfer
+     uint8_t clear_buf[129];
+    clear_buf[0] = 0x40; // Control byte: Data stream follows
+    memset(&clear_buf[1], 0x00, 128); // Fill frame buffer slice with zeros
+
+    // Clear screen natively by setting page addressing
+    for (uint8_t page = 0; page < 8; page++) {
+        sendCommand(0xB0 + page); // Set page address
+        sendCommand(0x00);        // Set lower column address
+        sendCommand(0x10);        // Set higher column address
+
+        // FIXED: Replaced ESP_ERROR_CHECK with safe error-handling to prevent software panic crashes
+        esp_err_t ret = i2c_master_transmit(dev_handle, clear_buf, sizeof(clear_buf), pdMS_TO_TICKS(50));
+        if (ret != ESP_OK) {
+            ESP_LOGE(TAG, "Failed to clear page %d buffer: %s. Aborting sequence.", page, esp_err_to_name(ret));
+            return; // Exit cleanly, allowing the CPU to boot other tasks
+        }
+    }
+    ESP_LOGI(TAG, "SSD1306 OLED Controller initialized and screen cleared.");
+}
+
+void DisplayController::startTask(uint32_t priority) {
+    initI2C();
+    initSSD1306();
+
+    // Create the message queue for up to 10 incoming text packages
+    m_msgQueue = xQueueCreate(10, sizeof(DisplayMessage));
+
+    // Spawn the worker thread on Core 0 (keeps Core 1 completely free for your Mesh engine)
+    xTaskCreatePinnedToCore(
+        DisplayController::taskTrampoline,
+        "OLED_RenderTask",
+        3584,
+        this,
+        priority,
+        nullptr,
+        0 // Pinned to Core 0
+    );
+}
+
+bool DisplayController::printMessage(const char* text, int row) {
+    if (m_msgQueue == nullptr) return false;
+
+    DisplayMessage msg = {};
+    strncpy(msg.text, text, sizeof(msg.text) - 1);
+    msg.row = row;
+
+    // Non-blocking write into the queue from any external task thread
+    return (xQueueSend(m_msgQueue, &msg, pdMS_TO_TICKS(10)) == pdPASS);
+}
+
+void DisplayController::taskTrampoline(void* pvParameters) {
+    auto* instance = static_cast<DisplayController*>(pvParameters);
+    if (instance != nullptr) {
+        instance->run();
+    }
+    vTaskDelete(nullptr);
+}
+
+void DisplayController::run() {
+    DisplayMessage incomingMsg;
+    ESP_LOGI(TAG, "OLED Core Engine operational loop active.");
+
+    // Dynamic boot screen utilizing configuration metadata
+    printMessage("====================", 0); // Row 0: Top Frame
+
+    // Format the title and version cleanly into Row 1
+    char titleBuffer[32];
+    snprintf(titleBuffer, sizeof(titleBuffer), "%s v%s", Config::PROJECT_TITLE, Config::PROJECT_VERSION);
+    printMessage(titleBuffer, 1);
+
+    // Format the copyright and authors into Row 2
+    char authorBuffer[32];
+    snprintf(authorBuffer, sizeof(authorBuffer), "(c) %s", Config::PROJECT_AUTHORS);
+    printMessage(authorBuffer, 2);
+
+    printMessage("====================", 3); // Row 3: Bottom Frame
+
+    while (true) {
+        // Deep sleep state: Task hits 0% CPU usage until a message arrives in the queue
+        if (xQueueReceive(m_msgQueue, &incomingMsg, portMAX_DELAY) == pdPASS) {
+            // Safe instrumentation logging (simulating the physical pixels)
+            ESP_LOGI(TAG, "[OLED ROW %d]: %s", incomingMsg.row, incomingMsg.text);
+        }
+    }
+}

src/display.hpp

@@ -0,0 +1,42 @@
+#ifndef DISPLAY_HPP
+#define DISPLAY_HPP
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/queue.h"
+#include "freertos/task.h"
+
+class DisplayController {
+public:
+    // Structure for the thread-safe communication queue
+    struct DisplayMessage {
+        char text[32]; // Buffer for short status messages (e.g., "LED ON", "Mesh Packet")
+        int row;       // Target row on the screen (e.g., 0 to 3)
+    };
+
+    DisplayController();
+    virtual ~DisplayController() = default;
+
+    // Deleted copy constructors for hardware safety
+    DisplayController(const DisplayController&) = delete;
+    DisplayController& operator=(const DisplayController&) = delete;
+
+    // Initializes I2C and spawns the background worker task on Core 0
+    void startTask(uint32_t priority = 4);
+
+    // Thread-safe public method that other tasks call to print text
+    bool printMessage(const char* text, int row);
+
+private:
+    static const char* TAG;
+    QueueHandle_t m_msgQueue;
+
+    void initI2C();
+    void initSSD1306();
+    void sendCommand(uint8_t command);
+
+    // FreeRTOS C++ bridging mechanisms
+    static void taskTrampoline(void* pvParameters);
+    void run();
+};
+
+#endif // DISPLAY_HPP

src/led.cpp

@@ -0,0 +1,57 @@
+#include "led.hpp"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_log.h"
+#include "config.hpp"
+
+// Initialize the static log tag
+const char* LedController::TAG = "LED";
+
+LedController::LedController(gpio_num_t gpioPin) : m_gpioPin(gpioPin) {
+    // Hardware initialization inside the constructor guarantees safe state upon creation
+    gpio_reset_pin(m_gpioPin);
+    gpio_set_direction(m_gpioPin, GPIO_MODE_OUTPUT);
+    ESP_LOGI(TAG, "Hardware initialized on GPIO %d.", m_gpioPin);
+}
+
+void LedController::startTask(uint32_t priority, BaseType_t coreId) {
+    // Pass 'this' (the pointer to the current instance) as the task parameter
+    xTaskCreatePinnedToCore(
+        LedController::taskTrampoline,
+        "LEDTask",
+        3072,
+        this,
+        priority,
+        nullptr,
+        coreId
+    );
+}
+
+void LedController::taskTrampoline(void* pvParameters) {
+    // Cast the raw object pointer back to our class instance
+    auto* instance = static_cast<LedController*>(pvParameters);
+    if (instance != nullptr) {
+        instance->run();
+    }
+
+    // Safety fallback: FreeRTOS tasks must never return natively
+    vTaskDelete(nullptr);
+}
+
+void LedController::run() {
+    ESP_LOGI(TAG, "FreeRTOS instance task successfully started on Core %d.", xPortGetCoreID());
+
+    // Define the fixed ON-time as a local constant
+    constexpr uint32_t led_on_ms = 30;
+
+    // Compile-time assertion to ensure the interval is always larger than the flash duration
+    static_assert(Config::BLINK_INTERVAL_MS > led_on_ms, "Global blink interval must be greater than 30ms!");
+
+    while (true) {
+        gpio_set_level(m_gpioPin, 1);    // LED on (High)
+        vTaskDelay(pdMS_TO_TICKS(led_on_ms));   // 30ms pulse width
+
+        gpio_set_level(m_gpioPin, 0);    // LED off (Low)
+        vTaskDelay(pdMS_TO_TICKS(Config::BLINK_INTERVAL_MS - led_on_ms)); // typ. 1970ms period low time
+    }
+}

src/led.hpp

@@ -0,0 +1,33 @@
+#ifndef LED_HPP
+#define LED_HPP
+
+#include "driver/gpio.h"
+#include "freertos/FreeRTOS.h"
+
+class LedController {
+public:
+    // Constructor allows passing the GPIO pin (defaults to 25 as requested)
+    explicit LedController(gpio_num_t gpioPin = GPIO_NUM_25);
+
+    // Destructor (virtual in case of inheritance)
+    virtual ~LedController() = default;
+
+    // Disallow copying to prevent multiple instances controlling the same hardware pin
+    LedController(const LedController&) = delete;
+    LedController& operator=(const LedController&) = delete;
+
+    // Spawns the FreeRTOS task pinned to a specific core
+    void startTask(uint32_t priority = 5, BaseType_t coreId = 1);
+
+private:
+    const gpio_num_t m_gpioPin;
+    static const char* TAG;
+
+    // Static trampoline function required by the FreeRTOS scheduler
+    static void taskTrampoline(void* pvParameters);
+
+    // Dynamic instance method where the actual blinking loop lives
+    void run();
+};
+
+#endif // LED_HPP

src/main.cpp

@@ -0,0 +1,77 @@
+#include <stdio.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "driver/gpio.h"
+#include "driver/spi_master.h"
+#include "esp_log.h"
+#include "config.hpp"
+#include "led.hpp"
+#include "cli.hpp"
+#include "display.hpp"  // thread-safe display
+
+static const char *TAG = "MAIN";
+
+// Global singleton instances for hardware abstraction
+static DisplayController oled;
+static LedController led(Config::LED_GPIO_PIN);
+
+void init_lora_spi(void) {
+    esp_err_t ret;
+
+    // Configure the SPI structure using the strict C++ constexpr constants
+    spi_bus_config_t buscfg = {};
+    buscfg.mosi_io_num = Config::LORA_MOSI_PIN;
+    buscfg.miso_io_num = Config::LORA_MISO_PIN;
+    buscfg.sclk_io_num = Config::LORA_SCK_PIN;
+    buscfg.quadwp_io_num = -1;
+    buscfg.quadhd_io_num = -1;
+    buscfg.max_transfer_sz = 0;
+
+    // Initialize the physical peripheral (VSPI / SPI3 on ESP32)
+    ret = spi_bus_initialize(SPI3_HOST, &buscfg, SPI_DMA_CH_AUTO);
+    if (ret != ESP_OK) {
+        ESP_LOGE(TAG, "Failed to initialize SPI bus: %s", esp_err_to_name(ret));
+        return;
+    }
+    ESP_LOGI(TAG, "SPI bus initialized successfully on VSPI (SPI3)");
+}
+
+// Fixed: Only ONE app_main exists now, marked as extern "C" for ESP-IDF bootloader
+extern "C" void app_main(void) {
+    // Dynamic string formatting using type-safe constants
+    ESP_LOGI(TAG, "=================================================");
+    ESP_LOGI(TAG, " Booting %s (Version: %s) via ESP-IDF C++",
+            Config::PROJECT_TITLE,
+            Config::PROJECT_VERSION);
+    ESP_LOGI(TAG, " (c) Authors: %s", Config::PROJECT_AUTHORS);
+    ESP_LOGI(TAG, "=================================================");
+
+    // Explicitly power up the onboard peripherals on TTGO T3
+//    gpio_reset_pin(GPIO_NUM_16); 
+//    gpio_set_direction(GPIO_NUM_16, GPIO_MODE_OUTPUT);
+    // Hard reset of the OLED display
+//    gpio_set_level(GPIO_NUM_16, 0);
+ //   vTaskDelay(pdMS_TO_TICKS(50));  // 50ms in Reset
+
+//    gpio_set_level(GPIO_NUM_16, 1); // Set HIGH to enable OLED power rails
+//    vTaskDelay(pdMS_TO_TICKS(100));  // Give the hardware 100ms to stabilize voltage
+
+    led.startTask();
+
+    start_cli_task();
+
+    oled.startTask();
+
+
+    // Synchronous test push to the display queue
+//    oled.printMessage("Mesh Scanning...", 2);
+
+    // Sytem Monitor Loop
+    while (true) {
+        ESP_LOGI(TAG, "[%s v%s] Operational. Free Heap: %lu bytes",
+                 Config::PROJECT_TITLE,
+                 Config::PROJECT_VERSION,
+                 (unsigned long)esp_get_free_heap_size());
+        vTaskDelay(pdMS_TO_TICKS(5000));
+    }
+}

test/README

@@ -0,0 +1,11 @@
+
+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