Add firmware_node app - Step 1: Shell with reset command

- Create new Zephyr app for firmware management
- Target: weact_stm32g431_core board
- Features: Shell interface with custom reset command
- Tested on Zephyr 4.1.99
- Flash usage: 55,400 bytes (42.27% of 128KB)
- RAM usage: 12,864 bytes (39.26% of 32KB)
- Black Magic Probe flash runner support

software/apps/firmware_node/CMakeLists.txt

@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.20)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+
+project(firmware_node LANGUAGES C)
+zephyr_include_directories(../../include)
+add_subdirectory(../../lib lib)
+target_sources(app PRIVATE src/main.c)

software/apps/firmware_node/README.md

@@ -0,0 +1,34 @@
+# Firmware Node Application
+
+This Zephyr application provides firmware management capabilities for the irrigation system.
+
+**Tested on Zephyr 4.1.99**
+
+## Features
+
+### Step 1: Shell with Reset Command
+- Shell interface with custom "reset" command
+- Warm reboot functionality
+
+### Planned Features
+- MCUboot support with partition manager
+- Firmware version display
+- MCUmgr support for OTA updates
+
+## Building
+
+```bash
+west build -p auto -b weact_stm32g431_core apps/firmware_node -- -DBOARD_FLASH_RUNNER=blackmagicprobe
+```
+
+## Flashing
+
+```bash
+west flash
+```
+
+## Usage
+
+Connect to the device via serial console and use the shell:
+- `reset` - Reboot the system
+- `help` - Show available commands

software/apps/firmware_node/boards/weact_stm32g431_core.conf

@@ -0,0 +1,2 @@
+# Board specific configuration for weact_stm32g431_core
+# This file can be used for board-specific overrides if needed

software/apps/firmware_node/prj.conf

@@ -0,0 +1,10 @@
+# Enable Console and printk for logging
+CONFIG_CONSOLE=y
+CONFIG_LOG=y
+
+# Enable Shell
+CONFIG_SHELL=y
+CONFIG_REBOOT=y
+
+# Enable the reset command
+CONFIG_KERNEL_SHELL=y

software/apps/firmware_node/src/main.c

@@ -0,0 +1,28 @@
+#include <zephyr/kernel.h>
+#include <zephyr/shell/shell.h>
+#include <zephyr/sys/reboot.h>
+#include <zephyr/logging/log.h>
+
+LOG_MODULE_REGISTER(firmware_node, LOG_LEVEL_DBG);
+
+static int cmd_reset(const struct shell *shell, size_t argc, char **argv)
+{
+    ARG_UNUSED(argc);
+    ARG_UNUSED(argv);
+    
+    shell_print(shell, "Rebooting system...");
+    k_msleep(100); // Give time for message to be sent
+    sys_reboot(SYS_REBOOT_WARM);
+    
+    return 0;
+}
+
+SHELL_CMD_REGISTER(reset, NULL, "Reset the system", cmd_reset);
+
+int main(void)
+{
+    LOG_INF("Firmware Node starting up");
+    LOG_INF("Shell with reset command available");
+    
+    return 0;
+}

software/apps/firmware_node/sysbuild.cmake

@@ -0,0 +1,12 @@
+# Enable MCUboot
+set(SB_CONFIG_BOOTLOADER_MCUBOOT y)
+
+# MCUboot configuration
+set(SB_CONFIG_MCUBOOT_BOOTLOADER_MODE_OVERWRITE_ONLY y)
+set(SB_CONFIG_MCUBOOT_SIGNATURE_KEY_FILE "bootloader/mcuboot/root-rsa-2048.pem")
+set(SB_CONFIG_MCUBOOT_GENERATE_UNSIGNED_IMAGE y)
+set(SB_CONFIG_MCUBOOT_GENERATE_CONFIRMED_IMAGE y)
+
+# Enable USB CDC ACM for MCUboot console
+set(SB_CONFIG_MCUBOOT_USB_SUPPORT y)
+set(SB_CONFIG_MCUBOOT_SERIAL y)