A complete ESP-IDF/FreeRTOS implementation providing a Modbus-to-WiFi bridge with RS485 communication, TCP/TLS client and server, BLE support, and comprehensive system management.
- RS485/Modbus RTU: Full Modbus RTU support with CRC validation
- WiFi: Dual mode (AP+STA) with static IP configuration
- TCP/TLS Client: Secure connection to cloud server with PSK authentication
- TCP/TLS Server: Multi-client server support
- BLE: GATT server with read/write/notify characteristics
- RS485 ↔ TCP: Bidirectional data routing between Modbus and TCP protocols
- Protocol Conversion: Automatic conversion between Modbus frames and protocol frames
- Data Processing: Comprehensive frame building, parsing, and validation
- Parameter Management: NVS-based persistent storage
- OTA Updates: HTTPS-based firmware updates
- Factory Test/Reset: Factory mode and reset functionality
- Heartbeat: Keep-alive mechanism for connections
- Poll Timer: Periodic RS485 polling
- LED Status: Visual indication of system state (3 LEDs)
- Button Control: Factory reset, test mode, and reboot
- UART Terminal: Command-line interface (LPTS1-7, LPTQ1-7, SHELL)
ESP32ModbusBridge/
├── main/
│ ├── main.c # Application entry point
│ └── CMakeLists.txt # Build configuration
├── src/
│ ├── tasks/ # FreeRTOS tasks
│ │ ├── rs485_task.c/h # RS485/Modbus communication
│ │ ├── wifi_task.c/h # WiFi management
│ │ ├── tcp_client_task.c/h # TCP client with TLS
│ │ ├── tcp_server_task.c/h # TCP server
│ │ ├── ble_task.c/h # BLE GATT server
│ │ ├── uart_rx_task.c/h # UART terminal
│ │ ├── led_task.c/h # LED status indication
│ │ └── button_task.c/h # Button handling
│ ├── protocol/ # Protocol handling
│ │ ├── data_process.c/h # Data processing module
│ │ ├── modbus_protocol.c/h # Modbus protocol
│ │ ├── crc_utils.c/h # CRC calculation
│ │ └── function_codes.h # Function code definitions
│ ├── config/ # Configuration
│ │ ├── param_manager.c/h # Parameter management
│ │ └── param_ids.h # Parameter ID definitions
│ ├── shell/ # Terminal interface
│ │ └── terminal_service.c/h # Command parser
│ ├── utils/ # System utilities
│ │ ├── heartbeat.c/h # Heartbeat mechanism
│ │ ├── poll_timer.c/h # Poll timer
│ │ ├── factory_test.c/h # Factory test mode
│ │ ├── system_utils.c/h # System utilities
│ │ ├── watchdog.c/h # Watchdog management
│ │ └── ringbuffer.c/h # Ring buffer utilities
│ ├── ota/ # OTA updates
│ │ └── ota_manager.c/h # OTA manager
│ ├── system/ # System initialization
│ │ ├── sdk_init.c/h # SDK initialization
│ │ └── boot_init.c/h # Boot initialization
│ ├── drivers/ # Hardware drivers (stubs)
│ └── network/ # Network utilities (stubs)
├── CMakeLists.txt # Root build file
├── sdkconfig.defaults # Default SDK configuration
└── README.md # This file
- ESP-IDF v4.4 or later
- CMake 3.16 or later
- Python 3.6 or later
The project includes build scripts that automatically detect your ESP-IDF installation:
Linux/macOS:
cd ESP32ModbusBridge
./build.sh [target] # target: esp32, esp32s2, esp32s3, esp32c3, esp32c6, esp32h2 (default: esp32)
./flash.sh [port] # port: /dev/ttyUSB0, /dev/ttyACM0, etc. (default: /dev/ttyUSB0)Windows:
cd ESP32ModbusBridge
build.bat [target] # target: esp32, esp32s2, esp32s3, esp32c3, esp32c6, esp32h2 (default: esp32)
flash.bat [port] # port: COM3, COM4, etc. (default: COM3)The build scripts will:
- Automatically detect ESP-IDF installation from common locations
- Set up the ESP-IDF environment
- Build the firmware for the specified target chip
- Create all necessary binaries (bootloader, partition table, application)
If you prefer to build manually:
cd ESP32ModbusBridge
. $IDF_PATH/export.sh # Linux/macOS
# or
%IDF_PATH%\export.bat # Windows
idf.py set-target esp32
idf.py build
idf.py -p /dev/ttyUSB0 flash monitor # Linux/macOS
# or
idf.py -p COM3 flash monitor # Windows- WiFi SSID: "LuxPower" (configurable via parameters)
- Server: "dongle_ssl.solarcloudsystem.com:4348"
- RS485: 9600 baud, 8E1, half-duplex
- UART Terminal: 115200 baud, 8N1
- PARAM_ID_2: WiFi SSID
- PARAM_ID_3: WiFi Password
- PARAM_ID_5: Server Host
- PARAM_ID_6: Server Port
- PARAM_ID_7: Device Serial Number
- PARAM_ID_8: Query Period
- PARAM_ID_10: Factory Test Flag
- PARAM_ID_14: IP Configuration (0=DHCP, 1=Static)
LPTS1: Set WiFi SSIDLPTS3: Set WiFi PasswordLPTS4: Set Server HostLPTS5: Set Server PortLPTS7: Set Device SNLPTQ1: Query WiFi SSIDLPTQ2: Query WiFi PasswordLPTQ3: Query Server HostLPTQ4: Query Server PortLPTQ6: Query Device SNLPTQ7: Query Device StatusSHELL: Enable shell mode
- Short Press (>100ms): Factory test mode
- Medium Press (>500ms): Factory reset
- Long Press (>1000ms): System reboot
- 0x03: Read Holding Registers
- 0x04: Read Input Registers
- 0x21, 0x22, 0x88, 0xFE: Custom function codes
- 193 (0xC1): Heartbeat
- 194 (0xC2): Data Transmission
- 195 (0xC3): Get Parameter
- 196 (0xC4): Set Parameter
This project is organized into modular components with clear separation of concerns:
- Task-based architecture for concurrent operations
- Protocol handling for Modbus and custom protocols
- Configuration management via NVS storage
- Comprehensive error handling and logging throughout
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✅ Project Complete - All modules implemented and ready for testing
For detailed documentation, see the docs/ directory:
IMPLEMENTATION_STATUS.md- Detailed implementation statusPROJECT_COMPLETE.md- Project completion summaryBUILD_AND_DEPLOY.md- Build and deployment guideSTUB_FILES_REMOVED.md- Information about removed stub files- And more...