The UART-WIFI232-B2 is an industrial-grade embedded module that provides bidirectional transparent transmission between TTL serial (UART), WiFi (802.11b/g/n), and 100 Mbps Ethernet. It functions as a serial server, Modbus gateway, MQTT gateway, and HTTP client, enabling traditional serial devices or MCU-controlled equipment to quickly connect to wireless and wired networks.

Configuration is available via AT commands, a built-in web interface, or host serial port settings, making it flexible for a wide range of IoT and industrial automation applications.

Key Features

• Triple Interface – UART to WiFi, UART to Ethernet, and Ethernet to WiFi bridging
• Transparent Transmission – TCP Server/Client, UDP Server/Client modes
• MQTT Gateway – Subscribe to 6 topics and publish 6 topics simultaneously
• Modbus Gateway – Modbus TCP to Modbus RTU interconversion
• HTTP Client – Send and receive data from HTTP servers
• WebSocket Support – Real-time serial-to-web data interaction
• 100 Mbps Ethernet – Wired network connectivity alongside WiFi
• Multiple WiFi Modes – AP, STA, and AP+STA
• Built-in Web Interface – Configure IP, port, baud rate, and other parameters via browser
• AT Command Support – Query status and set parameters via serial commands
• Registration & Heartbeat Packets – Device identification and connection monitoring

Specifications

• WiFi Standard – 802.11b/g/n
• Ethernet – 100 Mbps
• Serial Interface – UART (TTL)
• WiFi Modes – AP, STA, AP+STA
• Protocols – TCP, UDP, MQTT, HTTP, Modbus TCP/RTU, WebSocket
• Configuration – AT commands, web browser, serial port

Package Contents

• 1× UART-WIFI232-B2 module
• 1× IPX 2.4 GHz 2 dBi antenna

Ideal For

• Industrial IoT gateways and data acquisition
• Connecting legacy serial devices to WiFi/Ethernet networks
• Modbus TCP/RTU protocol conversion
• Remote monitoring and intelligent instrument control

Resources

• Waveshare Wiki – Documentation & Downloads