DFRobot - ESP32 Embedded Serial to Ethernet Module with Wi-Fi & Bluetooth

Embedded Serial to Ethernet Module is a compact networking solution built around the ESP32 series SoC, designed to bridge serial devices with Ethernet and wireless networks. This embedded communication gateway integrates an optimized TCP/IP protocol stack, enabling rapid network connectivity for embedded systems while reducing firmware development complexity. Dual‑mode 2.4GHz Wi‑Fi and Bluetooth capability delivers stable wireless communication alongside wired Ethernet connectivity. High RF performance, strong reliability, and low power consumption make this networking module suitable for industrial automation, remote sensor communication, and distributed IoT infrastructure requiring dependable serial data transmission.

Note: The applicable temperature of the product is -20°C~+70°C

Integrated Multi‑Protocol Networking Capability

This serial networking module integrates a complete TCP/IP protocol stack that simplifies communication between embedded devices and network services. Four working modes—TCP Server, TCP Client, UDP Server, and UDP Client—allow flexible deployment in data acquisition systems or remote device control platforms. Multiple communication interfaces including serial port, Wi‑Fi, Ethernet, and Bluetooth enable pairwise data routing across six transparent transmission modes. Such architecture supports efficient device‑to‑cloud communication and simplifies integration with existing industrial or IoT networking infrastructure.

High‑Performance ESP32 Wireless Connectivity

Built on the ESP32 wireless SoC platform, this embedded gateway combines 2.4GHz Wi‑Fi and Bluetooth dual‑mode communication within a single compact design. Strong RF performance and stable wireless connectivity support reliable data exchange in demanding environments. Advanced encryption technologies including AES, RSA, ECC, and SHA enhance communication security, while multiple Wi‑Fi operating modes such as Station, SoftAP, and P2P allow flexible network deployment in both standalone and router‑connected scenarios.

Flexible IoT Data Acquisition and Control

Abundant onboard IO resources enable integration with environmental and industrial sensors, forming a versatile data transmission node for distributed monitoring systems. Sensor measurements such as air temperature, humidity, soil moisture, soil pH, and carbon dioxide concentration can be collected and transmitted to remote servers through wired or wireless networks. Embedded IO capability also supports equipment interaction such as ventilation control or heating management, allowing this IoT communication board to serve as both a data gateway and a simple automation controller.

Figure: Embedded Serial to Ethernet Module

Reliable connectivity and flexible interface options make this embedded serial communication gateway suitable for IoT deployments across agriculture, industry, and smart monitoring systems. Environmental sensing networks, agricultural automation platforms, and remote equipment telemetry can benefit from stable data transmission between distributed sensors and centralized servers, supporting scalable infrastructure for modern connected device ecosystems.

Update Reminder: The module has updated the factory-configured universal AT firmware to the current version V1.3. For detailed information, please refer to the V1.3 AT commands.

• Supports complete TCP/IP protocol stack
• Abundant wireless communication interface
• Multiple working modes are available

• IoT scenarios
• Smart agricultural sensor data monitoring

Wi-Fi

• RF certification: FCC/CE/RoHS
• Protocol: 802.11 b/g/n/e/i(802.11n, up to 150Mbps) A-MPDU and A-MSDU aggregation, 0.4 second guard interval support
• Frequency Range: 2.4~2.5GHz

Bluetooth

• Protocols: Compliant with Bluetooth V4.2 BR/EDR and BLE standards
• Radio frequency: NZIF receiver with -97dBm sensitivity

Hardware

• Network port specifications: RJ45, 10/100Mbps, cross-direct connection adaptive
• Serial baud rate: 80~5000000
• On-board Flash: 32Mbit
• Operating Voltage: 5V or 3.3V power supply (optional)
• Working current: Average 80mA
• Supply current: Minimum 500mA
• Working temperature range: -40°c ~ +85°c
• Ambient temperature range: Normal temperature
• Packaging: Half pad/ through-hole connector (optional)

Software

• Wi-Fi mode: Station/ SoftAP/ SoftAP+station/ P2P
• Wi-Fi security mechanism: WPA/ WPA2/ WPA2-Enterprise/ WPS
• Encryption type: AES/ RSA/ ECC/ SHA
• Firmware upgrade: Remote OTA upgrade via network
• Software development: SDK used for further development
• Network protocol: IPv4, TCP/ UDP
• IP access methods: Static IP, DHCP (default)
• Simple transmission mode: TCP Server/ TCP Client/UDP Server/ UDP Client
• User configurations: AT+ commands set

• Embedded Serial to Ethernet Module x1