Industrial IoT Gateway

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Industrial IoT Gateway

IoT Gateway MEI GROUP is a central data collection and transmission device for the factory, supporting connectivity LAN Ethernet combined with the network LoRa UART to build a distributed monitoring system without pulling long RS485 wires. Gateway uses ESP32 dual-core 240MHz, operates stably 24/7 and integrates WiFi/LAN for SCADA, MES or internal server connection via MQTT/MQTTS, HTTP/HTTPS or WebSocket.

Support equipment M-Bus/RS485 Modbus RTU to read electronic water meters, industrial sensors and energy meters. Inputs 4–20mA/0–10V allows collection of pressure, water level, pH, EC/TDS or analog signals in the production line. There are also Digital Input/Output to monitor pump, valve, motor status and support remote control.

Network LoRa UART Allows connection of 20–200 distributed sensor nodes, with polling, packet deduplication, CRC checking and RSSI – battery management for each device. Data is noise filtered, logged and automatically synchronized when LAN is lost. IoT Gateway is suitable for monitoring water, environment, energy, electrical panels and the entire operating system in the factory.

Ministry IoT Gateway MEI Factory is an industrial data collection and transmission device developed on the platform ESP32, serves as the connection hub between field devices and the platform MEI ECO, SCADA or MES. Support equipment Ethernet (LAN), LoRa UART, RS485 Modbus RTU/M-Bus same inputs Analog 4–20 mA/0–10 V and Digital I/O, allows data collection from a variety of sensors and industrial devices on the same system.

Gateway used LoRa UART to replace the glands RS485 long distances, helping to reduce wiring costs and expand connection range to hundreds of measurement nodes in the factory. The device supports data processing at the edge (Edge Processing), noise filtering, Data Logging, automatically synchronizes data when the connection is restored and transmits data via MQTT, HTTP/HTTPS or Modbus TCP.

The system supports centralized management of multiple LoRa Nodes, monitors connection status, warns of lost communication or abnormal devices, and provides Dashboard, trend charts, user permissions and Export Excel report, effectively meeting the needs of digital transformation and industrial monitoring in modern factories.

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TECHNICAL SPECIFICATIONS

FACTORY IoT GATEWAY SET – LAN + LoRa UART + M-Bus + I/O**

The IoT Gateway set uses ESP32 designed by MEI GROUP as a data gathering point for the entire factory, integrating connectivity LAN Ethernet and network LoRa UART to collect data from distributed devices. The device replaces remote RS485 wires in the factory with a highly stable industrial LoRa system, while also supporting M-Bus/RS485, 4–20mA, and Digital I/O.

1. Hardware architecture

1.1 Processor

  • ESP32-WROOM / ESP32-S3

  • Dual-core 240MHz, RAM 520KB – 2MB

  • Flash 4–16MB, supports WiFi + Light-Sleep/Deep-Sleep mode

  • Operates 24/7 in industrial environments

2. Industrial communication

2.1 Ethernet LAN

  • RJ45 10/100 Mbps

  • Support:

    • MQTT/MQTTS

    • HTTP/HTTPS

    • Websocket

    • Modbus TCP (optional)

→ Connect directly to the factory's internal SCADA, MES, DCS, Server.

2.2 LoRa UART (E22/E32/RYLR – industrial long range)

LoRa used UART, do not use SPI.

  • UART rate: 9600–115200 bps

  • Frequency: 433/470/868 MHz

  • TX power: 22–30 dBm

  • Coverage:

    • Inside the factory: 500m – 2km

    • Outdoors: 3–10 km

  • Transmission protocol:

    • Polling theo ID

    • Node sends periodically

    • ACK/Retry prevents packet loss

    • CRC checks data integrity

Application:

  • Collect data from LoRa nodes measuring pressure - flow - water level

  • Monitor electrical cabinets, motors, tanks

  • Connect remote sensors without RS485 wires

2.3 M-Bus / RS485 Modbus RTU

  • Used to read industrial equipment:

    • Ultrasonic/electronic water meter

    • Pressure and flow sensors

    • Total electrical energy, 3-phase meter

  • Speed: 9600–19200 bps

  • There is a retry + timeout + CRC packet check mechanism

2.4 Industrial I/O input

Analog Input 4–20mA / 0–10V

  • 2–6 channels

  • ADC 16 bit (ADS1115/ADS1220)

  • Isolation against interference

  • Used to measure: pressure, water level, pH, DO, EC/TDS...

Digital Input

  • 4–8 channels

  • Supports Dry-Contact or 12–24VDC

  • Used to monitor the status of pumps, fans, motors, and valves

Digital Output

  • 2–4 relay channels

  • Used to trigger alarms, open/close valves/pumps

3. Data processing features

3.1 Advanced signal filtering

  • EMA/Kalman cho analog

  • Anti-spike, industrial interference

  • Detect loss of LoRa/RS485 signal

3.2 Memory

  • Flash 4–16MB

  • SD Card 8–32GB (optional)

  • Mechanism Data Logging + ReSync when losing LAN

4. Integrate factory monitoring system

4.1 LAN connection

  • Send data to:

    • MEI ECO On-Premise / Cloud

    • SCADA

    • MES / DCS

  • Data format: JSON, MQTT, Modbus TCP (optional)

4.2 Internal LoRa UART network

Management gateway:

  • 20–200 node LoRa

  • Node list: ID, RSSI, battery, status

  • Anti-collision

  • Synchronize time across the network

5. Industrial warnings

  • LoRa node connection lost

  • M-Bus is not responding

  • Low/high pressure

  • Water level exceeds threshold

  • Abnormal pump/valve status

  • High device temperature/humidity

  • Warning via:

    • Dashboard MEI ECO

    • Email, Telegram/Zalo (API)

    • WebApp real-time alerts

6. Practical application

  • System monitoring water – gas – steam – pump – valve in the factory

  • Collect distributed data using LoRa-UART

  • Water supply, wastewater, environmental treatment systems

  • Energy monitoring – electricity meter – flow

  • Connecting electrical cabinets, pumping stations, silos, tanks

  • SCADA integration but No need for long RS485 cables

Technical specifications are subject to change.
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