4G Router

1. Overview

The MTech Industrial IoT Gateway is designed to provide internet access to industrial IoT devices. This version supports internet connectivity through WiFi, BLE, and Ethernet using an LTE CAT4 Modem.

2. Powering the Device

  • Input Voltage: 5V DC
  • Max Power: 10W
  • Standby Power: 2W

A pluggable terminal block is used for connecting the power.

3. Indicators

The device includes six LEDs to indicate operational status:

  • Indicator 1: GSM Network status
  • Indicator 2: GPRS/EDGE/HSPA/LTE connection status
  • Indicator 3: WiFi status
  • Indicator 4: Device readiness
  • Indicator 5: Ethernet link speed
  • Indicator 6: Ethernet data transfer activity


The device has an internal DHCP server running over Ethernet with default settings:

  • Default Gateway:
  • DNS:
  • Subnet:

5. Internal System

The main controller used is the ESP32-S3 SOC, featuring:

  • CPU: Dual-core Xtensa LX7
  • Memory: 16MB Flash, 8MB PSRAM
  • Ethernet MAC and PHY: W5500 SPI
  • Modem: Quectel EC200A 4G LTE with 3G/2G fallback

6. Web Interface

Accessible through the gateway’s IP address (default, the web interface allows setting parameters such as:

  • APN for modem internet
  • Packet device IP and flow direction
  • WiFi station and access point parameters
  • Cooling fan management

Default login credentials:

  • Username: admin
  • Password: admin

7. Ethernet

Settings for Ethernet configuration include enabling/disabling the interface, sharing internet via Ethernet, and selecting the operation mode (DHCP Server, DHCP Client, Static IP).

8. WiFi

WiFi configuration options include enabling/disabling the interface, sharing internet via WiFi, and setting the operation mode (Station or Hotspot). Interface priority can also be set for WiFi.

9. GSM

GSM settings allow enabling/disabling the LTE modem, providing PPP authentication parameters, setting a SIM PIN, and setting interface priority for the LTE modem.

10. Interface Route Priority

The device can access the internet via Ethernet, WiFi, or LTE, with a configurable interface priority. The highest priority interface is used first, and the device falls back to the next highest priority if the primary interface is unavailable.