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How to Config WiFi for M5_LITE and S3_RELAY Devices

Instructions

How to Config WiFi for M5_LITE and S3_RELAY Devices

WiFi Configuration Guide

Last updated on 19 Mar, 2025

Overview

This guide explains how to configure WiFi settings on following devices to use customer's WiFi network

 

Supported DTU Models

 

Only following two models support WiFi configuration: M5_LITE and S3_RELAY

M5_LITE

Standard DTU device

Features:

- Web configuration interface

- Two Relay ports

- 2.4GHz WiFi support

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S3_RELAY

Single Relay with following Features:

- Web configuration interface

- One Relay port

- 2.4GHz WiFi support

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Automatic AP Mode Entry

The device will automatically enter AP (Access Point) mode under these conditions:

Failed to connect to WiFi ssd circumvend(This is the default WiFi used by DTU) or any pre-configed WiFi network. 

When in AP mode:

If DTU failed to connect to WiFi network,  it will turn on AP mode and provide WiFi network:

  • SSID: "DTU_XXXXXXXX" (XXXXXXXX = device IMEI)

  • Default Password: circumvend19731

  • AP IP Address: 192.168.123.1

  • Configuration Steps

 

How to config

1. Connect to Device WiFi

        1): On Mobile phone, go to Settings then WiFi

        2): Find the DTU networks in the WiFi list:

  • SSID: "DTU_XXXXXXXX"

  • Password: circumvend19731

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        3): Tap to select the network

       4): Enter WiFi password: circumvend19731

       5): Tap "Join" or "Connect"

 

2. Access Configuration Interface

 

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  • Open a web browser Navigate to 192.168.123.1

  • Click "Wi-Fi Settings"

  • Configure WiFi settings: Select the network you want to use from the scanned SSID list, for example: TPG056D

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  • Enter the network password

  • Submit the form Device will save settings and restart. If everything correct, the DTU will connect to WiFi TPG056D

 

Troubleshooting

Connection Issues

If connection fails:

It normally caused by following common reasons: 

  • Incorrect password

  • Network out of range: For WiFi Devices, need 4 bars signal to work stable.

  • Network band compatibility, currently our DTU only support 2.4GHz WiFi not 5GHz.

  • Network security type compatibility, make sure your WiFi Router Access Point (AP) Security configured to support WPA/WPA2

 

 

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