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Device guide

Robustel routers and
IoTMail SMTP

Configure SMTP email alerts on Robustel industrial routers and IoT gateways using IoTMail. Covers R2000, R3000, R5020 and EG series running Robustel RobOS.

About Robustel

Industrial IoT from Guangzhou

Robustel was founded in 2010 in Guangzhou, China, with a focus on industrial-grade cellular routers and IoT gateways for demanding environments. The company built a strong reputation in European industrial automation, smart grid, and oil and gas markets through a combination of competitive hardware specifications, comprehensive SDK support, and a pragmatic approach to certifications including ATEX and IECEx for hazardous area deployments.

Company background

  • Founded 2010, Guangzhou, China
  • Focus on industrial and harsh environment deployments
  • Strong presence in European industrial automation
  • ATEX and IECEx certified models for hazardous areas
  • RobOS firmware with Python app container support
  • Distributed in UK and Europe via authorised partners
  • Products certified for rail (EN50155) and utilities (IEC 61850)

Robustel in UK industrial deployments

Robustel devices are found in UK water treatment facilities, oil and gas monitoring installations, and smart metering infrastructure. Their ATEX-rated models fill a specific gap in the market for cellular connectivity in zones where explosion-proof equipment is required. The R3000 series is particularly widely deployed in UK utilities due to its wide operating temperature range and dual SIM resilience.

RobOS includes a built-in email alarm function that connects directly to IoTMail without any additional configuration or SDK development.

Product range

Robustel product families

Robustel manufactures routers and gateways across three primary families, from compact M2M routers through to edge computing platforms with on-device application support.

📡
R2000
Compact dual SIM 4G router. Cost-effective M2M connectivity for standard environments.
📡
R3000
Industrial dual SIM router with I/O. Wide temperature range, DIN rail mount.
📡
R5020
Dual SIM LTE-A Pro router. High throughput for bandwidth-intensive industrial applications.
🔗
EG5100
Industrial IoT gateway with edge computing. Runs Python apps on-device via RobOS.
🔗
EG3100
Compact IoT gateway with serial and digital I/O. Modbus TCP/RTU support.
⚠️
R3000 ATEX
Zone 2 hazardous area certified router. Oil, gas and chemical plant deployments.
🚂
R3000 Rail
EN50155 railway certified router. Shock, vibration, and EMC rated for rail environments.
☁️
Robustel Cloud
Device management and monitoring platform. Remote config and firmware deployment.
Configuration guide

Setting up IoTMail on a Robustel router

RobOS includes an Email Alarm module in the Services section. These steps apply to all current R series and EG series devices running RobOS 3.x or later.

Before you start: Log in to portal.iotmail.co.uk and copy your device SMTP credentials. The SMTP host is smtp.iotmail.co.uk, port 587 with STARTTLS.
1
Access the RobOS web interface
Browse to 192.168.0.1 (Robustel default) or the router's management IP. Log in as admin.
2
Navigate to Services > Email Alarm
In the left navigation, expand Services and select Email Alarm. Enable the feature if it is not already active.
3
Configure SMTP settings
Enter the IoTMail server details in the SMTP configuration section.
SMTP SettingsRobOS - Email Alarm configuration
SMTP Server:      smtp.iotmail.co.uk
SMTP Port:        587
Secure Auth:      STARTTLS
Account:          yourhandle+devicetag   # from IoTMail portal
Password:         your-device-password   # from IoTMail portal
Sender Email:     yourhandle+devicetag@iotmail.co.uk
Recipient Email:  alerts@yourdomain.com
4
Set alarm triggers
Configure which events send email. RobOS supports: WAN up/down, SIM switch, low RSSI threshold, reboot, I/O state change, temperature alarm, and custom Python app triggers on EG series.
5
Save and test
Click Save and Apply, then use the Test Email button. Verify in your inbox and in the IoTMail portal send log.
EG series Python apps: The EG5100 and EG3100 support Python application containers via RobOS SDK. Custom applications can call IoTMail via standard Python smtplib using the same credentials and server settings. This allows conditional alert logic, data aggregation before sending, and custom email formatting beyond what the built-in alarm system supports.
Use cases

Robustel and IoTMail in the field

Water treatment monitoring

R3000 routers at unmanned pumping stations send email when connectivity drops or when Modbus readings from connected sensors cross alarm thresholds. Operations teams receive alerts before SCADA dashboards are checked.

Oil and gas hazardous areas

ATEX-certified R3000 units in Zone 2 classified areas send email alerts on gas sensor thresholds via Modbus. IoTMail provides the offsite delivery infrastructure without any infrastructure changes at the site.

Smart metering and AMI

EG series gateways aggregating Modbus meter data send email summaries and alarm notifications. The Python SDK allows custom formatting of meter readings directly into the email body before delivery via IoTMail.

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