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smartDEN Maxi IoT - I/O Relay Module MQTT, HTTP with DIN RAIL BOX

smartDEN IP-Maxi-MQ is an Ethernet module (IP controller) that can be used in a wide range of remote sensors monitoring, home automation control, environmental monitoring and data-acquisition applications. Thank to its multi-channel design (8 digital inputs, 4 analog inputs, 4 temperature inputs, 8 SPDT relays and 2 analog outputs) this device can perform simultaneously a variety of measurement and control functions. The Web interface allows users to configure the smartDEN IP-Maxi-MQ, as well as to monitor/control input/output channels. Supported by DRMv3 Software. smartDEN IP-Maxi-MQ provides both MQTT and XML/JSON interface for integration with third-party developed applications. Works with Home Assistant, Domoticz and OpenHAB home automation systems as well as with Node-RED IoT platform.

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Price: $159.90
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  • Fully compatible with 10/100/1000 Base-T networks, Auto-MDIX;
  • Protocols: TCP/IP, HTTP, DHCP, DNS, SNTP, MQTT, ICMP (ping);


  • 8 digital inputs with On/Off LED (input voltage range: 0-12V DC / 0-24V DC);
  • 8 counters (32 bit) attached to digital inputs;
  • 4 analog inputs (input voltage range: 0-10V DC);
  • 4 temperature inputs for sensors NTC thermistors type B57500M;
  • Linearization (scaling) for the analog inputs;
  • Programmable temperature units: Celsius/Fahrenheit;
  • Configurable filters for the digital/analog inputs;


  • 8 SPDT relays (with NO and NC contacts), the type depends on the stocks quantity in our store:
  • 2 analog outputs: 0-10V DC (10 bit resolution);
  • Single pulse feature for the relay outputs;

Web Interface:

  • Integrated web server with secure login authorization;
  • Configuration of system parameters;
  • Outputs control, access current measurements;
  • Access protection (by IP and MAC address);

TCP/IP Services:

  • HTTP server:
    • Read (GET) current input/output values in XML/JSON format;
    • Set outputs along with GET request parameters;
  • Encrypted login can be used to access XML/JSON values;


  • MQTT V3.1.1;
  • MQTT notifications;

Standalone Mode:

  • Single digital input can be configured to control several relays;
  • Single or differential analog input can be configured to control several relays;
  • Week schedule table for switching relays ON/OFF at specific time without computer (up to 30 events);
  • Real time clock (can sync up with network time servers);

Power Supply:

  • Supply voltage: 12V DC or 24V DC (selectable during purchase);
  • Additional source voltage 12V DC or 24V DC provided to power input sensors;
  • Power supply protection against reverse polarity;

Physical and Environment:

  • Working temperature range: 0 to 70°C;
  • DIN rail standard housing;



  •  Documentation - here  



Package include:

  • 1 x smartDEN IP-Maxi-MQ module (12V or 24V version, depending on selected choice during ordering)
  • 1 x temperature NTC sensor B57500M

Please note the product does not come with power supply adapter that you may need. We offer suitable 12V or 24V adapters




smartDEN IP-Maxi-MQ is shipped with one NTC thermistor (temperature) sensor B57500M Epoxy Resin (up to 4 such sensors are supported by singe module). However additional sensors can be ordered from our store from these links:


The module has 4 analog inputs 0-10V which can be used also with every analog output sensor within this voltage range. You can check our other sensors as well for the analog inputs: LM35DZ (temperature), LM335Z (temperature), HIH-4000 (humidity), TSL250R (light), GP2Y0A21YK (proximity), Voltage Transducer 0-300V AC In, 0-10V DC Out, Current Transducer 0-50A AC In, 0-10V DC Out



Application Examples

Example 1. Controlling electrical appliances remotely




Example 2. Monitoring sensors online




Example 3. Controlling electrical devices depending on sensors values automatiacally (PC used only for configuration)




Example 4. Web based thermo-regulator




Example 5. smartDEN IP-Maxi-XX (including smartDEN IP-Maxi-MQ) has the unique capability to act like "differential" thermoregulator (control relay depending on two analog inputs values difference)




Example 6. smartDEN IP-Maxi-MQ used in application for counting customers in shops



Example 7. smartDEN IP-Maxi-MQ analog outputs can be used for diming led lights (not directly, but using led driver 0/1 - 10V)



Control smartDEN IP-Maxi-MQ from Home Automation systems

Home Assistant is very powerful home automation system. Please checkout our application note for more information.



OpenHAB is a third party open source free home automation software which can run on servers based on Linux, macOS, Windows, Raspberry Pi, PINE64, Docker, Synology...

There are two ways of communication - via HTTP GET and MQTT requests. More information about the integration with our hardware - or contact with us.



Domoticz is a free open source popular home automation software which can run on Windows, Linux, MAC, Rasberry PI and others. It is a home automation system design to control various devices and receive input from various sensors. Access it with apps for the web, iOS, Android and others.

More information about how to connect and use it with our hardware - or contact with us.

For Hardware configuration, please use: Type = Denkovi Modules with LAN (HTTP) Interface, Model = SmartDEN IP-Maxi



Access smartDEN IP-Maxi-MQ from Node-RED

Node-RED is a flow-based programming platform for the Internet of Things. We prepared small example for communication between Node-RED and our device. More info about Node-RED and denkovi modules: here

You can download the example Node-RED flows from here: MQTT and HTTP




Access smartDEN IP-Maxi-MQ from mobile devices

Android App DAE-aModules


Android app on Google Play




Some useful information:

  • In case smartDEN IP-Maxi-MQ - Cloud is selected:
    • MQTT Server - this is the MQTT broker IP address or DNS name (for example;
    • MQTT Server Port - the MQTT broker port (usually 1883);
    • MAC Address - the MAC address of smartDEN IP-Maxi-MQ;
    • User Name - the username used for connection (see it from "MQTT Settings" page from web server);
    • Password - the password used for connection (see it from "MQTT Settings" page from web server);
  • In case smartDEN IP-Maxi-MQ - XML is selected:
    • IP address (URL) - the IP address of the module;
    • Web Server Port - the web server port of the module;
    • Password - the web password (can be found in "General Settings" page);



Access via software DRMv3

This device is supported by DRMv3 Software.

The device can be found in the device list under the default name: smartDEN IP-Maxi-MQTT or smartDEN IP-Maxi-XML








The device can be controlled by smartDEN IP-32IN Input Module over the network

This is the so called BOX-TO-BOX mode. An input from smartDEN IP-32IN Input module can control over the network (ethernet/internet) relay from current module. Meantime it is also possible to control the relays and inputs from mobile devices, web browser... Please check out our application note DAE-AN016 for more information.



Control smartDEN IP-Maxi-MQ via MQTT

smartDEN IP-Maxi-MQ relays can be controlled by MQTT V3.1.1 messages. The module subscribes to a topic like SmartDEN_MQTTMaxi/E8EADA123456/Set/RS1 and the publisher (laptop, smartphone) sends a message like 0 or 1 to turn ON and OFF the relay. For full MQTT commands list, please refer to the product documentation.




Access smartDEN IP-Maxi-MQ from browser



Control smartDEN IP-Maxi-MQ via HTTP GET Request and receive the reply in XML or JSON format

For software integrators - as usually, the module supports HTTP GET requests with JSON/XML reply.

smartDEN IP-Maxi-MQ HTTP GET request concept

Sample JSON GET request:

Sample XML GET request:

Please refer to the documentation for more information what is the command format and what parameters are supported.

XML and JSON GET request / reply






Release Date Current  Version Update Utility Version History Note
Aug 2021


Denkovi Finder   Version History Instructions how to update - will be sent by request only


Denkovi software

  • DAE-aModules - App for Android mobile devices, support link here
  • Denkovi Finder - utility for discovery DAEnetIP4 and smartDEN devices in local network - here
  • DRMv3 Software - software for monitoring, control and configuration - here


Third party software


Software examples

  • Node-RED IoT platform - example communication flows in MQTT and HTTP. More about Denkovi modules and Node-RED: here.
  • Java - Netbeans example project how to set/get the smartDEN IP-MAXI-MQ I/O status using MQTT or HTTP GET requests in Java.
  •  C#.NET - Example 1 (MQTT) and Example 2 (HTTP GET Requests)
  • VB.NET - Example how to set/get the smartDEN IP-MAXI-MQ I/O status using HTTP GET requests in VB.NET
  • C++.NET - Example how to set/get the smartDEN IP-MAXI-MQ I/O status using HTTP GET requests in C++.NET
  • PHP Demo - Example how to set/get the smartDEN IP-MAXI-MQ I/O status using HTTP GET requests in PHP
  • Delphi Lazarus - Example how to set/get the smartDEN IP-MAXI-MQ I/O status using HTTP GET requests in Delhpi (Lazarus)
  • Visual Basic 6 - Example how to set/get the smartDEN IP-MAXI-MQ I/O status using HTTP GET requests in VB6
  • Node.js - Example how to set/get the smartDEN IP-MAXI-MQ I/O status using MQTT or HTTP GET requests in node.js
  • Python - Example how to set/get the device I/O status using HTTP GET requests


  • Problem: There is an access to the device via PING and Denkovi Finder "see" it, however it is not possible to open it's web server via any browser (the HTTP port is correct as well).
  • Solution: Some antivirus software (like Avast for example) may block the HTTP traffic to the device. Be sure this type of communication is enabled by your antivirus/firewall software.
Web server, MQTT, XML, JSON
Ethernet I/O Relay
Analog/Digital I/O


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