KMTronic IP 8 Radio Relay Board Driver

The KMTronic Radio 8 channels Relay board is a simple and inexpensive output module to control 8 relays (250VAC/10A) over Radio Freqency. Our driver allows the Control4 integration of relays as connections.
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  • High value for money CE marked relay board.
  • UDP controlled.
  • 8 SPDT relays 250VAC/10A or 125VAC/15A.
  • buying devices on


  • Free fully working license for dealers (contact us on
  • Relay integration as connections.
  • Support for multiple relay boards connected to the same C4 control unit.
  • Trigger and toggle functions.



  • KMTronic provided the Relay board we used for the driver development and testing.
  • Alex Edmondo participated to the requirements definition and testing.



Control4 KMTronic Radio 8 channels WEB Relay board


Buying the device

On the KMTronic ( online shop, search for: KMTronic Radio 433MHz 8 channels WEB Relay board.


To get a valid license code refer to houselogix market place.

Device setting (from the KMTronic Howto)

The default IP address of the device is If your LAN IP mask is different, you need one time access to network 192.168.1.x to change default setting of KMTronic.

Open a browser and type

The default user is admin with password admin.

In “Configuration” menu you can change default:

  • IP Address

  • Gateway

  • HTTP Port

  • UDP Source Port

  • UDP Destination Port


In order to change the Default configurations, you need to follow the instruction to change the security setting of your device:

Open UDP RF433MHz Transmitter "PIN Configuration" menu


Enter your PIN code (in example 1234) and click Save.

(Is mandatory to enter a pin)

Turn OFF (up) all DIP Switches RF433MHz Relay board (PIN SET MODE)


Power  the Relays board.

Download and run UDP Test software from

Enter IP, Port, Command FF0101, click on Open and next Send

Enter the default value (IP:, Port 12345) to confirm the change

Software must receive reply from board

Turn ON (down) DIP Switch '1' RF433MHz Relay board




For the integration with Control4, the device must have a fixed IP address. Please, set it on the device or in your DHCP server setting.

In “Authorization Configuration” you can change username name and password for device authentication. They will be required duringthe Driver configuration, so write them down.


In the relay control interface you can test your device relays.


Driver installation

Install the driver in your Control4 project using the composer (as any other driver) and set the following properties:

  • Debug: in normal operating conditions is better to set it to “Off”

  • KMTronic IP: device IP you set in the previous step.

  • KMTronic Port: device HTTP Port if you changed it.

  • Polling: Set it to “On” only if you plan to change the state of the relay from the native KMTronic web interface, otherwise it is not necessary.

  • Polling seconds: select the frequency you want to update Control4 about the change coming from the KMTronic web interface.

  • License code: copy & paste here the license code we sent to you during the license buying process.




For each relay, you will find a KMT Relay connection that allows to connect it to the proper device (eg: relay, fan, pump, gate, blind, …)

You simply have to create new connections.

The following incoming commands from other drivers are supported: OPEN, CLOSE, TOGGLE & TRIGGER.



The driver gives the possibility to use a single Control4 variable, called “CommandMask”, to control all relays. The variable is of type “string” and the message sent to the driver is composed by 8 characters. Characters must be 0 (ZERO) o 1 (ONE).

The composition of the string determines the device behaviour as follows:

The first character on the left controls the eighth relay, the second char on the left controls the seventh relay, ..., and the last char on the right controls the first relay.





Have fun with our Homemade Organic Drivers!