Connecting the Gateway to your home network (V1.9.5 firmware)


This page is for firmware version 1.9.5. If you have a Gateway with the new V2 firmware continue HERE.

After you connected the Gateway to your boiler and the LED lights up solid, you need to integrate the Gateway into your home network. To setup the Gateway you need a laptop or other computer with a web browser.


Do not use Safari or iOS, the current web interface won’t render at all or not properly.

Accessing the web interface of the Gateway

You need to change several setting in the web interface of the Gateway for it to connect to your home network. In order to do so, you need to access the web interface.

When you get it delivered, the Gateway is in its factory condition. At boot the Gateway will create a wifi network called ‘ems-esp’.

Connect to this network with a laptop. (Keep in mind as soon as you are connected to the ems-esp network, you cannot access the internet with the laptop.) Open a web browser and go to IP address

You will be asked for a password. The default password is ‘admin’.

You will now see a screen that resembles the following one:

Web interface main page

The main dashboard will give you an overview of what the Gateway has detected on the bus. If it has found a boiler, a thermostat and/or a mixer module it will show its main parameters.

It should show a green bar saying ‘EMS bus connected with both RX and TX active’. If it’s a red bar and its says ‘EMS bus connected but TX not active’ try reinserting the cable. If that did not help, just continue with the setup below, you might need to change the TX mode later on.

Making the appropriate settings

There are a lot of setting which are covered in the next chapters, but the first thing you want to do now is to set the Wi-Fi SSID and Wi-Fi password of your own home network. Click on ‘Settings’ and go to the menu item ‘Wireless network’.

Web interface wifi settings

Select ‘Client’ and click on ‘Scan’. You will get a list of all available Wi-Fi networks. Select the correct one or enter the details of your home network yourself. Click on ‘Save’. Now reboot the Gateway by clicking on ‘Reboot System’.

The Gateway will now try to connect to your home network. If successfull, you need to figure out the IP address it got from your home router. If unsuccesfull, the Gateway will return to AP mode after some time.

Finding the IP address of the Gateway

Now disconnect from the ems-esp network if you have not already done to and connect to your home network again.

Either log in to your router and look up the IP address of the Gateway or use f.i. the app ‘Fing’ on an Android phone to find the Gateway in your network. If you use Fing, the device will show as an ‘Espressif’ device with host name ‘ems-esp’. When you found the IP address of the Gateway you can open a browser and use that IP address to access the web interface.

Setting a fixed IP address

Set a fixed or static IP address for the Gateway in your router. Sometimes this is also called a DHCP reservation. This is necessary later on so that the home automation system will always be able to find the Gateway in your network.

Consult the manual of your router for instructions how to set a static IP address. Although not recommended, it is also possible to set a fixed IP address in the Gateway settings itself.