# Compatibility between Landis and Gyr Smart meter (model E450) and Homey dongle **URL:** \ **Category:** Energy\ **Created:** [March 25, 2025, 2:45pm UTC](https://community.homey.app/t/compatibility-between-landis-and-gyr-smart-meter-model-e450-and-homey-dongle/133455 "2025-03-25T14:45:18Z")\ **Posts on this page:** 16\ **Page:** 1
**Author:** ![Gervais\_Chapuis](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/gervais_chapuis/32/121598_2.png) [@Gervais\_Chapuis](https://community.homey.app/u/Gervais_Chapuis)\ **Post date:** [March 25, 2025, 2:45pm UTC](https://community.homey.app/t/compatibility-between-landis-and-gyr-smart-meter-model-e450-and-homey-dongle/133455/1 "2025-03-25T14:45:19Z")
I wonder if the Landis and Gyr smart meter E450 is compatible with the Homey dongle? This dongle is suppose to be connected to the P1 port of the type RJ12. However, on the description of the SM E450 I rather see a P2 port? Here is a picture of the SM E450 ![mode emploi LG E450_Page_1](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/2/8/28eae297483667ebaefe78f3372da281616a9146.jpeg) Many thank for your help ---
**Author:** ![JPe4619](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jpe4619/32/9017_2.png) [@JPe4619](https://community.homey.app/u/JPe4619)\ **Post date:** [March 25, 2025, 2:57pm UTC](https://community.homey.app/t/compatibility-between-landis-and-gyr-smart-meter-model-e450-and-homey-dongle/133455/2 "2025-03-25T14:57:06Z")
As an alternative for P1, yo can use the blinking LED, there are devices for that to read-out. ![image](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/f/1/f12e2b88c47abd04ab03e251186b83f1d403a27a.png) ---
**Author:** ![ChrisG](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/chrisg/32/8825_2.png) [@ChrisG](https://community.homey.app/u/ChrisG)\ **Post date:** [March 25, 2025, 3:15pm UTC](https://community.homey.app/t/compatibility-between-landis-and-gyr-smart-meter-model-e450-and-homey-dongle/133455/3 "2025-03-25T15:15:29Z")
You will probably find a product here:: > **[gPlug - Der IoT-Adapter für Smart Meter in der Schweiz](https://gplug.ch/)** > > Der gPlug ist ein kleiner und preiswerter IoT-Adapter, um Ihre Energiedaten über die lokale Kundenschnittstelle eines Smart Meters auszulesen. > **[gPlugM - Der IoT-Adapter für L&G Smart Meter mit M-Bus CII](https://gplug.ch/produkte/gplugm/)** > > Mit dem IoT-Adapter gPlugM für schweizer L&G Smart Meter mit M-Bus CII binden Sie ihre Energiedaten in Echtzeit in Ihre Smart Home Lösung ein. ---
**Author:** ![Gervais\_Chapuis](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/gervais_chapuis/32/121598_2.png) [@Gervais\_Chapuis](https://community.homey.app/u/Gervais_Chapuis)\ **Post date:** [April 3, 2025, 9:08am UTC](https://community.homey.app/t/compatibility-between-landis-and-gyr-smart-meter-model-e450-and-homey-dongle/133455/4 "2025-04-03T09:08:59Z")
many thanks for your helpful suggestions. There is one point which is not clear to me yet. Assuming that i use the GplugM dongle, I would like to monitor my energy consummation for one full day. Would I need some additional device like a computer or disk ro store all the data delivered by the Smart meter? Or I am missing some information in the use of the dongle? your help on this would be greatly appreciated ---
**Author:** ![ChrisG](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/chrisg/32/8825_2.png) [@ChrisG](https://community.homey.app/u/ChrisG)\ **Post date:** [April 3, 2025, 9:44am UTC](https://community.homey.app/t/compatibility-between-landis-and-gyr-smart-meter-model-e450-and-homey-dongle/133455/5 "2025-04-03T09:44:03Z")
No idea, you have to ask the manufacturer of the dongle… ---
**Author:** ![JPe4619](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jpe4619/32/9017_2.png) [@JPe4619](https://community.homey.app/u/JPe4619)\ **Post date:** [April 3, 2025, 2:35pm UTC](https://community.homey.app/t/compatibility-between-landis-and-gyr-smart-meter-model-e450-and-homey-dongle/133455/6 "2025-04-03T14:35:03Z")
Guess the app power by the hour wil be compatible. ---
**Author:** ![tlink](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/tlink/32/120666_2.png) [@tlink](https://community.homey.app/u/tlink)\ **Post date:** [September 12, 2025, 3:54pm UTC](https://community.homey.app/t/compatibility-between-landis-and-gyr-smart-meter-model-e450-and-homey-dongle/133455/7 "2025-09-12T15:54:13Z")
@Gervais_Chapuis Did you finally get the gPlugM? How’s your experience? The L+G e450 has a M-Bus which isn’t compatible to the Homey Energy Dongle. According to my energy provider the gPlug **M** or whatwatt are compatible (as the manufacturer sites confirm). There’s a guide on how to connect to Homey that looks manageable… > **[Integration gPlug in Homey](https://gplug.ch/blog/integration-gplug-in-homey/)** > > In diesem Beitrag zeigen wir Ihnen Schritt für Schritt, wie Sie den IoT-Adapter gPlug mithilfe des MQTT-Protokolls in das Smart-Home-System Homey integrieren. There’s no similar description to the whatwatt but it has MQTT as well and there’s a HomeAssistant Guide for this. > **[whatwatt\_Go\_HomeAssistant\_v1.4.pdf](https://files.whatwatt.ch/whatwatt_Go_HomeAssistant_v1.4.pdf)** > > 1062.73 KB ---
**Author:** ![tlink](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/tlink/32/120666_2.png) [@tlink](https://community.homey.app/u/tlink)\ **Post date:** [September 12, 2025, 3:59pm UTC](https://community.homey.app/t/compatibility-between-landis-and-gyr-smart-meter-model-e450-and-homey-dongle/133455/8 "2025-09-12T15:59:21Z")
That was a fast answer by whatwatt: > 12 Sep 2025 > … > The Homey integration is available as a trial version. The integration was created by Homey itself and we have not yet tested it. > > That’s right, you need to have a whatwatt Go and a Plus license. All customers who purchase whatwat Go before we activate the licensing (around January 10) will receive the PLUS license free of charge. > > As soon as we have tested Homey ourselves, we will make an official announcement. > … I’ll go with this one as it supports both P1 and M-Bus besides others. ---
**Author:** ![Gervais\_Chapuis](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/gervais_chapuis/32/121598_2.png) [@Gervais\_Chapuis](https://community.homey.app/u/Gervais_Chapuis)\ **Post date:** [September 18, 2025, 7:20am UTC](https://community.homey.app/t/compatibility-between-landis-and-gyr-smart-meter-model-e450-and-homey-dongle/133455/9 "2025-09-18T07:20:03Z")
I did not pursue my connection with the Mbus and the g’lug model. This see mes qui te complex for me I am glad to hear about the new device which could be compatible with Homey. Would be ready to install this device once it has been testés for the Mbus ---
**Author:** ![tlink](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/tlink/32/120666_2.png) [@tlink](https://community.homey.app/u/tlink)\ **Post date:** [September 18, 2025, 9:58pm UTC](https://community.homey.app/t/compatibility-between-landis-and-gyr-smart-meter-model-e450-and-homey-dongle/133455/10 "2025-09-18T21:58:30Z")
I can confirm that it works. And installation is ready for normal users. Whatwatt comes with an app that guides you through the process. The Homey app is as easy to install. I had two issues in the first days that could be fixed with a restart of the app. This is how it look once installed ![IMG_2134](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/3/4/3458dc3b1413e0a7161cafc946b3868a5f118de6.jpeg) ![IMG_2137](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/4/6/465bbf712d341ee4debfc50bdda2185a8d2b7d7b.png) ![IMG_2136](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/d/a/da917612a905cf38a7cb65402148c29b3786425a.png) ![IMG_2135](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/9/6/963ebfe73fc017049146a730d36ffeda2abc39cf.png) ---
**Author:** ![Gervais\_Chapuis](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/gervais_chapuis/32/121598_2.png) [@Gervais\_Chapuis](https://community.homey.app/u/Gervais_Chapuis)\ **Post date:** [September 19, 2025, 6:35am UTC](https://community.homey.app/t/compatibility-between-landis-and-gyr-smart-meter-model-e450-and-homey-dongle/133455/11 "2025-09-19T06:35:20Z")
Many thanks for your message. Indeed this looks very useful. Time to install it. Cheers ---
**Author:** ![Rick\_D](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/rick_d/32/143953_2.png) [@Rick\_D](https://community.homey.app/u/Rick_D)\ **Post date:** [September 22, 2025, 8:12am UTC](https://community.homey.app/t/compatibility-between-landis-and-gyr-smart-meter-model-e450-and-homey-dongle/133455/12 "2025-09-22T08:12:40Z")
I have the gplugm in use (I wrote the above mentioned guide for gplugm and homey) 😁 If someone has questions - happy to help The implementation is manual work with virtual devices. But once done it works smooth. ---
**Author:** ![Gervais\_Chapuis](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/gervais_chapuis/32/121598_2.png) [@Gervais\_Chapuis](https://community.homey.app/u/Gervais_Chapuis)\ **Post date:** [September 25, 2025, 1:56pm UTC](https://community.homey.app/t/compatibility-between-landis-and-gyr-smart-meter-model-e450-and-homey-dongle/133455/13 "2025-09-25T13:56:40Z")
Many thanks for the Information on whatwatt and E450. I was less lucky with my Installation. Did install whatwatt according to the procédure. Once it was set up I did not get any information from my E450. Is it die to the fact that I don‘t have a SIM Card? Gervais ---
**Author:** ![tlink](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/tlink/32/120666_2.png) [@tlink](https://community.homey.app/u/tlink)\ **Post date:** [September 26, 2025, 5:33pm UTC](https://community.homey.app/t/compatibility-between-landis-and-gyr-smart-meter-model-e450-and-homey-dongle/133455/14 "2025-09-26T17:33:20Z")
Hi there’s no need for a SIM card”. The device is using your internet connection via WiFi (or ethernet) I assume that you need to request “activation” of the interface with your provider. ---
**Author:** ![Gervais\_Chapuis](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/gervais_chapuis/32/121598_2.png) [@Gervais\_Chapuis](https://community.homey.app/u/Gervais_Chapuis)\ **Post date:** [September 26, 2025, 5:55pm UTC](https://community.homey.app/t/compatibility-between-landis-and-gyr-smart-meter-model-e450-and-homey-dongle/133455/15 "2025-09-26T17:55:19Z")
Thanks for the info concerning the SIM cars. I did receive from the Industrial services of Lausanne (SIL) the permission to access the data of the E450 including the encoding key. Apparently the whatwatt recognize the E450 but complains that no data are receive. Did send a new request to the SIL. Waiting for their answer Gervais Chapuis ---
**Author:** ![tlink](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/tlink/32/120666_2.png) [@tlink](https://community.homey.app/u/tlink)\ **Post date:** [September 29, 2025, 11:26am UTC](https://community.homey.app/t/compatibility-between-landis-and-gyr-smart-meter-model-e450-and-homey-dongle/133455/16 "2025-09-29T11:26:54Z")
FYI I have not set an encoding key.