Category: Arduino

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Echelon/NES Smart Meters connected to Cerius (zip code 4000-4999 in Denmark) – action required

Cerius logo

Cerius has informed us (dabbler.dk) that they are strengthening the security of the MEP port.

On May 6th, 2025, new meters will have their MEP port disabled as default. If you get a new meter and you need the MEP port, you will be able to request Cerius to activate it on their home page.

During May 2025 the MEP port of old/existing meters will also get deactivated. To prevent this please e-mail info@cerius.dk asking for your meter to be excluded from this. Include your meter number (on the face of the meter, typically close to the barcode). This e-mail needs to be received by Cerius no later than May 1st, 2025.
Note: If you miss this deadline, you will be able to request re-opening of your MEP port on the Cerius home page during May 2025.

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Echelon/NES Smart Meters – possible 0x0B / 0x0C bugfix?

Bugfix

Thanks to Reto (info@makerspace-reinach.ch) we might have a solution for a long standing bug.

If you are having issues getting reliable readings from the meter/module and getting errors / Meter responses like these from the module:

  • 0x0B Authentication failure
  • 0x0C Invalid sequence number…

Typically from these requests:

  • 0x30 Full Table Read 0x0017 BT23 Current Register Data
  • 0x30 Full Table Read 0x001C BT28 Present Register Data

…then you know have an option to update the software. Make sure to study the readme before fetching updated software from our GitHub (https://github.com/DabblerDK/MEP-SW-ESP32).

As I don’t have a meter I can test this on anymore (and even if I did have such a meter), this updated software is provided as is – ALL USE IS ON YOUR OWN RISK :-).

Please do let us know if you had issues before and this updated software solved it!

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Echelon/NES Smart Meters – probably our final post on this topic

Sad face

Today I got a bit of a surprise – without any warning my power distribution company changed my power meter from a NES Echelon meter to a Landis+Gyr E360 meter.

This means that I unfortunately have no way of testing and working on new hardware/software for our Dabbler MEP interface.

I hope someone else with access to a NES meter with a MEP interface will pick up the task and improve the hard- and software further.

We’ll continue to keep the Dabbler GitHub running on https://github.com/dabblerdk.

…and we’ll also keep the Documentation and message board GitHub we have setup in corporation with OSGP Alliance running: https://github.com/OSGP-Alliance-MEP-and-Optical.

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Echelon/NES Smart Meters – MEP interface modules is now available again from www.ustepper.com

uStepper

Thanks to our friends at www.ustepper.com hardware to IoT enable your NES/Echelon meter is now available again.

You can purchase it directly from their shop here: https://ustepper.com/shop/home/26-esp32-c3-dabbler-mep-interface.html

Note, although this is a completely redesigned hardware based on a different ESP32 module (it uses the ESP32C3 and not the ESP32-WROOM-32 of our original module), we have extended our software to also support the new hardware.

The source code is the same, and the board selection configures the software so i will run on the chosen module. Simply select the “ESP32 Dev Module” board for the “dabbler hardware” and the “ESP32C3 Dev Module” board for the “uStepper hardware”.

You will also need the .wwws files for both versions.

As always you can find our updated software on our GitHub here: https://github.com/DabblerDK/MEP-SW-ESP32

As always other small fixes and improvements were done and going forward we’ll plan to keep supporting both hardware versions.

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Echelon/NES Smart Meters – MEP interface modules will (hopefully) soon be for sale again

uStepper

As you might have discovered we recently shut down our sales of MEP interface modules and kits.

Our initial goals were to:

  • Get the MEP documentation and specs released for the public so everyone could tinker with the interface.
    We succeeded this almost a year ago, and as a bonus the IR interface documentation and specs were also released. You’ll find both on the GitHub we have setup for OSGP Alliance here: https://github.com/OSGP-Alliance-MEP-and-Optical
    Note: The OSGP Alliance is the global non-profit association dedicated to promoting the adoption of the Open Smart Grid Protocol (OSGP) and infrastructure for smart grid applications towards a future proof modern smart grid. Networked Energy Services (NES) is a member and chose that the documentation / specs should be released via OSGP Alliance.
  • Do a prototype implementation of a module that put the Echelon/NES meters online.
    Note: It was NEVER our intention to develop a finished consumer product, nor sell/distribute such products.
  • Get people involved in tinkering with the MEP interface – either by getting them to do their own projects or by getting them involved in developing “our” prototype further.

As you might know we had (and still have) a hard time getting more people involved, but we have had some community contributions to the code and inspiration stories. To try to push this further, we chose to do a “limited time offer” where you could buy either parts (kits) or assembled modules of our prototype.

Unfortunately the offer started just as Graves became a father and I got a new job. So we both had “real life” situations that demanded more of our time. Combined with a higher demand on the offer than expected, we had to extend the offer far longer than expected.

Our “limited time offer” had “limited effects” :-). We had hoped that someone would step in and start producing these modules, and although we had a few interested people contacting us, nothing happened that ended up in something we could refer others to. In the end we kind of gave up. Also we caught up with the initial demand for modules and started shutting down the offer. As usual we purchase too many parts, so it took some time before we were out. But we are now completely out of parts and don’t plan to buy any more.

Well, this “whining” is just to explain that it was neither (and never were) our intentions to bring this project further than to the prototyping state, nor our intentions to sell these modules and kits. We have full time jobs in “real life”, so we don’t want to start a business selling these modules (it won’t be viable without other products too – the demand for MEP modules is simply not high enough for this to happen).

Now for the good news! / we are happy to announce:

After shutting down our offer, we were contacted by a party that do run a business selling various electronic products – and they are currently working on a cost reduced version of the module. We have allowed them to build on our project free of charge and the plan is it will end up in a more or less compatible version running the same software (or a variant of it).

They are still in the development phase (there is a lot of work in bringing a tinkering prototype to a state where it can be produced and sold in an effective/viable manner), but they have allowed us to tell you about it and share their name.

If everything goes as planned you will soon be able to purchase a “Dabbler” MEP module variant from the Danish company uStepper. Stay tuned on both their website and our Blog!

ESP32-C3 dabbler MEP-Interface. Disclaimer: Everything is subject to change
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[Limited offer has now ended] Echelon/NES Smart Meters – MEP interfaces modules and kits

Limited Time Offer

Update as per 2023-03-30: We are out of PCBs and parts and are not planning to order any new ones.

The Limited offer has now finally ended. It has been running FAR longer than we expected due to high demand – we were simply not able to catch up, and when we did, we had some extra modules and kits we wanted to provide.

Anyway – everything comes to an end, and we simply don’t have the time to keep providing these kits and modules. We hope that someone else will pick up this task – and we will be happy to refer/forward any requests etc…

Remember all Hard- and Software is (and will continue to be) available on our GitHub here: https://github.com/dabblerdk

Below you’ll find the original text of this entry along with the comment section:

This is a follow up on our previous Echelon/NES Smart Meter post.

We have released all our Hard- and software on GitHub here: https://github.com/dabblerdk, so your cheapest way of getting started if you have soldering skills is to order a PCB and components – and start building your own modules.

We hope that someone will pick up the task of producing/selling kits and assembled modules, but we have decided to offer some ourselves for a limited time to get more people involved.
Note: The price is set so others will have a chance of under-bidding us, that is on purpose.

If you buy one of our modules we expect you to participate in the project in some way. It could be as simple as write your story/experience about the project (as a guest writer on www.dabbler.dk or on the OSGP Alliance GitHub site), or if you have the skills you can help develop/improve the hard- and software.

We have two options:

  1. The MEP module as a kit, all components included. The ESP32 is a 16MB version.
    You are required to have the tools and skills, to assemble the PCB, adjust the buck converter and program the ESP32.
    The PCB/components are classic through-hole-technology (THT) so you don’t need to have good SMD skills.
    But note that the ESP32 is a separate PCB with castellated holes (that is kind of like SMD).
    As the module is NOT assembled, we cannot test it or install the software. You’ll have to do that yourself.
    Price: 300 DKK including freight in Denmark (payment due before shipment (bank transfer, PayPal or Mobile Pay).
  2. An assembled MEP module. The ESP32 is a 16MB version.
    The Module is flashed and should boot into Access Point mode when mounted in the Smart Meter. You should then be able to go to the homepage of the module and configure it to use your WIFI. Here you will also be able to enter the MBK key you got from your Power Company.
    PCB and components are mostly classic through-hole-technology (THT), but the ESP32 is a board with castellated holes.
    We might also choose to provide SMD versions at the same price depending on component availability. You will be asked if SMD is OK with you before shipping.
    Before shipment we will make sure the module boots correctly in our Smart Meter, but we won’t perform a long/extensive test of the module.
    Price: 500 DKK including freight in Denmark (payment due before shipment (bank transfer, PayPal or Mobile Pay).

IMPORTANT:
This is a prototype project without ANY form of warranty. Any use of this module is your risk and costs!
We cannot gurantee delivery times as we purchase most components from China to keep the cost low. Delivery times may vary from 0 to 2 months or in special cases even longer.

NOTE:
AS we currently have no experience with the IR solution, we will NOT be providing any hard- or software for that at this point.

ORDERING:
Please send an e-mail to gert@dabbler.dk and graves@dabbler.dk, stating if you want a kit or an assembled module. Also state your shipment address.

Please let us know if you have any questions.

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[Breaking News] Echelon/NES Smart Meters – Documentation for MEP and Optical interfaces have been released on GitHub!

Breaking News!

It is with great pleasure we finally can announce the release of the following official OSGP Alliance documentation for OSGP Smart Meters (i.e. Echelon/NES Smart Meters):

  • The Multipurpose Expansion Port (MEP) interface and protocol
  • Optical interface and protocol

You will find the PDF files in the Documentation repository at GitHub using this link: https://github.com/OSGP-Alliance-MEP-and-Optical.

Thank you for your patience, we know this have been under way for almost two years.

Now, go ahead, please start Tinkering now! 🙂

Note: The hard- and software we’ve been tinkering with is not finished (probably will never be finished as it is a tinkering project 🙂 ), but we’ll get it released ASAP so others can get inspired or join as they wish.

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Echelon/NES Smart Meters – dabbling the hardware v1.10 and v2.00

PCB v1.10 and 2.00

Our software fix for the (fake?) MAX3232 hardware issue seems to solve the issue completely.

It is still a rough implementation in the software (using delays), so we’ll have to improve on that later on… It is probably not that big of an issue – because when a MAX3232 starts to behave, it seems it continue that way for a long time…

Next step is then off cause a new hardware prototype PCB, but why not add a few things like:

  • R3 & R4: a few resistors so one can chose if our software fix for the (fake?) MAX3232s should be used (0 ohm R4 installed) or not (0 ohm R3 installed). You might even chose to use a higher resistor value if that works for you. You should only install either R3 or R4 – NOT BOTH!
    Note: If you don’t have 0 ohms resistors, just bridge the pins.
  • R5, R6 & R7: a few resistors on the MAX3232 pins so you have the option to see if your MAX3232 works better if you add some higher resistor values to the pins. If not, you can just install 0 ohm resisters or bridge the pins…
  • …and let us move to SMD now we are at it (actually we also have a PCB version 1.10 which is classic THT (Through Hole Technology) as the earlier versions.

The schematics now looks like this:

Hardware version 1.10 and 2.00 schematics

A 3D rendering of the PCB (for some reason without a 3D MAX3232) looks like this:

ESP32 MEP PCB v2.00 (SMD) - front
ESP32 MEP PCB v2.00 (SMD) – front
ESP32 MEP PCB v2.00 (SMD) - back
ESP32 MEP PCB v2.00 (SMD) – back

The idea around putting C1 – C5 on the back is to shorten the traces from the MAX3232 (supposedly that is also better according to it’s datasheet… But what do we know – we are software guys 🙂 )

We’ve just received the PCBs from JLC PCB (no, they are not a sponsor – we pay for this), but have not had time to populate nor test them yet…

You can see the received PCBs in the feature image of this blog entry.

Stay tuned for more news regarding this project – only on www.dabbler.dk…

Note: We are still waiting for NES to release the MEP protocol specifications…

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Echelon/NES Smart Meters – the software solution to a hardware issue

Well, we warned you that software guys like us tend to come up with software solutions – even for hardware problems.

As expected, no electronic engineers reached out to us with a solution for our (probably fake) MAX3232 issues, so we had to come up with a solution ourselves…

That is off cause ok – and with the help of a cut PCB trace:

Hardware v1.03 - cut trace to solve MAX3232 issues
Hardware v1.03 – cut trace to solve MAX3232 issues

… and a bodge wire:

Hardware v1.03 - bodge wire to solve MAX3232 issues
Hardware v1.03 – bodge wire to solve MAX3232 issues

… it seems we can persuade the MAX3232’s to play along.

This is off cause a temporary solution to test this fix – we need a new PCB prototype version if this works.

Note: You will find others struggling with similar MAX232/3232 issues on the Internet. Some are able to solve it with larger decoupling capacitors and some with resisters on the power pin – but that did not work for us.

Our implementation is simply adding control of the power to the MAX3232 through software. When it mis-behaves we punish it by turning it off for a while. Then back on until it behaves…

Note: the max current a ESP32 digital pin can supply seems to be around 40mA and the max consumption of a MAX3232 is around 1mA. So we should be safe doing this “hack”…

If you are an electronic engineer you are probably finding this solution fun – but it seems to be working :-).

While we are still waiting for the MEP Protocol specification to be released (and our NDA to be lifted), we’ll try to keep your entertained with more blog entries.

Stay tuned to www.dabbler.dk…