RAK WisBlock M-BUS Adapter

So I got a new SmartMeter with wired M-BUS from our electricity supplier, but no hardware or software to read the energy data.

As a software developer I am not usually involved in hardware development, so it was a good opportunity to learn to develop something tangible (for a change) and burn my fingers on the soldier station (which of course I did), and yes, I know there are tons of solutions already out there, but isn't repetition part of learning?

My energy supplier was kind enough to provide me with a SmartMeter (L&G E450). So I was able to start developing the hardware and software in my lab. For the hardware, I found several reference schematics, especially for the TSS721A Single-Chip Meter-Bus Transceiver. For the platform I chose the RAK WisBlock IO Board sources where available, so I could start with Fusion360 and my first PCB.

After a few weeks I received my first PCB from the manufacturing service and started developing the software. An endeavour bound to fail without these great tools, many frameworks and forum posts around.

It has been a great experience and I am so grateful for all the information from the community that has helped me to build a hardware project. I am sure it will not be the last.