Welcome, Jonatan, to the OEM forum.
Until the CM software is officially adopted for the emonPi, then I’m afraid you’ll need to continue to rewrite the “emon” CM software in the Atmel '328P front end, because the default is to always overwrite it with the “new” update (but it isn’t ‘new’ to you, it’s an update to the discrete sample version).
I don’t know what’s on Github (I’ve tried but I can’t understand it), the release and as far as I know, the up-to-date version is here: The emonPiCM
Note, ANY sensor node working to the emonPiCM will need its software changing, according to that post.
I don’t think there’s any problem with the CM software, however it might be a good idea to fire up your system using the installed software, just to prove it works, before you change anything.
Also note, I can only support the Arduino IDE for compiling and uploading the sketches.
So:
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Buy the USB to UART lead for flashing emontx - Correct
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Update emonTX to the “rfm69nTxLib” firmware (incompatible radio format with historic jeelib format)
(ref. Update to 3-Phase PLL sketch - #22 by Robert.Wall) Only if you have a 3-phase supply. You haven’t put where you are in the world, so I can’t guess. -
Flash emonpi to the “Native RFM68 (New)” Firmware
(in the web U emonpi/admin/update) I don’t know that this is the correct front end software, I proceed as I’ve noted in the post where the software was released - linked above, using Remmina (other tools are available) to transfer the file to the emonPi. -
Edit the emonpi emonhub config… You’ll find details of the config file entry at the top of each sketch - for the sensor nodes as well as the emonPi’s front end itself.