@mfalkvidd Thank you for answer. Yes, I am using a library for the ATM90E26A that is in github written by Tisham Dhar whatnick it support UART and SPI for this chip but not softSPI.
I was making some code experiments using other softSPI libraries trying to combine them to make the ATM90E26A works with softSPI. I tried to use also digitalIO and other for RFID using SoftSPI, no successful and probably I will have to contact to Tisham Dhar for SoftSPI implementation in the ATM90E26A library.
I was thinking (when I design the PCB) is to use the MySensors Soft_SPI feature to read the energy chip, but now as you said, I understand it need to be supported in the ATM90E26A library and not in the MySensor library. Anyway if anyone of you has any idea please let me know, I will be happy to try it. If the ATM90E26A library got softSPI support I will update this post. Many thanks.