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To read M-Bus on Pi serial port you need to swap serials...

To disable onboard Pi3 Bluetooth and restore UART0/ttyAMA0 over GPIOs 14 & 15 modify:

sudo nano /boot/config.txt

Add to the end of the file


We also need to run to stop BT modem trying to use UART

sudo systemctl disable hciuart

mbus-serial-scan-secondary -b 2400 /dev/ttyAMA0
... Found a device on secondary address 48420932EE212004 [using address mask 4FFFFFFFFFFFFFFF]

mbus-serial-request-data -b 2400 /dev/ttyAMA0 48420932EE212004