As mentioned before, if device ID does not work, try it with the serial:
resource: https://smart-me.com:443/api/DeviceBySerial?serial=yourserialhere
You’ll find your serial on https://webforms.smart-me.com
Hi everbody 
Got the smart-me module for kamstrup omnipower and have activated modbus.
Would one of you experts consider to make a real integration for HA on this Smart-Me/Kamstrup solution. Can’t get it up and running.
Would be greatly appreciated.
Thank you
Hello !
Just found this post and i made a custom integration via custom repository on HACS to integrate Smart-Me counter based on hostrup post.
you can find it here : ahokami/ha-smartme: HA integration for smartme counter
This is the first time i make something like that so sorry if it’s not properly published
Hello, i just made one. you can try it and tell me if it works