Integration of smart meter (conforming to IEC 62056-21, optical interface) into openHAB - challenge: interface must be battery operated and use RF

I would like to transfer the data from my smart meter (ISKRA, optical interface conforming to IEC 62056-21) into openHAB (openHABian, 3.2.0-SNAPSHOT - Build #2583, Raspberry Pi 4).

My requirements for the interface smart meter → openHAB are:

AFAIU, depending on the interface hardware chosen, the following technologies could be used for integration into openHAB:

  • Z-Wave Binding
  • ZigBee Binding
  • RFXCOM Binding
  • Smart Meter Binding
  • MQTT Binding
  • openHAB REST API

I’m open to suggestions for the hardware (DIY or COTS) - thanks in advance.

BTW, is anyone using this device: Electricity Meter Interface - smart Zigbee meter for home electricity monitoring - frient?
Edit: seems to be a rebranded Develco product: External Meter Interface - Real-time measurement