root@plex:~# wmbusmeters --robot=json auto WaterMeter multical21 <id> <key>
{"media":"cold water","meter":"multical21","name":"WaterMeter","id":"58079516","total_m3":4.749000,"target_m3":0.000000,"flow_temperature":127,"external_temperature":127,"current_status":"","time_dry":"","time_reversed":"","time_leaking":"","time_bursting":"","timestamp":"2019-01-23T16:10:42Z"}
{"media":"cold water","meter":"multical21","name":"WaterMeter","id":"58079516","total_m3":4.749000,"target_m3":0.000000,"flow_temperature":127,"external_temperature":20,"current_status":"","time_dry":"","time_reversed":"","time_leaking":"","time_bursting":"","timestamp":"2019-01-23T16:12:18Z"}
{"media":"cold water","meter":"multical21","name":"WaterMeter","id":"58079516","total_m3":4.749000,"target_m3":0.000000,"flow_temperature":127,"external_temperature":20,"current_status":"","time_dry":"","time_reversed":"","time_leaking":"","time_bursting":"","timestamp":"2019-01-23T16:13:54Z"}
Looks good!
Would have been cool if this was implemented as a HA plugin, but I guess I can MQTT it.