./sma2vz --help
   usage: ./sma2vz --vzurl=vzurl --cuuid_pwr=x --cuuid_kwh=y 
     [ --daytimeonly --lat=lattitude --lon=longitude]
     [--loop --delay=delay] 
    | [--help] 
    | [--configure] 
    
     --vzurl=<url> 
        volkszaehler middleware url  
    
     --cuuid_pwr=<uuid> 
        channel uuid for power (watt) PV output 
    
     --cuuid_kwh=<uuid>  
       channel uuid for energy (kwH) PV total 
 
     --daytimeonly
       do not post data at night (e.g. if your device does not supply data)

     --lon=<longitude>
       plant longitude geo coordinate

     --lat=<lattitude>
       plant lattitude geo coordinate
    
     --loop  
       poll SMA inverters in a loop  
    
     --delay=<secs>  
       how many secs to wait between each reading (default: 15 secs)
    
     --configure 
       create SMAsport configuration file(s) 
         modify ./sma2vz inverters shell function 
         here document to fit your plant's data