title: how to get "properties" through gdbus
body: <p>Can anybody tell me where I can find documentation on how to use gdbus call to get information from the system?</p>
  
  <p>I am following APIs here: 
  <a href="https://www.freedesktop.org/software/ModemManager/api/latest/gdbus-org.freedesktop.ModemManager1.Modem.html#gdbus-method-org-freedesktop-ModemManager1-Modem.Command" rel="nofollow">https://www.freedesktop.org/software/ModemManager/api/latest/gdbus-org.freedesktop.ModemManager1.Modem.html#gdbus-method-org-freedesktop-ModemManager1-Modem.Command</a></p>
  
  <p>and I want to read for example:  <br/>
  Model <br/>
  Revision <br/>
  State <br/>
  PowerState <br/></p>
  
  <p>etc.</p>
  
  <p>I was wondering how to create a call to get the "properties" out of the modem through gdbus</p>
  
  <p>Thanks</p>