Broadband just show 0,0
**Describe the bug**
Broadband shows just Download / Upload 0,0 in Eve App

Homebridge Fritz Platform v5.0.20 / v5.0.21 / v5.0.22
Plugin Settings
Device "Master Device"
 - Options
 - Broadband - Characteristic   (not None)

**To Reproduce**
Steps to reproduce the behavior:
1. Go to Eve App
2. Click on Rooms / Fritz!Box Status (ON/OFF)
3. Scroll down to Download / Upload
4. See Status 0,0

**Smartphone (please complete the following information):**
iPhone v14.4
HomePod Mini Steuerzentrale v14.4
eve app v5.0.1
Homebridge v1.1.7 / v1.3.1 
Fritz!Box 7590 v7.21 / v7.25
