Not working when fritzbox connected to inet via second router lan
If the fritzbox gets internet via a second router's (non fritz lte router here) lan or wifi connection, the plugin doesn't work. If type "repeater" is used, it asks for a master device, even if the box is the master. 
If box type is "dsl" or "cable", it throws this error:
```
569Z FritzPlatform Error: read ECONNRESET at TCP.onStreamRead (internal/stream_base_commons.js:200:27)
```
**To Reproduce**
Steps to reproduce the behavior:
See above

**Expected behavior**
Would be great if the plugin has an option for type: "lan" and/or "wifi"

