[fritz] Add roaming status and advanced LTE metrics for mobile routers (e.g., FRITZ!Box 6820)

[ctanno]

Integration name

FRITZ!Box Tools

Link to integration documentation on our website

https://www.home-assistant.io/integrations/fritz/

Describe the enhancement

Currently, the AVM FRITZ!Box Tools integration (fritz) provides great sensors for general connectivity and data usage. However, for LTE/5G routers like the FRITZ!Box 6820 LTE, it lacks sensors for mobile-specific metrics.

I tested the TR-064 API of my FRITZ!Box 6820 LTE using fritzconnection. The router actively exposes the roaming status and other useful mobile metrics under the service X_AVM-DE_WANMobileConnection:1 using the GetInfoEx action.

I would love to have these parameters exposed as binary_sensor or sensor entities. The most valuable additions would be:

• NewRoaming (True/False)
• NewCurrentAccessTechnology (e.g., LTE, UMTS)
• NewSignalRSRP0 (Signal strength)

Use cases

1. Cost Control / Roaming: Knowing whether the router is currently roaming is crucial to avoid unexpected data charges, especially when traveling or living near borders. This would allow users to create automations that disable heavy-bandwidth services (like camera streams, backups, or updates) when NewRoaming changes to True.

2. Connection Monitoring: Exposing NewCurrentAccessTechnology and signal strength (NewSignalRSRP0) allows users to monitor their connection quality in dashboards. Automations could send a notification if the router drops out of the fast LTE network and falls back to a slower connection type.

Anything else?

Here is the full, anonymized raw output of the GetInfoEx call from my FRITZ!Box 6820 LTE for reference. Since the integration would need to call this action for the roaming status anyway, the other parameters are readily available.

Raw output of GetInfoEx

NewSerialNumber: XXXXXXXXXXXXXXX
NewEnableVoIPPDN: False
NewPPPUsername:
NewPPPUsernameVoIP:
NewSoftwareVersion: 03.01.41.16
NewUptime: 62930
NewPDN1_MTU: 0
NewPDN2_MTU: 0
NewIMSI: XXXXXXXXXXXXXXX
NewAPN_VoIP:
NewAPN: gprs.swisscom.ch
NewRoaming: True
NewCurrentAccessTechnology: LTE
NewSignalRSRP0: rx2=-98,main=-98,rx1=-99
NewSignalRSRP1:
NewCellList: 31primarylte23001T-Mobile Czech RepublicXXXX161105095-7-98XXXXX-XX

[github-actions[bot]]

🏷️ I've automatically added the integration: fritz label to help categorize this feature request.

[Nurgus]

I have the 6890 LTE which has the feature of falling back to 4G when there's a connectivity issue with the main connection. I'd love for Home Assistant to be able to react when this happens.