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tmo-live-graph
A simpe react app that plots a live view of the T-Mobile Home Internet Nokia 5G Gateway signal stats, helpful for optimizing signal.
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tmo-monitor
A lightweight, cross-platform Python 3 script that can monitor the T-Mobile Home Internet Nokia, Arcadyan, and Sagecom 5G Gateways for 4G/5G bands, cellular site (tower), and internet connectivity and reboots as needed or on-demand.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Like brimur mentioned, if you won't realistically need anything besides the UniFi controller, just run it off an existing computer or a Pi. If you want to monitor the trashcan, you can use tmo-live-graph - it doesn't show active traffic, but it does show signal information (which might be more useful in general).
For that, you should probably just use tmo-monitor, it would be easier.