You can monitor up to 100 sensors (measuring points) without any cost.
Sadly, PRTG Network Monitor does not offer sensors for monitoring AVM Fritz!Box SmartHome devices. So here's a Script to build a " SourceForge PRTG Network Monitor - Download and install now - Paessler download prtg sourceforge
PRTG (Paessler Router Traffic Grapher) is an all-in-one network monitoring solution designed for Windows. It covers up/downtime, traffic, usage, SNMP, NetFlow, and packet sniffing, allowing for in-depth analysis and reporting. You can monitor up to 100 sensors (measuring
Unlike restricted "lite" versions of other software, PRTG Freeware includes all features: NetFlow, SNMP, WMI, dashboards, and alerts. and packet sniffing