I did a quick search for this device here in the community and didn’t find anything. My propane tank has an EnerTrac 5922 level sensor and transmitter on it. The FCC info points to it having a broadcast frequency of 902.3-927.5 MHz. According to the device manual, it transmits once every 10 minutes.
I’m wondering if anyone has sniffed that out and been able to intercept the signal to pull the current tank level into HA.