rtlamr
An rtl-sdr receiver for Itron ERT compatible smart meters
...One protocol in particular: Encoder Receiver Transmitter by Itron is fairly straightforward to decode and operates in the 900MHz ISM band, well within the tunable range of inexpensive rtl-sdr dongles. This project is a software-defined radio receiver for these messages. We make use of an inexpensive rtl-sdr dongle to allow users to non-invasively record and analyze the commodity consumption of their household. There's now experimental support for data collection and aggregation with rtlamr-collect.