No, not the usual "should I have them fitted?" vs "no they're insecure!" discussion ...
You may remember last year I opened up the in-house display for my smart meters, and using a digital scope found an SPI bus where I could "sniff" data between the main PCB and the RF transceiver daughterboard?
Well, today I finally got round to spending some time on it again, and I now have a working method to passively tap the bus using an ESP8266 based arduino-ish board and capture the raw data :-)
I don't think I've written an interrupt service routine for over 30 years ...