[ianburrell]

Amazon Sidewalk uses BLE for short distances and LoRa for long distances. LoRa is seriously low bandwidth. The highest is 50 kb/s and that is for the shortest range and all users. BLE is higher bandwidth but requires having an Amazon device as gateway.

[SenAnder]

10 kB/s is 25 GB/month. That's a lot of telemetry going one way, and a lot of automatic content recognition signature updates going the other.

[ianburrell]

The Sidewalk bandwidth limit is 500MB/month. Per account not per device.

Also, the LoRa bandwidth is shared. It isn't 50 kbps per device but everybody within a mile or two. Also, the 50 kbps rate has a pretty short range. The normal, long range LoRa bandwidth is more like 5 kbps.

[judge2020]

For most people in high density housing (non-single-family), there's a pretty good chance someone with an alexa is within range, which means BLE communication is probable. But even for LoRa, a few KB of telemetry being sent every x hours is probably likely if a manufacturer ever integrates the radio - although the ROI might not be there if it can't handle carrying ads.

[rcme]

Low bandwidth is fine. One way that smart TVs track you is fingerprinting the audio that you're listing to, even turning on the microphone to do so. They do this to sell analytics on the content you watch. Audio finger prints are pretty tiny, and you could easily send periodic fingerprints over LoRa.