This is just kind-of low-power. Some microcontrollers (e.g. PICs) can have sleep consumptions measured in nanoamperes. Months to years on a coin cell... just, they would need an external wifi module, which is highly inconvenient.
replyThat's not lower power, is it? E.g. RuuviTags can run 3 years or longer while sending sensor data 2.5 times per second, with a single CR2477 (3V 1000mAh). A single AA alkaline battery has 1.5V and 2100-2700 mAh (https://batteryskills.com/aa-battery-comparison-chart/ , somehow this data was difficult to find so I'll add this link :)).
replyBluetooth is lower energy than WiFi, but in your scenario the energy used for the radio is quite low anyway.
nRF52832 are famous for their low energy usage, it's hard to compete with them. However, ESP32 is much more universal.
replyDo you have an example of such a setup handy?
reply[dead]
reply