I've tested my Smart Water Meter Sensor for 2 weeks already and didn't miss any count! It follows perfectly my water meter.

Battery usage is still a problem: I am at 91% of the original capacity or 2,973V for 2 AAA batteries. This is a lot, of course. I've changed the firmware:

• Increase buffer time from 1 to 5min: this means data is sent at most every 5 minutes
• Increase battery/configuration check from 1 to 4 hours

I hope this will be enough to keep battery going for longer time. If not, I still can increase buffer time to 15 or 30 minutes. 1 hour sounds extreme to me, but will see. Data is sent only if water is used, of course.

Other big news: all the design files for ZigBee Microcontroller are now in the GitHub repo:

https://github.com/pifactory/watermeter

PCB, schematic, firmware, device configuration file for Zigbee2MQTT: all of it. Check it out and ask me any questions you might have