Add additional fields for sensor identity and location

[Rollcloud]

Background

With more than one sensor sending data to the server, a method of separating the data belonging to specific sensors will be required. Meta-data specific to different sensors should also be recorded.

Request

• [ ] Add a database and server-API field to uniquely identify sensors
• [ ] Add and suitably handle meta-data field(s) to record:
  • [ ] Sensor location (room index or label)
  • [ ] Battery voltage or power level

[ClareGarrard]

Use UID for Pico devices:

https://forums.raspberrypi.com/viewtopic.php?t=309508

[ClareGarrard]

Could you add more detail about what you'd like for the voltage field? What is your use case?

[Rollcloud]

Sure, I would like to measure battery voltage as a function of time, so that I can monitor and reduce the power-consumption of battery operated sensors. This would be for debugging purposes, instead of environment monitoring.

For the voltage field, I think that a floating-point value (in Volts) would be a good initial place to start? This would allow the minimum required voltage to be measured before the Pico depletes battery and cuts out. This might not allow for direct comparison between different sensor hardware configurations, such as a percentage measurement might provide, but the min and max voltage levels will need to be measured before a percentage figure can be accurately calculated.