Add support for more IPSO objects.

[ofauchon]

Hi. @johanstokking , @calvernaz.

I'm using your library in my Lorawan connected devices (TinyGo based code)

Now, I need more types of measurements (power related : voltage, intensity power) for monitoring power inverters.

I can see these types of objects exists in IPSO object Registry

https://technical.openmobilealliance.org/OMNA/LwM2M/LwM2MRegistry.html
https://github.com/OpenMobileAlliance/lwm2m-registry

• ID=3316 : Voltage/Volts
• ID=3317 : Current/Amps
• ID=3318 : Frequency/Hz
• ID=3328 : Power/Watt

Do you think I can propose a PR for supporting these extra measurements:

• AddVoltage()
• AddCurrent()
• AddFrequency()
• AddPower()

Maybe we could also think about a more generic API like:

• AddCustomMeasurement(IPSO_Object, Value)

Thanks for your help,

Olivier

[johanstokking]

Hmm, I'm not sure if defined IPSO objects should automatically be used in CayenneLPP. We don't know the data size or the data resolution. Therefore we follow https://community.mydevices.com/t/cayenne-lpp-2-0/7510.

I would suggest filing this with myDevices.