Support avg reading of DiFluid R2 TDS

[graphefruit]

No description provided.

[zshenker]

Would you be open to a PR for this feature?

If so, any thoughts on how you are thinking this would work? Initially I'm thinking that hitting the test button would take a measurement and rather than replace the previous keep track of all values and update the average as the value stored.

Only thing that I'm thinking could be useful is some way to ignore/drop certain tests as I've found sometimes if I haven't let the sample cool enough a measurement can be a bit out of range from what I see on a later test. Maybe enough samples averaged out would account for one being off?

[zshenker]

@graphefruit ^

[graphefruit]

Would you be open to a PR for this feature?

Definitely.

If so, any thoughts on how you are thinking this would work? Initially I'm thinking that hitting the test button would take a measurement and rather than replace the previous keep track of all values and update the average as the value stored.
If I'm correct from the API its possible to do a single test or a multiple test: https://github.com/DiFluid/difluid-sdk-demo/blob/master/docs/protocolR2.md

From my perspective: I'd let the user choose what he would like to test, single or avg and then write the value to the field.