How to only accept mqtt json value if other attribute correct

Configuration
1

I’m having trouble trying to understand how to only use sensor mqtt messages that are of the correct type.

So I have topic/messages that look like:
emon/data {“type”:“power”, “pwr1”:688.0, …
emon/data {“type”:“totals”, “timp”:458782980, …

So for displaying the power I need to use only message where type == power and ignore the others.
Likewise for totals type and others.

I’m not sure that templating is quite the right place to filter the messages but I can’t even get that to work (probably because I don’t know how).

Any thoughts?

2

yes, templating is where it’s done.

{{ value_json.pwr1 if value_json.type == 'power' else 0 }}
3

Thanks. The syntax at least works. Problem is it doesn’t ignore where type != power it puts in zero (or blank if else clause is omitted). Is there a way to say “no change” as in else keep last value?

4

personally, i’d make separate topics for these devices instead of having a single topic for all devices. But if this is what you want then just get the state of itself.

{{ value_json.pwr1 if value_json.type == 'power' else states('sensor.xxx') | float }}
5

Interesting. Thank you very much.

BTW regarding topics, yes I agree but that stuff has been running for 6yrs or more whereas HA barely 24hrs.