Support esphome format

[zoic21]

Hello,

I have lot of esphome device and I want to transfert data from esphome to prometheus, I try mqtt-exporter but format of mqtt message of esphome is not supported, example of topic : esp-weather-outdoor/sensor/temperature/state => 8.1

It's like <prefix>/<name>/sensor/temperature (shelly) but with state at the end.

Is it possible to handle that ?

Thank in advance.

[kpetremann]

hello @zoic21,

Sure, I can try.

I am not familiar with esphome: is the prefix always the same? has it a default value?

I will also check the documentation.

[kpetremann]

note: I cannot simply use "/state" suffix in the topic to identify esphome message. This would cause collision with other zigbee2mqtt messages, using state as a type of value (for an ON/OFF button for instance).

[zoic21]

Hello,

Yes it's always the same. Maybe to prevent issue with zigbee2mqtt you can add an env variable that indicates root topic of zigbee2mqtt?

Thank in advance

[kpetremann]

I agree, this was exactly my intent :)

I just needed to know if there was a default value. According esphome documentation, the default seems to be the node name. If the varenv is empty, it will not enter the esphome "parsing" function.

I'll push a commit for you to test tomorrow.

[kpetremann]

Hello @zoic21,

Please let me know if the code in the branch esphome works for you.

[zoic21]

Hello,

Thank it's work but how can I specify multiple esphome root topic. In Esphome each device create a topic in root of mqtt. For example I have 6 devices, each device have a "root" topic, ex : esp-weather-indoor/esp-weather-outdoor/....

[kpetremann]

this was my original question "is the prefix always the same?" :)

two options here:

• either all your topic starts with esp-, so you could simply set ESPHOME_TOPIC_PREFIX to esp-
• or, I do another change: ESPHOME_TOPIC_PREFIX becomes a list of topic prefixes

The second solution would be compatible with the first one.

WDYT?

[zoic21]

Hello,

Sorry I don't undertand "is the prefix always the same?", I think suffix... Sorry

For me second option is better, we can choose the preffix so list will be perfect. But if you can also handle esp-* it will be better.

[kpetremann]

Hello, no problem :)

I've updated the branch.

The varenv changed: ESPHOME_TOPIC_PREFIXES This is now a list: prefixes are separated by a comma.

For each prefix in the list, mqtt-exporter will check if the topic is starting by the prefix string.

For your example:

 esp-weather-outdoor/sensor/temperature/state => 8.1
 esp-weather-indoor/sensor/temperature/state => 20.0

you can either set: ESPHOME_TOPIC_PREFIXES="esp-" or: ESPHOME_TOPIC_PREFIXES="esp-weather-outdoor/,esp-weather-indoor/" or: ESPHOME_TOPIC_PREFIXES="esp-weather-outdoor,esp-weather-indoor" etc...

Please let me know if it works for you

[zoic21]

Hello,

Thank a lot !!!! it's perfectly works !!!! With that I can have all my mqtt data in grafana.

Thank a lot.

[kpetremann]

You are welcome :)

I'll merge that to the master branch later and it will be in the next release.

[kpetremann]

FYI it has been merged and officially released in the new v1.1.0.

Enjoy 🙂