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homieiot / homie-esp8266

💡 ESP8266 framework for Homie, a lightweight MQTT convention for the IoT
http://homieiot.github.io/homie-esp8266
MIT License
1.36k stars 308 forks source link

Get retained value #217

Closed AllanMar closed 7 years ago

AllanMar commented 7 years ago

I'm working on an IR Node but I need to know the last state. I was thinking about just saving them on the ESP (EEPROM/SPIFFS) but then I thought perhaps it would make more sense to load the retained value from MQTT instead... I can't seem to determine any "clean" way to fit this into the current framework though. Any suggestions? Would this be something considered in the future?

marvinroger commented 7 years ago

That's why /set topics must be sent as retained, so that you can receive it on boot. What's wrong with this approach?

marvinroger commented 7 years ago

Oh, you mean the value on the property topic, not on the /set topics, and indeed the /set topics might be out of sync with the property value.

I can't think of a clean way to do this, just like you. I guess storing the value locally would be safer. For example, for my roller shutters (which I can set at a given percentage), I store the current percentage on the EEPROM.

AllanMar commented 7 years ago

Yes, I was referring to the property topics. I'll just deal with it with EEPROM, sometimes the most obvious way is the best way.

Thanks and great project here!

rigorm commented 7 years ago

Hi Marvin,

Your project would be a good exemple to put on the example page.

maybe not Homie specific but still. Could be useful to show how to use the EEPROM/SPIFFS..

a striped down version

what do you think ?

J-F

--------- Original Message --------- Subject: Re: [marvinroger/homie-esp8266] Get retained value (#217) From: "Marvin Roger" notifications@github.com Date: 11/15/16 5:34 am To: "marvinroger/homie-esp8266" homie-esp8266@noreply.github.com

Oh, you mean the value on the property topic, not on the /set topics, and indeed the /set topics might be out of sync with the property value. I can't think of a clean way to do this, just like you. I guess storing the value locally would be safer. For example, for my roller shutters (which I can set at a given percentage), I store the current percentage on the EEPROM.

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