When may setNodeProperty() be invoked?

[jpmens]

First of all, thank you for building Homie-ESP8266; this is grand.

Assuming I want to add a property to a node to indicate the unit, I tried doing

Homie.setNodeProperty(tempnode, "unit", "C", true);

in setup(), just before registerNode(), just after, and after Homie.setup(), none of which works. The only place I seem to succeed in seeing this property is if I add it to a loop handler, which is a shame, as it's a one-time only constant property.

Am I holding it incorrectly? :-)

[marvinroger]

Thanks a lot. :)

Perfect timing, I've just updated the temperature example with what you want! What you need is setSetupFunction().

To answer to your question, the setNodeProperty() function can be invoked when the device is in normal mode and connected to both the Wi-Fi and MQTT broker. The setupFunction and loopFunction that you can register are called when this condition is true.

[jpmens]

I've built and uploaded your temperature example, but I don't get a unit:

devices/0d87bde0/$nodes temperature:temperature
devices/0d87bde0/$online true
devices/0d87bde0/$name Bookshelf
devices/0d87bde0/$localip 192.168.1.192
devices/0d87bde0/$fwname awesome-temperature
devices/0d87bde0/$fwversion 1.0.0
devices/0d87bde0/$signal 92
devices/0d87bde0/temperature/temperature 22.00

In the Arduino IDE's serial monitor I see

Attempting to connect to Wi-Fi
Attempting to connect to MQTT
Sending initial informations
Sending Wi-Fi signal quality
Temperature: 22.00 C

[marvinroger]

Oh, you're right. Let me take a look at it.

[jpmens]

I think it's the same issue I had earlier: a Serial.print() in setupHandler indicates it's being called before the MQTT connection is up.

[marvinroger]

Could you please try again with the latest git rev?

[jpmens]

Works like a charm:

devices/0d87bde0/temperature/unit c
devices/0d87bde0/temperature/aaaaaaa AAAA

Thank you for fixing this so quickly.

[marvinroger]

Great, my pleasure!