Spark flashes red when I try to subscribe to a webhook

[ScruffR]

I see, but as Kenneth said there too

@kennethlimcp

If you have a requirement that the device must first connect upon boot-up, you can add a Spark.connect() in setup().

This is the part I've coded out above to get rid of the red flash

After that you should be good to use your original code.

But my suspicion still stands

@ScruffR

I'm not sure if WiFi.off() would kill your subscription or not (could try myself - but you know ... ). But if it does, you'd have to resubscribe, but then I'm not sure how often you can, before running into troubles again.

I doubt WiFi.off() kills the suscription, but if it did, I'd expect resubscribing too often might bring in a problem.
I recall that there was some discussion about this, but I'd have to find that thread again.