I’m running 0.4.4 on a Photon. I’ve been testing what happens to Spark.publish() calls when my WiFi network goes down. I unplug my router, what a bit, then plug it back in. I’ve had a lot of different behaviors; I have not characterized them all yet.
One time the Photon came up and then blinked the Red SOS followed by 1 red blink.
The documentation describes 2 and 3 flashes (https://docs.particle.io/guide/getting-started/modes/photon/) what does one red flash mean?