Does anyone know of a way to code for one photon to see if another is online?
For example, one of my Photons logs temperature data (I’m using ThingSpeak to handle the data.). That Photon is outdoors on a solar panel/battery setup.
My other Photon pulls that temperature data from ThingSpeak and puts it on a display.
Sometimes the battery dies on the outdoor board and the board goes offline. When that happens, my display just keeps showing the last posted data to ThingSpeak.
I’d like my display to post a message warning me when data hasn’t been updated in a while. That might be complicated code though and I’d be happy just to have a message that says the outdoor board isn’t communicating. Any ideas?