This weekend while I upgraded a Core (0.3.4) to a Photon (0.4.6), I noticed a strange behavior with the Publish/Subscribe system that I figured is worth mentioning.
I had a Core which was listening to my HVAC's thermostats. Whenever a thermostat called for heat/cool/fan, my Core would Publish a message like this:
Spark.publish("hvac_z1", "off", PRIVATE);
Then I had 2 Photons that listened for this event using the following code:
Spark.subscribe("hvac_z1", hvacHandler);
This all worked great until I upgraded the Core. Once I upgraded to Core to a Photon (with the exact same code) my Photons that Subscribed to the events failed to receive them.
Following this I pulled up http://dashboard.particle.io to check if the events are being fired. And sure enough, the events showed up.
After digging around, I set my Subscribe code like this:
Particle.subscribe("hvac_z1", hvacHnd, MY_DEVICES);
And the events started firing again.
Again my issue is resolved, but I found it odd that changing the hardware would cause an issue like this.