Tracking down semaphore problems

#1

1) Give a description of the problem
I’ve been noticing a number of ‘waited at semaphore’ messages in the logs for some of my pistons. These semaphores have been popping up, even in very basic Pistons. I don’t think I have too busy of a home automation network, so unsure why these are occurring. I have a couple of smart plugs, but notice that they spam the IDE with power change messages - not sure if that’s something that should be looked at?

I’m curious if semaphore waits are specific to webcore, or if this is something I can track down these in the smartthings IDE?

#2

Still hoping to get a little input on this. Thanks!

#3

If you have multiple triggers (orange lightning bolts) in a single piston then chances are you’d semaphore messages. Post a sample green snapshot of a piston.

#4

Loops and While Loops are also culprits…

Monitoring power changes can also spam your home network.

#5

So are semaphores specific to webcore or is that something that shows up in Live Logging in the ST page?

I only have a couple of Loops and While Loops and I unplugged my smart outlets because I noticed they were blasting my home network with so many updates (is there anything I can do about that?). If a ‘while loop’ is running and another piston tries to execute - is it going to always cause a semaphore?

Is there a way to start identifying the root cause of the semaphore; I would really like to clean things up and get them working more smoothly.