How to avoid GPIO transmission on restart?

General
1

Hey gang,

I have a NR flow set to monitor (and email) a couple GPIO pins (power outage, etc) which are displayed on a Dashboard as red/green 'LEDs'. The problem is that when I restart the Pi, the value of those pins is re-read (to populate the dashboard LEDs, which are otherwise black for NULL input) which results in a notification being sent. i.e. "Outage: Mains power has been restored".

I just switched to the PiGPIOd library+node hoping that might have some options to deal with this, but it doesn't.

Anyone have any ideas on how to solve this?

All the best,
Dax.

2

The RBE node has an option to not pass on the first message seen, which might do what you want.

3

Ahh, so that would be put after the "LED" parry of the flow, but before the notification part.

Hmm, let me try that out.

Thanks, Colin!

4

Put it on the output of the gpio node

5

If I do that, the dashboard LEDs will be black, indicating null value. The show needs to check the state of those inputs.

6

I meant the wire from the GPIO node to your notification nodes, assuming that is how you have wired it.

7

Hey @Colin, yep we're on the same page. The problem is that if I block the first signal from the GPIO node, then the dashboard 'LED' is never given a state, so it shows a black circle for null.

What I guess I need is a way to block the first message only if it is a 1. That way I could detect a situation where, say, the mains power supply went out during a reboot of the pi. That's the only edge case I can think of.

8

Feed the LED through one wire direct from the gpio node and separately connect a wire from the gpio to the rbe and on to the notification flow.

9

Looks like Max Supergiovane's 'Boolean Logic Ultimate' package might hold the key to this, as they are "restart persistant".

10

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