Enchancement: Bridge notifications only locally

[tomanwalker]

Would it be possible to introduce a configuration that would publish bridge state only locally (0 | 1). A remote broker does not allow retained messages to be published. However the notifications can be used on a device. E.g. I was thinking to make Raspberry Pi senseHAT App that would monitor the notification and then make it into LED light ( green | red ) based on state.

[ralight]

Expanding bridge notifications like you've said seems like a reasonable plan. Needs a little bit of thought as to how it will work with the existing settings.

[cjmaynard]

I think there might be a problem here. Yesterday I tried Ben's patch and set notifications_local_only true. If I have a local client subscribed to $SYS/broker/connection/+/state and I shut down the remote broker such that the bridge is no longer connected, my local client does not get the notification update that the state is now '0'. When the remote broker is restarted and the bridge is reestablished, the local client does get the notification update that the state is now '1' though. (If I don't use notifications_local_only true, the client does get both '0' and '1' state changes, as expected ... but of course then the state topic is published across the bridge, which I want to avoid.)

[karlp]

I added a comment to 740b710 as well. I can confirm that I don't get the 0 state when the bridge connection is lost, only the 1 when it's established. using mosquitto devel branch