Add ABB-Welcome / Busch-Welcome Door Intercom Protocol

[Mat931]

Description:

Related issue (if applicable): fixes

Pull request in esphome with YAML changes (if applicable): esphome/esphome#4689

Checklist:

• [x] I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
  or

• [ ] I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.

• [ ] Link added in /index.rst when creating new documents for new components or cookbook.

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[nagyrobi]

Which modules from ABB use this? I've looked at their site but only found video-over IP stuff...

[Mat931]

@nagyrobi Look in the category "ABB-Welcome" (the one without IP) here or "Busch-Welcome" here Example Model Number: 83222 U-625

They are quite common in Europe. More info: https://developer.nuki.io/t/abb-or-busch-welcome-series/3026

[nagyrobi]

How do these (non-IP) transmit audio/video to each other? Also RF? Scrolled through the manual, only need a wire pair for power?

[Mat931]

No, there's no RF. Everything is sent over the two wires. Not sure about the audio but the video signal is analog. They are using an ADV7180 for decoding. As you can imagine, the video quality is not the best and they only let you save 480x360 jpegs, no videos. Can't recommend haha

[nagyrobi]

No, there's no RF.

What is this component for, if that's the case?

[Mat931]

@nagyrobi For sending and receiving messages on that two wire bus. You need a custom circuit: https://github.com/esphome/esphome/pull/4689 Where would be the best place in the docs to put information like this?

[nagyrobi]

Oops... That needs a very clear note in the doc. I suggest to definitely state in the description that the signal is intended to be transmitted or received over copper wires, with an adaptor circuit referred at the end of the page. You should make a note box at the bottom, describing the circuit and noting what devices it is compatible with.

[nagyrobi]

Do you have any info about how's audio transmitted over the wires? Since we're starting to support mic/line input on ESPHome, this could be a nice extension to a future smart intercom through HA...

[Mat931]

No, sorry. I would need to do some more reverse engineering of the PCB and it would certainly require extra hardware. Is there any support in HA besides giving my delivery guy access to my voice assistant? AFAIK the audio does not pass through the CPU of the indoor station. There are some audio ICs but I don't remember the details.

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