Executive Summary
... just prefix all your house #IoT commands with "Simon Says"
And then listen out for them using node-red-contrib-alexa-remote2
Obviously, being called Simon doesn't make this method sound daft to me
History
I tried a few Alexa nodes out and settled on using @hardillb excellent node-red-contrib-alexa-home-skill and that has worked very well for me.
Only issue is that you have to pretend your home stuff is lights or a switch etc and limited vocab is recognised.
Also, needs an account on Ben's site and "maybe" he is getting all my Alexa commands??? but I'm not worried about Ben - its Mr Amazon that's my main privacy issue
But, sometimes you need to recognise your own custom sentences. @E1cid recommended node-red-contrib-alexa-remote2 coupled with using Amazon Q&A blueprint skill. That expands what syntax you can use but also requires keeping your Node-RED stuff in sync with the Q&A skill. And it is still restrictive (You can't set Q&A skill to recognise and pass on "tv" for instance)
How I found it out
Following a discussion with @ghyane I serendipitously used the phrase "Alexa Simon Says gobblydgook" and noticed that it came straight thru to Node-RED without Alexa trying to tell me off and saying "I don't know what to do with that"
If you fancy trying this out then setup alexa-remote2 node and try out my basic flow here that gets the phrase that you say plus the device that said it and filters out any un-needed other messages.
[{"id":"c09690b2.1a8fd","type":"debug","z":"925ad8ab.4246f8","name":"FILTERED","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":750,"y":20,"wires":[]},{"id":"afa5bf44.be6ab","type":"change","z":"925ad8ab.4246f8","name":"extract summary","rules":[{"t":"set","p":"name","pt":"msg","to":"payload.name","tot":"msg"},{"t":"set","p":"summary","pt":"msg","to":"payload.description.summary","tot":"msg"},{"t":"set","p":"payload","pt":"msg","to":"summary","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":760,"y":72,"wires":[["c681a553.9ef878","fa3edab0.ee1aa8"]]},{"id":"c681a553.9ef878","type":"debug","z":"925ad8ab.4246f8","name":"SUMMARY","active":true,"tosidebar":true,"console":false,"tostatus":true,"complete":"true","targetType":"full","x":958,"y":72,"wires":[]},{"id":"64cb021c.798e4c","type":"debug","z":"925ad8ab.4246f8","name":"ALL","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","x":262,"y":98,"wires":[]},{"id":"fa3edab0.ee1aa8","type":"debug","z":"925ad8ab.4246f8","name":"","active":true,"tosidebar":false,"console":false,"tostatus":true,"complete":"payload","targetType":"msg","x":750,"y":124,"wires":[]},{"id":"19b6770f.6e0b49","type":"switch","z":"925ad8ab.4246f8","name":"Only pass SUCCESS messages","property":"payload.activityStatus","propertyType":"msg","rules":[{"t":"eq","v":"SUCCESS","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":342,"y":46,"wires":[["322641a4.2b156e"]]},{"id":"322641a4.2b156e","type":"switch","z":"925ad8ab.4246f8","name":"Filter out noise","property":"payload.description.summary","propertyType":"msg","rules":[{"t":"eq","v":"","vt":"str"},{"t":"eq","v":"alexa","vt":"str"},{"t":"else"}],"checkall":"true","repair":false,"outputs":3,"x":578,"y":46,"wires":[[],[],["c09690b2.1a8fd","afa5bf44.be6ab"]]},{"id":"323d0c34.2821a4","type":"alexa-remote-event","z":"925ad8ab.4246f8","name":"","account":"","event":"ws-device-activity","x":94,"y":46,"wires":[["19b6770f.6e0b49","64cb021c.798e4c"]]}]
Downsides
You have to use the phrase "Simon Says" - not found any method of changing that - and Alexa repeats your phrase - which could be considered a benefit of course!
[edit]26May 2020
*If you want to Alexa to speak, you can use the Alexa Routine node for this - note that it also uses the "simon says" approach to make Alexa devices speak.
So If you ask Alexa to speak "all done" then it actually sends Alexa the phrase "simon says all done".
So you have to make sure that these phrases are not one of your key phrases as you could easily end up in a howl around situation!*
[/edit]
PS I'd be grateful to keep discussion on this thread to this method - no problem to post - also see xxxxx - but lets not get into a discussion about xxxx please
But entirely up to anyone
PPS @ghayne You are now released from your NDA