[mh] Adding Tasmota HTTP support

As a follow-on to the "What’s better than Insteon?" thread, Giles put me 
onto the Tasmota open source firmware that will run on a huge number 
(literally thousands) of smart things on the market. While you can talk 
to those over MQTT, then you also need to setup a broker, and that seems 
awkward in a world where all the smart things have web interfaces.

So that got me thinking about building a "Tasmota_HTTP_Item" in MH.  
There is already support for SETting things in MH using HTTP via the 
lib/http_server.pl code.  Tasmota devices can send updates using HTTP, 
as in this example:

https://tasmota.github.io/docs/Rules/#two-way-light-switches-without-mqtt

So combining those two would result in a rule for local switch control 
on the Tasmota with a command like:

WebSend [<mh_ip_address>:8081] 
/SET;none?select_item=Tasmota_Item_Name&select_state=on

And for remote control, MH would send a command like this when an item 
is set:

get 'http://<tasmota_item_ip>/cm?cmnd=POWER1 ON'

The only other thing is that the "set" function for the Tasmota_Item 
would need to check if the item was set_by:

web [<tasmota_item_ip_address>]

...and then not send anything in that case so it doesn't end up in a 
send loop with the Tasmota device.

Anyone tried anything like that?  If not, I guess it is time to order 
some of these things and start tinkering!



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