Raised this idea on Tasmota project.
It appears the chances of that happening are not too good, unfortunately. Viz:
Https is unlikely to be supported on Esp8266 due to the limited capacities of the processor
http can already be performed with Websend command.
Have you tried it?
Another user commented:
Since MQTT support seems to exist for EmonCMS, this would be the better method for connecting.
TBH I agree. I send my data to NR to process and set the timestamp in the right format before sending on to EmonCMS both via MQTT. I could do this by using Tasmota rules probably rather than NR.
It also means I can pick up the data as ‘sensor’ data in HA direct from Tasmota.