Jsontomqtt.py reads the json output to add in max/min/trends and then publishes additional topics to mqtt.
Requires WeewxtoJson - https://github.com/teeks99/weewx-json
Edit /etc/weewx/skins/JSON $ sudo nano weewx.json.tmpl to add new tags (trend data is part of the default output)
#if $trend.barometer.has_data
"baro trend": {"value": $trend.barometer.raw, "units": "$trend.barometer.format(" ").lstrip()"},
#end if
#if $trend.outTemp.has_data
"temp trend": {"value": $trend.outTemp.raw, "units": "$trend.outTemp.format(" ").lstrip()"},
#end if
html includes standard and eink versions - these are general templates and need to be edited to your own mqtt feeds. If you just want the mqtt feeds then ignore the html pages.