There is a new beta plugin (httpcaller) under the user interface heading of the plugin store.
A little background first…
My HiFi has many esp32 micro-controllers to carry out various tasks, control the motorised alps pot for the volume, power on/off the hdmi monitor etc.
The main esp has its own (very simple) web page but it is slow to load and with Safari it now takes a couple of clicks to wake up before considering doing anything. As such, what started off as a useful aid has been long forgotten, the remote control taking the leading role.
Now with the httpcaller plugin I can do all I want to do from within Volumio and much quicker than through the esp web page.
I’m not advocating using Volumio to open your garage door or turn on your central heating but - if you are in a similar situation to me, who knows, you might be the one other person that finds this plugin useful!
I have been using it for some time now. It does all I want it to. I have not tried calling anything other than my HiFi and Volumio hasn’t faltered yet. If you use it and it works, let me know.