One thing I found is https://sequematic.com. Source: over 2 years ago

Then I use another app (macrodroid) to "listen" for this specific notification, when it comes in it resets&restarts a stopwatch, and I have another trigger for that stopwatch being at 1 min 30sec which calls a (sequematic.com) webhook to turns my light off.. Source: over 2 years ago

I use sequematic.com now to control my RGB bulbs via webhook, it lets me set them to a specific colour using json. For example; {"h":0,"s":255,"v":255} this sets my bulbs to red, and {"h":240,"s":255,"v":255} sets them to blue. Took me some time to figure this all out and set it up but it works, unlike tuya/smartlife.. :P. Source: over 2 years ago

I don't use IFTTT myself (i use sequematic.com to control my tuya devices via webhooks) so I don't know if it could also be done with just IFTTT.. Source: over 2 years ago

I would suggest looking into sequematic.com. Source: over 2 years ago

Esp32.net has a bunch of additional references, projects, and places to gather information. Source: almost 3 years ago

Closest thing is the ESP32 from Espressif Systems See ESP32 link for details. Since you specifically asked for open source, so some tinkering and compile is required. Source: about 3 years ago

There's also many more dev boards, chips and modules listed here, though they may not necessarily have platformio IDs. Source: about 3 years ago