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Thanks for the shout-out! I’m the lead developer of Fennel.
I’ve used it for some hardware hacks using an ESP8266 to run an IRC bot based on nodeMCU: https://git.sr.ht/~technomancy/pengbot/tree/micropeng/ Some other folks have gotten it running on an ESP32 as well, which is an even better fit. Figure those might be interesting to other Adafruit blog readers.