About Cactus Micro R2 recently

The default firmware for esp8266 is espduino not AT firmware. The espduino firmware is easier to use for REST http request. Some examples available here.

If you’d like use previous AT firmware, you can re-flash the firmware yourself.

I wasn’t using AT, I followed the Tuan PM guides. The buad rate for Serial1 was different, but I figured it out - 115200. However, I’m getting “ets Jan 8 2013,rst cause:1, boot mode:(3,7)” and no further functionality from the ESP8266.

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Did you upload the espduino firmware yourself? Please try to upload the sketch rest.ino from example page.