Documentation for v2.2.1.0 is available at https://docs.espressif.com/projects/esp-at/en/release-v2.2.0.0_esp8266/
You can download the firmwares to use them, which support OTA from espressif‘s server.
ESP-AT v2.2.1.0 is a minor update for ESP-AT v2.2.0.0.
ChangelogThis is the list of changes since release v2.2.0.0:
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