This is my first contribution to the community .. i just implemented MQTT broker authentication via user and password i found little information about this device ... hope it is useful 

Great info and review about the higrow 
https://flashgamer.com/blog/comments/review-of-higrow-esp32-moisture-and-temperature-sensor



Upload sketch to higrow

install esp32 board : https://dl.espressif.com/dl/package_esp32_index.json
use esp32 dev module
Press and hold BOOT button on higrow and click UPLOAD in arduino IDE (keep Pressing until end).