I added https://nutcracker.pine64.org/arduino/package_bouffalo_index.json (Also tried index.json directly from github). But, the Arduino IDE throws me : Some indexes could not be updated. Get "https://nutcracker.pine64.org/arduino/package_bouffalo_index.json": remote error: tls: internal error: https://nutcracker.pine64.org/arduino/package_bouffalo_index.json 