IDE 2.1 - filenames have to be shorter than 63 characters

[pelabs]

Filenames used to be auto-truncated, and/or simply able to be longer than 63 characters.

I was used to typing something useful for ongoing large development projects, with the likes of:

Thanks.

[J-M-L]

@pelabs

Filenames used to be auto-truncated, and/or simply able to be longer than 63 characters

not according to the specification

Sketch folders and files¶

The sketch root folder name and code file names must start with a basic letter (A-Z or a-z) or number (0-9), followed by basic letters, numbers, underscores (_), dots (.) and dashes (-). The maximum length is 63 characters.

Support for names starting with a number was added in Arduino IDE 1.8.4.