The FTP code called prot_p() (protected data channel) for all printers,
but for A1/A1 Mini it didn't wrap the data connection in SSL. This
mismatch caused an immediate EOFError - server expected encrypted data
but received plain data.
Fix:
- Use prot_c() (clear/unencrypted data channel) for A1/A1 Mini
- Use prot_p() (protected/encrypted data channel) for X1C/P1S/etc
- Removed non-functional ftplib._SSLSocket = None workaround
A1/A1 Mini: control channel encrypted (implicit TLS), data channel clear
X1C/P1S/etc: both channels encrypted with SSL session reuse
Closes#271
maziggy
379ba726e1