To use #BASE64 in command mode, if data to send exceed
maximum value for #SSENDEXT command, they must be divided in
multiple parts. These parts must be a multiple of 57 bytes, except
for the last one, to distinguish EOF condition (Base64 encoding
rules). For the same reason if #SRECV command is used by the
application to receive data, a multiple of 78 bytes must be
considered.
To use #SRECV to receive data with <dec> enabled, it is necessary
to consider that: reading <maxByte> bytes from socket, user will
get less due to decoding that is performed.