LE910Cx Linux:
In <mode> = 0
After command line terminated with <CR>, We see the
intermediate result code CONNECT.
After this prompt, the file type must be in binary format.
If data successfully sent, then the response is OK.
If data sending fails for some reason, an error code reported.
In <mode> = 1
Command returns the current <size> of the <category> file.
#ACDB: <size>