1 500 - Command not found
2 501 - Wrong number of arguments
3 502 - Unauthorized request
4 503 - Already logged in
5 504 - Could not convert to character set
7 506 - Authentication error
8 507 - Command not expected
9 508 - No such authentication mechanism
10 509 - Malformed argument
11 510 - No such fnetnode
13 512 - No such transfer
14 513 - Not supported for this fnet
17 516 - Duplicate recipient
18 517 - No such recipient
19 518 - Recipient not listening
26 605 - FN num peers change
28 611 - Transfer state change
29 612 - Transfer nick change
30 613 - Transfer size change
31 614 - Transfer error update
32 615 - Transfer progress
33 616 - Transfer path change
34 617 - Transfer destroy
35 618 - Transfer hash update
36 620 - Search ETA change
42 640 - Client-to-client message