Protocole errors in FBB forwarding system :

0 : Binary packet is not of header (HD) type when receiving title.
1 : Checsum of message is wrong.
2 : Message could not be uncompressed.
3 : Received binary frame is not DATA (DT), not EOT (ET).
4 : Checsum of proposals is wrong.
5 : Answer to proposals must start with "F" or "**".
6 : Answer to proposals must be either "FF" not "FS".
7 : More than 5 answers (with "+", "-" or "=") to proposals.
8 : Answer to proposal is not "+", "-" or "=".
9 : The number of answers does not match the number of proposals.
10: More than 5 proposals have been received.
11: The number of fields in a proposal is wrong (6 fields).
12: Protocole command must be "FA", "FB", "F>", "FF" or "FQ".
13: Protocole line starting with a letter which is not "F" or "*".