# Unproto message lists.

(Appendix 18)

     FBB software allows sending unproto lists of message. This is validated
    separately on each port (letter L in PORT.SYS). Unproto address is FBB with
    the following header :

    fm F6FBB-1 to FBB ctl UI

     An unproto list line is sent on every validated port each time a message is
    recorded. The line is in the form :

    12345 B 2053 TEST@ALL F6FBB 920325 This is the subject

     If a message number is missing or does not exist the line will be :

    12346 #

     This allows a system listening to the UI packets on a frequency to create a
    list identical to the one of the BBS, and then the user will not have to
    connect the BBS to know the list of messages and bulletins.

     A control can be done on the number of the messages to check if a line is
    missing.

     If the remote system receives a new line, and a line is missing, it only has
    to send an unproto frame addressed to the BBS callsign like this :

    fm FC1EBN-3 to F6FBB-1 ctl UI
    ? 00002EE00E

     This will be taken in account only if the user has the U flag validated (EU
    command).

     If the user has not his flag validated in the BBS, he will receive a line
    like :

    fm F6FBB-1 to FBB ctl UI
    12200 / callsign

     In this case, the the remote software MUST stop asking unprotoes.

     The first 8 digits are the hexadecimal number of the requested start of the
    list (here 00002EE0 -> 12000) and the last two digits are the sum of the four
    bytes anded with FF (0E).

     The BBS will then starts sending lines from the requested number up to the
    last message number.

     If the number requested seems to be too far from the current line, the BBS
    can readjust the request of "callsign" while sending :

    fm F6FBB-1 to FBB ctl UI
    12200 ! CALLSIGN
    12201 B 2040    TEST@FRA    F6FBB  920325 This is a bulletin
    12202 #
    12203 P 206    F6ABJ@F6ABJ  F6FBB  920325 Hello Remy.
    etc...

    and then starts sending lines from 12201. The remote system must change its
    base number to 12201.

      If the number requested is greater than the last message received in the
    BBS, the BBS will send a line like :

     12300 !!

     This indicates that the list in the remote system is up to date. The last
    received message in the BBS is 12300.

     The remote system can also connect the BBS and ask for messages in binary
    compressed mode using the following sequence :

         BBS                                    Remote system
    --------------------------------------------------------------------------
                                                Connection request
    Connection.

    [FBB-5.14-ABFHM$]
    Welcome in Toulouse, Gerard.
    F6FBB BBS>
                                                [TPK-1.80-$]
    1>
                                                F< #Msg
    Binary compressed message #Msg
    is sent using format described
    in appendix 7
    1>
                                                Disconnect.

     From TPK version 1.80 (packet communication program developed by FC1EBN),
    this protocol is implemented.

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