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 [email protected] 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 [email protected] F6FBB 920325 This is a bulletin 12202 # 12203 P 206 [email protected] 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.