diff --git a/M17_spec.tex b/M17_spec.tex index c6f1418..3d7a01c 100644 --- a/M17_spec.tex +++ b/M17_spec.tex @@ -102,18 +102,18 @@ draw=black] \renewcommand{\vhversionname}{Rev} \renewcommand \vhAuthorColWidth{.3\hsize} \renewcommand \vhChangeColWidth{1.7\hsize} - \vhEntry{1.0.0}{08 Dec 2019}{SP5WWP|N6MTS}{Formal specification repository created.} + \vhEntry{1.0.0}{08 Dec 2019}{SP5WWP|KR6ZY}{Formal specification repository created.} \vhEntry{1.1.0}{25 Jan 2021}{KC1AWV}{Initial \LaTeX conversion from Sphinx.} - \vhEntry{1.2.0}{09 Sep 2024}{N7TAE|SP5WWP}{Removed Definitions and Control Packets sections, rewrote Callsign Encoding appendix using examples in C.} + \vhEntry{1.2.0}{09 Sep 2024}{N7TAE|SP5WWP}{Removed Definitions and Control Packets sections.{\newline}Rewrote Callsign Encoding appendix using examples in C.} \vhEntry{1.3.0}{17 Oct 2024}{N7TAE|SP5WWP}{Introduced new LSD data type to clarify and correct discussion around LICH, and LSF.} \vhEntry{1.4.0}{01 Jan 2025}{SP5WWP}{Removed the KISS appendix and created a separate KISS specification document.} - \vhEntry{1.5.0}{11 Feb 2025}{N7TAE|VK7XT}{Rearranged the Data Link and Application Layer chapters for better flow, removed IP Network chapter and File Type appendix, added more details to Packet Mode, 3 new IP packets defined, and added new clarifying bit tables.} + \vhEntry{1.5.0}{11 Feb 2025}{N7TAE|VK7XT}{Rearranged the Data Link and Application Layer chapters for better flow, removed IP Network chapter and File Type appendix.{\newline}Added more details to Packet Mode.{\newline}3 new IP packets defined.{\newline}Added new clarifying bit tables.} \vhEntry{1.6.0}{08 Aug 2025}{SP5WWP}{Section 3.4 was moved to Part II.} \vhEntry{2.0.0}{12 Aug 2025}{N7TAE|N1ADJ|SP5WWP}{GNSS Meta data changed extensively. Values are now metric, and a new param related to HDOP was added.} \vhEntry{2.0.1}{23 Sep 2025}{K6OF}{Implement CCSDS A20.0-Y-4 style guide and clarify use of UTC.} \vhEntry{2.0.2}{28 Sep 2025}{K0RET}{Fixed misspellings.} \vhEntry{2.0.3}{09 Oct 2025}{SP5WWP}{Fixed Golay matrices display.} - \vhEntry{3.0.0-draft}{14 Oct 2025}{SP5WWP|IU2KWO|N1ADJ|N7TAE|LWVMOBILE}{Changed META text message padding (add more changes here).} + \vhEntry{3.0.0-draft}{16 Nov 2025}{SP5WWP|IU2KWO|N1ADJ|N7TAE|LWVMOBILE}{Redefined the TYPE field contents.{\newline}Changed META text message padding.{\newline}Changed how text data is sent using the META field.{\newline}Added TLE data packet type.} \end{versionhistory} \chapter{Licenses} @@ -1288,18 +1288,23 @@ The data type specifier can also be used as a protocol specifier. Table~\ref{tab \texttt{0x04} & IPv4 \\ \texttt{0x05} & SMS (null-terminated, UTF-8 encoded string) \\ \texttt{0x06} & Winlink \\ + \texttt{0x07} & TLE \\ \hline[2px] \end{tblr} \caption{Reserved Packet Protocol Identifiers} \label{tab:reserved_packet_protocols} \end{table} -The data type specifier is used to compute the CRC, along with the payload. Only format for SMS, \texttt{0x05}, has been specified. +The data type specifier is used to compute the CRC, along with the payload. Only format for SMS and TLE have been specified. \subsection{SMS} SMS is a way to send a null terminated UTF-8 text message quickly and efficiently. With a maximum of 33 data frames and 25 bytes per data frame, a 1-byte identifier, \texttt{0x05}, and a 2-byte CRC, the maximum number of characters in an SMS message sent via Packet Mode is $(33 \times 25) - 4$, or, $821$ bytes. The SMS message should not have any interspersed null bytes and should not contain any control characters expect for tab (\texttt{0x09}) and newline (\texttt{0x0A}). The CRC for the SMS type is inclusively calcuated from the identifier to the terminating null byte. +\subsection{TLE} + +TLE data packet starts with the \texttt{0x07} 1-byte payload identifier. Actual TLE data should follow as ASCII text strings (all 3 rows), separated by newline characters (\texttt{0x0A}). After the last character of the last row, a null character is added, followed by a 2-byte CRC. + \appendix \chapter{Address Encoding} \label{address_encoding}