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The Mares Sirius uses the same communication protocol as the Genius, except for the fact that it uses a newer BLE version which supports larger data packets. The actual MTU is likely negotiated because we see different sizes like 244 and 182 bytes. We don't have access to this MTU size because not all BLE implementations can expose this information. Unfortunately not only the BLE packet size is variable, but also the size of the higher level data frames (used for downloading the content of the objects) is no longer fixed. The frame size appears to adapt to the BLE MTU size. This is most likely done to reduce the overhead and maximize the throughput. Although each frame ends with an OxEA byte, we can't rely on this knowledge to detect the end of the frame. The END byte is not escaped in the payload, and thus can also appear anywhere in the frame. As a workaround, we rely on the fact that each frame appears to be send as a single BLE packet. The only exception is the ACK byte, which gets send as a separate BLE packet if the command requires parameter data. Compatible models: Quad Ci, Puck 4 and Puck Air 2
Overview ======== Libdivecomputer is a cross-platform and open source library for communication with dive computers from various manufacturers. The official web site is: http://www.libdivecomputer.org/ The sourceforge project page is: http://sourceforge.net/projects/libdivecomputer/ Installation ============ On UNIX-like systems (including Linux, Mac OS X, MinGW), use the autotools based build system. Run the following commands from the top directory (containing this file) to configure, build and install the library and utilities: $ ./configure $ make $ make install If you downloaded the libdivecomputer source code directly from the git source code repository, then you need to create the configure script as the first step: $ autoreconf --install To uninstall libdivecomputer again, run: $ make uninstall Support ======= Please send bug reports, feedback or questions to the mailing list: http://libdivecomputer.org/cgi-bin/mailman/listinfo/devel or contact me directly: jef@libdivecomputer.org License ======= Libdivecomputer is free software, released under the terms of the GNU Lesser General Public License (LGPL). You can find a copy of the license in the file COPYING.