10 replies to abbot binary optionsn
What I can tell is that the length of the record is not only not a multiple of eight the bytes in hexdump are grouped by eight but it is odd , which, by itself, is fairly odd pun intended.
This can be told by noticing how the colouring crosses the mid-row spacing, for 0c 80 , for reading values and timestamps alike. Even more interesting, not only the records can cross the message boundaries see record 0x8fe0 for which the 0xb value is the next message over , but even do the fields. Indeed you can see on the third message the timestamp ends abruptly at the end of the message. Since the device uses little-endian to encode the numbers, the higher bytes are at the end of the encoded sequence, which means 4B B5 DE needs to terminate with 05 , just like CC B8 DE 05 before it.
But the next time we encounter 05 is in position nine of the following message, what gives? The first two bytes of the message, if you checked the protocol description linked earlier, describe the message type 0B and the number of significant bytes following out of the usb packet , in this case 3E means the whole rest of the packet is significant. Following that there are six bytes highlighted turquoise in the image , and here is where things get to be a bit more confusing. You can actually see how discarding those six bytes from each message now gives us a stream of records that are at least fixed length except the last one that is truncated, which means the commands are requesting continuous sequences, rather than blocks of records.
Those six bytes now become interesting, together with the inbound command. The command that was sent just before receiving this response was 0D 04 A5 13 00 Once again the first two bytes are only partially relevant message type 0D , followed by four significant bytes. But A5 13 is interesting, since the first message of the reply starts with 13 A6 , and the next three message increment the second byte each.
Indeed, the software follows these with 0D 04 A9 13 00 00 , which matches the 13 A9 at the start of the last response message. What the other four bytes mean is still quite the mystery.
My assumption right now is that they are some form of checksum. The reason is to be found in a different set of messages:. In this set of replies, there are two significant differences compared to the ones with record earlier. The first is that while the command lists 5F 13 the replies start with 10 5F , so that not only 13 becomes 10 , but 5F is not incremented until the next message, making it unlikely for the two bytes to form a single bit word.
The second is that there are at least four messages with identical payload fifty-six bytes of value zero. And despite the fourth byte of the message changing progressively, the following four bytes are staying the same. By the way, the data in the last message relates to the list of sensors the devices has seen — 9ep. Going back to the epoch, which is essentially the last thing I can talk about for now.
The numbers above clearly shower in a different range than the UNIX timestamp, which would start with 56 rather than So I used the same method I used for the Verio, and used a fixed, known point in time, got the timestamp from the device and compared with its UNIX timestamp. The answer was — which is T It turns out that I practice sport often to keep my diabetes type 1 under control. It is not very handy when participating in a race that you have to stop or risk not to do so while testing blood glucose on a bike ride.
However, since the data read out from the Libre is not standardized anywhere, I was wondering if you actually ended up finding out the coding of the data from the Libre. Thanks a lot in advance! Good blog by the way! I have not even tried reversing the NFC protocol — somebody did but I have no intention to follow through myself.
The problem is that the calibration happens on the reader device rather than the sensor, so even if you can get the data out, it would not be reliable. For this kind of usage, a continuous 2. HiI finally have a device on my own and I was digging into the protocol a little. I found out that with the commands from insulinx https: Now if there is just a command which returns the rest as well and we are happy.
But this is already a step. Oh wow this is really nice information! Thank you very much! Hi good night dear. I am from Brazil and want help this project. I get a sensor and i am testing read sensor. Can you tell me how interpret raw data. I identificated some lines… but have much data that I dont know what is. Can you help me to make this? I want implement a bluetooth reader to this sensor. To dont need put smartphone in the arm to read sensor at night, and to generate alarms. I found some values freom freestyle a2 85 0d 59 9e a2 is a glucose meter.
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