Here's a couple of hours out of my Sunday.
Wednesday, April 30, 2014
Evaluating the Rfduino
Here's a couple of hours out of my Sunday.
Thursday, April 24, 2014
Matching up Meter Records to Packet Sniffer
Finally matched up some of the packet data to a sensor record on the Dexcom. Assuming this is the raw counts from the sensor. Probably should be using all 4 bytes here, not just 3.
88 mg/dl
BD 52 FD 09 54 1B FD 09 C0 93 01 00 70 84 01 00 C8 00 05 93 :From sensor data record
3C 99 E2 1E :From packet sniffer
00111100100110 01111000100001 1110 :Convert packet to binary
00111100100110 Reverse->01100100111100 ->193C :Reverse the first 14 bits
And back to Hex
96 mg/dl
15 55 FD 09 AC 1D FD 09 90 99 01 00 70 9C 01 00 C5 00 C2 38 :From sensor data record
packet 99 99 E3 9E :From packet sniffer
10011001100110 01111000111001 1110 :Convert packet to binary
10011001100110 Reverse->01100110011001=1999
95 mg/dl
41 56 FD 09 D8 1E FD 09 20 9C 01 00 00 9B 01 00 C3 00 29 04 :From sensor data record
packet 43 99 0D 9E :From packet sniffer
01000011100110 01000011011001 1110 :Convert packet to binary
01000011100110 Reverse->01100111000010 =19C2
95 mg/dl
99 58 FD 09 30 21 FD 09 30 A3 01 00 C0 9A 01 00 BA 00 EE 50 :From sensor data record
packet CC 59 35 9E :95 :From packet sniffer
11001100010110 01001101011001 1110 :Convert packet to binary
11001100010110 Reverse->01101000110011 = 1A33
120 mg/dl
F9 61 FD 09 90 2A FD 09 80 E2 01 00 E0 D1 01 00 BA 00 DB D0 :From sensor data record
Packet 14 79 78 BE D8 :From packet sniffer
00010100011110 01011110001011 1110 :Convert packet to binary
00010100011110 Reverse-> 01111000101000 =1E28
The sensor data records look like this:
--date------------ --date------------ ----counts--------- --second set ?---
FD 3F FD 09 94 08 FD 09 20 90 02 00 00 96 02 00 C0 00 14 00
29 41 FD 09 C0 09 FD 09 C0 85 02 00 80 8D 02 00 C0 00 8D 43
55 42 FD 09 EC 0A FD 09 60 7F 02 00 E0 88 02 00 B7 00 31 00
81 43 FD 09 18 0C FD 09 00 7B 02 00 20 84 02 00 AD 00 67 55
AD 44 FD 09 44 0D FD 09 00 67 02 00 A0 7C 02 00 C4 00 3C D3
D9 45 FD 09 70 0E FD 09 A0 45 02 00 40 6F 02 00 CA 00 E3 58
05 47 FD 09 9C 0F FD 09 60 26 02 00 80 59 02 00 B2 00 D7 99
31 48 FD 09 C8 10 FD 09 60 FE 01 00 80 3A 02 00 B4 00 52 53
5D 49 FD 09 F4 11 FD 09 90 C1 01 00 80 12 02 00 B6 01 94 6F
BD 52 FD 09 54 1B FD 09 C0 93 01 00 70 84 01 00 C8 00 05 93
15 55 FD 09 AC 1D FD 09 90 99 01 00 70 9C 01 00 C5 00 C2 38
41 56 FD 09 D8 1E FD 09 20 9C 01 00 00 9B 01 00 C3 00 29 04
99 58 FD 09 30 21 FD 09 30 A3 01 00 C0 9A 01 00 BA 00 EE 50
Tuesday, April 22, 2014
There is a Pattern
Houston we have a pattern
AF 89 AA 4E : 76 1010111110001 001 1010101001001 110
28 49 55 4E : 77 0010100001001 001 0101010101001 110
A9 49 DE CE : 80 1010100101001 001 1101111011001 110
8D 49 AF 4E : 81 1000110101001 001 1010111101001 110
E3 49 BC 4E : 82 1110001101001 001 1011110001001 110
10 C9 37 CE : 83 0001000011001 001 0011011111001 110
CE C9 E2 2E : 86 1100111011001 001 1110001000101 110
67 29 4E 6E : 97 0110011100101 001 0100111001101 110
9B A9 66 EE :103 1001101110101 001 0110011011101 110
C3 A9 AD 6E :103 1100001110101 001 1010110101101 110
28 69 AF AE :105 0010100001101 001 1010111110101 110
5A 69 0D 6E :107 0101101001101 001 0000110101101 110
9B 69 F8 1E :110 1001101101101 001 1111100000011 110
7B 69 74 6E :110 0111101101101 001 0111010001101 110
69 E9 A9 1E :115 0110100111101 001 1010100100011 110
93 99 E7 EE :117 1001001110011 001 1110011111101 110
F9 19 97 1E :122 1111100100011 001 1001011100011 110
FF D9 1E 5E :135 1111111111011 001 0001111001011 110
C0 39 BD 3E :151 1100000000111 001 1011110100111 110
B3 B9 EE 7E :163 1011001110111 001 1110111001111 110
F6 B9 0E 7E :163 1111011010111 001 0000111001111 110
Pulling out the BOLD portion, flipping it around:
1111011010111 reverse bits->1110101101111 7535 :163
1001101110101 reverse bits->1010111011001 5593 :103
1100001110101 reverse bits->1010111000011 5571 :103
1010111110001 little endian->1000111110101 4597 :76
The other stuff should be background...
I'll reformat this tonight when I have access to a real browser.
Thursday, April 3, 2014
Time to go Rainman on this
Here's a range of data from the packet sniffer.
Does anyone see a pattern here, I don't.
Err indicates a checksum error, don't worry about it. I reordered the data by glucose level so you can see how identical readings can look pretty different.
2 day old sensor
Does anyone see a pattern here, I don't.
Err indicates a checksum error, don't worry about it. I reordered the data by glucose level so you can see how identical readings can look pretty different.
2 day old sensor
txn
--xmtr id-- id crc mg/dl
____________________________________________________________
FF FF FF FF CA 58 61 00 3F 03 40 AF 89 AA 4E D8 00 37 : 76
FF FF FF FF CA 58 61 00 3F 03 3C 28 49 55 4E D8 00 1C : 77
FF FF FF FF CA 58 61 00 3F 03 EF A9 49 DE CE D8 00 F5 : 80
FF FF FF FF CA 58 61 00 3F 03 F3 8D 49 AF 4E D8 00 16 : 81
FF FF FF FF CA 58 61 00 3F 03 44 E3 49 BC 4E D8 00 0D : 82
FF FF FF FF CA 58 61 00 3F 03 EB 10 C9 37 CE D8 00 01 : 83
FF FF FF FF CA 58 61 00 3F 03 E7 CE C9 E2 2E D8 00 10 : 86
FF FF FF FF CA 58 61 00 3F 03 F7 19 C1 CD 4E D8 00 67 : 87 err
FF FF FF FF CA 58 61 00 3F 03 FB 95 C9 FB 4E D8 00 1A : 88
FF FF FF FF 0A 58 61 00 3F 03 DF A6 29 9E AE D8 00 E9 : 93 err
FF FF F7 FF CA 58 61 00 3F 03 DB 67 29 4E 6E D8 00 86 : 97
FF FF FF FF CA 58 61 00 3F 03 FF 84 A9 9E CE D8 00 FC : 98
FF FF FF FF CA 58 61 00 3F 03 20 15 A9 90 6E D8 00 D7 :102
FF FF FD FF CA 58 61 00 3F 03 50 CA 99 4D AE D8 00 02 :102 err
FF FF FF FF CA 58 61 00 3F 03 D7 9B A9 66 EE D8 00 2A :103
FF FF FF BF CA 58 61 00 3F 03 14 C3 A9 AD 6E D8 00 0A :103
FF FF FF FF CA 58 61 00 3F 03 24 28 69 AF AE D8 00 80 :105
FF FF FF FF CA 58 61 00 3F 03 10 5A 69 0D 6E D8 00 1B :107
FF FF FF FF CA 58 61 00 3F 03 08 F1 69 8A AE D8 00 6D :108
FF FF FF FF CA 58 61 00 3F 03 D3 9B 69 F8 1E D8 00 65 :110
FF FF FF FF CA 58 61 00 3F 03 0C 7B 69 74 6E D8 00 25 :110
FF FF FF FF CA 58 61 00 3F 03 CF 69 E9 A9 1E D8 00 CE :115
FF FF FF FF CA 58 61 00 3F 03 54 93 99 E7 EE D8 00 E4 :117
FF FF BF FF C2 58 61 00 39 03 94 7A 19 9F 9E D8 00 02 :121 err
FF FF FF FF CA 58 61 00 3F 03 CB F9 19 97 1E D8 00 72 :122
FF FF FF FF CA 58 61 00 3F 03 58 DB 99 31 9E C8 80 56 :129 err
FF F8 E7 FF CA 58 61 00 3F 23 90 E5 99 17 4E D8 00 B2 :130 err
FF FF FF FF CA 58 61 00 3F 03 5C 04 59 12 5E D8 00 A0 :134
FF FF FF FF CA 58 61 00 BF 03 60 95 5B BA 1E D8 00 4B :135 err
FF FF FF FF CA 58 61 00 3F 03 64 FF D9 1E 5E D8 00 24 :135
FF FF FF FF CA 58 61 00 3F 03 6C 01 79 06 3E D8 00 74 :149 err
FF FF FF FF CA 58 61 00 3F 03 84 C0 39 BD 3E D8 00 62 :151
FF FF FF FF CA 58 61 00 3F 03 80 23 39 3C BE D8 00 E9 :155
FF FF FF FF CA 58 61 00 3F 03 70 9C 79 4D BE D8 00 79 :158
FF FF FF FF CA 58 61 00 3F 03 7C 50 B9 07 BE D8 00 09 :159
FF FF FF FF CA 58 61 00 3F 03 74 B3 B9 EE 7E D8 00 53 :163
FF FF FF FF CA 58 61 00 3F 03 78 F6 B9 0E 7E D8 00 9F :163
Lets agree that we're interested in the 4 bytes after the transaction id. Note how the second bit of the second byte always is a "9", and how bit 2 of byte 4 is always an "E".
I expected that 2 bytes would be a raw value, and 2 bytes would be a background. I'm not seeing that here.
--Cleaned up Just look at the important stuff
AF 89 AA 4E : 76
28 49 55 4E : 77
A9 49 DE CE : 80
8D 49 AF 4E : 81
E3 49 BC 4E : 82
10 C9 37 CE : 83
CE C9 E2 2E : 86
19 C1 CD 4E : 87 err
95 C9 FB 4E : 88
A6 29 9E AE : 93 err
67 29 4E 6E : 97
84 A9 9E CE : 98
15 A9 90 6E :102
CA 99 4D AE :102 err
9B A9 66 EE :103
C3 A9 AD 6E :103
28 69 AF AE :105
5A 69 0D 6E :107
F1 69 8A AE :108
9B 69 F8 1E :110
7B 69 74 6E :110
69 E9 A9 1E :115
93 99 E7 EE :117
7A 19 9F 9E :121 err
F9 19 97 1E :122
DB 99 31 9E :129 err
E5 99 17 4E :130 err
04 59 12 5E :134
95 5B BA 1E :135 err
FF D9 1E 5E :135
01 79 06 3E :149 err
C0 39 BD 3E :151
23 39 3C BE :155
9C 79 4D BE :158
50 B9 07 BE :159
B3 B9 EE 7E :163
F6 B9 0E 7E :163
Some other information from a Dex 7 log, just to give an idea on ranges. Also, note the hex doesn't match the calculated value... Highest possible value of 0xFFFF = 65535
RawCountsX="0x9C34" RawCounts="115520" FilteredCountsX="0x7BEB" FilteredCounts="57176" GlucoseValue="162" RawEstimatedGlucoseValue="-3934" RawCountsX="0x9BEA" RawCounts="114336" FilteredCountsX="0x7C44" FilteredCounts="57888" GlucoseValue="159" RawEstimatedGlucoseValue="-3937" RawCountsX="0x9BE5" RawCounts="114256" FilteredCountsX="0x7C02" FilteredCounts="57360" GlucoseValue="159" RawEstimatedGlucoseValue="-3937" RawCountsX="0x99BA" RawCounts="105376" FilteredCountsX="0x7A1B" FilteredCounts="53464" GlucoseValue="159" RawEstimatedGlucoseValue="28831" RawCountsX="0x9784" RawCounts="96320" FilteredCountsX="0x78D9" FilteredCounts="50888" GlucoseValue="122" RawEstimatedGlucoseValue="-3974" RawCountsX="0x95E2" RawCounts="89632" FilteredCountsX="0x7639" FilteredCounts="45512" GlucoseValue="117" RawEstimatedGlucoseValue="-3979" RawCountsX="0x937B" RawCounts="79792" FilteredCountsX="0x7445" FilteredCounts="41512" GlucoseValue="85" RawEstimatedGlucoseValue="-4011" CalibrationSlope="297.628370890284" CalibrationIntercept="53434.3524196528"
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