Hi all! I'm using a USB ANT+ dongle with
https://github.com/half2me/antgo my Golang based ANT+ decoder.
I'm working with a Speed & Cadence Sensor
I've made it log all ANT+ data so I can better debug problems, and I have quite an interesting situation.
I use continous scanning mode:
Here is an excerpt of my log: (See the image, where I've marked the problematic packet)
[#][timestamp][type][Channel][ANT ID][Device Type] [...]
[CAD]: CadenceEventTime -> CumulativeCadenceRevolutionCount
[SPD]: SpeedEventTime -> CumulativeSpeedRevolutionCount
[ 1382] [17:25:03:116] [BRD] CH 0 [27012] [S&C] [CAD] 43272 -> 1453 | [SPD] 43131 -> 4984
[ 1383] [17:25:03:140] [BRD] CH 0 [13280] [S&C] [CAD] 06825 -> 1351 | [SPD] 06818 -> 5247
[ 1386] [17:25:03:363] [BRD] CH 0 [27012] [S&C] [CAD] 43272 -> 1453 | [SPD] 43131 -> 4984
[ 1387] [17:25:03:388] [BRD] CH 0 [13280] [S&C] [CAD] 06825 -> 1351 | [SPD] 06818 -> 5247
[ 1390] [17:25:03:609] [BRD] CH 0 [27012] [S&C] [CAD] 43272 -> 1453 | [SPD] 43131 -> 4984
[ 1391] [17:25:03:628] [BRD] CH 0 [20381] [S&C] [CAD] 09005 -> 1445 | [SPD] 08883 -> 4504
[ 1395] [17:25:03:883] [BRD] CH 0 [13280] [S&C] [CAD] 07521 -> 1352 | [SPD] 07364 -> 5250
[ 1397] [17:25:04:104] [BRD] CH 0 [27012] [S&C] [CAD] 43938 -> 1454 | [SPD] 43901 -> 4988
[ 1398] [17:25:04:125] [BRD] CH 0 [13280] [S&C] [CAD] 07521 -> 1352 | [SPD] 07364 -> 5250
[ 1401] [17:25:04:349] [BRD] CH 0 [27012] [S&C] [CAD] 44604 -> 1455 | [SPD] 44492 -> 4991
[ 1405] [17:25:04:864] [BRD] CH 0 [20381] [S&C] [CAD] 10255 -> 1447 | [SPD] 10085 -> 4510
[ 1406] [17:25:04:866] [BRD] CH 0 [13280] [S&C] [CAD] 00260 -> 44611 | [SPD] 44968 -> 5230
[ 1407] [17:25:04:869] [BRD] CH 0 [13280] [S&C] [CAD] 08218 -> 1353 | [SPD] 08092 -> 5254
[ 1410] [17:25:05:091] [BRD] CH 0 [27012] [S&C] [CAD] 45279 -> 1456 | [SPD] 45277 -> 4995
[ 1413] [17:25:05:338] [BRD] CH 0 [27012] [S&C] [CAD] 45279 -> 1456 | [SPD] 45277 -> 4995
[ 1414] [17:25:05:358] [BRD] CH 0 [20381] [S&C] [CAD] 10255 -> 1447 | [SPD] 10085 -> 4510
[ 1417] [17:25:05:589] [BRD] CH 0 [27012] [S&C] [CAD] 45945 -> 1457 | [SPD] 45854 -> 4998
[ 1418] [17:25:05:610] [BRD] CH 0 [13280] [S&C] [CAD] 08914 -> 1354 | [SPD] 08805 -> 5258
[ 1421] [17:25:05:832] [BRD] CH 0 [27012] [S&C] [CAD] 45945 -> 1457 | [SPD] 45854 -> 4998
[ 1422] [17:25:05:854] [BRD] CH 0 [13280] [S&C] [CAD] 09610 -> 1355 | [SPD] 09522 -> 5262
[ 1425] [17:25:06:103] [BRD] CH 0 [13280] [S&C] [CAD] 09610 -> 1355 | [SPD] 09522 -> 5262
[ 1428] [17:25:06:325] [BRD] CH 0 [27012] [S&C] [CAD] 46611 -> 1458 | [SPD] 46432 -> 5001
[ 1429] [17:25:06:349] [BRD] CH 0 [13280] [S&C] [CAD] 10317 -> 1356 | [SPD] 10242 -> 5266
[ 1431] [17:25:06:573] [BRD] CH 0 [27012] [S&C] [CAD] 46611 -> 1458 | [SPD] 46432 -> 5001
[ 1434] [17:25:06:822] [BRD] CH 0 [27012] [S&C] [CAD] 47266 -> 1459 | [SPD] 47190 -> 5005
[ 1435] [17:25:06:841] [BRD] CH 0 [13280] [S&C] [CAD] 10317 -> 1356 | [SPD] 10242 -> 5266
[ 1436] [17:25:07:066] [BRD] CH 0 [27012] [S&C] [CAD] 47266 -> 1459 | [SPD] 47190 -> 5005
[ 1437] [17:25:07:084] [BRD] CH 0 [20381] [S&C] [CAD] 12129 -> 1450 | [SPD] 12086 -> 4520
[ 1438] [17:25:07:089] [BRD] CH 0 [13280] [S&C] [CAD] 11013 -> 1357 | [SPD] 10957 -> 5270
[ 1440] [17:25:07:311] [BRD] CH 0 [27012] [S&C] [CAD] 47266 -> 1459 | [SPD] 47190 -> 5005
[ 1441] [17:25:07:335] [BRD] CH 0 [13280] [S&C] [CAD] 11013 -> 1357 | [SPD] 10957 -> 5270
If you look at Device ID 13280, at 17:25:04:866 there is a packet which does not belong there. If you look at the RED boxed numbers, it seems to be something that was supposed to be for Device ID 27012.
The checksums are good though, so I have no idea how this happens. Could it be possible that the checksums match, yet the packets get mixed up anyway?
Image Attachments
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