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traccar-test-01 [2019/01/29 09:13] chajh |
traccar-test-01 [2021/04/13 06:54] |
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- | ===== Traccar Client on Old Smartphones ===== | ||
- | Code (Finding ghosts): [[https:// | ||
- | |||
- | ==== Intro ==== | ||
- | We have been studying differences of daily activity between disable people and non-disable. So, we had to gather people' | ||
- | Anyway, we adopted Traccar as our GPS tracking platform base, and we'd already tried several experiments. It worked well, but we got a bad news recently. \\ | ||
- | ==== What's the problem? ==== | ||
- | GPS is only available outdoors. Today, GPS tracking system are usually built in vehicles such as airplane, ships, trucks, and taxis. They move most of the time except for a few minutes on a shaded path such as a tunnel. So, it's easy to get the location data from these objects. There are not too many tracking devices that also fit perfectly by types of vehicle. Well then. How about the location of people? Can we still get data from individual person through GPS Tracker like Traccar?\\ | ||
- | |||
- | Today' | ||
- | So, we got some potential issues: | ||
- | * Most of data are not real value. It is an estimated value of its place. | ||
- | * The tracker device are so varied. It is so hard to comprehend. | ||
- | |||
- | Besides, it is sufficient so that we can get the places our participant visits, although we don't catch actual location where they are in each place. | ||
- | ==== Bad news? ==== | ||
- | While we believe we know the testers' | ||
- | - If any movement was existed in the gap, the data for many hours have been lost. | ||
- | - If not, it is fine. Nothing to do. | ||
- | |||
- | We must look into which is right. | ||
- | ==== Test ==== | ||
- | Unfortunately, | ||
- | |||
- | Test starts: 20190121 | ||
- | ^Name^Phone^OS Ver.^Traccar Ver.^Network^Major problem^ | ||
- | |DBLAB0102|iPhone 6|12.1.2|5.5 (latest in iOS)|Only Wi-Fi (tethered to other phone' | ||
- | |DBLAB0103|Samsung Galaxy S5|6.0.1|5.17 (latest in Android)|Only Wi-Fi (tethered to other phone' | ||
- | |||
- | Both devices have sent location data for a week. | ||
- | To get more information, | ||
- | |||
- | ==== Result and Analysis ==== | ||
- | We configured the client to send its location every 60 seconds. Theoretically, | ||
- | ^ ^ < 2 min ^ 5 ^ 30 ^ 60 ^ 120 ^ 180 ^ 360 ^ > 360 ^ total ^ % of < 2 min ^ | ||
- | ^DBLAB0102| 5045 | 44 |3|0 |2|0|4|4|5102| 98.8827 | | ||
- | ^DBLAB0103| 8192 | 121 |6|14|5|1|3|0|8342| 98.2018 | | ||
- | Overall | ||
- | The result in detail is written in GitHub above. | ||
- | |||
- | === Case 1: Low battery and shutting down === | ||
- | === Case 2: Low battery and energy saving mode === | ||
- | === Case 3: Sleep mode/idle === | ||
- | === Case 4: Process killed by OS === | ||