StepCounter App:

This app is designed to track the number of steps you take, using Sensor.TYPE_STEP_COUNTER . When the app starts, it also starts a timer right away. As you walk, the app will show the number of steps you've taken and the time recorded by the timer on the screen.

Device Information:

Brand:	isafemobile
Name:	IS_SW1
Android Version:	8.1.0
SDK Version:	27
OS	AOSP

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Problem Describtion:

When the watch is restarted, it doesn't immediately begin transmitting data about steps taken. There's a noticeable lag—sometimes over a minute—before it starts recording the number of steps. However, after this initial delay, it updates the app with all the steps taken during that time. For example, in a demonstration video, the app shows a sudden jump to 668 steps at the very beginning, suggesting that the watch is counting steps but not sending the information in real-time for some reason.

Demonstration Video

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📋 Analyze & Observations

🛠️ Install ADB Wi-Fi to ease debugging of the step counter sensor on smartwatches without the need for a dock station that often disconnects upon movement. Check it out here!

Debug steps are taked to observe sensor behaviour and the Apps reponses. the App always respond to any sensor data comes from sensor-device [check step 2.]

step 1. Enable debuggable-mode:

1. Press the Power-Button, scroll down, and choose Settings
2. Scroll down to About Device
3. Locate SN No. and press it 10 times continuously
4. Press the Back-Button
5. Press and hold the Settings label until "TestTools" opens, then activate the toggle for Debuggable

step 2. Monitor sensor data of step counter

1. adb shell
2. getevent -i
3. noting the device name -sc stands for step-counter : "GR5515-sc device 9: /dev/input/event4"
4. getevent /dev/input/event4
5. Shake the device to initiate the step counter sensor due to movement and check the output on the terminal

step 3. Check who use sensorservice

adb shell dumpsys sensorservice shows 2 active connections: It is worth mentioning that when the sensor is properly started upon reboot, both apps are able to read the sensor data for counting steps without contradiction.

• com.ism.sensors.stepcounter.presentation.StepCounterSensor [this Repository]
• com.sikey.commonservice.service.sensor.SensorListener

step 4. Check when sensor-event is being called

adb logcat | Select-String "sensor" logs shows on WatchShaking the following SENSOR_EVENT:

• 11-07 13:13:09.020 1099 1460 D LocalSocketMessageParser: SENSOR_EVENT

while on the another terminal $getevent /dev/input/event4 send no data.

step 5. Hardware details of step counter sensor

$ adb shell cat /proc/bus/input/devices Terminal output for Hardware Information for Sensor.TYPE_STEP_COUNTER device :

• I: Bus=0000 Vendor=0000 Product=0000 Version=0000 N: Name="GR5515-sc" P: Phys= S: Sysfs=/devices/soc/78b7000.spi/spi_master/spi32766/spi32766.0/input/input4 U: Uniq= H: Handlers=event4 B: PROP=0 B: EV=9 B: ABS=100 8

Manufacturer Documentation

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🖼️ Screenshots

⚙️Technologies

• Kotlin KTX
• MVVM
• Jetpack Compose
• Coroutines