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# Device Drop Detection

A Support Application 6 feature that detects and reports physical device drops.

## Overview

Use Device Drop Detection to monitor the accelerometer for a free-fall signature followed by an impact spike, and report detected drops as a devicedrop event. This gives fleet operators visibility into physical device damage risk and history without relying on self-reporting.

Device Drop Detection is enabled by default. Free-fall is detected when acceleration drops below 2.0 m/s², impact is detected when acceleration spikes above 25.0 m/s², and a 5000 ms cooldown applies between reported drop events.

## User Guide

To configure Device Drop Detection, complete the following steps:

1. Set `dropFreeFallThresholdMs2` to the acceleration value below which motion is treated as free-fall.
2. Set `dropImpactThresholdMs2` to the acceleration spike value that, following a qualifying free-fall, is treated as an impact.
3. Set `dropMinFreeFallDurationMs` to filter out brief sensor noise by requiring a minimum free-fall duration.
4. Set `dropCooldownMs` to the minimum time between two reported drop events.

## Configuration

### Configuring Free-Fall Sensitivity

Set `dropFreeFallThresholdMs2` to the acceleration value below which motion is treated as free-fall. The default is 2.0:

```json
"bfSupportAgent": {
 "dropFreeFallThresholdMs2": 2.0
}
```

### Configuring Impact Sensitivity

Set `dropImpactThresholdMs2` to the acceleration spike value that, following a qualifying free-fall, is treated as an impact. The default is 25.0:

```json
"bfSupportAgent": {
 "dropImpactThresholdMs2": 25.0
}
```

### Configuring Minimum Free-Fall Duration

Set `dropMinFreeFallDurationMs` to the minimum free-fall duration, in milliseconds, before an impact counts as a drop. This filters out brief sensor noise. The default is 80:

```json
"bfSupportAgent": {
 "dropMinFreeFallDurationMs": 80
}
```

### Configuring Drop Cooldown

Set `dropCooldownMs` to the minimum time, in milliseconds, between two reported drop events. The default is 5000:

```json
"bfSupportAgent": {
 "dropCooldownMs": 5000
}
```

This table provides the settings for the Device Drop Detection feature.

| Configuration               | Type    | Default | Description                                                                                    |
| --------------------------- | ------- | ------- | ---------------------------------------------------------------------------------------------- |
| `dropFreeFallThresholdMs2`  | Float   | 2.0     | Acceleration below this value is treated as free-fall                                          |
| `dropImpactThresholdMs2`    | Float   | 25.0    | Acceleration spike above this value, following a qualifying free-fall, is treated as an impact |
| `dropMinFreeFallDurationMs` | Integer | 80      | Minimum free-fall duration before an impact counts as a drop (filters out brief sensor noise)  |
| `dropCooldownMs`            | Integer | 5000    | Minimum time between two reported drop events                                                  |

## Putting It All Together

For the example described above, the full configuration for the Device Drop Detection feature is as follows:

```json
"bfSupportAgent": {
 "dropFreeFallThresholdMs2": 2.0,
 "dropImpactThresholdMs2": 25.0,
 "dropMinFreeFallDurationMs": 80,
 "dropCooldownMs": 5000
}
```


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