# Don’t drop me WiFi

Don’t drop me WiFi behaves similarly to Guard me WiFi (just like the original Don’t drop me is similar to Guard me) except for its event (uplink message) is triggered by faster acceleration of the accelerometer in one of its axis and not just movement detection. Drop alert detection threshold can be defined and the mode-specific event are sent with 3 MAC addresses for better localisation precision.

Don't drop me WiFi

**Hex value:** 0x18

**Use cases:** Monitoring packages inside trucks, shipping containers and more

**Devices that support this mode:** SimplePack Plus

**Required sensors:** Accelerometer, WiFi module

**Mode-specific deltas:** None

**Mode-specific events (uplink messages):**

For more information on what uplink messages (***mode-independent events***) and additional data from various sensors in the device (***appended payload***) can be sent regardless of mode and how to fine-tune message behavior (***alerts***), see *Mode-independent information and events.*

| **Hex** | **Event name**           | **Alert** | **Event information**                                                      |
| ------- | ------------------------ | --------- | -------------------------------------------------------------------------- |
| 9A      | Drop alert with WiFi 1/2 | 3         | <p>Sent when dropped - high acceleration,<br>sent with 3 MAC addresses</p> |
| 9B      | Drop alert with WiFi 2/2 | 3         |                                                                            |

**Registers relevant for this mode:**

If you change the **general sensitivity** of the accelerometer and the magnetometer (0x11 and 0x19), respective **axis registers** reset to 0 as the general settings replace them and vice versa.

| **Hex** | **Register name**                | **Default value (hex)** |
| ------- | -------------------------------- | ----------------------- |
| 0x02    | Departure delay                  | 15 seconds (0x0F)       |
| 0x03    | Arrival delay                    | 10 minutes (0x4A)       |
| 0x04    | Sleep time                       | 1 minute (0x41)         |
| 0x05    | Tracing interval                 | 10 minutes (0x4A)       |
| 0x11    | Accelerometer sensitivity        | 7 (0x07)                |
| 0x12    | Accelerometer X axis sensitivity | 7 (0x07)                |
| 0x13    | Accelerometer Y axis sensitivity | 7 (0x07)                |
| 0x14    | Accelerometer Z axis sensitivity | 7 (0x07)                |
| 0x15    | Drop me threshold                | 936 mG (0x60)           |
| 0x16    | Drop me duration                 | 200 ms (0x02)           |
| 0x17    | Drop me axis configuration       | 7 (0x07)                |
| 0x3C    | Accelerometer measurement period | 1 second (0x01)         |
| 0x49    | Accelerometer detection delay    | 0 seconds (0x00)        |

**Similar modes:**

| **Hex** | **Mode name**              | **Description**                            |
| ------- | -------------------------- | ------------------------------------------ |
| 0x07    | Don’t drop me              | Original version of Don’t drop me, no WiFi |
| 0x33    | Don’t drop me Wifi Atlas   | WiFi Atlas version of Don’t drop me        |
| 0x54    | Don’t drop me Wifi Precise | WiFi Precise version of Don’t drop me      |

**Switching to mode, arming and disarming information:**

Follow the *Basic Operations With SimpleHw Devices guide*, where you can also find information about LED behavior, relevant Sigfox messages and more.

Here’s what’s important for **Don’t drop me WiFi** messages:

* To set this mode, the downlink needs to include this mode register setting: **0118**
* The uplink messages need to begin with the mode hex as the first byte: **18**
* When arming the device, you should see this message: **1810**
* When the device is armed, it should send you these two bytes: **1811**
* If you disarm the device via long press, you should receive this message: **1814**


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