# Reed switch on/off WiFi

Reed on/off WiFi is similar to the original mode as it sends a message when the reed contact is switched on by a magnet and also sends one when the sensor is switched off as no magnetic field is detected anymore. All mode-specific events are sent with 3 MAC addresses for better localisation precision.

Reed switch on/off WiFi

**Hex value:** 0x19

**Use cases:** Garage doors, warehouse doors, fridges, anything where reporting contact is important

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

**Required sensors:** Reed contact, WiFi module

**Mode-specific deltas:**

**Deltas** are mode-specific register values different from *register default values*.

| **Register (hex)**                  | **Default (hex)** | **Delta (hex)**   | **Delta information**  |
| ----------------------------------- | ----------------- | ----------------- | ---------------------- |
| Sleep time (0x04)                   | 1 minute (0x41)   | 12 seconds (0x0C) | Sleep time decreased   |
| Reed contact detection delay (0x4B) | 0 seconds (0x00)  | 5 seconds (0x05)  | Detection delay active |

**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**                                                          |
| ------- | ------------------------------ | --------- | ------------------------------------------------------------------------------ |
| 0x94    | Reed contact on with WiFi 1/2  | 1         | Reed contact switched on because of magnet presence, sent with 3 MAC addresses |
| 0x95    | Reed contact on with WiFi 2/2  | 1         |                                                                                |
| 0x96    | Reed contact off with WiFi 1/2 | 2         | Reed contact switched off because of magnet absence, sent with 3 MAC addresses |
| 0x97    | Reed contact off with WiFi 2/2 | 2         |                                                                                |

**Registers relevant for this mode:**

| **Hex** | **Register name**               | **Default value (hex)** |
| ------- | ------------------------------- | ----------------------- |
| 0x37    | Reed contact measurement period | 1 second (0x10)         |
| 0x4B    | Reed contact detection delay    | 0 seconds (0x00)        |

**Similar modes:**

| **Hex** | **Mode name**            | **Description**                          |
| ------- | ------------------------ | ---------------------------------------- |
| 0x0C    | Reed on/off              | Original version of Reed on/off, no WiFi |
| 0x37    | Reed on/off WiFi Atlas   | WiFi Atlas version of Reed on/off        |
| 0x55    | Reed on/off WiFi Precise | WiFi Precise version of Reed on/off      |

**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 **Reed on/off WiFi** messages:

* To set this mode, the downlink needs to include this mode register setting: **0119**
* The uplink messages need to begin with the mode hex as the first byte: **19**
* When arming the device, you should see this message: **1910**
* When the device is armed, it should send you these two bytes: **1911**
* If you disarm the device via long press, you should receive this message: **1914**


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