# GCS connection

### Standard issue - behavior:

Doodle Labs wearable module and Stribog UAV link is established, but GCS software does not connect.

To check if the link is established refer to this section [Flight preparation](/uas-platforms/nexus-stribog-uas/stribog-uas-user-manual/before-flight-procedures/flight-preparation.md).

### Standard fix:

Ensure that you are on predefined wired connection profile with IPv4 manually configured.

Steps to check this:

1. **Click the network icon** (top-right corner of the screen).
2. Select **“Wired Connected”** → Click **“Wired Settings”**.
3. In the **Settings** window, click the gear icon ⚙ next to the wired connection.
4. Go to the **IPv4** tab.
5. Check the method:
   * If it says **“Manual”**, then it's using a static IP.
   * Below it, you’ll see the manually set IP address, subnet, and gateway.

<figure><img src="/files/C0vJHa5tEgjcZ4I4aOfm" alt=""><figcaption></figcaption></figure>

If the network interface does not contain manual **IPv4** you need to configure it and reconnect the network interface. Default subnet of Doodle Labs network is `10.223.x.x` and the subnet mask is `255.255.0.0` .

**Next step (in Nexus):**\
Open **Shepard** on the Getac laptop by going to `localhost:3001` in your web browser.\
Set the IP address of the Ground Control Station to the IPv4 address you configured in the previous step.\
Click the **Edit config** button.\
Enter the IPv4 address of the device connected to the Doodle Labs network that is running the **Nexus** app.\
This address must be from the `10.223.x.x` subnet.\
Click the **Deploy** button at the bottom.\
All of these settings are in **Shepard** at `localhost:3001`.

<figure><img src="/files/TWfrzW4NIr2LOBGPssxY" alt=""><figcaption></figcaption></figure>


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