Add Seeed Studio S210x documentation (#1252)

* doc: Initial files add

* doc: Update content

* doc: Apply fixes

Author: LDannijs

doc/content/devices/models/seeed-s210x/_index.md

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+---
+title: "Seeed Studio S210x Series"
+description: ""
+weight: 
+---
+
+{{< figure src="s210x.png" alt="Generic Node Sensor Edition" class="float plain" width="80%">}}
+
+The Seeed Studio [S210x Series](https://www.seeedstudio.com/SenseCAP-S2100-LoRaWAN-Data-Logger-p-5361.html) offers users industrial long-distance data acquisition via LoRaWAN. This series is suitable for a wide variety of different industries such as smart agriculture, smart buildings and industrial control. 
+
+<!--more-->
+
+## Sensor Setup
+
+To acquire the provisioning information and properly setup the sensor you must download the **SenseCap Mate** App from the Play Store or the App Store on your phone.
+
+After opening the app it will ask you to log in/create an account, but you can click on **Skip** in the top right if you don't wish to sign up.
+
+Then click the device you wish to connect to (either the **S210x Sensor** or the **S2100 Data Logger**) and select configuration mode: **Advanced Configuration**. 
+
+The app then explains how to enter Bluetooth pairing mode. Press and hold the button under the device for 3 seconds and release when it starts to blink. Once done click **Device is ready for configuration**. It will then proceed to scan for the device, and it should show up in the list. Click on **your device's serial number** to proceed.
+
+Once you reach the menu of the device, select the **Settings** tab. After that click **Platform** on the dropdown menu. There you need to select **The Things Network**. Make sure the **Frequency Plan** is correct as well. Finally, copy the **Device EUI**, **AppEUI** and **AppKey** and save them as they will be needed later for onboarding.
+
+{{< figure src="sensecap-app-settings.png" alt="Settings tab of the device." width="40%">}}
+
+## Onboarding to {{% tts %}}
+
+The device can be onboarded using the **Device Repository** or **manually**.
+
+{{< note "The S210x does not support onboarding with a QR code." />}}
+
+The [LoRaWAN® Device repository](https://github.com/TheThingsNetwork/lorawan-devices) comprises over 600 end-device profiles, including the Seeed Studio, which enables quick and easy registration with {{% tts %}}.
+
+In the **End device type** section, under **Input method**, select either the **Select the end device in the LoRaWAN Device Repository** or **Enter end device specifics manually** option. The [Onboarding devices without QR codes]({{< ref "/devices/adding-devices/#onboarding-devices-without-qr-codes" >}}) section of the [Adding Devices]({{< ref "/devices/adding-devices/" >}}) guide explains this procedure in detail. Following details are S210x-specific:
+
+- End device brand: **SenseCAP**
+- Model: **S210x** *(replace the 'x' with whichever type you have)*
+- Hardware Ver.: **1.0**
+- Firmware Ver.: **1.0**
+
+After configuring your device, select the **Register end device** button.
+
+{{< figure src="s210x-prov-info-stack.png" alt="Settings for registration through device repository" >}}
+
+If you prefer onboarding **manually**, in the **End device type** section, under **Input Method**, select the **Enter end device specifics manually** option. The [Manually adding devices]({{< ref "/devices/adding-devices/manual/" >}}) and [Over the Air Activation (OTAA)]({{< ref "/devices/adding-devices/manual/otaa/" >}}) guides explain this procedure in detail. Following details are specific to the S210x:
+
+- LoRaWAN version: **LoRaWAN Specification 1.0.2**
+- Regional parameters version: **RP001 Regional Parameters 1.0.2 revision B** 
+
+After configuring your device, select the **Register end device** button.
+
+{{< figure src="manual-register.png" alt="Settings for manual registration" >}}
+
+## Monitoring Live Data
+
+When your device is registered, select the **Live Data** tab to view all messages exchanged between your end device and {{% tts %}}.
+
+{{< figure src="s210x-live-data.png" alt="Live Data tab" >}}