android: added scrcpy, linked ip webcam better

wiki/android/scrcpy.md

@@ -0,0 +1,20 @@
+# scrcpy
+
+[scrcpy](https://scrcpy.org/) is an application that allows remote
+mirroring of an [Android phones](/wiki/android.md) screen aswell as controlling it.
+
+## Setup
+
+scrcpy needs to be set up on the computer that displays the mirror of the smartphone used.
+
+Setup files for [Windows](/wiki/windows.md) can be found on the
+[official website](https://scrcpy.org/download/).
+Alternatively most [Linux systems](/wiki/linux/package_manager.md) feature a package named
+`scrcpy`.
+
+## Usage
+
+Connect the phone which is to be controlled with the computer via USB.
+Make sure USB debugging is enabled in the phones setting.
+Afterwards start up scrcpy.
+It is possible that debugging has to be confirmed on the phone again after starting the application.

wiki/smart_devices.md

@@ -20,3 +20,22 @@ They can include biomonitoring and other applications.
 Smartwatches and bands are often connected to a smartphone.
 On [Android phones](/wiki/android.md) [Gadgetbridge](/wiki/android/gadgetbridge.md) can be used as
 an alternative to proprietary applications by the smart devices' vendor.
+
+## Smartphones and Tablet Computers
+
+Smartphones and Tablet computers are among the most used electronic devices.
+They are often used to [communicate](/wiki/communication.md) or
+[surfing the internet](/wiki/web_browser.md).
+
+### Remote Control and Screen Mirroring
+
+[Android](/wiki/android.md) based devices can use [scrcpy](/wiki/android/scrcpy.md) to mirror the
+screen and allow controlling it by a [Windows](/wiki/windows.md) or [Linux](/wiki/linux.md) system.
+
+### Usage as a Webcam
+
+Smartphones and Tablet computers usually are equipped with a decent camera.
+If a [Linux](/wiki/linux.md) or [Windows](/wiki/windows.md) system is missing a
+[webcam](/wiki/webcams.md) which is only rarely used it can be useful to repurpose the smart device
+as a webcam.
+This can be done as explained in the [webcam entry](/wiki/webcams.md#using-a-smartphone-as-webcam).