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examples/readme: Improve clarity and adjust categories

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Here is a quick overview of the examples available in the RIOT:
### The Essentials
## The Essentials
- [default](./default)
- [default](./default/README.md)
- This application is a showcase for RIOT's hardware support. Using it
for your board, you should be able to interactively use any hardware
that is supported.
- [hello-world](./hello-world)
- [hello-world](./hello-world/README.md)
- A simple "Hello World" that shows the basic structure of a RIOT application.
- [blinky](./blinky)
- [blinky](./blinky/README.md)
- The classic "Hello World" example for embedded systems: blinking an LED (or printing "Blink!" via stdio when none are available).
- [leds_shell](./leds_shell)
- [leds_shell](./leds_shell/README.md)
- The application `leds_shell` is a basic example, which allows easy, interactive
control of internal board LEDs, and basic GPIO for externally connected simple
devices (for e.g. additional LEDs, relay, motors - via dedicated drivers, etc.)
via the shell.
- [saul](./saul)
- This example demonstrates the usage of the SAUL (Sensor Abstraction Layer User) module.
- [timer_periodic_wakeup](./timer_periodic_wakeup)
- [saul](./saul/README.md)
- This example demonstrates the usage of the SAUL (Sensor Actuator Uber Layer) module.
- [timer_periodic_wakeup](./timer_periodic_wakeup/README.md)
- How to set up a periodic wakeup timer using the RIOT operating system.
- [ipc_pingpong](./ipc_pingpong)
- [ipc_pingpong](./ipc_pingpong/README.md)
- This example is to illustrate the usage of RIOTs IPC messaging system.
- [filesystem](./filesystem)
- [filesystem](./filesystem/README.md)
- This example showcases ways to interact/manage the filesystem in RIOT.
#### RIOT Language Bindings
### RIOT Language Bindings
##### Officially Supported/Targeted
#### Officially Supported/Targeted
###### _Rust_
##### _Rust_
- [rust-hello-world](./rust-hello-world)
- [rust-hello-world](./rust-hello-world/README.md)
- This example demonstrates how to write a simple RIOT application in Rust.
- [rust-gcoap](./rust-gcoap)
- [rust-gcoap](./rust-gcoap/README.md)
- This example demonstrates how to write a coap server application in Rust using the RIOTs gcoap module.
- [rust-async](./rust-async)
- [rust-async](./rust-async/README.md)
- This example demonstrates how to use Rusts async/await syntax in a RIOT application.
###### _C++_
##### _C++_
- [riot_and_cpp](./riot_and_cpp)
- [riot_and_cpp](./riot_and_cpp/README.md)
- Example of using C++ in RIOT applications.
##### Community Supported
#### Community Supported
- [javascript](./javascript)
- [javascript](./javascript/README.md)
- How to write IoT applications using javascript using JerryScript.
- [lua_basic](./lua_basic)
- [lua_basic](./lua_basic/README.md)
- How to write IoT applications using Lua.
- [lua_REPL](./lua_REPL)
- [lua_REPL](./lua_REPL/README.md)
- This example demonstrates how to use the Lua Read-Eval-Print Loop (REPL) in RIOT.
- [micropython](./micropython)
- [micropython](./micropython/README.md)
- How to use the MicroPython port for RIOT.
- [wasm](./wasm)
- [wasm](./wasm/README.md)
- How to use WebAssembly in RIOT.
- [arduino_hello-world](./arduino_hello-world/README.md)
- This application demonstrates the usage of Arduino sketches in RIOT.
### Networking & BLE Examples
## Networking
#### Constraint Application Protocol (CoAP)
### Constraint Application Protocol (CoAP)
- [gcoap](./gcoap)
- [gcoap](./gcoap/README.md)
- This example demonstrates the usage of the `gcoap` module, a high-level API for CoAP (Constrained Application Protocol) messaging.
- [gcoap_block_server](./gcoap_block_server)
- [gcoap_block_server](./gcoap_block_server/README.md)
- CoAP server handling for Block requests, build with gcoap using nanocoap block handling functions.
- [gcoap_fileserver](./gcoap_fileserver)
- [gcoap_fileserver](./gcoap_fileserver/README.md)
- This example demonstrates the usage of the `gcoap`
module to serve files over CoAP.
- [gcoap_dtls](./gcoap_dtls)
- This example demonstrates the usage of the `gcoap` module with DTLS.
- [nanocoap_server](./nanocoap_server)
- This example demonstrates the usage of the `nanocoap` module, a low-level API for CoAP (Constrained Application Protocol) messaging.
- [nanocoap_server](./nanocoap_server/README.md)
- This example demonstrates the usage of the `nanocoap` module, a high-level API for CoAP (Constrained Application Protocol) messaging.
#### Bluetooth Low Energy (BLE)
### Bluetooth Low Energy (BLE)
- [nimble_scanner](./nimble_scanner)
#### NimBLE
- [nimble_scanner](./nimble_scanner/README.md)
- This example showcases the usage of the `NimBLE` BLE stack as a scanner.
- [skald_eddystone](./skald_eddystone)
- This example demonstrates the usage of `Skald` for creating an Google `Eddystone` beacon.
- [skald_ibeacon](./skald_ibeacon)
- This example demonstrates the usage of `Skald` for creating an Apple `iBeacon`.
- [nimble_gatt](./nimble_gatt)
- [nimble_gatt](./nimble_gatt/README.md)
- This example application configures and runs the NimBLE BLE stack as simple GATT
server.
- [nimble_heart_rate_sensor](./nimble_heart_rate_sensor)
- [nimble_heart_rate_sensor](./nimble_heart_rate_sensor/README.md)
- This example demonstrates how to implement asynchronous data transfer using GATT
notifications by implementing a mock-up BLE heart rate sensor.
- [nimble_heart_rate_sensor](./nimble_heart_rate_sensor/README.md)
- This example demonstrates how to implement asynchronous data transfer using GATT
notifications by implementing a mock-up BLE heart rate sensor.
#### MQTT
#### Misc BLE Examples
- [asymcute_mqttsn](./asymcute_mqttsn)
- [skald_eddystone](./skald_eddystone/README.md)
- This example demonstrates the usage of `Skald` for creating an Google `Eddystone` beacon.
- [skald_ibeacon](./skald_ibeacon/README.md)
- This example demonstrates the usage of `Skald` for creating an Apple `iBeacon`.
### MQTT
- [asymcute_mqttsn](./asymcute_mqttsn/README.md)
- This application demonstrates the usage of the Asymcute (MQTT-SN) module in RIOT.
- [emcute_mqttsn](./emcute_mqttsn)
- [emcute_mqttsn](./emcute_mqttsn/README.md)
- This application demonstrates the usage of the emCute (MQTT-SN) module in RIOT.
- [paho-mqtt](./paho-mqtt)
- [paho-mqtt](./paho-mqtt/README.md)
- This example demonstrates the usage of the Paho MQTT client library in RIOT.
#### CoRE Resource Directory
### CoRE Resource Directory
- [cord_ep](./cord_ep)
- [cord_ep](./cord_ep/README.md)
- Example of RIOT's Resource Directory (RD) endpoint module, called `cord_ep`
- [cord_lc](./cord_lc)
- [cord_lc](./cord_lc/README.md)
- Example of RIOT's Resource Directory (RD) lookup module, called `cord_lc`
- [cord_epsim](./cord_epsim)
- [cord_epsim](./cord_epsim/README.md)
- This example shows how a node can register with a CoRE resource directory
#### GNRC Networking
### GNRC Networking
- [gnrc_minimal](./gnrc_minimal)
- [gnrc_minimal](./gnrc_minimal/README.md)
- This is a minimalistic example for RIOT's gnrc network stack.
- [gnrc_networking](./gnrc_networking)
- [gnrc_networking](./gnrc_networking/README.md)
- This example demonstrates the usage of the GNRC network stack in RIOT.
- [gnrc_networking_subnets](./gnrc_networking_subnets)
- [gnrc_networking_subnets](./gnrc_networking_subnets/README.md)
- This example demonstrates IPv6 subnet auto-configuration for networks on
a tree topology.
- [gnrc_border_router](./gnrc_border_router)
- [gnrc_border_router](./gnrc_border_router/README.md)
- Example of `gnrc_border_router` using automatic configuration
- [gnrc_lorawan](./gnrc_lorawan)
- [gnrc_lorawan](./gnrc_lorawan/README.md)
- Send and receive LoRaWAN packets and perform basic LoRaWAN commands
- [gnrc_networking_mac](./gnrc_networking_mac)
- [gnrc_networking_mac](./gnrc_networking_mac/README.md)
- This example shows you how to try out communications between RIOT instances with duty-cycled MAC layer protocols
#### Misc
### DTLS
- [lorawan](./lorawan)
- [dtls-sock](./dtls-sock/README.md)
- This example shows how to use DTLS sock `sock_dtls_t`
- [dtls-echo](./dtls-echo/README.md)
- This example shows how to use TinyDTLS with sock_udp.
- [dtls-wolfssl](./dtls-wolfssl/README.md)
- This example demonstrates the usage of the DTLS module with the wolfSSL library.^
### Misc
- [lorawan](./lorawan/README.md)
- This application shows a basic LoRaWAN use-case with RIOT.
- [openthread](./openthread)
- [openthread](./openthread/README.md)
- This example demonstrates the usage of the OpenThread stack in RIOT.
- [lwm2m](./lwm2m)
- [lwm2m](./lwm2m/README.md)
- Example of a LWM2M client on RIOT
- [ccn-lite-relay](./ccn-lite-relay)
- [ccn-lite-relay](./ccn-lite-relay/README.md)
- This application demonstrates how to use the Content-Centric Networking stack
from [CCN-Lite](http://www.ccn-lite.net/) on RIOT
- [telnet_server](./telnet_server)
- [telnet_server](./telnet_server/README.md)
- Simple telnet server that listens on port 23 over IPv6.
- [posix_sockets](./posix_sockets)
- [posix_sockets](./posix_sockets/README.md)
- Showcase for RIOT's POSIX socket support
- [spectrum-scanner](./spectrum-scanner)
- [spectrum-scanner](./spectrum-scanner/README.md)
- This example demonstrates how to monitor energy levels on all available wireless channels
- [sniffer](./sniffer)
- [sniffer](./sniffer/README.md)
- This application is built to run together with the script `./tools/sniffer.py`
as a sniffer for (wireless) data traffic.
- [dtls-sock](./dtls-sock)
- This example shows how to use DTLS sock `sock_dtls_t`
- [dtls-echo](./dtls-echo)
- This example shows how to use TinyDTLS with sock_udp.
- [dtls-wolfssl](./dtls-wolfssl)
- This example demonstrates the usage of the DTLS module with the wolfSSL library.
### Advanced Examples
## Advanced Examples
- [bindist](./bindist)
- [bindist](./bindist/README.md)
- RIOT allows for creating a "binary distribution", which can be used to ship
proprietary, compiled objects in a way that makes it possible to re-link them
against a freshly compiled RIOT. This application serves as a simple example.
- [usbus_minimal](./usbus_minimal)
- [usbus_minimal](./usbus_minimal/README.md)
- This is a minimalistic example for RIOT's USB stack.
- [suit_update](./suit_update)
- [suit_update](./suit_update/README.md)
- This example shows how to integrate SUIT-compliant firmware updates into a
RIOT application.
- [thread_duel](./thread_duel)
- [thread_duel](./thread_duel/README.md)
- This is a thread duel application to show RIOTs abilities to run multiple-threads
concurrently, even if they are neither cooperative nor dividable into different scheduler priorities, by using the optional round-robin scheduler module.
- [posix_select](./posix_select)
- [posix_select](./posix_select/README.md)
- This example is a showcase for RIOT's POSIX select support
- [psa_crypto](./psa_crypto)
- Basic functions of the PSA Crypto API- [nimble_heart_rate_sensor](./nimble_heart_rate_sensor)
- This example demonstrates how to implement asynchronous data transfer using GATT
notifications by implementing a mock-up BLE heart rate sensor.
- [pio_blink](./pio_blink)
- Basic functions of the PSA Crypto API
- [pio_blink](./pio_blink/README.md)
- How to use the PIO peripheral on the RaspberryPi Pico to blink an LED.
- [arduino_hello-world](./arduino_hello-world)
- This application demonstrates the usage of Arduino sketches in RIOT.
- [twr_aloha](./twr_aloha)
- [twr_aloha](./twr_aloha/README.md)
- This example allows testing different two-way ranging algorithms between
two boards supporting a dw1000 device. This makes use of the uwb-core
pkg.

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# Periodic Wakeup Timer Example
This example demonstrates how to set up a periodic wakeup timer using the RIOT operating system.
## Overview
The application sets up a timer that periodically wakes up the system and performs a specific task. This is useful for applications that need to perform regular actions, such as sensor readings or data transmissions.
## Usage
Once the application is running, you should see periodic messages indicating that the timer has triggered and the system has woken up to perform its task.

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# Periodic Wakeup Timer Example
This example demonstrates how to set up a periodic wakeup timer using the RIOT operating system.
## Overview
The application sets up a timer that periodically wakes up the system and performs a specific task. This is useful for applications that need to perform regular actions, such as sensor readings or data transmissions.
## Requirements
- RIOT OS
- A supported hardware platform
## Setup
1. Clone the RIOT repository:
```sh
git clone https://github.com/RIOT-OS/RIOT.git
cd RIOT
```
2. Navigate to the example directory:
```sh
cd examples/timer_periodic_wakeup
```
3. Build the application for your target hardware:
```sh
make BOARD=<your-board>
```
4. Flash the application to your hardware:
```sh
make flash
```
5. Connect to the board's serial console to observe the output:
```sh
make term
```
## Usage
Once the application is running, you should see periodic messages indicating that the timer has triggered and the system has woken up to perform its task.