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+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
+
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+name = "zerocopy"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0"
+dependencies = [
+ "byteorder",
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.7.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.77",
+]
+
+[[package]]
+name = "zeroize"
+version = "1.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..b328c44
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,15 @@
+[workspace]
+members = [
+    "src/keret-controller",
+    "src/keret-adapter",
+    "src/keret-controller-transmit",
+    "src/keret-service-transmit",
+    "src/keret-service",
+]
+
+resolver = "2"
+
+[profile.release]
+codegen-units = 1
+debug = true
+lto = true
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..bccc2df
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,8 @@
+FROM scratch
+LABEL authors=":kelko:"
+
+COPY target/aarch64-unknown-linux-musl/release/keret-service .
+
+EXPOSE 3000
+
+ENTRYPOINT ["./keret-service"]
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..88d96ff
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 Gregor :kelko: Karzelek
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e53d9b5
--- /dev/null
+++ b/README.md
@@ -0,0 +1,42 @@
+keret 
+===================
+
+keret ("kelkos embedded rust example: tracker") is pronounced like the english word "carrot".
+
+As the full name indicates it is an example I made to try out and familiarize myself with embedded rust programming. It uses a [micro:bit v2 microcontroller](http://microbit.org/new-microbit/) and the code is heavily influenced by / based upon the [rust embedded discovery book](https://docs.rust-embedded.org/discovery/microbit/).
+
+
+Scenario
+-------
+
+The micro:bit controller is used as physical control for a activity timer. The user can start timing an activiy by pressing the "B" button. Hitting the "B" a second time stops the activity and reports the duration via serial port.
+
+A started activity (as well as potential error states) can be reset by pressing the "A" button.
+
+On a (USB-)connected device (e.g. a RasPi) the report is read from the serial port and extended by current timestamp before it's send via HTTP POST to a service.
+
+Somewhere (e.g. inside a Kubernetes cluster or locally on some host) there is the service running, receiving the full report (timestamp and duration) and storing it onto disc. This list can be read from the service.
+
+Goals
+---------
+
+This example tries to show how to program a microcontroller via Rust. It uses the display, the buttons, the internal timer and the serial port of the micro:bit board. And while doing to I tried to built it in a structured way with "typical" error handling as I would do it for CLIs / services on a fully-fledged OS-driven device.
+
+To see how basically the same way of programming is possible on such a restricted environment (e.g. no heap -> no alloc) as is on fully-fledged devices or in the cloud the two other parts where also constructed. Each operates on a different level of hardware abstraction, but each code reads quite similar.
+
+
+Components
+--------------
+
+- **keret-controller**: The code running on the micro:bit microcontroller
+- **keret-adapter**: The CLI running on the connected device, reading the reports from the serial port and forwarding to the service
+- **keret-service**: The REST API service receiving and storing the activity reports
+
+TODO
+-----
+
+### time handing ("now()")
+
+this is rudimentary at best and rather broken, as it does not yet handle timer wraps currently. Waiting for either microbit-v2 crate to switch to embassy or otherwise understand which interrupt is caused by the SYST clock.
+
+But this does not hinder the usability of the example to showcase the original goal.
diff --git a/src/keret-adapter/Cargo.toml b/src/keret-adapter/Cargo.toml
new file mode 100644
index 0000000..8e055b1
--- /dev/null
+++ b/src/keret-adapter/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "keret-adapter"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+snafu = "0.8.4"
+clap = { version = "4.5.17", features = ["derive"] }
+serialport = "4.5.0"
+keret-controller-transmit = { path = "../keret-controller-transmit" }
+keret-service-transmit = { path = "../keret-service-transmit" }
+reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls"] }
+tokio = { version = "1", features = ["full"] }
diff --git a/src/keret-adapter/src/listening.rs b/src/keret-adapter/src/listening.rs
new file mode 100644
index 0000000..563a361
--- /dev/null
+++ b/src/keret-adapter/src/listening.rs
@@ -0,0 +1,73 @@
+use std::io::ErrorKind;
+use std::time::Duration;
+use serialport::SerialPort;
+use snafu::{ResultExt, Snafu};
+use keret_controller_transmit::ActionReport;
+
+#[derive(Debug, Snafu)]
+pub(crate) enum ListeningError {
+    #[snafu(display("Could not open serial port using {device}"))]
+    CouldNotOpenPort {
+        device: String,
+        source: serialport::Error,
+    },
+    #[snafu(display("Could not read data from serial port"))]
+    CouldNotReadFromPort {
+        source: std::io::Error,
+    }
+}
+
+pub(crate) struct PortListener {
+    port: Box<dyn SerialPort>,
+    buffer: Vec<u8>
+}
+
+impl PortListener {
+    pub(crate) fn new(path: &str) -> Result<Self, ListeningError> {
+        let port = serialport::new(path, 115_200)
+            .timeout(Duration::from_millis(10))
+            .open().context(CouldNotOpenPortSnafu { device: path.to_string() })?;
+
+        let buffer = Vec::<u8>::new();
+
+        Ok(Self {
+            port,
+            buffer
+        })
+    }
+
+    pub(crate) fn read_next_report(&mut self) -> Result<Option<ActionReport>, ListeningError> {
+        let mut read_buffer: Vec<u8> = vec![0; 10];
+
+        match self.port.read(&mut read_buffer) {
+            Ok(length) => {
+                self.buffer.extend_from_slice(&read_buffer[..length]);
+            }
+            Err(e) => {
+                match e.kind() {
+                    ErrorKind::TimedOut => {
+                        return Ok(None);
+                    }
+                    _ => {
+                        return Err(ListeningError::CouldNotReadFromPort { source: e });
+                    }
+                }
+            }
+        };
+
+        if let Some(index) = self.buffer.iter().position(|&x| x == b'\n') {
+            if index == 0 {
+                self.buffer.pop();
+                return Ok(None)
+            }
+            let incoming_report = ActionReport::from_message(&self.buffer[..index]);
+            for _ in 0..=index {
+                self.buffer.pop();
+            }
+
+            Ok(Some(incoming_report))
+        } else {
+            Ok(None)
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/keret-adapter/src/main.rs b/src/keret-adapter/src/main.rs
new file mode 100644
index 0000000..0f860c0
--- /dev/null
+++ b/src/keret-adapter/src/main.rs
@@ -0,0 +1,91 @@
+mod listening;
+mod sending;
+
+use std::path::PathBuf;
+use std::time::Duration;
+use clap::Parser;
+use snafu::{ResultExt, Snafu};
+use crate::listening::PortListener;
+use crate::sending::ReportSender;
+
+#[derive(Parser)]
+#[command(author, version, about, long_about = None)]
+struct Cli {
+    /// Device Path (/dev/...)
+    device: PathBuf,
+
+    /// full URL to post to
+    url: String,
+}
+
+#[derive(Debug, Snafu)]
+pub(crate) enum AppError {
+    #[snafu(display("An error occurred while listening on serial port"))]
+    FailedListeningOnPort {
+        #[snafu(backtrace)]
+        source: listening::ListeningError,
+    },
+    #[snafu(display("An error occurred while trying to send report to target"))]
+    FailedSendingToTarget {
+        #[snafu(backtrace)]
+        source: sending::SendingError,
+    },
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let cli = Cli::parse();
+    let device = cli.device.to_str().unwrap();
+    let url = cli.url;
+
+    let mut listener = match listening::PortListener::new(device) {
+        Ok(l) => l,
+        Err(e) => {
+            report(&e);
+            std::process::exit(1);
+        }
+    };
+
+    let sender = sending::ReportSender::new(url);
+
+    loop {
+        tokio::time::sleep(Duration::from_millis(500)).await;
+
+        match read_and_forward(&mut listener, &sender).await {
+            Ok(()) => {},
+            Err(e) => {
+                report(&e);
+            }
+        }
+    }
+}
+
+async fn read_and_forward(listener: &mut PortListener, sender: &ReportSender) -> Result<(), AppError> {
+    let report = listener.read_next_report().context(FailedListeningOnPortSnafu)?;
+    if let Some(report) =  report {
+        sender.send(report.duration()).await.context(FailedSendingToTargetSnafu)?;
+    }
+
+    Ok(())
+}
+
+pub fn report<E: 'static>(err: &E)
+where
+    E: std::error::Error,
+    E: snafu::ErrorCompat,
+    E: Send + Sync,
+{
+    eprintln!("[ERROR] {}", err);
+    if let Some(source) = err.source() {
+        eprintln!();
+        eprintln!("Caused by:");
+        for (i, e) in std::iter::successors(Some(source), |e| e.source()).enumerate() {
+            eprintln!("   {}: {}", i, e);
+        }
+    }
+
+    if let Some(backtrace) = snafu::ErrorCompat::backtrace(err) {
+        eprintln!("Backtrace:");
+        eprintln!("{}", backtrace);
+    }
+}
\ No newline at end of file
diff --git a/src/keret-adapter/src/sending.rs b/src/keret-adapter/src/sending.rs
new file mode 100644
index 0000000..68aa3f4
--- /dev/null
+++ b/src/keret-adapter/src/sending.rs
@@ -0,0 +1,35 @@
+use snafu::{ResultExt, Snafu};
+use keret_service_transmit::ActionReport;
+
+#[derive(Debug, Snafu)]
+pub(crate) enum SendingError {
+    #[snafu(display("Could not send the report to URL {target}"))]
+    CouldNotSendReport {
+        target: String,
+        source: reqwest::Error
+    }
+
+}
+
+pub(crate) struct ReportSender {
+    target: String
+}
+
+impl ReportSender {
+    pub(crate) fn new(target: String) -> Self {
+        Self { target }
+    }
+
+    pub(crate) async fn send(&self, report: impl Into<ActionReport>) -> Result<(), SendingError> {
+        let report = report.into();
+        let client = reqwest::Client::new();
+
+        let _res = client.post(&self.target)
+            .json(&report)
+            .send()
+            .await
+            .context(CouldNotSendReportSnafu { target: self.target.clone() })?;
+
+        Ok(())
+    }
+}
diff --git a/src/keret-controller-transmit/Cargo.toml b/src/keret-controller-transmit/Cargo.toml
new file mode 100644
index 0000000..7b74b77
--- /dev/null
+++ b/src/keret-controller-transmit/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "keret-controller-transmit"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+base64 = {version = "0.22.1", default-features = false }
+snafu = { version = "0.8.4", default-features = false }
+serde = { version = "1.0.210", default-features = false, features = ["derive"] }
+postcard = { version = "1.0.10" }
+heapless = "0.7.17"
\ No newline at end of file
diff --git a/src/keret-controller-transmit/src/lib.rs b/src/keret-controller-transmit/src/lib.rs
new file mode 100644
index 0000000..241e23b
--- /dev/null
+++ b/src/keret-controller-transmit/src/lib.rs
@@ -0,0 +1,31 @@
+#![no_std]
+
+use postcard::{from_bytes, to_vec};
+use serde::{self, Deserialize, Serialize};
+
+#[derive(Debug, Copy, Clone, Serialize, Deserialize)]
+#[repr(transparent)]
+#[serde(transparent)]
+pub struct ActionReport {
+    duration: u64,
+}
+
+impl ActionReport {
+    pub fn new(duration: u64) -> Self {
+        Self {
+            duration
+        }
+    }
+
+    pub fn from_message(data: &[u8]) -> Self {
+        from_bytes(&data).unwrap()
+    }
+
+    pub fn as_message(&self) -> heapless::Vec<u8,8> {
+        to_vec::<ActionReport,8>(&self).unwrap()
+    }
+
+    pub fn duration(&self) -> u64 {
+        self.duration
+    }
+}
diff --git a/src/keret-controller/Cargo.lock b/src/keret-controller/Cargo.lock
new file mode 100644
index 0000000..a1f1072
--- /dev/null
+++ b/src/keret-controller/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "keret-controller"
+version = "0.1.0"
diff --git a/src/keret-controller/Cargo.toml b/src/keret-controller/Cargo.toml
new file mode 100644
index 0000000..50855f3
--- /dev/null
+++ b/src/keret-controller/Cargo.toml
@@ -0,0 +1,20 @@
+[package]
+name = "keret-controller"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+microbit-v2 = {  version = "0.15.1", features = ["embedded-hal-02"] }
+cortex-m = { version = "0.7.7", features = ["critical-section-single-core"] }
+cortex-m-rt = "0.7.0"
+rtt-target = { version = "0.5.0"}
+panic-rtt-target = { version = "0.1.3"}
+lsm303agr = "1.1.0"
+nb = "1.1.0"
+libm = "0.2.8"
+heapless = "0.8.0"
+tiny-led-matrix = "1.0.2"
+embedded-hal = "1.0.0"
+embedded-hal-nb = "1.0.0"
+snafu = { version = "0.8.4", default-features = false }
+keret-controller-transmit = { path = "../keret-controller-transmit" }
\ No newline at end of file
diff --git a/src/keret-controller/Embed.toml b/src/keret-controller/Embed.toml
new file mode 100644
index 0000000..2195013
--- /dev/null
+++ b/src/keret-controller/Embed.toml
@@ -0,0 +1,11 @@
+[default.general]
+chip = "nrf52833_xxAA"  # micro:bit V2
+
+[default.reset]
+halt_afterwards = false
+
+[default.rtt]
+enabled = true
+
+[default.gdb]
+enabled = false
diff --git a/src/keret-controller/build.rs b/src/keret-controller/build.rs
new file mode 100644
index 0000000..4f6cfd9
--- /dev/null
+++ b/src/keret-controller/build.rs
@@ -0,0 +1,43 @@
+//! This build script copies the `memory.x` file from the crate root into
+//! a directory where the linker can always find it at build time.
+//! For many projects this is optional, as the linker always searches the
+//! project root directory -- wherever `Cargo.toml` is. However, if you
+//! are using a workspace or have a more complicated build setup, this
+//! build script becomes required. Additionally, by requesting that
+//! Cargo re-run the build script whenever `memory.x` is changed,
+//! updating `memory.x` ensures a rebuild of the application with the
+//! new memory settings.
+//!
+//! The build script also sets the linker flags to tell it which link script to use.
+
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+
+fn main() {
+    // Put `memory.x` in our output directory and ensure it's
+    // on the linker search path.
+    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    File::create(out.join("memory.x"))
+        .unwrap()
+        .write_all(include_bytes!("memory.x"))
+        .unwrap();
+    println!("cargo:rustc-link-search={}", out.display());
+
+    // By default, Cargo will re-run a build script whenever
+    // any file in the project changes. By specifying `memory.x`
+    // here, we ensure the build script is only re-run when
+    // `memory.x` is changed.
+    println!("cargo:rerun-if-changed=memory.x");
+
+    // Specify linker arguments.
+
+    // `--nmagic` is required if memory section addresses are not aligned to 0x10000,
+    // for example the FLASH and RAM sections in your `memory.x`.
+    // See https://github.com/rust-embedded/cortex-m-quickstart/pull/95
+    println!("cargo:rustc-link-arg=--nmagic");
+
+    // Set the linker script to the one provided by cortex-m-rt.
+    println!("cargo:rustc-link-arg=-Tlink.x");
+}
\ No newline at end of file
diff --git a/src/keret-controller/memory.x b/src/keret-controller/memory.x
new file mode 100644
index 0000000..9e2ab65
--- /dev/null
+++ b/src/keret-controller/memory.x
@@ -0,0 +1,6 @@
+MEMORY
+{
+  /* NOTE K = KiBi = 1024 bytes */
+  FLASH : ORIGIN = 0x00000000, LENGTH = 256K
+  RAM : ORIGIN = 0x20000000, LENGTH = 16K
+}
diff --git a/src/keret-controller/src/controls.rs b/src/keret-controller/src/controls.rs
new file mode 100644
index 0000000..b5deb1d
--- /dev/null
+++ b/src/keret-controller/src/controls.rs
@@ -0,0 +1,82 @@
+use core::cell::RefCell;
+use cortex_m::interrupt::{free, Mutex};
+use microbit::{
+    hal::gpiote::Gpiote,
+    board::Buttons,
+    pac,
+};
+use microbit::pac::interrupt;
+
+static GPIO: Mutex<RefCell<Option<Gpiote>>> = Mutex::new(RefCell::new(None));
+static INTERACTION_REQUEST: Mutex<RefCell<InteractionRequest>> = Mutex::new(RefCell::new(InteractionRequest::None));
+
+#[derive(Debug,Copy, Clone, Default)]
+pub(crate) enum InteractionRequest {
+    #[default]
+    None,
+    ToggleMode,
+    Reset,
+}
+
+/// Initialise the buttons and enable interrupts.
+pub(crate) fn init_buttons(board_gpiote: pac::GPIOTE, board_buttons: Buttons) {
+    let gpiote = Gpiote::new(board_gpiote);
+
+    let channel0 = gpiote.channel0();
+    channel0
+        .input_pin(&board_buttons.button_a.degrade())
+        .hi_to_lo()
+        .enable_interrupt();
+    channel0.reset_events();
+
+    let channel1 = gpiote.channel1();
+    channel1
+        .input_pin(&board_buttons.button_b.degrade())
+        .hi_to_lo()
+        .enable_interrupt();
+    channel1.reset_events();
+
+    free(move |cs| {
+        *GPIO.borrow(cs).borrow_mut() = Some(gpiote);
+
+        unsafe {
+            pac::NVIC::unmask(pac::Interrupt::GPIOTE);
+        }
+        pac::NVIC::unpend(pac::Interrupt::GPIOTE);
+    });
+}
+
+#[inline(always)]
+pub(crate) fn get_requested_interaction() -> InteractionRequest {
+    free(|cs| {
+        let next = *INTERACTION_REQUEST.borrow(cs).borrow();
+        *INTERACTION_REQUEST.borrow(cs).borrow_mut() = InteractionRequest::None;
+
+        next
+    })
+}
+
+#[interrupt]
+fn GPIOTE() {
+    free(|cs| {
+        if let Some(gpiote) = GPIO.borrow(cs).borrow().as_ref() {
+            let a_pressed = gpiote.channel0().is_event_triggered();
+            let b_pressed = gpiote.channel1().is_event_triggered();
+
+            let request = if a_pressed {
+                InteractionRequest::Reset
+
+            } else if b_pressed {
+                InteractionRequest::ToggleMode
+
+            } else {
+                InteractionRequest::None
+            };
+
+            gpiote.channel0().reset_events();
+            gpiote.channel1().reset_events();
+
+            *INTERACTION_REQUEST.borrow(cs).borrow_mut() = request;
+        }
+    });
+}
diff --git a/src/keret-controller/src/display.rs b/src/keret-controller/src/display.rs
new file mode 100644
index 0000000..9dd6a6e
--- /dev/null
+++ b/src/keret-controller/src/display.rs
@@ -0,0 +1,38 @@
+use core::cell::RefCell;
+use cortex_m::interrupt::{free, Mutex};
+use microbit::display::nonblocking::Display;
+use microbit::gpio::DisplayPins;
+use microbit::pac;
+use microbit::pac::{interrupt, TIMER1};
+use tiny_led_matrix::Render;
+
+static DISPLAY: Mutex<RefCell<Option<Display<TIMER1>>>> = Mutex::new(RefCell::new(None));
+
+pub(crate) fn init_display(board_timer: TIMER1, board_display: DisplayPins) {
+    let display = Display::new(board_timer, board_display);
+
+    free(move |cs| {
+        *DISPLAY.borrow(cs).borrow_mut() = Some(display);
+    });
+    unsafe {
+        pac::NVIC::unmask(pac::Interrupt::TIMER1)
+    }
+}
+
+/// Display an image.
+pub(crate) fn display_image(image: &impl Render) {
+    free(|cs| {
+        if let Some(display) = DISPLAY.borrow(cs).borrow_mut().as_mut() {
+            display.show(image);
+        }
+    })
+}
+
+#[interrupt]
+fn TIMER1() {
+    free(|cs| {
+        if let Some(display) = DISPLAY.borrow(cs).borrow_mut().as_mut() {
+            display.handle_display_event();
+        }
+    })
+}
diff --git a/src/keret-controller/src/domain.rs b/src/keret-controller/src/domain.rs
new file mode 100644
index 0000000..098299c
--- /dev/null
+++ b/src/keret-controller/src/domain.rs
@@ -0,0 +1,63 @@
+use cortex_m::interrupt::free;
+use microbit::hal::uarte;
+
+use crate::{
+    CURRENT_MODE,
+    display::display_image,
+    mode::AppMode,
+    serialize::serialize_message,
+    time::now
+};
+use crate::error::{Error, IncoherentTimestampsSnafu};
+
+pub(crate) fn toggle_mode<T: uarte::Instance>(serial: &mut microbit::hal::uarte::Uarte<T>) -> Result<(), Error> {
+    let current = free(|cs| {
+        *CURRENT_MODE.borrow(cs).borrow()
+    });
+
+    match current {
+        AppMode::Idle => {
+            start_report();
+        },
+        AppMode::Running(start) => {
+            finish_report(serial, start)?;
+        },
+        AppMode::Error | AppMode::Sending => {},
+    };
+
+    Ok(())
+}
+
+fn finish_report<T: uarte::Instance>(serial: &mut microbit::hal::uarte::Uarte<T>, start_timestamp: u64) -> Result<(), Error>{
+    switch_mode(AppMode::Sending);
+
+    let end_timestamp = now();
+    if start_timestamp > end_timestamp {
+        return IncoherentTimestampsSnafu { start: start_timestamp, end: end_timestamp}.fail()
+    }
+
+    let duration = end_timestamp - start_timestamp;
+    serialize_message(serial, duration)?;
+
+    switch_mode(AppMode::Idle);
+
+    Ok(())
+}
+
+fn start_report() {
+    let start_timestamp = now();
+    switch_mode(AppMode::Running(start_timestamp));
+}
+
+#[inline(always)]
+pub(crate) fn reset_mode(){
+    switch_mode(AppMode::Idle);
+}
+
+#[inline(always)]
+pub(crate) fn switch_mode(next: AppMode) {
+    free(|cs| {
+        CURRENT_MODE.borrow(cs).replace(next);
+    });
+    display_image(&next);
+}
diff --git a/src/keret-controller/src/error.rs b/src/keret-controller/src/error.rs
new file mode 100644
index 0000000..09b6bd5
--- /dev/null
+++ b/src/keret-controller/src/error.rs
@@ -0,0 +1,40 @@
+use core::fmt::{Debug, Display, Formatter};
+use snafu::Snafu;
+
+/// compatibility wrapper until core::error is used everywhere
+pub struct UarteError(microbit::hal::uarte::Error);
+
+impl UarteError {
+    pub(crate) fn new(error: microbit::hal::uarte::Error) -> Self {
+        Self(error)
+    }
+}
+
+impl Debug for UarteError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
+        Debug::fmt(&self.0, f)
+    }
+}
+
+impl Display for UarteError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
+        Debug::fmt(&self.0, f)
+    }
+}
+
+impl snafu::Error for UarteError {}
+
+#[derive(Debug,Snafu)]
+#[snafu(visibility(pub(crate)))]
+pub(crate) enum Error {
+    #[snafu(display("Failed writing data to the serial port"))]
+    WritingToSerialPortFailed {
+        #[snafu(source(from(microbit::hal::uarte::Error, UarteError::new)))]
+        source: UarteError
+    },
+    #[snafu(display("Incoherent timestamps. Started at {start} & ended at {end}"))]
+    IncoherentTimestamps {
+        start: u64,
+        end: u64
+    },
+}
diff --git a/src/keret-controller/src/main.rs b/src/keret-controller/src/main.rs
new file mode 100644
index 0000000..1ebbc69
--- /dev/null
+++ b/src/keret-controller/src/main.rs
@@ -0,0 +1,92 @@
+#![no_main]
+#![no_std]
+
+mod display;
+mod mode;
+mod time;
+mod controls;
+mod serialize;
+mod domain;
+mod error;
+
+use rtt_target::{rprintln, rtt_init_print};
+use panic_rtt_target as _;
+
+use core::cell::RefCell;
+use cortex_m::{
+    interrupt::{Mutex},
+    prelude::_embedded_hal_blocking_delay_DelayMs
+};
+use cortex_m_rt::entry;
+use microbit::{
+    board::Board,
+    hal::{Timer,
+    uarte, uarte::Parity, uarte::Baudrate}
+};
+use snafu::Error as _;
+use crate::{
+    domain::switch_mode,
+    display::init_display,
+    controls::init_buttons,
+    time::init_time,
+    mode::AppMode,
+    controls::{get_requested_interaction, InteractionRequest},
+    display::display_image,
+    domain::{reset_mode, toggle_mode},
+    error::Error
+};
+
+static CURRENT_MODE: Mutex<RefCell<AppMode>> = Mutex::new(RefCell::new(AppMode::Idle));
+
+#[entry]
+fn main() -> ! {
+    rtt_init_print!();
+    let Some(board) = Board::take() else {
+        panic!("Could not initialize board. Nothing left to do.");
+    };
+
+    let mut timer = Timer::new(board.TIMER0).into_periodic();
+
+    init_display(board.TIMER1, board.display_pins);
+    init_time(board.SYST);
+    init_buttons(board.GPIOTE, board.buttons);
+
+    let mut serial = uarte::Uarte::new(
+        board.UARTE0,
+        board.uart.into(),
+        Parity::EXCLUDED,
+        Baudrate::BAUD115200,
+    );
+
+    display_image(&AppMode::Idle);
+
+    loop {
+        let request = get_requested_interaction();
+        match request {
+            InteractionRequest::ToggleMode => {
+                if let Err(error) = toggle_mode(&mut serial) {
+                    handle_error(error)
+                }
+            },
+            InteractionRequest::Reset => reset_mode(),
+            InteractionRequest::None => {},
+        }
+
+        timer.delay_ms(500_u32);
+    }
+}
+
+fn handle_error(err: Error) {
+    switch_mode(AppMode::Error);
+    rprintln!("[ERROR] {}", err);
+    let mut source = err.source();
+
+    if source.is_some() {
+        rprintln!("[CAUSE]:");
+    }
+    while let Some(inner) = source {
+        rprintln!("{}", inner);
+
+        source = inner.source();
+    }
+}
diff --git a/src/keret-controller/src/mode.rs b/src/keret-controller/src/mode.rs
new file mode 100644
index 0000000..20be7a2
--- /dev/null
+++ b/src/keret-controller/src/mode.rs
@@ -0,0 +1,56 @@
+use tiny_led_matrix::Render;
+
+type Instant = u64;
+
+#[derive(Debug, Copy, Clone, Default)]
+pub(crate) enum AppMode {
+    #[default]
+    Idle,
+    Running(Instant),
+    Sending,
+    Error
+}
+
+impl Render for AppMode {
+    fn brightness_at(&self, x: usize, y: usize) -> u8 {
+        match self {
+            AppMode::Idle => IDLE_SPRITE[y][x],
+            AppMode::Running(_) => RUNNING_SPRITE[y][x],
+            AppMode::Sending => SENDING_SPRITE[y][x],
+            AppMode::Error => ERROR_SPRITE[y][x],
+        }
+    }
+}
+
+const IDLE_SPRITE: [[u8;5];5] = [
+    [5, 5, 0, 5, 5],
+    [5, 5, 0, 5, 5],
+    [5, 5, 0, 5, 5],
+    [5, 5, 0, 5, 5],
+    [5, 5, 0, 5, 5],
+];
+
+const RUNNING_SPRITE: [[u8;5];5] = [
+    [0, 5, 0, 0, 0],
+    [0, 5, 5, 0, 0],
+    [0, 5, 5, 5, 0],
+    [0, 5, 5, 0, 0],
+    [0, 5, 0, 0, 0],
+];
+
+const SENDING_SPRITE: [[u8;5];5] = [
+    [0, 0, 5, 0, 0],
+    [0, 5, 5, 5, 0],
+    [5, 0, 5, 0, 5],
+    [0, 0, 5, 0, 0],
+    [0, 0, 5, 0, 0],
+];
+
+
+const ERROR_SPRITE: [[u8;5];5] = [
+    [5, 5, 5, 5, 5],
+    [0, 5, 5, 5, 0],
+    [0, 0, 5, 0, 0],
+    [0, 0, 0, 0, 0],
+    [0, 0, 5, 0, 0],
+];
\ No newline at end of file
diff --git a/src/keret-controller/src/serialize.rs b/src/keret-controller/src/serialize.rs
new file mode 100644
index 0000000..efb140e
--- /dev/null
+++ b/src/keret-controller/src/serialize.rs
@@ -0,0 +1,14 @@
+use snafu::ResultExt;
+use keret_controller_transmit::{ActionReport};
+use crate::error::{Error, WritingToSerialPortFailedSnafu};
+
+pub(crate) fn serialize_message<T: microbit::hal::uarte::Instance>(serial: &mut microbit::hal::uarte::Uarte<T>, duration: u64) -> Result<(), Error> {
+    let report = ActionReport::new(duration);
+    let serialized_message = report.as_message();
+    serial.write(&serialized_message).context(WritingToSerialPortFailedSnafu)?;
+
+    let end_of_line = [b'\n'];
+    serial.write(&end_of_line).context(WritingToSerialPortFailedSnafu)?;
+
+    Ok(())
+}
diff --git a/src/keret-controller/src/time.rs b/src/keret-controller/src/time.rs
new file mode 100644
index 0000000..20de765
--- /dev/null
+++ b/src/keret-controller/src/time.rs
@@ -0,0 +1,27 @@
+use core::cell::RefCell;
+use cortex_m::interrupt::{free, Mutex};
+use microbit::hal::pac::SYST;
+
+static DISPLAY: Mutex<RefCell<Option<SYST>>> = Mutex::new(RefCell::new(None));
+
+pub(crate) fn init_time(mut board_syst: SYST) {
+    board_syst.set_reload(0x00ffffff);
+    board_syst.clear_current();
+    //board_syst.enable_interrupt();
+    board_syst.enable_counter();
+
+    free(move |cs| {
+        *DISPLAY.borrow(cs).borrow_mut() = Some(board_syst);
+    });
+}
+
+fn calc_now(period: u32, counter: u32) -> u64 {
+    ((period as u64) << 23) + ((counter ^ ((period & 1) << 23)) as u64)
+}
+
+pub(crate) fn now() -> u64 {
+    let p = 0_u32;
+    let v = SYST::get_current();
+
+    calc_now(p, v)
+}
diff --git a/src/keret-service-transmit/Cargo.toml b/src/keret-service-transmit/Cargo.toml
new file mode 100644
index 0000000..dd182e3
--- /dev/null
+++ b/src/keret-service-transmit/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "keret-service-transmit"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+serde = { version = "1.0.210", features = ["derive"] }
+chrono = { version = "0.4.38", features = ["serde"] }
\ No newline at end of file
diff --git a/src/keret-service-transmit/src/lib.rs b/src/keret-service-transmit/src/lib.rs
new file mode 100644
index 0000000..69c29de
--- /dev/null
+++ b/src/keret-service-transmit/src/lib.rs
@@ -0,0 +1,18 @@
+use std::time::{Duration};
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct ActionReport {
+    timestamp: DateTime<Utc>,
+    duration: Duration
+}
+
+impl From<u64> for ActionReport {
+    fn from(value: u64) -> Self {
+        Self {
+            timestamp: Utc::now(),
+            duration: Duration::from_micros(value)
+        }
+    }
+}
diff --git a/src/keret-service/Cargo.toml b/src/keret-service/Cargo.toml
new file mode 100644
index 0000000..fc80816
--- /dev/null
+++ b/src/keret-service/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "keret-service"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+axum = { version = "0.7.5" }
+serde = { version = "1.0", features = ["derive"] }
+serde_yaml = { version = "0.9.33" }
+tokio = { version = "1.0", features = ["full"] }
+tower = { version = "0.4", features = ["util", "timeout"] }
+tower-http = { version = "0.5.0", features = ["add-extension", "trace"] }
+tracing = { version = "0.1" }
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+snafu = { version = "0.8.4" }
+prometheus = { version = "0.13.4", features = ["process"] }
+lazy_static = "1.5.0"
+keret-service-transmit = {path = "../keret-service-transmit"}
\ No newline at end of file
diff --git a/src/keret-service/src/api/metrics.rs b/src/keret-service/src/api/metrics.rs
new file mode 100644
index 0000000..21f1025
--- /dev/null
+++ b/src/keret-service/src/api/metrics.rs
@@ -0,0 +1,41 @@
+use axum::http::StatusCode;
+use axum::response::IntoResponse;
+use lazy_static::lazy_static;
+use prometheus::Registry;
+use tracing::error;
+
+lazy_static! {
+    pub(crate) static ref REGISTRY: Registry = Registry::new();
+}
+
+pub(super) async fn metrics_handler() -> Result<impl IntoResponse, StatusCode> {
+    use prometheus::Encoder;
+    let encoder = prometheus::TextEncoder::new();
+
+    let mut buffer = Vec::new();
+    if let Err(e) = encoder.encode(&REGISTRY.gather(), &mut buffer) {
+        error!("could not encode custom metrics: {}", e);
+    };
+
+    let mut res = String::from_utf8(buffer.clone()).unwrap_or_else(|e| {
+        error!("custom metrics could not be from_utf8'd: {}", e);
+        String::default()
+    });
+
+    buffer.clear();
+
+    let mut buffer = Vec::new();
+    if let Err(e) = encoder.encode(&prometheus::gather(), &mut buffer) {
+        error!("could not encode prometheus metrics: {}", e);
+    };
+
+    let res_custom = String::from_utf8(buffer.clone()).unwrap_or_else(|e| {
+        error!("prometheus metrics could not be from_utf8'd: {}", e);
+        String::default()
+    });
+
+    buffer.clear();
+
+    res.push_str(&res_custom);
+    Ok(res)
+}
diff --git a/src/keret-service/src/api/mod.rs b/src/keret-service/src/api/mod.rs
new file mode 100644
index 0000000..314b614
--- /dev/null
+++ b/src/keret-service/src/api/mod.rs
@@ -0,0 +1,47 @@
+mod metrics;
+
+use axum::extract::{State};
+use axum::http::StatusCode;
+use axum::{Json, Router};
+use axum::response::IntoResponse;
+use axum::routing::get;
+use tracing::instrument;
+use keret_service_transmit::ActionReport;
+use crate::api::metrics::metrics_handler;
+use crate::repository::{ToDoRepository};
+
+pub(crate) fn setup_api<T: ToDoRepository + 'static>(repo: T) -> Router {
+    // build our application with a route
+    let todo_routes = Router::new()
+        .route("/", get(list_entries::<T>).post(add_entry::<T>))
+        .with_state(repo);
+
+    let app = Router::new()
+        .route("/metrics", get(metrics_handler))
+        .nest("/api/v1.0/report", todo_routes);
+    app
+}
+
+#[instrument(skip(repo))]
+async fn list_entries<T: ToDoRepository>(State(repo): State<T>) -> Result<impl IntoResponse, StatusCode> {
+    match repo.list() {
+        Ok(list) => {
+            Ok(Json(list))
+        }
+        Err(_) => {
+            Err(StatusCode::INTERNAL_SERVER_ERROR)
+        }
+    }
+}
+
+#[instrument(skip(repo))]
+async fn add_entry<T: ToDoRepository>(State(repo): State<T>, Json(entry): Json<ActionReport>) -> Result<impl IntoResponse, StatusCode> {
+    match repo.add(entry) {
+        Ok(index) => {
+            Ok(Json(index))
+        }
+        Err(_) => {
+            Err(StatusCode::INTERNAL_SERVER_ERROR)
+        }
+    }
+}
diff --git a/src/keret-service/src/main.rs b/src/keret-service/src/main.rs
new file mode 100644
index 0000000..c246ebf
--- /dev/null
+++ b/src/keret-service/src/main.rs
@@ -0,0 +1,28 @@
+use crate::api::setup_api;
+use crate::repository::{StorageBasedRepository, YamlRepositoryStorage};
+
+mod api;
+mod repository;
+
+const PORT : u16 = 3000;
+
+#[tokio::main]
+async fn main() {
+    // initialize tracing
+    tracing_subscriber::fmt::init();
+
+    let storage = YamlRepositoryStorage::new("repo.yaml");
+    let repo = StorageBasedRepository::new(storage);
+    let app = setup_api(repo);
+
+    // run our app with hyper, listening globally on port 3000
+    let Ok(listener) = tokio::net::TcpListener::bind(format!("0.0.0.0:{}", PORT)).await else {
+        eprintln!("Could not bind to port {}", PORT);
+        std::process::exit(-1);
+    };
+
+    if axum::serve(listener, app).await.is_err() {
+        eprintln!("Could you not start the API");
+        std::process::exit(-2);
+    };
+}
diff --git a/src/keret-service/src/repository/mod.rs b/src/keret-service/src/repository/mod.rs
new file mode 100644
index 0000000..3896d39
--- /dev/null
+++ b/src/keret-service/src/repository/mod.rs
@@ -0,0 +1,43 @@
+use std::backtrace::Backtrace;
+use snafu::Snafu;
+use keret_service_transmit::ActionReport;
+
+mod yaml_storage;
+mod storage_based_repo;
+
+pub(crate) use yaml_storage::YamlRepositoryStorage;
+pub(crate) use storage_based_repo::StorageBasedRepository;
+
+#[derive(Snafu, Debug)]
+#[snafu()]
+pub enum RepositoryError {
+    #[snafu(display("Can't open the repository file"))]
+    CantOpenRepository {
+        #[snafu(source(from(std::io::Error, Box::new)))]
+        source: Box<std::io::Error>
+    },
+    #[snafu(display("Deserialization of todos from repository failed"))]
+    DeserializationFailed {
+        #[snafu(source(from(serde_yaml::Error, Box::new)))]
+        source: Box<serde_yaml::Error>
+    },
+    #[snafu(display("Deserialization of todos into repository failed"))]
+    SerializationFailed {
+        #[snafu(source(from(serde_yaml::Error, Box::new)))]
+        source: Box<serde_yaml::Error>
+    },
+    #[snafu(display("Lock is poisoned, can't acquire"))]
+    LockPoisoned {
+        backtrace: Option<Backtrace>
+    },
+}
+
+pub(crate) trait RepositoryStorage {
+    fn list(&self) -> Result<Vec<ActionReport>, RepositoryError>;
+    fn store(&mut self, list: Vec<ActionReport>) -> Result<(), RepositoryError>;
+}
+
+pub(crate) trait ToDoRepository : Clone + Send + Sync {
+    fn list(&self) -> Result<Vec<ActionReport>, RepositoryError>;
+    fn add(&self, value: ActionReport) -> Result<usize, RepositoryError>;
+}
diff --git a/src/keret-service/src/repository/storage_based_repo.rs b/src/keret-service/src/repository/storage_based_repo.rs
new file mode 100644
index 0000000..8ba9f0b
--- /dev/null
+++ b/src/keret-service/src/repository/storage_based_repo.rs
@@ -0,0 +1,46 @@
+use std::sync::{Arc, RwLock};
+use tracing::instrument;
+use keret_service_transmit::ActionReport;
+use crate::repository::{LockPoisonedSnafu, RepositoryError, RepositoryStorage, ToDoRepository};
+
+#[derive(Clone)]
+pub(crate) struct StorageBasedRepository {
+    storage: Arc<RwLock<dyn RepositoryStorage + Send + Sync>>,
+}
+
+impl StorageBasedRepository {
+    pub(crate) fn new<T>(storage: T) -> Self
+    where
+        T: RepositoryStorage + Send + Sync + 'static
+    {
+        Self {
+            storage: Arc::new(RwLock::new(storage))
+        }
+    }
+}
+
+impl ToDoRepository for StorageBasedRepository {
+    #[instrument(skip(self))]
+    fn list(&self) -> Result<Vec<ActionReport>, RepositoryError> {
+        let Ok(repo) = self.storage.read() else {
+            return LockPoisonedSnafu.fail()
+        };
+
+        repo.list()
+    }
+
+    #[instrument(skip(self))]
+    fn add(&self, value: ActionReport) -> Result<usize, RepositoryError> {
+        let Ok(mut repo) = self.storage.write() else {
+            return LockPoisonedSnafu.fail()
+        };
+
+        let mut list = repo.list()?;
+
+        let new_index = list.len();
+        list.push(value);
+        repo.store(list)?;
+
+        Ok(new_index)
+    }
+}
diff --git a/src/keret-service/src/repository/yaml_storage.rs b/src/keret-service/src/repository/yaml_storage.rs
new file mode 100644
index 0000000..4840eda
--- /dev/null
+++ b/src/keret-service/src/repository/yaml_storage.rs
@@ -0,0 +1,39 @@
+use snafu::ResultExt;
+use tracing::instrument;
+use keret_service_transmit::ActionReport;
+use crate::repository::{CantOpenRepositorySnafu, DeserializationFailedSnafu, RepositoryError, RepositoryStorage, SerializationFailedSnafu};
+
+#[derive(Debug)]
+pub(crate) struct YamlRepositoryStorage {
+    filename: String,
+}
+
+impl YamlRepositoryStorage {
+    pub(crate) fn new(filename: impl Into<String>) -> Self {
+        Self {
+            filename: filename.into()
+        }
+    }
+}
+
+impl RepositoryStorage for YamlRepositoryStorage {
+    #[instrument(skip(self))]
+    fn list(&self) -> Result<Vec<ActionReport>, RepositoryError> {
+        if std::fs::metadata(&self.filename).is_err() {
+            return Ok(vec![])
+        }
+
+        let file = std::fs::File::open(&self.filename).context(CantOpenRepositorySnafu)?;
+        let content = serde_yaml::from_reader(file).context(DeserializationFailedSnafu)?;
+
+        Ok(content)
+    }
+
+    #[instrument(skip(self))]
+    fn store(&mut self, list: Vec<ActionReport>) -> Result<(), RepositoryError> {
+        let file = std::fs::File::create(&self.filename).context(CantOpenRepositorySnafu)?;
+        serde_yaml::to_writer(file, &list).context(SerializationFailedSnafu)?;
+
+        Ok(())
+    }
+}