diff --git a/Cargo.lock b/Cargo.lock
index c77a4bb..eff3a2f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,21 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "android-tzdata"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e999941b234f3131b00bc13c22d06e8c5ff726d1b6318ac7eb276997bbb4fef0"
+
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "anstream"
 version = "0.6.15"
@@ -51,6 +66,12 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "autocfg"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26"
+
 [[package]]
 name = "bincode"
 version = "1.3.3"
@@ -60,6 +81,41 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "bumpalo"
+version = "3.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "79296716171880943b8470b5f8d03aa55eb2e645a4874bdbb28adb49162e012c"
+
+[[package]]
+name = "cc"
+version = "1.1.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c2e7962b54006dcfcc61cb72735f4d89bb97061dd6a7ed882ec6b8ee53714c6f"
+dependencies = [
+ "shlex",
+]
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "chrono"
+version = "0.4.38"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a21f936df1771bf62b77f047b726c4625ff2e8aa607c01ec06e5a05bd8463401"
+dependencies = [
+ "android-tzdata",
+ "iana-time-zone",
+ "js-sys",
+ "num-traits",
+ "wasm-bindgen",
+ "windows-targets",
+]
+
 [[package]]
 name = "clap"
 version = "4.5.16"
@@ -106,24 +162,83 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d3fd119d74b830634cea2a0f58bbd0d54540518a14397557951e79340abc28c0"
 
+[[package]]
+name = "core-foundation-sys"
+version = "0.8.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
+
 [[package]]
 name = "heck"
 version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
+[[package]]
+name = "iana-time-zone"
+version = "0.1.61"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "235e081f3925a06703c2d0117ea8b91f042756fd6e7a6e5d901e8ca1a996b220"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "wasm-bindgen",
+ "windows-core",
+]
+
+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f31827a206f56af32e590ba56d5d2d085f558508192593743f16b2306495269f"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "is_terminal_polyfill"
 version = "1.70.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7943c866cc5cd64cbc25b2e01621d07fa8eb2a1a23160ee81ce38704e97b8ecf"
 
+[[package]]
+name = "js-sys"
+version = "0.3.72"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a88f1bda2bd75b0452a14784937d796722fdebfe50df998aeb3f0b7603019a9"
+dependencies = [
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "libc"
 version = "0.2.158"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d8adc4bb1803a324070e64a98ae98f38934d91957a99cfb3a43dcbc01bc56439"
 
+[[package]]
+name = "log"
+version = "0.4.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a7a70ba024b9dc04c27ea2f0c0548feb474ec5c54bba33a7f72f873a39d07b24"
+
+[[package]]
+name = "num-traits"
+version = "0.2.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
+dependencies = [
+ "autocfg",
+]
+
+[[package]]
+name = "once_cell"
+version = "1.20.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1261fe7e33c73b354eab43b1273a57c8f967d0391e80353e51f764ac02cf6775"
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.86"
@@ -171,6 +286,12 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "shlex"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
+
 [[package]]
 name = "strsim"
 version = "0.11.1"
@@ -200,6 +321,70 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
 
+[[package]]
+name = "wasm-bindgen"
+version = "0.2.95"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "128d1e363af62632b8eb57219c8fd7877144af57558fb2ef0368d0087bddeb2e"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+ "wasm-bindgen-macro",
+]
+
+[[package]]
+name = "wasm-bindgen-backend"
+version = "0.2.95"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cb6dd4d3ca0ddffd1dd1c9c04f94b868c37ff5fac97c30b97cff2d74fce3a358"
+dependencies = [
+ "bumpalo",
+ "log",
+ "once_cell",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.95"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e79384be7f8f5a9dd5d7167216f022090cf1f9ec128e6e6a482a2cb5c5422c56"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.95"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "26c6ab57572f7a24a4985830b120de1594465e5d500f24afe89e16b4e833ef68"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.95"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "65fc09f10666a9f147042251e0dda9c18f166ff7de300607007e96bdebc1068d"
+
+[[package]]
+name = "windows-core"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "33ab640c8d7e35bf8ba19b884ba838ceb4fba93a4e8c65a9059d08afcfc683d9"
+dependencies = [
+ "windows-targets",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.52.0"
@@ -278,6 +463,7 @@ name = "zwote_sonne"
 version = "0.1.0"
 dependencies = [
  "bincode",
+ "chrono",
  "clap",
  "clap_derive",
  "rppal",
diff --git a/Cargo.toml b/Cargo.toml
index 1a55416..0c90235 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,6 +14,7 @@ path = "src/client.rs"
 
 [dependencies]
 bincode = "1.3.3"
+chrono = "0.4.38"
 clap = { version = "4.5.16", features = ["derive"] }
 clap_derive = "4.5.13"
 rppal = "0.19.0"
diff --git a/curve_description.adoc b/curve_description.adoc
new file mode 100644
index 0000000..d610ecd
--- /dev/null
+++ b/curve_description.adoc
@@ -0,0 +1,36 @@
+= Description of curves for light purposes
+Since the daily cycle is the main factor for plants whatever the periodicity of
+the curve it will be restarted at midnight local time.
+
+== Curve definition
+To keep it simple, we will only consider linear change.
+Because of this the light value can be described in required brightness at
+a given time. The value that the light had before that will then be adjusted
+smoothly, until it reaches the value intended at the next time point.
+The brightness at midnight must always be declared.
+
+For example: We want the light to be on off during the night, then turn on at
+6:00 in the morning with 20% and gradually increase in brightness until it
+reaches 100% at 8:00. Then, at 21:00 we want the light to start dimming until
+it turns off at 23:00. The following graph shows this:
+
+.Graph not yet available
+[%collapsible]
+====
+====
+
+The points should then be defined as follows:
+[source]
+----
+0000 0.0
+0600 0.0
+0600 0.2
+0800 1.0
+2100 1.0
+2300 0.0
+----
+
+You will notice that two entries are at the same time here. This will make sure
+that the light stays at the same level during the duration from 0000 to 0600.
+When multiple entries are at the same time, the furthest down will be chosen.
+
diff --git a/src/client.rs b/src/client.rs
index 0f987c9..603b63e 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -4,6 +4,7 @@ use clap::Parser;
 use clap_derive::Subcommand;
 use packet::Packet;
 
+pub mod military_time;
 mod packet;
 
 #[derive(Parser, Debug)]
@@ -17,47 +18,14 @@ struct Args
 }
 
 #[derive(Subcommand, Debug)]
-enum Command
-{
-	/// Set a constant brightness in Range 0.0..=1.0
-	Constant
-	{
-		brightness: f64
-	},
-	/// Sinusoidal curve with a period of 0.0.. seconds
-	Sine
-	{
-		period: f64
-	},
-	/// Triangle curve with a period of 0.0.. seconds
-	Triangle
-	{
-		period: f64
-	},
-	/// Sawtooth curve with a period of 0.0.. seconds
-	Sawtooth
-	{
-		period: f64
-	},
-	/// Square curve witha period of 0.0.. seconds and a duty cycle of 0.0..1.0
-	Square
-	{
-		period: f64, duty: f64
-	},
-}
+enum Command {}
 
 fn main()
 {
 	let args = Args::parse();
 	let mut stream = TcpStream::connect(args.connect).expect("Unable to connect to server");
 
-	let packet = match args.command {
-		Command::Constant { brightness } => Packet::Constant(brightness),
-		Command::Sine { period } => Packet::Sine(period),
-		Command::Triangle { period } => Packet::Triangle(period),
-		Command::Sawtooth { period } => Packet::Sawtooth(period),
-		Command::Square { period, duty } => Packet::Square { period, duty },
-	};
+	let packet = match args.command {};
 
 	packet
 		.write_to_stream(&mut stream)
diff --git a/src/military_time.rs b/src/military_time.rs
new file mode 100644
index 0000000..4b32e00
--- /dev/null
+++ b/src/military_time.rs
@@ -0,0 +1,76 @@
+use core::fmt;
+use std::str::FromStr;
+
+const NUM_CHARS: usize = 4;
+
+/// Time of day representation in military time.
+///
+/// Time does not know about anything fancy shmancy like timezones. Just useful
+/// for simple time of day comparisons.
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
+pub struct MilitaryTime(u16);
+
+#[derive(Debug)]
+pub struct WrongFormat;
+impl FromStr for MilitaryTime
+{
+	type Err = WrongFormat;
+
+	fn from_str(s: &str) -> Result<Self, Self::Err>
+	{
+		if s.len() != NUM_CHARS {
+			return Err(WrongFormat);
+		}
+
+		let time = u16::from_str(s).map_err(|_| Err(WrongFormat))?;
+		if time >= 2400 || (time % 100) >= 60 {
+			Err(WrongFormat)
+		}
+		else {
+			Ok(Self(time))
+		}
+	}
+}
+
+impl fmt::Display for MilitaryTime
+{
+	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { self.0.fmt(f) }
+}
+
+#[cfg(test)]
+mod test
+{
+	use std::str::FromStr;
+
+	use super::MilitaryTime;
+
+	#[test]
+	fn parse_valid()
+	{
+		let valid_times = ["0000", "1234", "2359", "2000"];
+
+		for t in valid_times {
+			let _mt = MilitaryTime::from_str(&t).expect("Failed to parse valid time");
+		}
+	}
+
+	#[test]
+	fn parse_wrong_len()
+	{
+		let times = ["", "1", "12", "123", "12345"];
+
+		for t in times {
+			let _err = MilitaryTime::from_str(&t).expect_err("Invalid time parsed");
+		}
+	}
+
+	#[test]
+	fn parse_invalid_times()
+	{
+		let times = ["-123", "0061", "2360", "2400", "-000", "060a"];
+
+		for t in times {
+			let _err = MilitaryTime::from_str(&t).expect_err("Invalid time parsed");
+		}
+	}
+}
diff --git a/src/packet.rs b/src/packet.rs
index b30c819..67c40ad 100644
--- a/src/packet.rs
+++ b/src/packet.rs
@@ -8,19 +8,12 @@ const MAX_PACKET_SIZE_BYTES: u64 = 1024;
 #[derive(Serialize, Deserialize)]
 pub enum Packet
 {
-	/// Constant brightness in range 0.0..1.0
-	Constant(f64),
-	/// Sinusoidal curve with a period of 0.0.. seconds
-	Sine(f64),
-	/// Triangle curve with a period of 0.0.. seconds
-	Triangle(f64),
-	/// Sawtooth curve with a period of 0.0.. seconds
-	Sawtooth(f64),
-	/// Square curve witha period of 0.0.. seconds and a duty cycle of 0.0..1.0
-	Square
-	{
-		period: f64, duty: f64
-	},
+	SetDefaultCurveFile(String),
+	GetDefaultCurveFile(String),
+	SetCurve(String),
+	SaveCurve(String),
+	Ok(String),
+	Err(String),
 }
 
 #[inline]
diff --git a/src/schedule.rs b/src/schedule.rs
new file mode 100644
index 0000000..20eac61
--- /dev/null
+++ b/src/schedule.rs
@@ -0,0 +1 @@
+pub struct Schedule {}
diff --git a/src/server.rs b/src/server.rs
index ef8dc28..1fb5d5c 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -37,6 +37,7 @@ enum LightMode
 	Triangle(f64),
 	Sawtooth(f64),
 	Square(f64, f64),
+	DaylightCycle(u32, u32),
 }
 impl LightMode
 {
@@ -50,6 +51,9 @@ impl LightMode
 			Self::Triangle(p) => triangle_wave(t / p),
 			Self::Sawtooth(p) => sawtooth_wave(t / p),
 			Self::Square(period, duty) => square_wave(t / period, *duty),
+			Self::DaylightCycle(day_start, night_start) => {
+				let night_after_day = night_start >= day_start;
+			},
 		}
 	}
 }
diff --git a/transfer.sh b/transfer.sh
new file mode 100644
index 0000000..ff26338
--- /dev/null
+++ b/transfer.sh
@@ -0,0 +1 @@
+scp target/debug/zwote_sonne kuchen:~/