diff --git a/fan-controller/build.rs b/fan-controller/build.rs
index aaa840d..c7328a4 100644
--- a/fan-controller/build.rs
+++ b/fan-controller/build.rs
@@ -51,6 +51,10 @@ fn ensure_memory_x_file() -> Result<(), BuildError> {
 fn setup_wifi_credentials() -> Result<(), BuildError> {
     const WIFI_NETWORK: &str = "FAN_CONTROL_WIFI_NETWORK";
     const WIFI_PASSWORD: &str = "FAN_CONTROL_WIFI_PASSWORD";
+    const MQTT_BROKER_USERNAME: &str = "FAN_CONTROL_MQTT_BROKER_USERNAME";
+    const MQTT_BROKER_PASSWORD: &str = "FAN_CONTROL_MQTT_BROKER_PASSWORD";
+    const MQTT_BROKER_ADDRESS: &str = "FAN_CONTROL_MQTT_BROKER_ADDRESS";
+    const MQTT_BROKER_PORT: &str = "FAN_CONTROL_MQTT_BROKER_PORT";
 
     dotenvy::dotenv()?;
     let wifi_network =
@@ -58,8 +62,21 @@ fn setup_wifi_credentials() -> Result<(), BuildError> {
     let wifi_password =
         env::var(WIFI_PASSWORD).map_err(|error| BuildError::MissingEnvVar(error, WIFI_PASSWORD))?;
 
+    let mqtt_broker_username = env::var(MQTT_BROKER_USERNAME)
+        .map_err(|error| BuildError::MissingEnvVar(error, MQTT_BROKER_USERNAME))?;
+    let mqtt_broker_password = env::var(MQTT_BROKER_PASSWORD)
+        .map_err(|error| BuildError::MissingEnvVar(error, MQTT_BROKER_PASSWORD))?;
+    let mqtt_broker_address = env::var(MQTT_BROKER_ADDRESS)
+        .map_err(|error| BuildError::MissingEnvVar(error, MQTT_BROKER_ADDRESS))?;
+    let mqtt_broker_port = env::var(MQTT_BROKER_PORT)
+        .map_err(|error| BuildError::MissingEnvVar(error, MQTT_BROKER_PORT))?;
+
     println!("cargo:rustc-env=FAN_CONTROL_WIFI_NETWORK={wifi_network}");
     println!("cargo:rustc-env=FAN_CONTROL_WIFI_PASSWORD={wifi_password}");
+    println!("cargo:rustc-env=FAN_CONTROL_MQTT_BROKER_USERNAME={mqtt_broker_username}");
+    println!("cargo:rustc-env=FAN_CONTROL_MQTT_BROKER_PASSWORD={mqtt_broker_password}");
+    println!("cargo:rustc-env=FAN_CONTROL_MQTT_BROKER_ADDRESS={mqtt_broker_address}");
+    println!("cargo:rustc-env=FAN_CONTROL_MQTT_BROKER_PORT={mqtt_broker_port}");
 
     Ok(())
 }
diff --git a/fan-controller/src/configuration.rs b/fan-controller/src/configuration.rs
index f3162c4..9e4edb5 100644
--- a/fan-controller/src/configuration.rs
+++ b/fan-controller/src/configuration.rs
@@ -1,6 +1,25 @@
 use embassy_net::IpAddress;
 use embassy_time::Duration;
 
+/// Thanks!
+/// - https://users.rust-lang.org/t/pass-numeric-compile-time-arguments/59093/2
+/// - https://www.reddit.com/r/rust/comments/10ol38k/comment/j6jrpvd
+const fn parse_u16(string: &str) -> u16 {
+    let mut out: u16 = 0;
+    let mut index: usize = 0;
+    while index < string.len() {
+        out *= 10;
+        let byte = string.as_bytes()[index];
+        assert!(
+            b'0' <= byte && byte <= b'9',
+            "invalid digit. Needs to be a number",
+        );
+        out += (byte - b'0') as u16;
+        index += 1;
+    }
+    out
+}
+
 //TODO make configurable
 /// Don't put credentials in the source code
 pub(crate) const WIFI_NETWORK: &str = env!("FAN_CONTROL_WIFI_NETWORK");
@@ -10,10 +29,10 @@ pub(crate) const WIFI_NETWORK: &str = env!("FAN_CONTROL_WIFI_NETWORK");
 pub(crate) const WIFI_PASSWORD: &str = env!("FAN_CONTROL_WIFI_PASSWORD");
 
 //TODO make configurable
-pub(crate) const MQTT_BROKER_ADDRESS: &str = "homeassistant";
+pub(crate) const MQTT_BROKER_ADDRESS: &str = env!("FAN_CONTROL_MQTT_BROKER_ADDRESS");
 
 //TODO make configurable
-pub(crate) const MQTT_BROKER_PORT: u16 = 1883;
+pub(crate) const MQTT_BROKER_PORT: u16 = parse_u16(env!("FAN_CONTROL_MQTT_BROKER_PORT"));
 
 //TODO make configurable
 /// The broker IP address can be configured manually. It will be used instead of the [MQTT_BROKER_ADDRESS]
@@ -30,8 +49,8 @@ pub(crate) struct MqttBrokerCredentials<'a> {
 }
 
 pub(crate) const MQTT_BROKER_CREDENTIALS: MqttBrokerCredentials = MqttBrokerCredentials {
-    username: "fancontroller",
-    password: b"test",
+    username: env!("FAN_CONTROL_MQTT_BROKER_USERNAME"),
+    password: env!("FAN_CONTROL_MQTT_BROKER_PASSWORD").as_bytes(),
 };
 
 //TODO make configurable
diff --git a/fan-controller/src/main.rs b/fan-controller/src/main.rs
index 58ce5ea..82d41fe 100644
--- a/fan-controller/src/main.rs
+++ b/fan-controller/src/main.rs
@@ -1,7 +1,5 @@
 #![no_std]
 #![no_main]
-//TODO remove this 🥴
-#![allow(warnings)]
 
 use configuration::DISCOVERY_TOPIC;
 use core::convert::Infallible;