diff --git a/Cargo.lock b/Cargo.lock
index 313ceb3..e08c6b5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -432,6 +432,7 @@ dependencies = [
  "reqwest",
  "serde",
  "serde_json",
+ "thiserror",
  "tokio",
  "tracing",
  "tracing-error",
diff --git a/Cargo.toml b/Cargo.toml
index 94322fa..c63cf21 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,6 +15,7 @@ html-escape = "0.2.11"
 reqwest = { version = "0.11.10", features = ["blocking", "json"] }
 serde = { version = "1.0.136", features = ["derive"] }
 serde_json = "1.0.79"
+thiserror = "1.0.30"
 tokio = { version = "1.17.0", features = ["full"] }
 tracing = "0.1.32"
 tracing-error = "0.2.0"
diff --git a/src/homeassistant.rs b/src/homeassistant.rs
index 795a637..da4577c 100644
--- a/src/homeassistant.rs
+++ b/src/homeassistant.rs
@@ -1,16 +1,82 @@
+use std::fmt::Display;
+
 use async_tungstenite::{tokio::connect_async, tungstenite};
-use color_eyre::{eyre::eyre, Result};
+use color_eyre::{eyre::bail, Result};
 use futures::{SinkExt, StreamExt};
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
+use thiserror::Error;
 use tracing::{debug, error, trace};
 
+use crate::output::{i3blocks::I3Blocks, waybar::Waybar, OutputFormat};
+
+#[derive(Debug, Error)]
+pub enum HomeAssistantError {
+    #[error("empty message received")]
+    EmptyMessage,
+    #[error("unhandled message {0}")]
+    UnhandledMessage(String),
+    #[error("error deserializing message: {0}")]
+    JsonError(#[from] serde_json::Error),
+}
+
+#[derive(Debug, Default)]
+pub(crate) struct HomeAssistantBuilder {
+    host: Option<String>,
+    entity: Option<String>,
+    token: Option<String>,
+    insecure: bool,
+    format: OutputFormat,
+}
+
+impl HomeAssistantBuilder {
+    pub(crate) fn new() -> Self {
+        Self::default()
+    }
+
+    pub(crate) fn host(mut self, host: String) -> Self {
+        self.host = Some(host);
+        self
+    }
+
+    pub(crate) fn entity(mut self, entity: String) -> Self {
+        self.entity = Some(entity);
+        self
+    }
+
+    pub(crate) fn token(mut self, token: String) -> Self {
+        self.token = Some(token);
+        self
+    }
+
+    pub(crate) fn insecure(mut self, insecure: bool) -> Self {
+        self.insecure = insecure;
+        self
+    }
+
+    pub(crate) fn format(mut self, format: OutputFormat) -> Self {
+        self.format = format;
+        self
+    }
+
+    pub(crate) fn build(self) -> HomeAssistant {
+        HomeAssistant::new(
+            self.host.unwrap(),
+            self.entity.unwrap(),
+            self.insecure,
+            self.token.unwrap(),
+            self.format,
+        )
+    }
+}
+
 pub(crate) struct HomeAssistant {
     token: String,
     entity: String,
     insecure: bool,
     host: String,
     id: u64,
+    format: OutputFormat,
 }
 
 #[derive(Debug, Default, Clone, Serialize, Deserialize)]
@@ -97,6 +163,33 @@ impl Default for MessageType {
     }
 }
 
+impl Display for MessageType {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            MessageType::AuthRequired => write!(f, "AuthRequired"),
+            MessageType::Auth => write!(f, "Auth"),
+            MessageType::AuthOk => write!(f, "AuthOk"),
+            MessageType::AuthInvalid => write!(f, "AuthInvalid"),
+            MessageType::Result => write!(f, "Result"),
+            MessageType::SubscribeEvents => write!(f, "SubscribeEvents"),
+            MessageType::Event => write!(f, "Event"),
+            MessageType::SubscribeTrigger => write!(f, "SubscribeTrigger"),
+            MessageType::UnsubscribeEvents => write!(f, "UnsubscribeEvents"),
+            MessageType::FireEvent => write!(f, "FireEvent"),
+            MessageType::CallService => write!(f, "CallService"),
+            MessageType::GetStates => write!(f, "GetStates"),
+            MessageType::GetConfig => write!(f, "GetConfig"),
+            MessageType::GetServices => write!(f, "GetServices"),
+            MessageType::GetPanels => write!(f, "GetPanels"),
+            MessageType::CameraThumbnail => write!(f, "CameraThumbnail"),
+            MessageType::MediaPlayerThumbnail => write!(f, "MediaPlayerThumbnail"),
+            MessageType::Ping => write!(f, "Ping"),
+            MessageType::Pong => write!(f, "Pong"),
+            MessageType::ValidateConfig => write!(f, "ValidateConfig"),
+        }
+    }
+}
+
 impl Message {
     fn auth() -> Self {
         let mut msg = Self::default();
@@ -126,16 +219,27 @@ impl Message {
 }
 
 impl HomeAssistant {
-    pub(crate) fn new(host: String, entity: String, insecure: bool, token: String) -> Self {
+    pub(crate) fn new(
+        host: String,
+        entity: String,
+        insecure: bool,
+        token: String,
+        format: OutputFormat,
+    ) -> Self {
         Self {
             token,
             entity,
             insecure,
             host,
+            format,
             id: 1,
         }
     }
 
+    pub(crate) fn builder() -> HomeAssistantBuilder {
+        HomeAssistantBuilder::new()
+    }
+
     fn incrementing_id(&mut self) -> u64 {
         let id = self.id;
         self.id = self.id.wrapping_add(1);
@@ -163,22 +267,34 @@ impl HomeAssistant {
                     }
                 }
                 Err(e) => {
-                    error!("{e}");
+                    if let Some(err) = e.downcast_ref::<HomeAssistantError>() {
+                        match err {
+                            HomeAssistantError::EmptyMessage => {
+                                debug!("Received empty message, ignoring...")
+                            }
+                            HomeAssistantError::UnhandledMessage(message_type) => debug!(
+                                "Received '{message_type}', we're currently not handling that."
+                            ),
+                            HomeAssistantError::JsonError(e) => error!("{e}"),
+                        }
+                    } else {
+                        error!("{e}");
+                    }
                 }
             }
         }
 
-        Err(eyre!(
-            "TODO: Connect to {} and subscribe to {}",
-            api_url,
-            self.entity
-        ))
+        Ok(())
     }
 
     async fn handle_message(
         &mut self,
         msg: tungstenite::Message,
     ) -> Result<Vec<tungstenite::Message>> {
+        if msg.len() == 0 {
+            bail!(HomeAssistantError::EmptyMessage);
+        }
+
         trace!("{}", msg.clone().into_text()?);
         let message: Message = serde_json::from_slice(&msg.into_data())?;
         trace!("Received: {message:?}");
@@ -205,22 +321,26 @@ impl HomeAssistant {
                 let event = message.event.unwrap();
 
                 if event.data.new_state.entity_id == self.entity {
-                    Self::print_state(event.data.new_state.state, event.data.new_state.attributes);
+                    let output = self
+                        .format_state(event.data.new_state.state, event.data.new_state.attributes);
+                    println!("{output}");
                 }
 
                 vec![]
             }
             MessageType::Result => {
-                debug!("{}", message.to_json());
+                trace!("{}", message.to_json());
 
                 vec![]
             }
-            _ => return Err(eyre!("TODO: Handle {:?}", message.message_type)),
+            _ => bail!(HomeAssistantError::UnhandledMessage(
+                message.message_type.to_string()
+            )),
         };
         Ok(response)
     }
 
-    fn print_state(state: String, attributes: Value) {
+    fn format_state(&self, state: String, attributes: Value) -> String {
         if state == "playing" {
             let maybe_channel = attributes["media_channel"].as_str();
             let artist = attributes["media_artist"].as_str().unwrap_or("No artist");
@@ -242,9 +362,28 @@ impl HomeAssistant {
                 format!("{volume}{artist} - {title}")
             };
 
-            println!("{}", html_escape::encode_text(&now_playing));
+            let text = html_escape::encode_text(&now_playing).to_string();
+
+            match self.format {
+                OutputFormat::Waybar => Waybar::builder()
+                    .text(text)
+                    .percentage((volume_raw * 100.) as u8)
+                    .build()
+                    .to_string(),
+                OutputFormat::I3Blocks => I3Blocks::builder().text(text).build().to_string(),
+            }
         } else {
-            println!("Sonos {state}");
+            // println!("Sonos {state}");
+            match self.format {
+                OutputFormat::Waybar => Waybar::builder()
+                    .text(format!("Sonos {state}"))
+                    .build()
+                    .to_string(),
+                OutputFormat::I3Blocks => I3Blocks::builder()
+                    .text(format!("Sonos {state}"))
+                    .build()
+                    .to_string(),
+            }
         }
     }
 }
diff --git a/src/main.rs b/src/main.rs
index 385651a..de362f0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -37,6 +37,10 @@ struct Opts {
     #[clap(short, long)]
     insecure: bool,
 
+    /// Output format
+    #[clap(arg_enum, short, long, default_value = "waybar")]
+    format: output::OutputFormat,
+
     #[clap(short, long)]
     debug: bool,
 
@@ -79,6 +83,7 @@ async fn main() -> Result<()> {
         cmd,
         token,
         token_file,
+        format,
     } = opts;
 
     setup(debug).wrap_err("Setup failed")?;
@@ -106,9 +111,13 @@ async fn main() -> Result<()> {
                 .wrap_err_with(|| format!("Unable to execute command {cmd}"))?;
         } else {
             debug!("Retrieving state of '{entity}' on '{host}'");
-            // get_now_playing(host, entity, insecure, token)
-            //     .wrap_err("Unable to retrieve now playing info")?;
-            let ha = homeassistant::HomeAssistant::new(host, entity, insecure, token);
+            let ha = homeassistant::HomeAssistant::builder()
+                .host(host)
+                .entity(entity)
+                .token(token)
+                .insecure(insecure)
+                .format(format)
+                .build();
             ha.open_connection().await.unwrap();
         }
     }
diff --git a/src/output/i3blocks.rs b/src/output/i3blocks.rs
new file mode 100644
index 0000000..eff727b
--- /dev/null
+++ b/src/output/i3blocks.rs
@@ -0,0 +1,55 @@
+use std::fmt::Display;
+
+#[derive(Debug, Default)]
+pub(crate) struct I3BlocksBuilder {
+    text: String,
+    tooltip: String,
+    class: String,
+}
+
+impl I3BlocksBuilder {
+    pub(crate) fn new() -> Self {
+        Self::default()
+    }
+
+    pub(crate) fn text(mut self, text: String) -> Self {
+        self.text = text;
+        self
+    }
+
+    pub(crate) fn tooltip(mut self, tooltip: String) -> Self {
+        self.tooltip = tooltip;
+        self
+    }
+
+    pub(crate) fn class(mut self, class: String) -> Self {
+        self.class = class;
+        self
+    }
+
+    pub(crate) fn build(self) -> I3Blocks {
+        I3Blocks {
+            text: self.text,
+            tooltip: self.tooltip,
+            class: self.class,
+        }
+    }
+}
+
+pub(crate) struct I3Blocks {
+    text: String,
+    tooltip: String,
+    class: String,
+}
+
+impl I3Blocks {
+    pub(crate) fn builder() -> I3BlocksBuilder {
+        I3BlocksBuilder::new()
+    }
+}
+
+impl Display for I3Blocks {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}\n{}\n{}", self.text, self.tooltip, self.class)
+    }
+}
diff --git a/src/output/mod.rs b/src/output/mod.rs
new file mode 100644
index 0000000..8224298
--- /dev/null
+++ b/src/output/mod.rs
@@ -0,0 +1,27 @@
+use std::fmt::Display;
+
+use clap::ArgEnum;
+
+pub(crate) mod i3blocks;
+pub(crate) mod waybar;
+
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, ArgEnum)]
+pub(crate) enum OutputFormat {
+    Waybar,
+    I3Blocks,
+}
+
+impl Display for OutputFormat {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            OutputFormat::Waybar => write!(f, "waybar format"),
+            OutputFormat::I3Blocks => write!(f, "i3blocks format"),
+        }
+    }
+}
+
+impl Default for OutputFormat {
+    fn default() -> Self {
+        Self::Waybar
+    }
+}
diff --git a/src/output/waybar.rs b/src/output/waybar.rs
new file mode 100644
index 0000000..a488044
--- /dev/null
+++ b/src/output/waybar.rs
@@ -0,0 +1,80 @@
+// {"text": "$text", "alt": "$alt", "tooltip": "$tooltip", "class": "$class", "percentage": $percentage }
+
+use std::fmt::Display;
+
+use serde::Serialize;
+
+#[derive(Debug, Default)]
+pub(crate) struct WaybarBuilder {
+    text: String,
+    alt: String,
+    tooltip: String,
+    class: String,
+    percentage: u8,
+}
+
+impl WaybarBuilder {
+    pub(crate) fn new() -> Self {
+        Self::default()
+    }
+
+    pub(crate) fn text(mut self, text: String) -> Self {
+        self.text = text;
+        self
+    }
+
+    pub(crate) fn alt(mut self, alt: String) -> Self {
+        self.alt = alt;
+        self
+    }
+
+    pub(crate) fn tooltip(mut self, tooltip: String) -> Self {
+        self.tooltip = tooltip;
+        self
+    }
+
+    pub(crate) fn class(mut self, class: String) -> Self {
+        self.class = class;
+        self
+    }
+
+    pub(crate) fn percentage(mut self, percentage: u8) -> Self {
+        self.percentage = percentage.clamp(0, 100);
+        self
+    }
+
+    pub(crate) fn build(self) -> Waybar {
+        Waybar {
+            text: self.text,
+            alt: self.alt,
+            tooltip: self.tooltip,
+            class: self.class,
+            percentage: self.percentage,
+        }
+    }
+}
+
+#[derive(Debug, Default, Serialize)]
+pub(crate) struct Waybar {
+    text: String,
+    alt: String,
+    tooltip: String,
+    class: String,
+    percentage: u8,
+}
+
+impl Waybar {
+    pub(crate) fn builder() -> WaybarBuilder {
+        WaybarBuilder::new()
+    }
+}
+
+impl Display for Waybar {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        if let Ok(out) = serde_json::to_string(self) {
+            write!(f, "{out}")
+        } else {
+            write!(f, "Unable to serialize to JSON: {self:?}")
+        }
+    }
+}