internal data sources (clock, static text), connection indicator, rendering fixes

DataSourceConfig refactored to enum: External/Clock/StaticText. Clock
generates formatted time via chrono, static text emits configured string.

ESP32: connection status indicator (green/red dot bottom-right), per-widget
clear before redraw, RenderEvent enum for local + server messages.

Polling uses DataUpdate instead of ScreenUpdate to avoid wiping widget state.
Empty mappings passthrough raw source data for internal sources.

Cargo.lock

@@ -52,6 +52,15 @@ version = "0.2.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "683d7910e743518b0e34f1186f92494becacb047c7b6bf616c96772180fef923"
 
+[[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 = "anyhow"
 version = "1.0.102"
@@ -217,6 +226,8 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "application",
+ "chrono",
+ "chrono-tz",
  "config-sqlite",
  "domain",
  "dotenvy",
@@ -266,6 +277,29 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
 
+[[package]]
+name = "chrono"
+version = "0.4.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1aa79e62e7697b8e29b513a68abacf485adcd1fe8284a4316c5ae868e6633327"
+dependencies = [
+ "iana-time-zone",
+ "js-sys",
+ "num-traits",
+ "wasm-bindgen",
+ "windows-link",
+]
+
+[[package]]
+name = "chrono-tz"
+version = "0.10.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a6139a8597ed92cf816dfb33f5dd6cf0bb93a6adc938f11039f371bc5bcd26c3"
+dependencies = [
+ "chrono",
+ "phf",
+]
+
 [[package]]
 name = "cipher"
 version = "0.4.4"
@@ -974,6 +1008,30 @@ dependencies = [
  "windows-registry",
 ]
 
+[[package]]
+name = "iana-time-zone"
+version = "0.1.65"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e31bc9ad994ba00e440a8aa5c9ef0ec67d5cb5e5cb0cc7f8b744a35b389cc470"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "log",
+ "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 = "icu_collections"
 version = "2.2.0"
@@ -1502,6 +1560,24 @@ version = "2.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b4f627cb1b25917193a259e49bdad08f671f8d9708acfd5fe0a8c1455d87220"
 
+[[package]]
+name = "phf"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "913273894cec178f401a31ec4b656318d95473527be05c0752cc41cdc32be8b7"
+dependencies = [
+ "phf_shared",
+]
+
+[[package]]
+name = "phf_shared"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06005508882fb681fd97892ecff4b7fd0fee13ef1aa569f8695dae7ab9099981"
+dependencies = [
+ "siphasher",
+]
+
 [[package]]
 name = "pin-project-lite"
 version = "0.2.17"
@@ -2017,6 +2093,12 @@ dependencies = [
  "time",
 ]
 
+[[package]]
+name = "siphasher"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ee5873ec9cce0195efcb7a4e9507a04cd49aec9c83d0389df45b1ef7ba2e649"
+
 [[package]]
 name = "slab"
 version = "0.4.12"
@@ -2842,6 +2924,41 @@ dependencies = [
  "wasite",
 ]
 
+[[package]]
+name = "windows-core"
+version = "0.62.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8e83a14d34d0623b51dce9581199302a221863196a1dde71a7663a4c2be9deb"
+dependencies = [
+ "windows-implement",
+ "windows-interface",
+ "windows-link",
+ "windows-result",
+ "windows-strings",
+]
+
+[[package]]
+name = "windows-implement"
+version = "0.60.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "windows-interface"
+version = "0.59.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f316c4a2570ba26bbec722032c4099d8c8bc095efccdc15688708623367e358"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "windows-link"
 version = "0.2.1"

Cargo.toml

@@ -57,3 +57,5 @@ postcard = { version = "1.1", default-features = false, features = ["alloc"] }
 tokio = { version = "1.0", features = ["macros", "rt", "rt-multi-thread", "net", "sync", "time", "io-util"] }
 tower = "0.5"
 reqwest = { version = "0.12", features = ["json"] }
+chrono = "0.4"
+chrono-tz = "0.10"

crates/adapters/config-sqlite/src/serialization/data_source.rs

@@ -18,6 +18,8 @@ pub fn data_source_type_to_str(t: &DataSourceType) -> &'static str {
         DataSourceType::Rss => "rss",
         DataSourceType::HttpJson => "http_json",
         DataSourceType::Webhook => "webhook",
+        DataSourceType::Clock => "clock",
+        DataSourceType::StaticText => "static_text",
     }
 }
 
@@ -28,6 +30,8 @@ fn data_source_type_from_str(s: &str) -> Result<DataSourceType, SqliteConfigErro
         "rss" => Ok(DataSourceType::Rss),
         "http_json" => Ok(DataSourceType::HttpJson),
         "webhook" => Ok(DataSourceType::Webhook),
+        "clock" => Ok(DataSourceType::Clock),
+        "static_text" => Ok(DataSourceType::StaticText),
         _ => Err(SqliteConfigError::Serialization(format!(
             "unknown source type: {s}"
         ))),
@@ -38,13 +42,18 @@ pub fn data_source_config_to_json(
     config: &DataSourceConfig,
     secrets: Option<&(dyn SecretStore + Send + Sync)>,
 ) -> Result<String, SqliteConfigError> {
-    let api_key = config.api_key.as_ref().map(|k| match secrets {
+    let v = match config {
+        DataSourceConfig::External {
+            url,
+            headers,
+            api_key,
+        } => {
+            let api_key = api_key.as_ref().map(|k| match secrets {
                 Some(s) => s.encrypt(k),
                 None => k.clone(),
             });
 
-    let headers: Vec<(String, String)> = config
+            let headers: Vec<(String, String)> = headers
-        .headers
                 .iter()
                 .map(|(k, v)| {
                     let val = if is_sensitive_key(k) {
@@ -59,12 +68,28 @@ pub fn data_source_config_to_json(
                 })
                 .collect();
 
-    let v = serde_json::json!({
+            serde_json::json!({
-        "url": config.url,
+                "type": "external",
+                "url": url,
                 "headers": headers,
                 "api_key": api_key,
                 "encrypted": secrets.is_some(),
-    });
+            })
+        }
+        DataSourceConfig::Clock { format, timezone } => {
+            serde_json::json!({
+                "type": "clock",
+                "format": format,
+                "timezone": timezone,
+            })
+        }
+        DataSourceConfig::StaticText { text } => {
+            serde_json::json!({
+                "type": "static_text",
+                "text": text,
+            })
+        }
+    };
     serde_json::to_string(&v).map_err(|e| SqliteConfigError::Serialization(e.to_string()))
 }
 
@@ -75,8 +100,20 @@ fn data_source_config_from_json(
     let v: serde_json::Value =
         serde_json::from_str(json).map_err(|e| SqliteConfigError::Serialization(e.to_string()))?;
 
-    let encrypted = v["encrypted"].as_bool().unwrap_or(false);
+    let config_type = v["type"].as_str().unwrap_or("external");
 
+    match config_type {
+        "clock" => {
+            let format = v["format"].as_str().unwrap_or("%H:%M:%S").to_string();
+            let timezone = v["timezone"].as_str().unwrap_or("UTC").to_string();
+            Ok(DataSourceConfig::Clock { format, timezone })
+        }
+        "static_text" => {
+            let text = v["text"].as_str().unwrap_or("").to_string();
+            Ok(DataSourceConfig::StaticText { text })
+        }
+        _ => {
+            let encrypted = v["encrypted"].as_bool().unwrap_or(false);
             let url = v["url"].as_str().map(String::from);
 
             let api_key = v["api_key"].as_str().map(|k| {
@@ -111,12 +148,14 @@ fn data_source_config_from_json(
                 None => vec![],
             };
 
-    Ok(DataSourceConfig {
+            Ok(DataSourceConfig::External {
                 url,
                 headers,
                 api_key,
             })
         }
+    }
+}
 
 pub fn data_source_from_row(
     row: &SqliteRow,

crates/adapters/config-sqlite/tests/config_store_tests.rs

@@ -36,7 +36,7 @@ fn weather_source() -> DataSource {
         name: "openweather".into(),
         source_type: DataSourceType::Weather,
         poll_interval: Duration::from_secs(300),
-        config: DataSourceConfig {
+        config: DataSourceConfig::External {
             url: Some("https://api.openweather.org".into()),
             headers: vec![],
             api_key: Some("test-key".into()),
@@ -125,8 +125,13 @@ async fn save_and_retrieve_data_source() {
     assert_eq!(ds.name, "openweather");
     assert_eq!(ds.source_type, DataSourceType::Weather);
     assert_eq!(ds.poll_interval, Duration::from_secs(300));
-    assert_eq!(ds.config.url, Some("https://api.openweather.org".into()));
+    match &ds.config {
-    assert_eq!(ds.config.api_key, Some("test-key".into()));
+        DataSourceConfig::External { url, api_key, .. } => {
+            assert_eq!(*url, Some("https://api.openweather.org".into()));
+            assert_eq!(*api_key, Some("test-key".into()));
+        }
+        _ => panic!("expected External config"),
+    }
 }
 
 #[tokio::test]

crates/adapters/http-api/tests/api_tests.rs

@@ -171,9 +171,7 @@ async fn create_and_get_data_source() {
         "name": "weather_api",
         "source_type": "weather",
         "poll_interval_secs": 300,
-        "url": "https://api.openweather.org",
+        "config": {"type": "external", "url": "https://api.openweather.org", "api_key": "test-key", "headers": []}
-        "api_key": "test-key",
-        "headers": []
     }"#;
 
     let resp = app

crates/adapters/http-json/src/lib.rs

@@ -47,15 +47,23 @@ impl DataSourcePort for HttpJsonAdapter {
     type Error = HttpJsonError;
 
     async fn poll(&self, source: &DataSource) -> Result<Value, Self::Error> {
-        let url = source.config.url.as_ref().ok_or(HttpJsonError::NoUrl)?;
+        let domain::DataSourceConfig::External {
+            ref url,
+            ref headers,
+            ref api_key,
+        } = source.config
+        else {
+            return Err(HttpJsonError::NoUrl);
+        };
+        let url = url.as_ref().ok_or(HttpJsonError::NoUrl)?;
 
         let mut req = self.client.get(url);
 
-        for (key, val) in &source.config.headers {
+        for (key, val) in headers {
             req = req.header(key, val);
         }
 
-        if let Some(api_key) = &source.config.api_key {
+        if let Some(api_key) = api_key {
             req = req.header("Authorization", format!("Bearer {api_key}"));
         }
 

crates/adapters/http-json/tests/http_json_tests.rs

@@ -34,7 +34,7 @@ fn make_source(url: String) -> DataSource {
         name: "test".into(),
         source_type: DataSourceType::HttpJson,
         poll_interval: Duration::from_secs(60),
-        config: DataSourceConfig {
+        config: DataSourceConfig::External {
             url: Some(url),
             headers: vec![],
             api_key: None,
@@ -82,7 +82,7 @@ async fn returns_error_when_no_url() {
         name: "bad".into(),
         source_type: DataSourceType::HttpJson,
         poll_interval: Duration::from_secs(60),
-        config: DataSourceConfig {
+        config: DataSourceConfig::External {
             url: None,
             headers: vec![],
             api_key: None,

crates/adapters/media/src/lib.rs

@@ -38,11 +38,19 @@ impl DataSourcePort for MediaAdapter {
     type Error = MediaError;
 
     async fn poll(&self, source: &DataSource) -> Result<Value, Self::Error> {
-        let base_url = source.config.url.as_ref().ok_or(MediaError::NoUrl)?;
+        let domain::DataSourceConfig::External {
-        let username = find_header(&source.config.headers, "username")
+            ref url,
-            .ok_or(MediaError::MissingField("username"))?;
+            ref headers,
-        let password = find_header(&source.config.headers, "password")
+            ..
-            .ok_or(MediaError::MissingField("password"))?;
+        } = source.config
+        else {
+            return Err(MediaError::NoUrl);
+        };
+        let base_url = url.as_ref().ok_or(MediaError::NoUrl)?;
+        let username =
+            find_header(headers, "username").ok_or(MediaError::MissingField("username"))?;
+        let password =
+            find_header(headers, "password").ok_or(MediaError::MissingField("password"))?;
 
         let salt: String = (0..12).map(|_| fastrand::alphanumeric()).collect();
         let token = subsonic_token(password, &salt);

crates/adapters/media/tests/media_tests.rs

@@ -45,7 +45,7 @@ fn make_source(url: String) -> DataSource {
         name: "navidrome".into(),
         source_type: DataSourceType::Media,
         poll_interval: Duration::from_secs(5),
-        config: DataSourceConfig {
+        config: DataSourceConfig::External {
             url: Some(url),
             headers: vec![
                 ("username".into(), "test".into()),

crates/adapters/rss/src/lib.rs

@@ -28,7 +28,10 @@ impl DataSourcePort for RssAdapter {
     type Error = RssError;
 
     async fn poll(&self, source: &DataSource) -> Result<Value, Self::Error> {
-        let url = source.config.url.as_ref().ok_or(RssError::NoUrl)?;
+        let domain::DataSourceConfig::External { ref url, .. } = source.config else {
+            return Err(RssError::NoUrl);
+        };
+        let url = url.as_ref().ok_or(RssError::NoUrl)?;
 
         let resp = self
             .client

crates/api-types/src/data_source.rs

@@ -2,60 +2,128 @@ use domain::*;
 use serde::{Deserialize, Serialize};
 use std::time::Duration;
 
+#[derive(Serialize, Deserialize)]
+#[serde(tag = "type")]
+pub enum DataSourceConfigDto {
+    #[serde(rename = "external")]
+    External {
+        #[serde(default)]
+        url: Option<String>,
+        #[serde(default)]
+        api_key: Option<String>,
+        #[serde(default)]
+        headers: Vec<(String, String)>,
+    },
+    #[serde(rename = "clock")]
+    Clock {
+        #[serde(default = "default_clock_format")]
+        format: String,
+        #[serde(default = "default_timezone")]
+        timezone: String,
+    },
+    #[serde(rename = "static_text")]
+    StaticText {
+        #[serde(default)]
+        text: String,
+    },
+}
+
+fn default_clock_format() -> String {
+    "%H:%M:%S".into()
+}
+
+fn default_timezone() -> String {
+    "UTC".into()
+}
+
 #[derive(Serialize, Deserialize)]
 pub struct DataSourceDto {
     pub id: u16,
     pub name: String,
     pub source_type: String,
     pub poll_interval_secs: u64,
-    pub url: Option<String>,
+    pub config: DataSourceConfigDto,
-    pub api_key: Option<String>,
+}
-    pub headers: Vec<(String, String)>,
+
+fn source_type_to_str(t: &DataSourceType) -> &'static str {
+    match t {
+        DataSourceType::Weather => "weather",
+        DataSourceType::Media => "media",
+        DataSourceType::Rss => "rss",
+        DataSourceType::HttpJson => "http_json",
+        DataSourceType::Webhook => "webhook",
+        DataSourceType::Clock => "clock",
+        DataSourceType::StaticText => "static_text",
+    }
+}
+
+fn source_type_from_str(s: &str) -> Result<DataSourceType, String> {
+    match s {
+        "weather" => Ok(DataSourceType::Weather),
+        "media" => Ok(DataSourceType::Media),
+        "rss" => Ok(DataSourceType::Rss),
+        "http_json" => Ok(DataSourceType::HttpJson),
+        "webhook" => Ok(DataSourceType::Webhook),
+        "clock" => Ok(DataSourceType::Clock),
+        "static_text" => Ok(DataSourceType::StaticText),
+        t => Err(format!("unknown source_type: {t}")),
+    }
 }
 
 impl From<&DataSource> for DataSourceDto {
     fn from(ds: &DataSource) -> Self {
+        let config = match &ds.config {
+            DataSourceConfig::External {
+                url,
+                api_key,
+                headers,
+            } => DataSourceConfigDto::External {
+                url: url.clone(),
+                api_key: api_key.clone(),
+                headers: headers.clone(),
+            },
+            DataSourceConfig::Clock { format, timezone } => DataSourceConfigDto::Clock {
+                format: format.clone(),
+                timezone: timezone.clone(),
+            },
+            DataSourceConfig::StaticText { text } => {
+                DataSourceConfigDto::StaticText { text: text.clone() }
+            }
+        };
         Self {
             id: ds.id,
             name: ds.name.clone(),
-            source_type: match ds.source_type {
+            source_type: source_type_to_str(&ds.source_type).into(),
-                DataSourceType::Weather => "weather",
-                DataSourceType::Media => "media",
-
-                DataSourceType::Rss => "rss",
-                DataSourceType::HttpJson => "http_json",
-                DataSourceType::Webhook => "webhook",
-            }
-            .into(),
             poll_interval_secs: ds.poll_interval.as_secs(),
-            url: ds.config.url.clone(),
+            config,
-            api_key: ds.config.api_key.clone(),
-            headers: ds.config.headers.clone(),
         }
     }
 }
 
 impl DataSourceDto {
     pub fn into_domain(self) -> Result<DataSource, String> {
-        let source_type = match self.source_type.as_str() {
+        let source_type = source_type_from_str(&self.source_type)?;
-            "weather" => DataSourceType::Weather,
+        let config = match self.config {
-            "media" => DataSourceType::Media,
+            DataSourceConfigDto::External {
-
+                url,
-            "rss" => DataSourceType::Rss,
+                api_key,
-            "http_json" => DataSourceType::HttpJson,
+                headers,
-            "webhook" => DataSourceType::Webhook,
+            } => DataSourceConfig::External {
-            t => return Err(format!("unknown source_type: {t}")),
+                url,
+                api_key,
+                headers,
+            },
+            DataSourceConfigDto::Clock { format, timezone } => {
+                DataSourceConfig::Clock { format, timezone }
+            }
+            DataSourceConfigDto::StaticText { text } => DataSourceConfig::StaticText { text },
         };
         Ok(DataSource {
             id: self.id,
             name: self.name,
             source_type,
             poll_interval: Duration::from_secs(self.poll_interval_secs),
-            config: DataSourceConfig {
+            config,
-                url: self.url,
-                api_key: self.api_key,
-                headers: self.headers,
-            },
         })
     }
 }

crates/application/tests/config_service_tests.rs

@@ -47,7 +47,7 @@ async fn create_data_source_rejects_invalid() {
         name: "bad".into(),
         source_type: DataSourceType::HttpJson,
         poll_interval: Duration::from_secs(60),
-        config: DataSourceConfig {
+        config: DataSourceConfig::External {
             url: None,
             headers: vec![],
             api_key: None,
@@ -70,7 +70,7 @@ async fn create_data_source_persists_valid_and_emits_event() {
         name: "weather".into(),
         source_type: DataSourceType::Weather,
         poll_interval: Duration::from_secs(300),
-        config: DataSourceConfig {
+        config: DataSourceConfig::External {
             url: Some("https://api.weather.com".into()),
             headers: vec![],
             api_key: None,

crates/bootstrap/Cargo.toml

@@ -19,3 +19,5 @@ anyhow.workspace = true
 tracing.workspace = true
 tracing-subscriber.workspace = true
 dotenvy.workspace = true
+chrono.workspace = true
+chrono-tz.workspace = true

crates/bootstrap/src/polling.rs

@@ -1,13 +1,16 @@
 use anyhow::Result;
 use application::DataProjection;
+use chrono::Utc;
+use chrono_tz::Tz;
 use config_sqlite::SqliteConfigStore;
 use domain::{
-    BroadcastPort, ConfigRepository, DataSource, DataSourcePort, DataSourceType, Value, WidgetState,
+    BroadcastPort, ConfigRepository, DataSource, DataSourceConfig, DataSourcePort, DataSourceType,
+    Value, WidgetState,
 };
 use http_json::HttpJsonAdapter;
 use media_adapter::MediaAdapter;
 use rss_adapter::RssAdapter;
-use std::collections::HashMap;
+use std::collections::{BTreeMap, HashMap};
 use std::sync::Arc;
 use std::time::Duration;
 use tcp_server::TcpBroadcaster;
@@ -117,14 +120,6 @@ async fn poll_loop(
             }
         };
 
-        let layout = match config.get_layout().await {
-            Ok(l) => l,
-            Err(e) => {
-                warn!(error = %e, "failed to fetch layout");
-                continue;
-            }
-        };
-
         let changed: Vec<(u16, WidgetState)> = projection
             .apply_poll_result(source.id, &result, &widgets)
             .await;
@@ -137,9 +132,7 @@ async fn poll_loop(
                     Some((*id, hint, state.clone()))
                 })
                 .collect();
-            if let Some(l) = &layout
+            if let Err(e) = broadcaster.push_data_update(&with_hints).await {
-                && let Err(e) = broadcaster.push_screen_update(l, &with_hints).await
-            {
                 warn!(error = %e, "failed to push update");
             }
             info!(source = %source.name, count = changed.len(), "pushed widget updates");
@@ -166,8 +159,33 @@ async fn poll_source(
             .poll(source)
             .await
             .map_err(|e| anyhow::anyhow!("{e}")),
+        DataSourceType::Clock => Ok(generate_clock(&source.config)),
+        DataSourceType::StaticText => Ok(generate_static_text(&source.config)),
         DataSourceType::Webhook => Err(anyhow::anyhow!(
             "webhook sources are push-based, not polled"
         )),
     }
 }
+
+fn generate_clock(config: &DataSourceConfig) -> Value {
+    let (fmt, tz_name) = match config {
+        DataSourceConfig::Clock { format, timezone } => (format.as_str(), timezone.as_str()),
+        _ => ("%H:%M:%S", "UTC"),
+    };
+    let tz: Tz = tz_name.parse().unwrap_or(chrono_tz::UTC);
+    let now = Utc::now().with_timezone(&tz);
+    let formatted = now.format(fmt).to_string();
+    let mut map = BTreeMap::new();
+    map.insert("time".into(), Value::String(formatted));
+    Value::Object(map)
+}
+
+fn generate_static_text(config: &DataSourceConfig) -> Value {
+    let text = match config {
+        DataSourceConfig::StaticText { text } => text.clone(),
+        _ => String::new(),
+    };
+    let mut map = BTreeMap::new();
+    map.insert("text".into(), Value::String(text));
+    Value::Object(map)
+}

crates/client-esp32/src/adapters/display.rs

@@ -3,7 +3,7 @@ use embedded_graphics::{
     mono_font::{ascii::FONT_6X10, ascii::FONT_10X20, MonoTextStyle},
     pixelcolor::Rgb565,
     prelude::*,
-    primitives::{PrimitiveStyle, Rectangle},
+    primitives::{Circle, PrimitiveStyle, Rectangle},
     text::Text,
 };
 
@@ -27,6 +27,7 @@ pub struct Esp32DisplayAdapter {
 trait ErasedDisplay {
     fn draw_text_span(&mut self, text: &str, x: u16, y: u16, color: Rgb565, font: FontSize) -> Result<(), DisplayError>;
     fn fill_rect(&mut self, bounds: BoundingBox, color: Rgb565) -> Result<(), DisplayError>;
+    fn fill_circle(&mut self, x: u16, y: u16, diameter: u16, color: Rgb565) -> Result<(), DisplayError>;
     fn flush(&mut self) -> Result<(), DisplayError>;
 }
 
@@ -57,6 +58,14 @@ where
         Ok(())
     }
 
+    fn fill_circle(&mut self, x: u16, y: u16, diameter: u16, color: Rgb565) -> Result<(), DisplayError> {
+        Circle::new(Point::new(x as i32, y as i32), diameter as u32)
+            .into_styled(PrimitiveStyle::with_fill(color))
+            .draw(self)
+            .map_err(|e| DisplayError::Draw(format!("{e:?}")))?;
+        Ok(())
+    }
+
     fn flush(&mut self) -> Result<(), DisplayError> {
         Ok(())
     }
@@ -100,3 +109,9 @@ impl DisplayPort for Esp32DisplayAdapter {
         self.inner.flush()
     }
 }
+
+impl Esp32DisplayAdapter {
+    pub fn fill_circle(&mut self, x: u16, y: u16, diameter: u16, color: Color) -> Result<(), DisplayError> {
+        self.inner.fill_circle(x, y, diameter, to_rgb565(color))
+    }
+}

crates/client-esp32/src/main.rs

@@ -50,7 +50,7 @@ fn run_station(
     info!("Connecting WiFi...");
     match hal::wifi::init(modem, sysloop.clone(), nvs.clone(), &cfg.wifi_ssid, &cfg.wifi_pass) {
         Ok(_wifi) => {
-            let (tx, rx) = mpsc::channel();
+            let (tx, rx) = mpsc::channel::<tasks::RenderEvent>();
             tasks::network::spawn(cfg.server_addr, tx);
             tasks::render::run(config::SCREEN, display, rx);
         }

crates/client-esp32/src/tasks/mod.rs

@@ -1,2 +1,9 @@
 pub mod network;
 pub mod render;
+
+use protocol::ServerMessage;
+
+pub enum RenderEvent {
+    Server(ServerMessage),
+    ConnectionStatus(bool),
+}

crates/client-esp32/src/tasks/network.rs

@@ -1,12 +1,13 @@
 use std::sync::mpsc;
 use std::thread;
 use client_domain::NetworkPort;
-use protocol::{ServerMessage, decode_server_message};
+use protocol::decode_server_message;
+use super::RenderEvent;
 use crate::config::{NET_THREAD_STACK_SIZE, NET_POLL_INTERVAL, NET_RECONNECT_DELAY};
 use crate::adapters::network::Esp32Network;
 use log::*;
 
-pub fn spawn(server_addr: String, tx: mpsc::Sender<ServerMessage>) {
+pub fn spawn(server_addr: String, tx: mpsc::Sender<RenderEvent>) {
     thread::Builder::new()
         .stack_size(NET_THREAD_STACK_SIZE)
         .name("net".into())
@@ -14,16 +15,20 @@ pub fn spawn(server_addr: String, tx: mpsc::Sender<ServerMessage>) {
         .expect("failed to spawn network thread");
 }
 
-fn run(server_addr: String, tx: mpsc::Sender<ServerMessage>) {
+fn run(server_addr: String, tx: mpsc::Sender<RenderEvent>) {
     let mut net = Esp32Network::new();
 
     loop {
         if !net.is_connected() {
             info!("Connecting to server {server_addr}...");
             match net.connect(&server_addr) {
-                Ok(()) => info!("Server connected"),
+                Ok(()) => {
+                    info!("Server connected");
+                    let _ = tx.send(RenderEvent::ConnectionStatus(true));
+                }
                 Err(e) => {
                     error!("Connection failed: {e}, retrying...");
+                    let _ = tx.send(RenderEvent::ConnectionStatus(false));
                     thread::sleep(NET_RECONNECT_DELAY);
                     continue;
                 }
@@ -33,7 +38,7 @@ fn run(server_addr: String, tx: mpsc::Sender<ServerMessage>) {
         match net.receive() {
             Ok(Some(payload)) => {
                 match decode_server_message(&payload) {
-                    Ok(msg) => { let _ = tx.send(msg); }
+                    Ok(msg) => { let _ = tx.send(RenderEvent::Server(msg)); }
                     Err(e) => error!("Decode error: {e}"),
                 }
             }
@@ -43,6 +48,7 @@ fn run(server_addr: String, tx: mpsc::Sender<ServerMessage>) {
             Err(e) => {
                 error!("Receive error: {e}, reconnecting...");
                 let _ = net.disconnect();
+                let _ = tx.send(RenderEvent::ConnectionStatus(false));
                 thread::sleep(NET_RECONNECT_DELAY);
             }
         }

crates/client-esp32/src/tasks/render.rs

@@ -2,16 +2,21 @@ use std::sync::mpsc;
 use std::time::{Duration, Instant};
 use std::collections::HashMap;
 use client_domain::{
-    BoundingBox, DisplayPort, FontMetrics, RenderEngine, ScrollState, ThemeConfig,
+    BoundingBox, Color, DisplayPort, FontMetrics, RenderEngine, ScrollState, ThemeConfig,
 };
 use client_application::{ClientApp, RepaintCommand};
 use domain::{DisplayHint, Value};
 use protocol::ServerMessage;
+use super::RenderEvent;
 use crate::config::RENDER_POLL_INTERVAL;
 use crate::adapters::display::Esp32DisplayAdapter;
 use log::*;
 
 const SCROLL_TICK: Duration = Duration::from_millis(50);
+const INDICATOR_DIAMETER: u16 = 8;
+const INDICATOR_MARGIN: u16 = 4;
+const COLOR_CONNECTED: Color = Color(0, 200, 0);
+const COLOR_DISCONNECTED: Color = Color(200, 0, 0);
 
 struct WidgetCache {
     hint: DisplayHint,
@@ -23,7 +28,7 @@ struct WidgetCache {
 pub fn run(
     screen: BoundingBox,
     mut display: Esp32DisplayAdapter,
-    rx: mpsc::Receiver<ServerMessage>,
+    rx: mpsc::Receiver<RenderEvent>,
 ) {
     let metrics = FontMetrics {
         small: (6, 10),
@@ -34,13 +39,23 @@ pub fn run(
     let mut widgets: HashMap<u16, WidgetCache> = HashMap::new();
     let mut first_update = true;
     let mut last_tick = Instant::now();
+    let mut connected = false;
 
     info!("Render loop started");
+    draw_indicator(&mut display, screen, connected);
+    display.flush().unwrap();
 
     loop {
         let timeout = RENDER_POLL_INTERVAL.min(SCROLL_TICK);
         match rx.recv_timeout(timeout) {
-            Ok(msg) => {
+            Ok(RenderEvent::ConnectionStatus(status)) => {
+                if status != connected {
+                    connected = status;
+                    draw_indicator(&mut display, screen, connected);
+                    display.flush().unwrap();
+                }
+            }
+            Ok(RenderEvent::Server(msg)) => {
                 let is_screen_update = matches!(msg, ServerMessage::ScreenUpdate { .. });
                 let repaints = app.handle_message(msg);
 
@@ -49,19 +64,20 @@ pub fn run(
                     engine.set_theme(app.theme().clone());
                 }
 
-                if !repaints.is_empty() && (first_update || is_screen_update || theme_changed) {
                 let bg = engine.theme().background;
+                if !repaints.is_empty() && (first_update || is_screen_update || theme_changed) {
                     display.fill_rect(screen, bg).unwrap();
                     first_update = false;
                 }
-
                 for cmd in &repaints {
                     let cache = update_cache(&engine, cmd);
+                    display.fill_rect(cache.bounds, bg).unwrap();
                     draw_widget(&engine, &mut display, &cache);
                     widgets.insert(cmd.widget_id, cache);
                 }
 
                 if !repaints.is_empty() {
+                    draw_indicator(&mut display, screen, connected);
                     display.flush().unwrap();
                 }
             }
@@ -86,11 +102,19 @@ pub fn run(
             }
         }
         if needs_flush {
+            draw_indicator(&mut display, screen, connected);
             display.flush().unwrap();
         }
     }
 }
 
+fn draw_indicator(display: &mut Esp32DisplayAdapter, screen: BoundingBox, connected: bool) {
+    let color = if connected { COLOR_CONNECTED } else { COLOR_DISCONNECTED };
+    let x = screen.x + screen.width - INDICATOR_DIAMETER - INDICATOR_MARGIN;
+    let y = screen.y + screen.height - INDICATOR_DIAMETER - INDICATOR_MARGIN;
+    display.fill_circle(x, y, INDICATOR_DIAMETER, color).unwrap();
+}
+
 fn update_cache(engine: &RenderEngine, cmd: &RepaintCommand) -> WidgetCache {
     let hint: DisplayHint = cmd.display_hint.clone().into();
     let data: Vec<(String, Value)> = cmd.state.data

crates/domain/src/entities/data_source.rs

@@ -9,13 +9,24 @@ pub enum DataSourceType {
     Rss,
     HttpJson,
     Webhook,
+    Clock,
+    StaticText,
 }
 
 #[derive(Debug, Clone)]
-pub struct DataSourceConfig {
+pub enum DataSourceConfig {
-    pub url: Option<String>,
+    External {
-    pub headers: Vec<(String, String)>,
+        url: Option<String>,
-    pub api_key: Option<String>,
+        headers: Vec<(String, String)>,
+        api_key: Option<String>,
+    },
+    Clock {
+        format: String,
+        timezone: String,
+    },
+    StaticText {
+        text: String,
+    },
 }
 
 #[derive(Debug, Clone)]
@@ -38,20 +49,30 @@ impl DataSource {
     pub fn validate(&self) -> Vec<DataSourceValidationError> {
         let mut errors = Vec::new();
 
-        let is_webhook = self.source_type == DataSourceType::Webhook;
+        match self.source_type {
-
+            DataSourceType::Webhook => {
-        if is_webhook {
                 if !self.poll_interval.is_zero() {
                     errors.push(DataSourceValidationError::PollIntervalNotAllowed);
                 }
-        } else {
+            }
+            DataSourceType::Clock | DataSourceType::StaticText => {
+                // Internal sources: poll_interval optional, no url needed
+            }
+            _ => {
                 if self.poll_interval.is_zero() {
                     errors.push(DataSourceValidationError::PollIntervalRequired);
                 }
-            if self.requires_url() && self.config.url.is_none() {
+                if self.requires_url() {
+                    let has_url = matches!(
+                        &self.config,
+                        DataSourceConfig::External { url: Some(_), .. }
+                    );
+                    if !has_url {
                         errors.push(DataSourceValidationError::UrlRequired);
                     }
                 }
+            }
+        }
 
         errors
     }

crates/domain/src/entities/widget_config.rs

@@ -35,6 +35,15 @@ impl WidgetConfig {
     }
 
     pub fn extract(&self, raw: &Value) -> WidgetState {
+        let has_mappings = self.mappings.iter().any(|m| !m.source_path.is_empty());
+        if !has_mappings {
+            let data = match raw {
+                Value::Object(map) => map.clone(),
+                _ => BTreeMap::new(),
+            };
+            return WidgetState { data, error: None };
+        }
+
         let budget = self.max_data_size as usize;
         let mut used = 0usize;
         let mut data = BTreeMap::new();

crates/domain/tests/data_source_tests.rs

@@ -7,7 +7,7 @@ fn make_source(source_type: DataSourceType, url: Option<&str>, poll: Duration) -
         name: "test".into(),
         source_type,
         poll_interval: poll,
-        config: DataSourceConfig {
+        config: DataSourceConfig::External {
             url: url.map(Into::into),
             headers: vec![],
             api_key: None,

spa/src/api/types.ts

@@ -7,7 +7,7 @@ export interface DisplayHint {
   h_align: HAlign
   v_align: VAlign
 }
-export type SourceType = "weather" | "media" | "rss" | "http_json" | "webhook"
+export type SourceType = "weather" | "media" | "rss" | "http_json" | "webhook" | "clock" | "static_text"
 export type SizingType = "fixed" | "flex"
 export type Direction = "row" | "column"
 export type JustifyContent = "start" | "center" | "end" | "space_between" | "space_evenly"
@@ -29,14 +29,17 @@ export interface Widget {
 
 export type CreateWidget = Widget
 
+export type DataSourceConfig =
+  | { type: "external"; url: string | null; api_key: string | null; headers: [string, string][] }
+  | { type: "clock"; format: string; timezone: string }
+  | { type: "static_text"; text: string }
+
 export interface DataSource {
   id: number
   name: string
   source_type: SourceType
   poll_interval_secs: number
-  url: string | null
+  config: DataSourceConfig
-  api_key: string | null
-  headers: [string, string][]
 }
 
 export interface Sizing {

spa/src/pages/data-sources.tsx

@@ -5,7 +5,7 @@ import {
   useUpdateDataSource,
   useDeleteDataSource,
 } from "@/api/data-sources"
-import type { DataSource, SourceType } from "@/api/types"
+import type { DataSource, DataSourceConfig, SourceType } from "@/api/types"
 import { Button } from "@/components/ui/button"
 import {
   Card,
@@ -50,16 +50,24 @@ const SOURCE_TYPES: SourceType[] = [
   "rss",
   "http_json",
   "webhook",
+  "clock",
+  "static_text",
 ]
 
+const EXTERNAL_TYPES: SourceType[] = ["weather", "media", "rss", "http_json", "webhook"]
+
+function defaultConfigFor(sourceType: SourceType): DataSourceConfig {
+  if (sourceType === "clock") return { type: "clock", format: "%H:%M:%S", timezone: "UTC" }
+  if (sourceType === "static_text") return { type: "static_text", text: "" }
+  return { type: "external", url: null, api_key: null, headers: [] }
+}
+
 const EMPTY: DataSource = {
   id: 0,
   name: "",
   source_type: "http_json",
   poll_interval_secs: 300,
-  url: null,
+  config: { type: "external", url: null, api_key: null, headers: [] },
-  api_key: null,
-  headers: [],
 }
 
 export function DataSourcesPage() {
@@ -145,10 +153,10 @@ export function DataSourcesPage() {
                   <CardTitle className="text-base">{ds.name}</CardTitle>
                   <CardDescription className="flex items-center gap-2">
                     <Badge variant="secondary">{ds.source_type}</Badge>
-                    <span>every {ds.poll_interval_secs}s</span>
+                    {ds.poll_interval_secs > 0 && <span>every {ds.poll_interval_secs}s</span>}
-                    {ds.url && (
+                    {ds.config.type === "external" && ds.config.url && (
                       <span className="text-muted-foreground max-w-xs truncate text-xs">
-                        {ds.url}
+                        {ds.config.url}
                       </span>
                     )}
                   </CardDescription>
@@ -196,9 +204,13 @@ export function DataSourcesPage() {
               onClick={save}
               disabled={
                 !editing?.name ||
-                (editing.source_type !== "webhook" &&
+                (EXTERNAL_TYPES.includes(editing.source_type) &&
+                  editing.source_type !== "webhook" &&
                   editing.poll_interval_secs <= 0) ||
-                (editing.source_type !== "webhook" && !editing.url)
+                (EXTERNAL_TYPES.includes(editing.source_type) &&
+                  editing.source_type !== "webhook" &&
+                  editing.config.type === "external" &&
+                  !editing.config.url)
               }
             >
               Save
@@ -302,6 +314,17 @@ function DataSourceForm({
   const set = <K extends keyof DataSource>(k: K, v: DataSource[K]) =>
     onChange({ ...value, [k]: v })
 
+  const setConfig = (patch: Partial<DataSourceConfig>) =>
+    onChange({ ...value, config: { ...value.config, ...patch } as DataSourceConfig })
+
+  const onSourceTypeChange = (t: SourceType) => {
+    onChange({ ...value, source_type: t, config: defaultConfigFor(t) })
+  }
+
+  const isExternal = value.config.type === "external"
+  const isClock = value.config.type === "clock"
+  const isStaticText = value.config.type === "static_text"
+
   return (
     <div className="grid gap-4 py-2">
       <div className="grid gap-2">
@@ -316,7 +339,7 @@ function DataSourceForm({
         <Label>Source Type</Label>
         <Select
           value={value.source_type}
-          onValueChange={(v) => set("source_type", v as SourceType)}
+          onValueChange={(v) => onSourceTypeChange(v as SourceType)}
         >
           <SelectTrigger>
             <SelectValue />
@@ -330,11 +353,14 @@ function DataSourceForm({
           </SelectContent>
         </Select>
       </div>
+
+      {isExternal && (
+        <>
           <div className="grid gap-2">
             <Label>URL</Label>
             <Input
-          value={value.url ?? ""}
+              value={value.config.url ?? ""}
-          onChange={(e) => set("url", e.target.value || null)}
+              onChange={(e) => setConfig({ url: e.target.value || null })}
               placeholder="https://..."
             />
           </div>
@@ -342,11 +368,46 @@ function DataSourceForm({
             <Label>API Key</Label>
             <Input
               type="password"
-          value={value.api_key ?? ""}
+              value={value.config.api_key ?? ""}
-          onChange={(e) => set("api_key", e.target.value || null)}
+              onChange={(e) => setConfig({ api_key: e.target.value || null })}
               placeholder="Optional"
             />
           </div>
+        </>
+      )}
+
+      {isClock && (
+        <>
+          <div className="grid gap-2">
+            <Label>Format</Label>
+            <Input
+              value={value.config.format}
+              onChange={(e) => setConfig({ format: e.target.value })}
+              placeholder="%H:%M:%S"
+            />
+          </div>
+          <div className="grid gap-2">
+            <Label>Timezone</Label>
+            <Input
+              value={value.config.timezone}
+              onChange={(e) => setConfig({ timezone: e.target.value })}
+              placeholder="Europe/Warsaw"
+            />
+          </div>
+        </>
+      )}
+
+      {isStaticText && (
+        <div className="grid gap-2">
+          <Label>Text</Label>
+          <Input
+            value={value.config.text}
+            onChange={(e) => setConfig({ text: e.target.value })}
+            placeholder="Hello world"
+          />
+        </div>
+      )}
+
       <div className="grid gap-2">
         <Label>Poll Interval (seconds)</Label>
         <Input
@@ -356,6 +417,8 @@ function DataSourceForm({
           min={1}
         />
       </div>
+
+      {isExternal && (
         <div className="grid gap-2">
           <div className="flex items-center justify-between">
             <Label>Headers</Label>
@@ -363,34 +426,35 @@ function DataSourceForm({
               variant="outline"
               size="sm"
               onClick={() =>
-              set("headers", [...value.headers, ["", ""]])
+                setConfig({ headers: [...value.config.headers, ["", ""]] })
               }
             >
               <Plus className="mr-1 h-3 w-3" />
               Add
             </Button>
           </div>
-        {value.headers.map(([k, v], i) => (
+          {value.config.headers.map(([k, v], i) => (
             <HeaderRow
               key={i}
               headerKey={k}
               headerValue={v}
               onChangeKey={(newKey) => {
-              const next = [...value.headers] as [string, string][]
+                const next = [...value.config.headers] as [string, string][]
                 next[i] = [newKey, v]
-              set("headers", next)
+                setConfig({ headers: next })
               }}
               onChangeValue={(newVal) => {
-              const next = [...value.headers] as [string, string][]
+                const next = [...value.config.headers] as [string, string][]
                 next[i] = [k, newVal]
-              set("headers", next)
+                setConfig({ headers: next })
               }}
               onRemove={() =>
-              set("headers", value.headers.filter((_, idx) => idx !== i))
+                setConfig({ headers: value.config.headers.filter((_, idx) => idx !== i) })
               }
             />
           ))}
         </div>
+      )}
     </div>
   )
 }

spa/src/pages/widgets.tsx

@@ -199,8 +199,7 @@ export function WidgetsPage() {
               onClick={save}
               disabled={
                 !editing?.name ||
-                !editing.data_source_id ||
+                !editing.data_source_id
-                editing.mappings.length === 0
               }
             >
               Save