add all crates: domain, protocol, application, client, adapters, ESP32 firmware

Server: domain (entities, value objects, ports), protocol (postcard wire types),
application (config service, data projection), adapters (config-memory, tcp-server),
bootstrap (composition root with fake data).

Client: client-domain (layout engine, render tree, HAL ports),
client-application (message handling, repaint commands),
adapters (tcp-client, display-terminal), client-desktop (end-to-end working).

ESP32: client-esp32 firmware with ILI9341 display over SPI, WiFi networking.
Display test verified on hardware — landscape orientation, text rendering works.

60 workspace tests, all passing.

crates/domain/tests/data_source_tests.rs

@@ -0,0 +1,51 @@
+use std::time::Duration;
+use domain::{DataSource, DataSourceConfig, DataSourceType, DataSourceValidationError};
+
+fn make_source(source_type: DataSourceType, url: Option<&str>, poll: Duration) -> DataSource {
+    DataSource {
+        id: 1,
+        name: "test".into(),
+        source_type,
+        poll_interval: poll,
+        config: DataSourceConfig {
+            url: url.map(Into::into),
+            headers: vec![],
+            api_key: None,
+        },
+    }
+}
+
+#[test]
+fn http_json_requires_url() {
+    let source = make_source(DataSourceType::HttpJson, None, Duration::from_secs(60));
+    let errors = source.validate();
+    assert!(errors.contains(&DataSourceValidationError::UrlRequired));
+}
+
+#[test]
+fn webhook_does_not_allow_poll_interval() {
+    let source = make_source(DataSourceType::Webhook, None, Duration::from_secs(60));
+    let errors = source.validate();
+    assert!(errors.contains(&DataSourceValidationError::PollIntervalNotAllowed));
+}
+
+#[test]
+fn webhook_with_zero_interval_is_valid() {
+    let source = make_source(DataSourceType::Webhook, None, Duration::ZERO);
+    let errors = source.validate();
+    assert!(errors.is_empty());
+}
+
+#[test]
+fn poll_based_source_requires_nonzero_interval() {
+    let source = make_source(DataSourceType::Weather, Some("https://api.weather.com"), Duration::ZERO);
+    let errors = source.validate();
+    assert!(errors.contains(&DataSourceValidationError::PollIntervalRequired));
+}
+
+#[test]
+fn valid_poll_source_has_no_errors() {
+    let source = make_source(DataSourceType::Rss, Some("https://feed.example.com"), Duration::from_secs(300));
+    let errors = source.validate();
+    assert!(errors.is_empty());
+}

crates/domain/tests/key_mapping_tests.rs

@@ -0,0 +1,33 @@
+use std::collections::BTreeMap;
+use domain::{KeyMapping, Value};
+
+#[test]
+fn extracts_value_at_path_and_renames_key() {
+    let mapping = KeyMapping {
+        source_path: "$.main.temp".into(),
+        target_key: "temperature".into(),
+    };
+
+    let raw = Value::Object(BTreeMap::from([
+        ("main".into(), Value::Object(BTreeMap::from([
+            ("temp".into(), Value::Number(5.4)),
+        ]))),
+    ]));
+
+    let result = mapping.extract(&raw);
+    assert_eq!(result, Some(("temperature".into(), Value::Number(5.4))));
+}
+
+#[test]
+fn returns_none_when_path_does_not_match() {
+    let mapping = KeyMapping {
+        source_path: "$.missing.path".into(),
+        target_key: "value".into(),
+    };
+
+    let raw = Value::Object(BTreeMap::from([
+        ("other".into(), Value::Number(1.0)),
+    ]));
+
+    assert_eq!(mapping.extract(&raw), None);
+}

crates/domain/tests/layout_tests.rs

@@ -0,0 +1,66 @@
+use std::collections::BTreeSet;
+use domain::{
+    ContainerNode, Direction, Layout, LayoutChild, LayoutNode, LayoutValidationError, Sizing,
+    WidgetId,
+};
+
+fn leaf(id: WidgetId) -> LayoutChild {
+    LayoutChild {
+        sizing: Sizing::Flex(1),
+        node: LayoutNode::Leaf(id),
+    }
+}
+
+fn row(children: Vec<LayoutChild>) -> LayoutNode {
+    LayoutNode::Container(ContainerNode {
+        direction: Direction::Row,
+        gap: 0,
+        padding: 0,
+        children,
+    })
+}
+
+#[test]
+fn validate_returns_empty_when_all_widgets_exist() {
+    let layout = Layout { root: row(vec![leaf(1), leaf(2)]) };
+    let known = BTreeSet::from([1, 2]);
+    assert!(layout.validate(&known).is_empty());
+}
+
+#[test]
+fn validate_reports_unknown_widget_ids() {
+    let layout = Layout { root: row(vec![leaf(1), leaf(99)]) };
+    let known = BTreeSet::from([1]);
+    let errors = layout.validate(&known);
+    assert_eq!(errors, vec![LayoutValidationError::UnknownWidget(99)]);
+}
+
+#[test]
+fn validate_reports_empty_container() {
+    let layout = Layout { root: row(vec![]) };
+    let known = BTreeSet::new();
+    let errors = layout.validate(&known);
+    assert_eq!(errors, vec![LayoutValidationError::EmptyContainer]);
+}
+
+#[test]
+fn validate_checks_nested_containers() {
+    let inner = LayoutChild {
+        sizing: Sizing::Flex(1),
+        node: row(vec![leaf(1), leaf(42)]),
+    };
+    let layout = Layout { root: row(vec![inner, leaf(2)]) };
+    let known = BTreeSet::from([1, 2]);
+    let errors = layout.validate(&known);
+    assert_eq!(errors, vec![LayoutValidationError::UnknownWidget(42)]);
+}
+
+#[test]
+fn widget_ids_collects_all_leaf_ids() {
+    let inner = LayoutChild {
+        sizing: Sizing::Flex(1),
+        node: row(vec![leaf(3)]),
+    };
+    let layout = Layout { root: row(vec![leaf(1), inner, leaf(2)]) };
+    assert_eq!(layout.widget_ids(), BTreeSet::from([1, 2, 3]));
+}

crates/domain/tests/value_tests.rs

@@ -0,0 +1,77 @@
+use std::collections::BTreeMap;
+use domain::Value;
+
+#[test]
+fn estimated_size_of_string_is_its_byte_length() {
+    let v = Value::String("hello".into());
+    assert_eq!(v.estimated_size(), 5);
+}
+
+#[test]
+fn estimated_size_of_number_is_8_bytes() {
+    assert_eq!(Value::Number(3.14).estimated_size(), 8);
+}
+
+#[test]
+fn estimated_size_of_null_and_bool_is_1() {
+    assert_eq!(Value::Null.estimated_size(), 1);
+    assert_eq!(Value::Bool(true).estimated_size(), 1);
+}
+
+#[test]
+fn estimated_size_of_nested_structure_sums_recursively() {
+    let v = Value::Object(BTreeMap::from([
+        ("key".into(), Value::String("value".into())),
+        ("num".into(), Value::Number(1.0)),
+    ]));
+    assert_eq!(v.estimated_size(), 19);
+}
+
+#[test]
+fn estimated_size_of_array_sums_elements() {
+    let v = Value::Array(vec![
+        Value::String("abc".into()),
+        Value::Number(1.0),
+    ]);
+    assert_eq!(v.estimated_size(), 11);
+}
+
+#[test]
+fn get_path_returns_none_for_missing_key() {
+    let data = Value::Object(BTreeMap::from([
+        ("main".into(), Value::Number(1.0)),
+    ]));
+    assert_eq!(data.get_path("$.missing"), None);
+}
+
+#[test]
+fn get_path_returns_none_when_traversing_non_object() {
+    let data = Value::Object(BTreeMap::from([
+        ("temp".into(), Value::Number(5.4)),
+    ]));
+    assert_eq!(data.get_path("$.temp.nested"), None);
+}
+
+#[test]
+fn get_path_accesses_array_by_index() {
+    let data = Value::Object(BTreeMap::from([
+        ("items".into(), Value::Array(vec![
+            Value::String("first".into()),
+            Value::String("second".into()),
+        ])),
+    ]));
+    assert_eq!(
+        data.get_path("$.items[1]"),
+        Some(&Value::String("second".into()))
+    );
+}
+
+#[test]
+fn get_path_traverses_nested_object() {
+    let data = Value::Object(BTreeMap::from([
+        ("main".into(), Value::Object(BTreeMap::from([
+            ("temp".into(), Value::Number(5.4)),
+        ]))),
+    ]));
+    assert_eq!(data.get_path("$.main.temp"), Some(&Value::Number(5.4)));
+}

crates/domain/tests/widget_tests.rs

@@ -0,0 +1,110 @@
+use std::collections::BTreeMap;
+use domain::{DisplayHint, KeyMapping, Value, WidgetConfig};
+
+#[test]
+fn extract_applies_all_mappings_to_produce_widget_state() {
+    let config = WidgetConfig {
+        id: 1,
+        name: "weather".into(),
+        display_hint: DisplayHint::IconValue,
+        data_source_id: 1,
+        mappings: vec![
+            KeyMapping { source_path: "$.main.temp".into(), target_key: "temperature".into() },
+            KeyMapping { source_path: "$.weather[0].icon".into(), target_key: "icon".into() },
+        ],
+        max_data_size: 2048,
+    };
+
+    let raw = Value::Object(BTreeMap::from([
+        ("main".into(), Value::Object(BTreeMap::from([
+            ("temp".into(), Value::Number(5.4)),
+        ]))),
+        ("weather".into(), Value::Array(vec![
+            Value::Object(BTreeMap::from([
+                ("icon".into(), Value::String("cloud_rain".into())),
+            ])),
+        ])),
+    ]));
+
+    let state = config.extract(&raw);
+
+    assert_eq!(state.data.get("temperature"), Some(&Value::Number(5.4)));
+    assert_eq!(state.data.get("icon"), Some(&Value::String("cloud_rain".into())));
+    assert_eq!(state.error, None);
+}
+
+#[test]
+fn extract_truncates_string_values_exceeding_max_data_size() {
+    let long_text = "a".repeat(3000);
+    let config = WidgetConfig {
+        id: 1,
+        name: "news".into(),
+        display_hint: DisplayHint::TextBlock,
+        data_source_id: 1,
+        mappings: vec![
+            KeyMapping { source_path: "$.text".into(), target_key: "body".into() },
+        ],
+        max_data_size: 100,
+    };
+
+    let raw = Value::Object(BTreeMap::from([
+        ("text".into(), Value::String(long_text)),
+    ]));
+
+    let state = config.extract(&raw);
+    match state.data.get("body") {
+        Some(Value::String(s)) => assert!(s.len() <= 100),
+        other => panic!("expected truncated string, got {:?}", other),
+    }
+}
+
+#[test]
+fn extract_respects_max_data_size_across_total_state() {
+    let config = WidgetConfig {
+        id: 1,
+        name: "big".into(),
+        display_hint: DisplayHint::TextBlock,
+        data_source_id: 1,
+        mappings: vec![
+            KeyMapping { source_path: "$.a".into(), target_key: "a".into() },
+            KeyMapping { source_path: "$.b".into(), target_key: "b".into() },
+            KeyMapping { source_path: "$.c".into(), target_key: "c".into() },
+        ],
+        max_data_size: 50,
+    };
+
+    let raw = Value::Object(BTreeMap::from([
+        ("a".into(), Value::String("x".repeat(20))),
+        ("b".into(), Value::String("y".repeat(20))),
+        ("c".into(), Value::String("z".repeat(20))),
+    ]));
+
+    let state = config.extract(&raw);
+    let total: usize = state.data.values().map(|v| v.estimated_size()).sum();
+    assert!(total <= 50, "total size {total} exceeds max 50");
+}
+
+#[test]
+fn extract_skips_mappings_that_dont_match() {
+    let config = WidgetConfig {
+        id: 1,
+        name: "weather".into(),
+        display_hint: DisplayHint::IconValue,
+        data_source_id: 1,
+        mappings: vec![
+            KeyMapping { source_path: "$.temp".into(), target_key: "temperature".into() },
+            KeyMapping { source_path: "$.missing".into(), target_key: "gone".into() },
+        ],
+        max_data_size: 2048,
+    };
+
+    let raw = Value::Object(BTreeMap::from([
+        ("temp".into(), Value::Number(5.4)),
+    ]));
+
+    let state = config.extract(&raw);
+
+    assert_eq!(state.data.len(), 1);
+    assert_eq!(state.data.get("temperature"), Some(&Value::Number(5.4)));
+    assert_eq!(state.data.get("gone"), None);
+}