Merge branch 'observer-firmware-dev' into fix/mqtt-review-2026-09-09

test/test_config_serializer/test_config_serializer.cpp

@@ -193,6 +193,47 @@ TEST(ConfigSerializer, LoadSerial_IgnoreUnknowns) {
     EXPECT_TRUE(match);
 }
 
+class TestNested : public ConfigSerializer {
+    class Inner : public ConfigSerializer {
+      protected:
+        void structure() override { }   // no properties, so it writes as '{}'
+    };
+    Inner inner;
+  protected:
+    void structure() override {
+        def("age", age);
+        def("inner", inner);
+        def("name", name, sizeof(name));   // comes *after* the empty sub-object
+    }
+  public:
+    int32_t age;
+    char    name[16];
+};
+
+TEST(ConfigSerializer, LoadSerial_EmptyObject) {
+    MockInputStream s("{age:" TEST_INT_S ",inner:{},name:\"Scott\"}");
+    TestNested data;
+    data.name[0] = 0;
+
+    bool success = data.loadSerial(s);
+    EXPECT_TRUE(success);
+
+    EXPECT_EQ(TEST_INT, data.age);
+    bool match = strcmp("Scott", data.name) == 0;
+    EXPECT_TRUE(match);   // properties after an empty object must still load
+}
+
+TEST(ConfigSerializer, LoadSerial_EmptyObjectWithWhitespace) {
+    MockInputStream s("{age:" TEST_INT_S ",inner:{  },name:\"Scott\"}");
+    TestNested data;
+    data.name[0] = 0;
+
+    bool success = data.loadSerial(s);
+    EXPECT_TRUE(success);
+    bool match = strcmp("Scott", data.name) == 0;
+    EXPECT_TRUE(match);
+}
+
 TEST(DynamicConfigSerializer, GetSet_Basic) {
     DynamicConfigSerializer data;