[nextion] Expose custom protocol frames as automation triggers (#13248)

Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Co-authored-by: J. Nick Koston <nick@home-assistant.io>

tests/components/nextion/common.yaml

@@ -286,6 +286,31 @@ display:
     on_buffer_overflow:
       then:
         logger.log: "Nextion reported a buffer overflow!"
+    on_custom_text_sensor:
+      then:
+        - lambda: |-
+            // key: StringRef, value: StringRef
+            if (key == "csv") {
+              // parse value here, or forward to your own component
+              ESP_LOGD("nextion.csv", "Got CSV: %s", value.c_str());
+            }
+    on_custom_sensor:
+      then:
+        - lambda: |-
+            // key: StringRef, value: int32_t
+            if (key == "temperature_raw") {
+              ESP_LOGD("nextion.custom", "%s=%d", key.c_str(), value);
+            }
+    on_custom_binary_sensor:
+      then:
+        - lambda: |-
+            if (key == "btn1") {
+              ESP_LOGD("nextion.btn", "btn1=%s", ONOFF(value));
+            }
+    on_custom_switch:
+      then:
+        - lambda: |-
+            ESP_LOGD("nextion.sw", "%s=%s", key.c_str(), ONOFF(value));
     on_page:
       then:
         lambda: 'ESP_LOGD("display","Display shows new page %u", x);'
@@ -304,8 +329,8 @@ display:
     on_wake:
       then:
         lambda: 'ESP_LOGD("display","Display woke up");'
-    update_interval: 5s
     start_up_page: 1
     startup_override_ms: 10000ms  # Wait 10s for display ready
     touch_sleep_timeout: 3
+    update_interval: 5s
     wake_up_page: 2