Dim LED ring, add blink mode, and signal OTA outcome on the ring.

Default brightness is ~5%; UART blink mode and green/red pulses mark OTA success or failure. Failed UART uploads skip ESP-NOW distribution.

Co-authored-by: Cursor <cursoragent@cursor.com>

main/ota_espnow.c

@@ -1,5 +1,6 @@
 #include "ota_espnow.h"
 #include "app_config.h"
+#include "led_ring.h"
 #include "client_registry.h"
 #include "esp_log.h"
 #include "esp_now_comm.h"
@@ -27,6 +28,11 @@ static const char *TAG = "[OTA_ESPNOW]";
 #define OTA_ST_SUCCESS 4u
 #define OTA_ST_FAILED 5u
 
+/** ESP-NOW OTA receive on slave (blue progress bar). */
+#define OTA_LED_ESPNOW_RX_R 0
+#define OTA_LED_ESPNOW_RX_G 0
+#define OTA_LED_ESPNOW_RX_B 255
+
 #define OTA_MAX_TARGETS CLIENT_REGISTRY_MAX
 
 static EventGroupHandle_t s_eg;
@@ -170,6 +176,8 @@ static void ota_slave_prepare_task(void *param) {
   }
 
   send_slave_status(master_mac, OTA_ST_READY, 0, 0);
+  led_ring_show_ota_progress(0, total_size, OTA_LED_ESPNOW_RX_R, OTA_LED_ESPNOW_RX_G,
+                             OTA_LED_ESPNOW_RX_B);
   vTaskDelete(NULL);
 }
 
@@ -214,13 +222,27 @@ void ota_espnow_slave_on_payload(const uint8_t master_mac[6],
   ota_feed_result_t r =
       ota_uart_feed(payload->data.bytes, payload->data.size);
   if (r == OTA_FEED_ERROR) {
+    led_ring_ota_failed();
     send_slave_status(master_mac, OTA_ST_FAILED, ota_uart_bytes_written(), 13);
     return;
   }
   if (r == OTA_FEED_BLOCK_WRITTEN) {
     uint32_t written = ota_uart_bytes_written();
+    uint32_t total = ota_uart_total_size();
     ESP_LOGI(TAG, "block written %lu bytes -> ack master", (unsigned long)written);
+    led_ring_show_ota_progress(written, total, OTA_LED_ESPNOW_RX_R, OTA_LED_ESPNOW_RX_G,
+                               OTA_LED_ESPNOW_RX_B);
     send_slave_status(master_mac, OTA_ST_BLOCK_ACK, written, 0);
+    return;
+  }
+
+  if (r == OTA_FEED_OK) {
+    uint32_t total = ota_uart_total_size();
+    if (total > 0) {
+      led_ring_show_ota_progress(ota_uart_bytes_received(), total,
+                                 OTA_LED_ESPNOW_RX_R, OTA_LED_ESPNOW_RX_G,
+                                 OTA_LED_ESPNOW_RX_B);
+    }
   }
 }
 
@@ -235,11 +257,13 @@ void ota_espnow_slave_on_end(const uint8_t master_mac[6]) {
   bool success = false;
   esp_err_t err = ota_uart_finish(true, &success);
   if (err != ESP_OK || !success) {
+    led_ring_ota_failed();
     send_slave_status(master_mac, OTA_ST_FAILED, written, (uint32_t)err);
     return;
   }
 
   send_slave_status(master_mac, OTA_ST_SUCCESS, written, 0);
+  led_ring_ota_success();
   ESP_LOGI(TAG, "slave OTA success (%lu bytes), reboot to run",
            (unsigned long)written);
 }