feat: implement OTA updates over HTTP(S), initiated over MQTT

main/CMakeLists.txt

@@ -12,6 +12,8 @@ idf_component_register(
         ble_scanner
         mqtt_publisher
         led_indicator
+        ota_manager
+        app_update
         driver
         esp_driver_gpio
 )

main/main.c

@@ -3,6 +3,8 @@
 #include "ble_scanner.h"
 #include "mqtt_publisher.h"
 #include "led_indicator.h"
+#include "ota_manager.h"
+#include "esp_ota_ops.h"
 
 #include "esp_wifi.h"
 #include "esp_event.h"
@@ -19,7 +21,7 @@
 
 #define TAG "main"
 
-#define WIFI_CONNECTED_BIT BIT8   /* must not clash with mqtt_publisher bits (BIT0–BIT6) */
+#define WIFI_CONNECTED_BIT BIT8   /* must not clash with mqtt_publisher bits (BIT0-BIT7) */
 
 #define DEFAULT_MQTT_PORT 1883
 #define MDNS_QUERY_TIMEOUT_MS 3000
@@ -222,6 +224,15 @@ void app_main(void)
     ESP_ERROR_CHECK(mqtt_publisher_init(sensor_id, broker_uri, s_evt));
     xEventGroupWaitBits(s_evt, MQTT_CONNECTED_BIT, pdFALSE, pdTRUE, portMAX_DELAY);
 
+    /* Confirm this firmware is healthy so the bootloader won't roll back */
+    esp_ota_img_states_t ota_state;
+    const esp_partition_t *running = esp_ota_get_running_partition();
+    if (esp_ota_get_state_partition(running, &ota_state) == ESP_OK &&
+        ota_state == ESP_OTA_IMG_PENDING_VERIFY) {
+        esp_ota_mark_app_valid_cancel_rollback();
+        ESP_LOGI(TAG, "OTA rollback cancelled - firmware validated");
+    }
+
     // init BLE scanner
     ble_scanner_init(on_ble_scan_result);
     ble_scanner_start();
@@ -233,7 +244,8 @@ void app_main(void)
     const EventBits_t cmd_bits =
         MQTT_CALIBRATE_START | MQTT_CALIBRATE_STOP |
         MQTT_SELECTED_BIT    | MQTT_DESELECTED_BIT |
-        MQTT_FACTORY_RESET_BIT | MQTT_RECONFIGURE_SETTINGS_BIT;
+        MQTT_FACTORY_RESET_BIT | MQTT_RECONFIGURE_SETTINGS_BIT |
+        MQTT_OTA_BIT;
 
     bool calibrating = false;
     bool selected    = false;
@@ -262,6 +274,11 @@ void app_main(void)
             selected = false;
             if (!calibrating) led_indicator_set(LED_SCANNING);
         }
+        if (bits & MQTT_OTA_BIT) {
+            const mqtt_ota_data_t *ota = mqtt_publisher_get_ota_data();
+            ESP_LOGI(TAG, "OTA requested: url=%s version=%s", ota->url, ota->version);
+            ota_manager_start(ota->url, ota->version);
+        }
         if (bits & MQTT_FACTORY_RESET_BIT) {
             // factory reset requested - erase NVS and reboot
             ESP_LOGI(TAG, "Factory reset requested");