wifi_prov: Exposed event for transport pairing

Closes https://github.com/espressif/esp-idf/issues/10007

components/protocomm/include/transports/protocomm_ble.h

@@ -7,11 +7,25 @@
 #pragma once
 
 #include <protocomm.h>
+#include "esp_event.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+ESP_EVENT_DECLARE_BASE(PROTOCOMM_TRANSPORT_BLE_EVENT);
+
+/**
+ * @brief   Events generated by BLE transport
+ *
+ * These events are generated when the BLE transport is paired
+ * and disconnected.
+ */
+typedef enum {
+    PROTOCOMM_TRANSPORT_BLE_CONNECTED,
+    PROTOCOMM_TRANSPORT_BLE_DISCONNECTED,
+} protocomm_transport_ble_event_t;
+
 /**
  * BLE device name cannot be larger than this value
  * 31 bytes (max scan response size) - 1 byte (length) - 1 byte (type) = 29 bytes

components/protocomm/src/transports/protocomm_ble.c

@@ -15,6 +15,8 @@
 #include "protocomm_priv.h"
 #include "simple_ble.h"
 
+ESP_EVENT_DEFINE_BASE(PROTOCOMM_TRANSPORT_BLE_EVENT);
+
 /* NOTE: For the security2 scheme, the payload size is quite larger
  * than that for security1. The increased value has been selected
  * keeping in mind the largest packet size for security2 and the
@@ -25,6 +27,7 @@
 #else
     #define CHAR_VAL_LEN_MAX         (256 + 1)
 #endif // CONFIG_ESP_PROTOCOMM_SUPPORT_SECURITY_VERSION_2
+
 #define PREPARE_BUF_MAX_SIZE     CHAR_VAL_LEN_MAX
 
 static const char *TAG = "protocomm_ble";
@@ -342,6 +345,10 @@ static void transport_simple_ble_disconnect(esp_gatts_cb_event_t event, esp_gatt
                 param->disconnect.conn_id);
         if (ret != ESP_OK) {
             ESP_LOGE(TAG, "error closing the session after disconnect");
+        } else {
+            if (esp_event_post(PROTOCOMM_TRANSPORT_BLE_EVENT, PROTOCOMM_TRANSPORT_BLE_DISCONNECTED, NULL, 0, portMAX_DELAY) != ESP_OK) {
+                ESP_LOGE(TAG, "Failed to post transport disconnection event");
+            }
         }
     }
     protoble_internal->gatt_mtu = ESP_GATT_DEF_BLE_MTU_SIZE;
@@ -357,6 +364,10 @@ static void transport_simple_ble_connect(esp_gatts_cb_event_t event, esp_gatt_if
                 param->connect.conn_id);
         if (ret != ESP_OK) {
             ESP_LOGE(TAG, "error creating the session");
+        } else {
+            if (esp_event_post(PROTOCOMM_TRANSPORT_BLE_EVENT, PROTOCOMM_TRANSPORT_BLE_CONNECTED, NULL, 0, portMAX_DELAY) != ESP_OK) {
+                ESP_LOGE(TAG, "Failed to post transport pairing event");
+            }
         }
     }
 }

components/protocomm/src/transports/protocomm_nimble.c

@@ -22,6 +22,8 @@
 
 static const char *TAG = "protocomm_nimble";
 
+ESP_EVENT_DEFINE_BASE(PROTOCOMM_TRANSPORT_BLE_EVENT);
+
 int ble_uuid_flat(const ble_uuid_t *, void *);
 static uint8_t ble_uuid_base[BLE_UUID128_VAL_LENGTH];
 static int num_chr_dsc;
@@ -226,7 +228,7 @@ simple_ble_gap_event(struct ble_gap_event *event, void *arg)
                 ESP_LOGE(TAG, "No open connection with the specified handle");
                 return rc;
             }
-	    s_cached_conn_handle = event->connect.conn_handle;
+            s_cached_conn_handle = event->connect.conn_handle;
         } else {
             /* Connection failed; resume advertising. */
             simple_ble_advertise();
@@ -236,7 +238,11 @@ simple_ble_gap_event(struct ble_gap_event *event, void *arg)
     case BLE_GAP_EVENT_DISCONNECT:
         ESP_LOGD(TAG, "disconnect; reason=%d ", event->disconnect.reason);
         transport_simple_ble_disconnect(event, arg);
-        s_cached_conn_handle = 0; /* Clear conn_handle value */
+        /* Clear conn_handle value */
+        s_cached_conn_handle = 0;
+        if (esp_event_post(PROTOCOMM_TRANSPORT_BLE_EVENT, PROTOCOMM_TRANSPORT_BLE_DISCONNECTED, NULL, 0, portMAX_DELAY) != ESP_OK) {
+            ESP_LOGE(TAG, "Failed to post pairing event");
+        }
         /* Connection terminated; resume advertising. */
         simple_ble_advertise();
         return 0;
@@ -552,6 +558,10 @@ static void transport_simple_ble_disconnect(struct ble_gap_event *event, void *a
             protoble_internal->pc_ble->sec->close_transport_session(protoble_internal->pc_ble->sec_inst, event->disconnect.conn.conn_handle);
         if (ret != ESP_OK) {
             ESP_LOGE(TAG, "error closing the session after disconnect");
+        } else {
+            if (esp_event_post(PROTOCOMM_TRANSPORT_BLE_EVENT, PROTOCOMM_TRANSPORT_BLE_DISCONNECTED, NULL, 0, portMAX_DELAY) != ESP_OK) {
+                ESP_LOGE(TAG, "Failed to post transport disconnection event");
+            }
         }
     }
     protoble_internal->gatt_mtu = BLE_ATT_MTU_DFLT;
@@ -567,6 +577,10 @@ static void transport_simple_ble_connect(struct ble_gap_event *event, void *arg)
             protoble_internal->pc_ble->sec->new_transport_session(protoble_internal->pc_ble->sec_inst, event->connect.conn_handle);
         if (ret != ESP_OK) {
             ESP_LOGE(TAG, "error creating the session");
+        } else {
+            if (esp_event_post(PROTOCOMM_TRANSPORT_BLE_EVENT, PROTOCOMM_TRANSPORT_BLE_CONNECTED, NULL, 0, portMAX_DELAY) != ESP_OK) {
+                ESP_LOGE(TAG, "Failed to post transport pairing event");
+            }
         }
     }
 }

examples/provisioning/wifi_prov_mgr/main/app_main.c

@@ -156,16 +156,44 @@ static void event_handler(void* arg, esp_event_base_t event_base,
             default:
                 break;
         }
-    } else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {
-        esp_wifi_connect();
+    } else if (event_base == WIFI_EVENT) {
+        switch (event_id) {
+            case WIFI_EVENT_STA_START:
+                esp_wifi_connect();
+                break;
+            case WIFI_EVENT_STA_DISCONNECTED:
+                ESP_LOGI(TAG, "Disconnected. Connecting to the AP again...");
+                esp_wifi_connect();
+                break;
+#ifdef CONFIG_EXAMPLE_PROV_TRANSPORT_SOFTAP
+            case WIFI_EVENT_AP_STACONNECTED:
+                ESP_LOGI(TAG, "SoftAP transport: Connected!");
+                break;
+            case WIFI_EVENT_AP_STADISCONNECTED:
+                ESP_LOGI(TAG, "SoftAP transport: Disconnected!");
+                break;
+#endif
+            default:
+                break;
+        }
     } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
         ip_event_got_ip_t* event = (ip_event_got_ip_t*) event_data;
         ESP_LOGI(TAG, "Connected with IP Address:" IPSTR, IP2STR(&event->ip_info.ip));
         /* Signal main application to continue execution */
         xEventGroupSetBits(wifi_event_group, WIFI_CONNECTED_EVENT);
-    } else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
-        ESP_LOGI(TAG, "Disconnected. Connecting to the AP again...");
-        esp_wifi_connect();
+#ifdef CONFIG_EXAMPLE_PROV_TRANSPORT_BLE
+    } else if (event_base == PROTOCOMM_TRANSPORT_BLE_EVENT) {
+        switch (event_id) {
+            case PROTOCOMM_TRANSPORT_BLE_CONNECTED:
+                ESP_LOGI(TAG, "BLE transport: Connected!");
+                break;
+            case PROTOCOMM_TRANSPORT_BLE_DISCONNECTED:
+                ESP_LOGI(TAG, "BLE transport: Disconnected!");
+                break;
+            default:
+                break;
+        }
+#endif
     }
 }
 
@@ -258,6 +286,9 @@ void app_main(void)
 
     /* Register our event handler for Wi-Fi, IP and Provisioning related events */
     ESP_ERROR_CHECK(esp_event_handler_register(WIFI_PROV_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL));
+#ifdef CONFIG_EXAMPLE_PROV_TRANSPORT_BLE
+    ESP_ERROR_CHECK(esp_event_handler_register(PROTOCOMM_TRANSPORT_BLE_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL));
+#endif
     ESP_ERROR_CHECK(esp_event_handler_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL));
     ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &event_handler, NULL));