Merge branch 'bugfix/btdm_blufi_send_longer_custom_data_will_congested_v3.3' into 'release/v3.3'

component/bt: fix Blufi sends longer customer data will will lead congested(backport v3.3)

See merge request espressif/esp-idf!11724

components/bt/bluedroid/btc/profile/esp/blufi/blufi_prf.c

@@ -36,6 +36,7 @@
 #include "blufi_int.h"
 
 #include "esp_blufi_api.h"
+#include "esp_gatt_common_api.h"
 
 #if (GATTS_INCLUDED == TRUE)
 
@@ -456,6 +457,7 @@ static void btc_blufi_recv_handler(uint8_t *data, int len)
         }
     }
 }
+
 void btc_blufi_send_encap(uint8_t type, uint8_t *data, int total_data_len)
 {
     struct blufi_hdr *hdr = NULL;
@@ -526,10 +528,21 @@ void btc_blufi_send_encap(uint8_t type, uint8_t *data, int total_data_len)
             remain_len -= hdr->data_len;
         }
 
-        btc_blufi_send_notify((uint8_t *)hdr,
+retry:
+        if (blufi_env.is_connected == false) {
+            return;
+        }
+
+        if (esp_ble_get_cur_sendable_packets_num(BTC_GATT_GET_CONN_ID(blufi_env.conn_id)) > 0) {
+            btc_blufi_send_notify((uint8_t *)hdr,
                 ((hdr->fc & BLUFI_FC_CHECK) ?
                  hdr->data_len + sizeof(struct blufi_hdr) + 2 :
                  hdr->data_len + sizeof(struct blufi_hdr)));
+        } else {
+            BTC_TRACE_WARNING("%s wait to send blufi custom data\n", __func__);
+            vTaskDelay(pdMS_TO_TICKS(10));
+            goto retry;
+        }
 
         osi_free(hdr);
         hdr =  NULL;