Added change to handle the case of controllers supporting Buffer Size

larger than 251. Current memory allocation for buffers is limited to 251
size and hence fragmentation is needed in case buffer size is larger.

nimble/host/src/ble_hs_hci.c

@@ -413,6 +413,7 @@ ble_hs_hci_rx_evt(uint8_t *hci_ev, void *arg)
     return 0;
 }
 
+#if !(SOC_ESP_NIMBLE_CONTROLLER)
 /**
  * Calculates the largest ACL payload that the controller can accept.
  */
@@ -426,6 +427,7 @@ ble_hs_hci_max_acl_payload_sz(void)
      */
     return ble_hs_hci_buf_sz;
 }
+#endif
 
 /**
  * Allocates an mbuf to contain an outgoing ACL data fragment.
@@ -534,8 +536,11 @@ ble_hs_hci_acl_tx_now(struct ble_hs_conn *conn, struct os_mbuf **om)
 
     /* Send fragments until the entire packet has been sent. */
     while (txom != NULL && ble_hs_hci_avail_pkts > 0) {
-        frag = mem_split_frag(&txom, ble_hs_hci_max_acl_payload_sz(),
-                              ble_hs_hci_frag_alloc, NULL);
+#if SOC_ESP_NIMBLE_CONTROLLER
+        frag = mem_split_frag(&txom, BLE_ACL_MAX_PKT_SIZE, ble_hs_hci_frag_alloc, NULL);
+#else
+        frag = mem_split_frag(&txom, ble_hs_hci_max_acl_payload_sz(), ble_hs_hci_frag_alloc, NULL);
+#endif
         if (frag == NULL) {
             *om = txom;
             return BLE_HS_EAGAIN;