feat(smartconfig): refactor smartconfig callback to use esp event

Consistent with esp-idf(branch: release/v4.2, commit id: c5bb6c4)

components/esp8266/include/smartconfig_ack.h

@@ -0,0 +1,44 @@
+// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef SMARTCONFIG_ACK_H
+#define SMARTCONFIG_ACK_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+  * @brief  Send smartconfig ACK to cellphone.
+  *
+  * @attention The API can only be used when receiving SC_EVENT_GOT_SSID_PSWD event.
+  *
+  * @param  type: smartconfig type(ESPTouch or AirKiss);
+  *         token: token from the cellphone;
+  *         cellphone_ip: IP address of the cellphone;
+  *
+  * @retuen ESP_OK: succeed
+  *         others: fail
+  */
+esp_err_t sc_send_ack_start(smartconfig_type_t type, uint8_t token, uint8_t* cellphone_ip);
+
+/**
+  * @brief  Stop sending smartconfig ACK to cellphone.
+  */
+void sc_send_ack_stop(void);
+
+#ifdef __cplusplus
+}
+#endif
+#endif