esp_modem: Initial version based on IDF 4.3

esp_modem/include/esp_modem_dte.h

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+// 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.
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "esp_types.h"
+#include "esp_err.h"
+#include "esp_event.h"
+
+typedef struct modem_dte modem_dte_t;
+typedef struct modem_dce modem_dce_t;
+
+/**
+ * @brief Working mode of Modem
+ *
+ */
+typedef enum {
+    MODEM_COMMAND_MODE = 0, /*!< Command Mode */
+    MODEM_PPP_MODE,         /*!< PPP Mode */
+    MODEM_TRANSITION_MODE   /*!< Transition Mode betwen data and command mode indicating that
+                                 the modem is not yet ready for sending commands nor data */
+} modem_mode_t;
+
+/**
+ * @brief Modem flow control type
+ *
+ */
+typedef enum {
+    MODEM_FLOW_CONTROL_NONE = 0,
+    MODEM_FLOW_CONTROL_SW,
+    MODEM_FLOW_CONTROL_HW
+} modem_flow_ctrl_t;
+
+/**
+ * @brief DTE(Data Terminal Equipment)
+ *
+ */
+struct modem_dte {
+    modem_flow_ctrl_t flow_ctrl;                                                    /*!< Flow control of DTE */
+    modem_dce_t *dce;                                                               /*!< DCE which connected to the DTE */
+    esp_err_t (*send_cmd)(modem_dte_t *dte, const char *command, uint32_t timeout); /*!< Send command to DCE */
+    int (*send_data)(modem_dte_t *dte, const char *data, uint32_t length);          /*!< Send data to DCE */
+    esp_err_t (*send_wait)(modem_dte_t *dte, const char *data, uint32_t length,
+                           const char *prompt, uint32_t timeout);      /*!< Wait for specific prompt */
+    esp_err_t (*change_mode)(modem_dte_t *dte, modem_mode_t new_mode); /*!< Changing working mode */
+    esp_err_t (*process_cmd_done)(modem_dte_t *dte);                   /*!< Callback when DCE process command done */
+    esp_err_t (*deinit)(modem_dte_t *dte);                             /*!< Deinitialize */
+};
+
+#ifdef __cplusplus
+}
+#endif