Mbed OS Reference | ControlPlane

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 /*
  * Copyright (c) 2018, Arm Limited and affiliates.
  * SPDX-License-Identifier: Apache-2.0
  *
  * 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 CONTROLPLANE_NETIF_H_
 #define CONTROLPLANE_NETIF_H_
 
 #include "nsapi_types.h"
 
 /** @file ControlPlane_netif.h
  * @brief Implements support for data transfer using Control Plane CIoT EPS optimization.
  *
  */
 
 namespace mbed {
 
 /* Length of the buffer storing data received over control plane */
 #ifndef MBED_CONF_CELLULAR_MAX_CP_DATA_RECV_LEN
 #define MBED_CONF_CELLULAR_MAX_CP_DATA_RECV_LEN 1358
 #endif
 
 
 /**
  * @addtogroup cellular
  * @{
  */
 
 /** Implements support for data transfer using
  *  Control Plane CIoT EPS optimization specified in 3GPP 23.401(4.10), 3GPP 23.682(4.5.14).
  */
 class ControlPlane_netif {
 public:
     virtual ~ControlPlane_netif() = default;
 
 protected:
     friend class CellularNonIPSocket;
     friend class CellularContext;
 
     /** Send data over cellular control plane
     *
     *  @param cpdata            Buffer of data to be sent over control plane connection
     *  @param cpdata_length     Length of data in bytes
     *  @return                  Number of sent bytes on success, negative error
     *                           code on failure.
     */
     virtual nsapi_size_or_error_t send(const void *cpdata, nsapi_size_t cpdata_length) = 0;
 
     /** Receive data over cellular control plane
     *
     *  @param cpdata            Destination buffer for data received from control plane connection
     *  @param cpdata_length     Length of data in bytes
     *  @return                  Number of received bytes on success, negative error
     *                           code on failure.
     */
     virtual nsapi_size_or_error_t recv(void *cpdata, nsapi_size_t cpdata_length) = 0;
 
     /** Receives data from the control plane PDP context
     *
     *  This function is called by cellular PDP context when data
     *  is received from network. It will invoke the callback set
     *  by the above attach.
     *
     */
     virtual void data_received() = 0;
 
     /** Register a callback on state change of the socket
     *
     *  The specified callback will be called on state changes such as when
     *  the socket can recv/send successfully and on when an error
     *  occurs. The callback may also be called spuriously without reason.
     *
     *  The callback may be called in an interrupt context and should not
     *  perform expensive operations such as recv/send calls.
     *
     *  @param callback     Function to call on state change
     *  @param data         Argument to pass to callback
     */
     virtual void attach(void (*callback)(void *), void *data) = 0;
 };
 
 /**
  * @}
  */
 
 } // mbed namespace
 #endif
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