Mbed OS Reference | CellularNonIPSocket.h Source File

 /* CellularNonIPSocket
  * Copyright (c) 2015 ARM Limited
  * 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 CELLULARNONIPSOCKET_H
 #define CELLULARNONIPSOCKET_H
 
 #include "netsocket/Socket.h"
 #include "rtos/Mutex.h"
 #include "rtos/EventFlags.h"
 #include "Callback.h"
 #include "mbed_atomic.h"
 #include "mbed_toolchain.h"
 #include "ControlPlane_netif.h"
 #include "CellularContext.h"
 
 namespace mbed {
 
 /** \addtogroup netsocket */
 /** @{*/
 
 /** Socket implementation for cellular Non-IP data delivery(NIDD).
  *  Relies on Control Plane CIoT EPS optimization feature,
  *  implemented in ControlPlane_netif class.
  */
 class CellularNonIPSocket : public Socket {
 public:
     /** Destroy the socket.
     *
     *  @note Closes socket if it's still open.
     */
     ~CellularNonIPSocket() override;
 
     /** Creates a socket.
     */
     CellularNonIPSocket();
 
     /** Opens a socket on the given cellular context.
     *
     *  @param cellular_context     Cellular PDP context over which this socket is sending and
     *                              receiving data. The context has support for providing
     *                              a control plane interface for data delivery.
     *  @return                     NSAPI_ERROR_OK on success
     *                              NSAPI_ERROR_PARAMETER otherwise
     */
     nsapi_error_t open(mbed::CellularContext *cellular_context);
 
     /** Opens a socket that will use the given control plane interface for data delivery.
     *   Attaches the event as callback to the control plane interface.
     *
     *  @param cp_netif     Control plane interface for data delivery.
     *  @return             NSAPI_ERROR_OK on success
     *                      NSAPI_ERROR_PARAMETER otherwise
     *
     */
     nsapi_error_t open(mbed::ControlPlane_netif *cp_netif);
 
     /** Closes socket
     *
     *  @return         NSAPI_ERROR_OK on success
     *                  NSAPI_ERROR_NO_SOCKET otherwise
     */
 
     nsapi_error_t close() override;
 
     /** Send data over a control plane cellular context.
     *
     *  By default, send blocks until all data is sent. If socket is set to
     *  nonblocking or times out, a partial amount can be written.
     *  NSAPI_ERROR_WOULD_BLOCK is returned if no data was written.
     *
     *  @param data     Buffer of data to be sent.
     *  @param size     Size of the buffer in bytes.
     *  @return         Number of sent bytes on success, negative error
     *                  code on failure.
     */
     nsapi_size_or_error_t send(const void *data, nsapi_size_t size) override;
 
     /** Receive data from a socket.
     *
     *  By default, recv blocks until some data is received. If socket is set to
     *  nonblocking or times out, NSAPI_ERROR_WOULD_BLOCK can be returned to
     *  indicate no data.
     *
     *  @param data     Pointer to buffer for received data.
     *  @param size     Size of the buffer in bytes.
     *  @return         Number of received bytes on success, negative error
     *                  code on failure.
     */
     nsapi_size_or_error_t recv(void *data, nsapi_size_t size) override;
 
     /** @copydoc Socket::set_blocking
      */
     void set_blocking(bool blocking) override;
 
     /** @copydoc Socket::set_timeout
      */
     void set_timeout(int timeout) override;
 
     /** @copydoc Socket::sigio
      */
     void sigio(mbed::Callback<void()> func) override;
 
     /// NOT APPLICABLE
     nsapi_error_t connect(const SocketAddress &address) override;
     /// NOT APPLICABLE
     Socket *accept(nsapi_error_t *error = NULL) override;
     /// NOT APPLICABLE
     nsapi_error_t listen(int backlog = 1) override;
     /// NOT APPLICABLE
     nsapi_error_t setsockopt(int level, int optname, const void *optval, unsigned optlen) override;
     /// NOT APPLICABLE
     nsapi_error_t getsockopt(int level, int optname, void *optval, unsigned *optlen) override;
     /// NOT APPLICABLE
     nsapi_error_t getpeername(SocketAddress *address) override;
     /// NOT APPLICABLE
     nsapi_size_or_error_t sendto(const SocketAddress &address,
                                  const void *data, nsapi_size_t size) override;
     /// NOT APPLICABLE
     nsapi_size_or_error_t recvfrom(SocketAddress *address,
                                    void *data, nsapi_size_t size) override;
     /// NOT APPLICABLE
     nsapi_error_t bind(const SocketAddress &address) override;
 
 protected:
     void event();
 
     uint32_t _timeout = osWaitForever;
     mbed::Callback<void()> _event;
     mbed::Callback<void()> _callback;
     rtos::EventFlags _event_flag;
     rtos::Mutex _lock;
     uint8_t _readers = 0;
     uint8_t _writers = 0;
     core_util_atomic_flag _pending = CORE_UTIL_ATOMIC_FLAG_INIT;
 
     // Event flags
     static const int READ_FLAG     = 0x1u;
     static const int WRITE_FLAG    = 0x2u;
     static const int FINISHED_FLAG = 0x3u;
 
     static ControlPlane_netif *_cp_netif; // there can be only one Non-IP socket
     bool _opened = false;
 };
 
 /** @}*/
 } // namespace mbed
 
 #endif // CELLULARNONIPSOCKET_H
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