Mbed OS Reference | CellularContext.h Source File

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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 _CELLULARCONTEXT_H_
 #define _CELLULARCONTEXT_H_
 
 #include "CellularInterface.h"
 #include "CellularDevice.h"
 #include "CellularUtil.h"
 #include "ControlPlane_netif.h"
 #include "PinNames.h"
 
 /** @file CellularContext.h
  * @brief Cellular PDP context class
  *
  */
 
 namespace mbed {
 
 /**
  * @addtogroup cellular
  * @{
  */
 
 /// CellularContext is CellularInterface/NetworkInterface with extensions for cellular connectivity
 class CellularContext : public CellularInterface {
 
 public:
 
     // max simultaneous PDP contexts active
     static const int PDP_CONTEXT_COUNT = 4;
 
     /* authentication type when activating or modifying the pdp context */
     enum AuthenticationType {
         NOAUTH = 0,
         PAP,
         CHAP,
         AUTOMATIC
     };
 
     /*  whether the additional exception reports are allowed to be sent when the maximum uplink rate is reached */
     enum RateControlExceptionReports {
         NotAllowedToBeSent = 0,
         AllowedToBeSent
     };
 
     /* specifies the time unit to be used for the maximum uplink rate */
     enum RateControlUplinkTimeUnit {
         Unrestricted = 0,
         Minute,
         Hour,
         Day,
         Week
     };
 
     /// PDP Context information
     struct pdpcontext_params_t {
         char apn[MAX_ACCESSPOINT_NAME_LENGTH + 1];
         char local_addr[MAX_IPV6_ADDR_IN_IPV4LIKE_DOTTED_FORMAT + 1];
         char local_subnet_mask[MAX_IPV6_ADDR_IN_IPV4LIKE_DOTTED_FORMAT + 1];
         char gateway_addr[MAX_IPV6_ADDR_IN_IPV4LIKE_DOTTED_FORMAT + 1];
         char dns_primary_addr[MAX_IPV6_ADDR_IN_IPV4LIKE_DOTTED_FORMAT + 1];
         char dns_secondary_addr[MAX_IPV6_ADDR_IN_IPV4LIKE_DOTTED_FORMAT + 1];
         char p_cscf_prim_addr[MAX_IPV6_ADDR_IN_IPV4LIKE_DOTTED_FORMAT + 1];
         char p_cscf_sec_addr[MAX_IPV6_ADDR_IN_IPV4LIKE_DOTTED_FORMAT + 1];
         int cid;
         int bearer_id;
         int im_signalling_flag;
         int lipa_indication;
         int ipv4_mtu;
         int wlan_offload;
         int local_addr_ind;
         int non_ip_mtu;
         int serving_plmn_rate_control_value;
         pdpcontext_params_t *next;
 
         pdpcontext_params_t()
         {
             apn[0] = '\0';
             local_addr[0] = '\0';
             local_subnet_mask[0] = '\0';
             gateway_addr[0] = '\0';
             dns_primary_addr[0] = '\0';
             dns_secondary_addr[0] = '\0';
             p_cscf_prim_addr[0] = '\0';
             p_cscf_sec_addr[0] = '\0';
             cid = -1;
             bearer_id = -1;
             im_signalling_flag = -1;
             lipa_indication = -1;
             ipv4_mtu = -1;
             wlan_offload = -1;
             local_addr_ind = -1;
             non_ip_mtu = -1;
             serving_plmn_rate_control_value = -1;
             next = NULL;
         }
     };
     typedef CellularList<pdpcontext_params_t> pdpContextList_t;
 
     // pointer for next item when used as a linked list
     CellularContext *_next;
 protected:
     // friend of CellularDevice, so it's the only way to close or delete this class.
     friend class CellularDevice;
     CellularContext();
     virtual ~CellularContext() {}
 public: // from NetworkInterface
     virtual nsapi_error_t set_blocking(bool blocking) = 0;
     virtual NetworkStack *get_stack() = 0;
     virtual const char *get_ip_address() = 0;
 
     /** Register callback for status reporting.
      *
      *  The specified status callback function is called on the network, and the cellular device status changes.
      *  The parameters on the callback are the event type and event type dependent reason parameter.
      *
      *  @remark  deleting CellularDevice/CellularContext in callback is not allowed.
      *  @remark  Allocating/adding lots of traces not recommended as callback is called mostly from State machines thread which
      *           is now 2048. You can change to main thread for example via EventQueue.
      *
      *  @param status_cb The callback for status changes.
      */
     virtual void attach(mbed::Callback<void(nsapi_event_t, intptr_t)> status_cb) = 0;
     virtual nsapi_error_t connect() = 0;
     virtual nsapi_error_t disconnect() = 0;
 
     // from CellularInterface
     virtual void set_plmn(const char *plmn) = 0;
     virtual void set_sim_pin(const char *sim_pin) = 0;
     virtual nsapi_error_t connect(const char *sim_pin, const char *apn = 0, const char *uname = 0,
                                   const char *pwd = 0) = 0;
     virtual void set_credentials(const char *apn, const char *uname = 0, const char *pwd = 0) = 0;
     virtual const char *get_netmask() = 0;
     virtual const char *get_gateway() = 0;
     virtual bool is_connected() = 0;
 
     /** Same as NetworkInterface::get_default_instance()
      *
      *  @note not to be used if get_default_nonip_instance() was already used
      *
      */
     static CellularContext *get_default_instance();
 
 
     /** Instantiates a default Non-IP cellular interface
      *
      *  This function creates a new Non-IP PDP context.
      *
      *  @note not to be used if get_default_instance() was already used
      *
      *  @return         A Non-IP cellular PDP context
      *
      */
     static CellularContext *get_default_nonip_instance();
 
     /** Get pointer to CellularDevice instance. May be null if not AT-layer.
      *
      *  @return pointer to CellularDevice instance
      */
     CellularDevice *get_device() const;
 
 // Operations, can be sync/async. Also Connect() is this kind of operation, inherited from NetworkInterface above.
 
     /** Start the interface
      *
      *  Initializes the modem for communication.
      *  By default, this API is synchronous. API can be set to asynchronous with method set_blocking(...).
      *  In synchronous and asynchronous mode application can get result in from callback which is set with
      *  attach(...)
      *
      *  @return         NSAPI_ERROR_OK on success
      *                  NSAPI_ERROR_NO_MEMORY on case of memory failure
      */
     virtual nsapi_error_t set_device_ready() = 0;
 
     /** Start the interface
      *
      *  Attempts to open the SIM.
      *  By default, this API is synchronous. API can be set to asynchronous with method set_blocking(...).
      *  In synchronous and asynchronous mode, the application can get result in from callback, which is set with
      *  attach(...)
      *
      *  @return         NSAPI_ERROR_OK on success
      *                  NSAPI_ERROR_NO_MEMORY on case of memory failure
      */
     virtual nsapi_error_t set_sim_ready() = 0;
 
     /** Start the interface
      *
      *  Attempts to register the device to cellular network.
      *  By default, this API is synchronous. API can be set to asynchronous with method set_blocking(...).
      *  In synchronous and asynchronous mode, the application can get result in from callback, which is set with
      *  attach(...)
      *
      *  @return         NSAPI_ERROR_OK on success
      *                  NSAPI_ERROR_NO_MEMORY on case of memory failure
      */
     virtual nsapi_error_t register_to_network() = 0;
 
     /** Start the interface
      *
      *  Attempts to attach the device to cellular network.
      *  By default, this API is synchronous. API can be set to asynchronous with method set_blocking(...).
      *  In synchronous and asynchronous mode, the application can get result in from callback, which is set with
      *  attach(...)
      *
      *  @return         NSAPI_ERROR_OK on success
      *                  NSAPI_ERROR_NO_MEMORY on case of memory failure
      */
     virtual nsapi_error_t attach_to_network() = 0;
 
 // PDP Context specific functions
 
     /** Get APN rate control.
      *
      *  @remark optional params are not updated if not received from network, so use good defaults
      *  @param reports       Additional exception reports at maximum rate reached are allowed to be sent [optional]
      *  @param time_unit     Uplink time unit with values 0=unrestricted, 1=minute, 2=hour, 3=day, 4=week [optional]
      *  @param uplink_rate   Maximum number of messages per timeUnit [optional]
      *  @return              NSAPI_ERROR_OK on success
      *                       NSAPI_ERROR_DEVICE_ERROR on case of failure
      */
     virtual nsapi_error_t get_rate_control(CellularContext::RateControlExceptionReports &reports,
                                            CellularContext::RateControlUplinkTimeUnit &time_unit, int &uplink_rate) = 0;
 
     /** Get the relevant information for an active nonsecondary PDP context.
      *
      *  @remark optional params are not updated if not received from network.
      *  @param params_list   reference to linked list, which is filled on successful call
      *  @return              NSAPI_ERROR_OK on success
      *                       NSAPI_ERROR_NO_MEMORY on memory failure
      *                       NSAPI_ERROR_DEVICE_ERROR on other failures
      */
     virtual nsapi_error_t get_pdpcontext_params(pdpContextList_t &params_list) = 0;
 
     /** Get backoff timer value
      *
      *  @param backoff_timer Backoff timer value associated with PDP APN in seconds
      *  @return              NSAPI_ERROR_OK on success
      *                       NSAPI_ERROR_PARAMETER if no access point is set or found when activating context
      *                       NSAPI_ERROR_DEVICE_ERROR on failure
      */
     virtual nsapi_error_t get_apn_backoff_timer(int &backoff_timer) = 0;
 
     /** Set the file handle used to communicate with the modem. You can use this to change the default file handle.
      *
      *  @param fh   file handle for communicating with the modem
      */
     virtual void set_file_handle(FileHandle *fh) = 0;
 
 #if (DEVICE_SERIAL && DEVICE_INTERRUPTIN) || defined(DOXYGEN_ONLY)
     /** Set the UART serial used to communicate with the modem. Can be used to change default file handle.
      *  File handle set with this method will use data carrier detect to be able to detect disconnection much faster in PPP mode.
      *
      *  @param serial       UARTSerial used in communication to modem. If null then the default file handle is used.
      *  @param dcd_pin      Pin used to set data carrier detect on/off for the given UART
      *  @param active_high  a boolean set to true if DCD polarity is active low
      */
     virtual void set_file_handle(UARTSerial *serial, PinName dcd_pin = NC, bool active_high = false) = 0;
 #endif // #if DEVICE_SERIAL
 
     /** Returns the control plane AT command interface
      */
     virtual ControlPlane_netif *get_cp_netif() = 0;
 
     /** Get the pdp context id associated with this context.
      *
      *  @return cid
      */
     int get_cid() const;
 
     /** Set the authentication type to be used in user authentication if user name and password are defined
      *
      *  @param type enum AuthenticationType
      */
     void set_authentication_type(AuthenticationType type);
 
 protected: // Device specific implementations might need these so protected
     enum ContextOperation {
         OP_INVALID      = -1,
         OP_DEVICE_READY = 0,
         OP_SIM_READY    = 1,
         OP_REGISTER     = 2,
         OP_ATTACH       = 3,
         OP_CONNECT      = 4,
         OP_MAX          = 5
     };
 
     /** The CellularDevice calls the status callback function on status changes on the network or CellularDevice.
     *
     *  @param ev   event type
     *  @param ptr  event-type dependent reason parameter
     */
     virtual void cellular_callback(nsapi_event_t ev, intptr_t ptr) = 0;
 
     /** Enable or disable hang-up detection
      *
      *  When in PPP data pump mode, it is helpful if the FileHandle will signal hang-up via
      *  POLLHUP, e.g., if the DCD line is deasserted on a UART. During command mode, this
      *  signaling is not desired. enable_hup() controls whether this function should be
      *  active.
      */
     virtual void enable_hup(bool enable) = 0;
 
     /** Triggers control plane's operations needed when control plane data is received,
      *  like socket event, for example.
      */
     void cp_data_received();
 
     /** Retry logic after device attached to network. Retry to find and activate pdp context or in case
      *  of PPP find correct pdp context and open data channel. Retry logic is the same which is used in
      *  CellularStateMachine.
      */
     virtual void do_connect_with_retry();
 
     /** Helper method to call callback function if it is provided
      *
      *  @param status connection status which is parameter in callback function
      */
     void call_network_cb(nsapi_connection_status_t status);
 
     /** Find and activate pdp context or in case of PPP find correct pdp context and open data channel.
      */
     virtual void do_connect();
 
     /** After we have connected successfully we must check that we have a valid IP address.
      *  Some modems/networks don't give IP address right after connect so we must poll it for a while.
      */
     void validate_ip_address();
 
     // member variables needed in target override methods
     NetworkStack *_stack; // must be pointer because of PPP
     pdp_type_t _pdp_type;
     CellularContext::AuthenticationType _authentication_type;
     nsapi_connection_status_t _connect_status;
     cell_callback_data_t _cb_data;
     Callback<void(nsapi_event_t, intptr_t)> _status_cb;
     int _cid;
     bool _new_context_set;
     bool _is_context_active;
     bool _is_context_activated; // did we activate the context
     const char *_apn;
     const char *_uname;
     const char *_pwd;
     PinName _dcd_pin;
     bool _active_high;
 
     ControlPlane_netif *_cp_netif;
     uint16_t _retry_timeout_array[CELLULAR_RETRY_ARRAY_SIZE];
     int _retry_array_length;
     int _retry_count;
     CellularDevice *_device;
     CellularNetwork *_nw;
     bool _is_blocking;
     // flag indicating if Non-IP context was requested to be setup
     bool _nonip_req;
     // tells if CCIOTOPTI received green from network for CP optimization use
     bool _cp_in_use;
 };
 
 /**
  * @}
  */
 
 } // namespace mbed
 
 
 #endif /* _CELLULARCONTEXT_H_ */
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