UbloxATCellularInterface.h

00001 /* Copyright (c) 2017 ARM Limited
00002  *
00003  * Licensed under the Apache License, Version 2.0 (the "License");
00004  * you may not use this file except in compliance with the License.
00005  * You may obtain a copy of the License at
00006  *
00007  *     http://www.apache.org/licenses/LICENSE-2.0
00008  *
00009  * Unless required by applicable law or agreed to in writing, software
00010  * distributed under the License is distributed on an "AS IS" BASIS,
00011  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00012  * See the License for the specific language governing permissions and
00013  * limitations under the License.
00014  */
00015 
00016 #ifndef _UBLOX_AT_CELLULAR_INTERFACE_
00017 #define _UBLOX_AT_CELLULAR_INTERFACE_
00018 
00019 #include "UbloxCellularBase.h"
00020 #include "CellularBase.h"
00021 #include "NetworkStack.h"
00022 
00023 /** UbloxATCellularInterface class.
00024  *
00025  *  This uses the cellular-tuned IP stack that
00026  *  is on-board the cellular modem instead of the
00027  *  LWIP stack on the mbed MCU.
00028  *
00029  *  There are three advantages to using this mechanism:
00030  *
00031  *  1.  Since the modem interface remains in AT mode
00032  *      throughout, it is possible to continue using
00033  *      any AT commands (e.g. send SMS, use the module's
00034  *      file system, etc.) while the connection is up.
00035  *
00036  *  2.  The UbloxATCellularInterfaceExt class can
00037  *      be used to perform very simple HTTP and FTP
00038  *      operations using the modem's on-board clients.
00039  *
00040  *  3.  LWIP is not required (and hence RAM is saved).
00041  *
00042  *  The disadvantage is that some additional parsing
00043  *  (at the AT interface) has to go on in order to exchange
00044  *  IP packets, so this is less efficient under heavy loads.
00045  *  Also TCP Server and getting/setting of socket options is
00046  *  currently not supported.
00047  */
00048 
00049 // Forward declaration
00050 class NetworkStack;
00051 
00052 /*
00053  * NOTE: order is important in the inheritance below!  PAL takes this class
00054  * and casts it to CellularInterface and so CellularInterface has to be first
00055  * in the last for that to work.
00056  */
00057 
00058 /** UbloxATCellularInterface class.
00059  *
00060  *  This class implements the network stack interface into the cellular
00061  *  modems on the C030 and C027 boards for 2G/3G/4G modules using
00062  *  the IP stack running on the cellular module.
00063  */
00064 class UbloxATCellularInterface : public CellularBase, public NetworkStack, virtual public UbloxCellularBase  {
00065 
00066 public:
00067     /** Constructor.
00068      *
00069      * @param tx       the UART TX data pin to which the modem is attached.
00070      * @param rx       the UART RX data pin to which the modem is attached.
00071      * @param baud     the UART baud rate.
00072      * @param debug_on true to switch AT interface debug on, otherwise false.
00073      */
00074      UbloxATCellularInterface(PinName tx = MDMTXD,
00075                               PinName rx = MDMRXD,
00076                               int baud = MBED_CONF_UBLOX_CELL_BAUD_RATE,
00077                               bool debug_on = false,
00078                               osPriority priority = osPriorityNormal);
00079 
00080      /* Destructor.
00081       */
00082      virtual ~UbloxATCellularInterface();
00083 
00084     /** The amount of extra space needed in terms of AT interface
00085      * characters to get a chunk of user data (i.e. one UDP packet
00086      * or a portion of a TCP packet) across the AT interface.
00087      */
00088     #define AT_PACKET_OVERHEAD 77
00089 
00090     /** The profile to use (on board the modem).
00091      */
00092     #define PROFILE "0"
00093 
00094     /** Translates a host name to an IP address with specific IP version.
00095      *
00096      *  The host name may be either a domain name or an IP address. If the
00097      *  host name is an IP address, no network transactions will be performed.
00098      *
00099      *  If no stack-specific DNS resolution is provided, the host name
00100      *  will be resolved using a UDP socket on the stack.
00101      *
00102      *  @param host     Host name to resolve.
00103      *  @param address  Destination for the host SocketAddress.
00104      *  @param version  IP version of address to resolve, NSAPI_UNSPEC indicates
00105      *                  version is chosen by the stack (defaults to NSAPI_UNSPEC).
00106      *  @return         0 on success, negative error code on failure.
00107      */
00108     virtual nsapi_error_t gethostbyname(const char *host,
00109                                         SocketAddress *address,
00110                                         nsapi_version_t version = NSAPI_UNSPEC);
00111 
00112     /** Set the authentication scheme.
00113      *
00114      *  @param auth      The authentication scheme, chose from
00115      *                   NSAPI_SECURITY_NONE, NSAPI_SECURITY_PAP,
00116      *                   NSAPI_SECURITY_CHAP or NSAPI_SECURITY_UNKNOWN;
00117      *                   use NSAPI_SECURITY_UNKNOWN to try all of none,
00118      *                   PAP and CHAP.
00119      */
00120     virtual void set_authentication(nsapi_security_t auth);
00121 
00122     /** Set the cellular network credentials.
00123      *
00124      *  Please check documentation of connect() for default behaviour of APN settings.
00125      *
00126      *  @param apn      Access point name.
00127      *  @param uname    Optionally, user name.
00128      *  @param pwd      Optionally, password.
00129      */
00130     virtual void set_credentials(const char *apn, const char *uname = 0,
00131                                  const char *pwd = 0);
00132 
00133     /** Set the PIN code for the SIM card.
00134      *
00135      *  @param sim_pin      PIN for the SIM card.
00136      */
00137     virtual void set_sim_pin(const char *sim_pin);
00138 
00139     /** Connect to the cellular network and start the interface.
00140      *
00141      *  Attempts to connect to a cellular network.  Note: if init() has
00142      *  not been called beforehand, connect() will call it first.
00143      *
00144      *  @param sim_pin     PIN for the SIM card.
00145      *  @param apn         Optionally, access point name.
00146      *  @param uname       Optionally, user name.
00147      *  @param pwd         Optionally, password.
00148      *  @return            NSAPI_ERROR_OK on success, or negative error code on failure.
00149      */
00150     virtual nsapi_error_t connect(const char *sim_pin, const char *apn = 0,
00151                                   const char *uname = 0, const char *pwd = 0);
00152 
00153     /** Attempt to connect to the cellular network.
00154      *
00155      *  Brings up the network interface. Connects to the cellular radio
00156      *  network and then brings up IP stack on the cellular modem to be used
00157      *  indirectly via AT commands, rather than LWIP.  Note: if init() has
00158      *  not been called beforehand, connect() will call it first.
00159      *  NOTE: even a failed attempt to connect will cause the modem to remain
00160      *  powered up.  To power it down, call deinit().
00161      *
00162      *  For APN setup, default behaviour is to use 'internet' as APN string
00163      *  and assuming no authentication is required, i.e., user name and password
00164      *  are not set. Optionally, a database lookup can be requested by turning
00165      *  on the APN database lookup feature. The APN database is by no means
00166      *  exhaustive (feel free to submit a pull request with additional values).
00167      *  It contains a short list of some public APNs with publicly available
00168      *  user names and passwords (if required) in some particular countries only.
00169      *  Lookup is done using IMSI (International mobile subscriber identifier).
00170      *
00171      *  The preferred method is to setup APN using 'set_credentials()' API.
00172      *
00173      *  If you find that the AT interface returns "CONNECT" but shortly afterwards
00174      *  drops the connection then 99% of the time this will be because the APN
00175      *  is incorrect.
00176      *
00177      *  @return            0 on success, negative error code on failure.
00178      */
00179     virtual nsapi_error_t connect();
00180 
00181     /** Attempt to disconnect from the network.
00182      *
00183      *  Brings down the network interface.
00184      *  Does not bring down the Radio network.
00185      *
00186      *  @return            0 on success, negative error code on failure.
00187      */
00188     virtual nsapi_error_t disconnect();
00189 
00190     /** Adds or removes a SIM facility lock.
00191      *
00192      * Can be used to enable or disable SIM PIN check at device startup.
00193      *
00194      * @param set          Can be set to true if the SIM PIN check is supposed
00195      *                     to be enabled and vice versa.
00196      * @param immediate    If true, change the SIM PIN now, else set a flag
00197      *                     and make the change only when connect() is called.
00198      *                     If this is true and init() has not been called previously,
00199      *                     it will be called first.
00200      * @param sim_pin      The current SIM PIN, must be a const.  If this is not
00201      *                     provided, the SIM PIN must have previously been set by a
00202      *                     call to set_sim_pin().
00203      * @return             0 on success, negative error code on failure.
00204      */
00205     nsapi_error_t set_sim_pin_check(bool set, bool immediate = false,
00206                                     const char *sim_pin = NULL);
00207 
00208     /** Change the PIN for the SIM card.
00209      *
00210      * Provide the new PIN for your SIM card with this API.  It is ONLY possible to
00211      * change the SIM PIN when SIM PIN checking is ENABLED.
00212      *
00213      * @param new_pin    New PIN to be used in string format, must be a const.
00214      * @param immediate  If true, change the SIM PIN now, else set a flag
00215      *                   and make the change only when connect() is called.
00216      *                   If this is true and init() has not been called previously,
00217      *                   it will be called first.
00218      * @param old_pin    Old PIN, must be a const.  If this is not provided, the SIM PIN
00219      *                   must have previously been set by a call to set_sim_pin().
00220      * @return           0 on success, negative error code on failure.
00221      */
00222     nsapi_error_t set_new_sim_pin(const char *new_pin, bool immediate = false,
00223                                   const char *old_pin = NULL);
00224 
00225     /** Check if the connection is currently established or not.
00226      *
00227      * @return          True if connected to a data network, otherwise false.
00228      */
00229     virtual bool is_connected();
00230 
00231     /** Get the local IP address
00232      *
00233      *  @return         Null-terminated representation of the local IP address
00234      *                  or null if no IP address has been received.
00235      */
00236     virtual const char *get_ip_address();
00237 
00238     /** Get the local network mask.
00239      *
00240      *  @return         Null-terminated representation of the local network mask
00241      *                  or null if no network mask has been received.
00242      */
00243     virtual const char *get_netmask();
00244 
00245     /** Get the local gateways.
00246      *
00247      *  @return         Null-terminated representation of the local gateway
00248      *                  or null if no network mask has been received.
00249      */
00250     virtual const char *get_gateway();
00251 
00252     /** Call back in case connection is lost.
00253      *
00254      * @param cb     The function to call.
00255      */
00256     void connection_status_cb(Callback<void(nsapi_error_t)> cb);
00257 
00258 protected:
00259 
00260     /** Socket "unused" value.
00261      */
00262     #define SOCKET_UNUSED -1
00263 
00264     /** Socket timeout value in milliseconds.
00265      * Note: the sockets layer above will retry the
00266      * call to the functions here when they return NSAPI_ERROR_WOULD_BLOCK
00267      * and the user has set a larger timeout or full blocking.
00268      */
00269     #define SOCKET_TIMEOUT 1000
00270 
00271     /** The maximum number of bytes in a packet that can be written
00272      * to the AT interface in one go.
00273      */
00274     #define MAX_WRITE_SIZE 1024
00275 
00276     /** The maximum number of bytes in a packet that can be read from
00277      * from the AT interface in one go.
00278      */
00279     #define MAX_READ_SIZE 1024
00280 
00281     /** Management structure for sockets.
00282      */
00283     typedef struct {
00284         int modem_handle;  //!< The modem's handle for the socket.
00285         volatile nsapi_size_t pending; //!< The number of received bytes pending.
00286         void (*callback)(void *); //!< A callback for events.
00287         void *data; //!< A data pointer that must be passed to the callback.
00288     } SockCtrl;
00289 
00290     /** Sockets storage.
00291      */
00292     SockCtrl _sockets[7];
00293 
00294     /** Storage for a single IP address.
00295      */
00296     char *_ip;
00297 
00298     /** The APN to use.
00299      */
00300     const char *_apn;
00301 
00302     /** The user name to use.
00303      */
00304     const char *_uname;
00305 
00306     /** The password to use.
00307      */
00308     const char *_pwd;
00309 
00310     /** The type of authentication to use.
00311      */
00312     nsapi_security_t _auth;
00313 
00314     /** Get the next set of credentials from the database.
00315      */
00316     virtual void get_next_credentials(const char ** config);
00317 
00318     /** Activate one of the on-board modem's connection profiles.
00319      *
00320      * @param apn      The APN to use.
00321      * @param username The user name to use.
00322      * @param password The password to use.
00323      * @param auth     The authentication method to use
00324      *                 (NSAPI_SECURITY_NONE, NSAPI_SECURITY_PAP,
00325      *                 NSAPI_SECURITY_CHAP or NSAPI_SECURITY_UNKNOWN).
00326      * @return         True if successful, otherwise false.
00327      */
00328     virtual bool activate_profile(const char* apn, const char* username,
00329                                   const char* password, nsapi_security_t auth);
00330 
00331     /** Activate a profile using the existing external connection.
00332      *
00333      * @return true if successful, otherwise false.
00334      */
00335     virtual bool activate_profile_reuse_external(void);
00336 
00337     /** Activate a profile based on connection ID.
00338      *
00339      * @param cid       The connection ID.
00340      * @param apn       The APN to use.
00341      * @param username  The user name to use.
00342      * @param password  The password to use.
00343      * @param auth      The authentication method to use.
00344      * @return          True if successful, otherwise false.
00345      */
00346     virtual bool activate_profile_by_cid(int cid, const char* apn, const char* username,
00347                                          const char* password, nsapi_security_t auth);
00348 
00349     /** Connect the on board IP stack of the modem.
00350      *
00351      * @return         True if successful, otherwise false.
00352      */
00353     virtual bool connect_modem_stack();
00354 
00355     /** Disconnect the on board IP stack of the modem.
00356      *
00357      * @return         True if successful, otherwise false.
00358      */
00359     virtual bool disconnect_modem_stack();
00360 
00361     /** Provide access to the NetworkStack object
00362      *
00363      *  @return        The underlying NetworkStack object.
00364      */
00365     virtual NetworkStack *get_stack();
00366 
00367 protected:
00368 
00369     /** Open a socket.
00370      *
00371      *  Creates a network socket and stores it in the specified handle.
00372      *  The handle must be passed to following calls on the socket.
00373      *
00374      *  @param handle   Destination for the handle to a newly created socket.
00375      *  @param proto    Protocol of socket to open, NSAPI_TCP or NSAPI_UDP.
00376      *  @return         0 on success, negative error code on failure.
00377      */
00378     virtual nsapi_error_t socket_open(nsapi_socket_t *handle,
00379                                       nsapi_protocol_t proto);
00380 
00381     /** Close a socket.
00382      *
00383      *  Closes any open connection and deallocates any memory associated
00384      *  with the socket.
00385      *
00386      *  @param handle   Socket handle.
00387      *  @return         0 on success, negative error code on failure.
00388      */
00389     virtual nsapi_error_t socket_close(nsapi_socket_t handle);
00390 
00391     /** Bind a specific port to a socket.
00392      *
00393      *  Binding a socket specifies port on which to receive
00394      *  data. The IP address is ignored.  Note that binding
00395      *  a socket involves closing it and reopening and so the
00396      *  bind operation should be carried out before any others.
00397      *
00398      *  @param handle   Socket handle.
00399      *  @param address  Local address to bind (of which only the port is used).
00400      *  @return         0 on success, negative error code on failure.
00401      */
00402     virtual nsapi_error_t socket_bind(nsapi_socket_t handle,
00403                                       const SocketAddress &address);
00404 
00405     /** Connects TCP socket to a remote host.
00406      *
00407      *  Initiates a connection to a remote server specified by the
00408      *  indicated address.
00409      *
00410      *  @param handle   Socket handle.
00411      *  @param address  The SocketAddress of the remote host.
00412      *  @return         0 on success, negative error code on failure.
00413      */
00414     virtual nsapi_error_t socket_connect(nsapi_socket_t handle,
00415                                          const SocketAddress &address);
00416 
00417     /** Send data over a TCP socket.
00418      *
00419      *  The socket must be connected to a remote host. Returns the number of
00420      *  bytes sent from the buffer.  This class sets no upper buffer limit on
00421      *  buffer size and the maximum packet size is not connected with the
00422      *  platform.buffered-serial-txbuf-size/platform.buffered-serial-rxbuf-size
00423      *  definitions.
00424      *
00425      *  @param handle   Socket handle.
00426      *  @param data     Buffer of data to send to the host.
00427      *  @param size     Size of the buffer in bytes.
00428      *  @return         Number of sent bytes on success, negative error
00429      *                  code on failure.
00430      */
00431     virtual nsapi_size_or_error_t socket_send(nsapi_socket_t handle,
00432                                               const void *data, nsapi_size_t size);
00433 
00434     /** Send a packet over a UDP socket.
00435      *
00436      *  Sends data to the specified address. Returns the number of bytes
00437      *  sent from the buffer.
00438      *
00439      *  PACKET SIZES: the maximum packet size that can be sent in a single
00440      *  UDP packet is limited by the configuration value
00441      *  platform.buffered-serial-txbuf-size (defaults to 256).
00442      *  The maximum UDP packet size is:
00443      *
00444      *  platform.buffered-serial-txbuf-size - AT_PACKET_OVERHEAD
00445      *
00446      *  ...with a limit of 1024 bytes (at the AT interface). So, to allow sending
00447      *  of a 1024 byte UDP packet, edit your mbed_app.json to add a target override
00448      *  setting platform.buffered-serial-txbuf-size to 1101.  However, for
00449      *  UDP packets, 508 bytes is considered a more realistic size, taking into
00450      *  account fragmentation sizes over the public internet, which leads to a
00451      *  platform.buffered-serial-txbuf-size/platform.buffered-serial-rxbuf-size
00452      *  setting of 585.
00453      *
00454      *  If size is larger than this limit, the data will be split across separate
00455      *  UDP packets.
00456      *
00457      *  @param handle   Socket handle.
00458      *  @param address  The SocketAddress of the remote host.
00459      *  @param data     Buffer of data to send to the host.
00460      *  @param size     Size of the buffer in bytes.
00461      *  @return         Number of sent bytes on success, negative error
00462      *                  code on failure.
00463      */
00464     virtual nsapi_size_or_error_t socket_sendto(nsapi_socket_t handle,
00465                                                 const SocketAddress &address,
00466                                                 const void *data,
00467                                                 nsapi_size_t size);
00468 
00469     /** Receive data over a TCP socket.
00470      *
00471      *  The socket must be connected to a remote host. Returns the number of
00472      *  bytes received into the buffer.  This class sets no upper limit on the
00473      *  buffer size and the maximum packet size is not connected with the
00474      *  platform.buffered-serial-txbuf-size/platform.buffered-serial-rxbuf-size
00475      *  definitions.
00476      *
00477      *  @param handle   Socket handle.
00478      *  @param data     Destination buffer for data received from the host.
00479      *  @param size     Size of the buffer in bytes.
00480      *  @return         Number of received bytes on success, negative error
00481      *                  code on failure.
00482      */
00483     virtual nsapi_size_or_error_t socket_recv(nsapi_socket_t handle,
00484                                               void *data, nsapi_size_t size);
00485 
00486     /** Receive a packet over a UDP socket.
00487      *
00488      *  Receives data and stores the source address in address if address
00489      *  is not NULL. Returns the number of bytes received into the buffer.
00490      *
00491      *  PACKET SIZES: the maximum packet size that can be retrieved in a
00492      *  single call to this method is limited by the configuration value
00493      *  platform.buffered-serial-rxbuf-size (default 256).  The maximum
00494      *  UDP packet size is:
00495      *
00496      *  platform.buffered-serial-rxbuf-size - AT_PACKET_OVERHEAD
00497      *
00498      *  ...with a limit of 1024 (at the AT interface). So to allow reception of a
00499      *  1024 byte UDP packet in a single call, edit your mbed_app.json to add a
00500      *  target override setting platform.buffered-serial-rxbuf-size to 1101.
00501      *
00502      *  If the received packet is larger than this limit, any remainder will
00503      *  be returned in subsequent calls to this method.  Once a single UDP
00504      *  packet has been received, this method will return.
00505      *
00506      *  @param handle   Socket handle.
00507      *  @param address  Destination for the source address or NULL.
00508      *  @param data     Destination buffer for data received from the host.
00509      *  @param size     Size of the buffer in bytes.
00510      *  @return         Number of received bytes on success, negative error
00511      *                  code on failure.
00512      */
00513     virtual nsapi_size_or_error_t socket_recvfrom(nsapi_socket_t handle,
00514                                                   SocketAddress *address,
00515                                                   void *data, nsapi_size_t size);
00516 
00517     /** Register a callback on state change of the socket.
00518      *
00519      *  The specified callback will be called on state changes such as when
00520      *  the socket can recv/send/accept successfully and on when an error
00521      *  occurs. The callback may also be called spuriously without reason.
00522      *
00523      *  The callback may be called in an interrupt context and should not
00524      *  perform expensive operations such as recv/send calls.
00525      *
00526      *  @param handle   Socket handle.
00527      *  @param callback Function to call on state change.
00528      *  @param data     Argument to pass to callback.
00529      */
00530     virtual void socket_attach(nsapi_socket_t handle, void (*callback)(void *),
00531                                void *data);
00532 
00533     /** Listen for connections on a TCP socket.
00534      *
00535      *  Marks the socket as a passive socket that can be used to accept
00536      *  incoming connections.
00537      *
00538      *  @param handle   Socket handle.
00539      *  @param backlog  Number of pending connections that can be queued
00540      *                  simultaneously, defaults to 1.
00541      *  @return         0 on success, negative error code on failure.
00542      */
00543     virtual nsapi_error_t socket_listen(nsapi_socket_t handle, int backlog);
00544 
00545     /** Accepts a connection on a TCP socket.
00546      *
00547      *  The server socket must be bound and set to listen for connections.
00548      *  On a new connection, creates a network socket and stores it in the
00549      *  specified handle. The handle must be passed to following calls on
00550      *  the socket.
00551      *
00552      *  A stack may have a finite number of sockets, in this case
00553      *  NSAPI_ERROR_NO_SOCKET is returned if no socket is available.
00554      *
00555      *  This call is non-blocking. If accept would block,
00556      *  NSAPI_ERROR_WOULD_BLOCK is returned immediately.
00557      *
00558      *  @param server   Socket handle to server to accept from.
00559      *  @param handle   Destination for a handle to the newly created socket.
00560      *  @param address  Destination for the remote address or NULL.
00561      *  @return         0 on success, negative error code on failure.
00562      */
00563     virtual nsapi_error_t socket_accept(nsapi_socket_t server,
00564                                         nsapi_socket_t *handle,
00565                                         SocketAddress *address = 0);
00566 
00567     /**  Set stack-specific socket options.
00568      *
00569      *  The setsockopt allow an application to pass stack-specific hints
00570      *  to the underlying stack. For unsupported options,
00571      *  NSAPI_ERROR_UNSUPPORTED is returned and the socket is unmodified.
00572      *
00573      *  @param handle   Socket handle.
00574      *  @param level    Stack-specific protocol level.
00575      *  @param optname  Stack-specific option identifier.
00576      *  @param optval   Option value.
00577      *  @param optlen   Length of the option value.
00578      *  @return         0 on success, negative error code on failure.
00579      */
00580     virtual nsapi_error_t setsockopt(nsapi_socket_t handle, int level,
00581                                      int optname, const void *optval,
00582                                      unsigned optlen);
00583 
00584     /**  Get stack-specific socket options.
00585      *
00586      *  The getstackopt allow an application to retrieve stack-specific hints
00587      *  from the underlying stack. For unsupported options,
00588      *  NSAPI_ERROR_UNSUPPORTED is returned and optval is unmodified.
00589      *
00590      *  @param handle   Socket handle.
00591      *  @param level    Stack-specific protocol level.
00592      *  @param optname  Stack-specific option identifier.
00593      *  @param optval   Destination for option value.
00594      *  @param optlen   Length of the option value.
00595      *  @return         0 on success, negative error code on failure.
00596      */
00597     virtual nsapi_error_t getsockopt(nsapi_socket_t handle, int level,
00598                                      int optname, void *optval,
00599                                      unsigned *optlen);
00600 
00601 private:
00602 
00603     // u_ added to namespace us somewhat as this darned macro
00604     // is defined by everyone and their dog
00605     #define u_stringify(a) str(a)
00606     #define str(a) #a
00607 
00608     bool _sim_pin_check_change_pending;
00609     bool _sim_pin_check_change_pending_enabled_value;
00610     bool _sim_pin_change_pending;
00611     const char *_sim_pin_change_pending_new_pin_value;
00612     Thread event_thread;
00613     volatile bool _run_event_thread;
00614     void handle_event();
00615     SockCtrl * find_socket(int modem_handle = SOCKET_UNUSED);
00616     void clear_socket(SockCtrl * socket);
00617     bool check_socket(SockCtrl * socket);
00618     int nsapi_security_to_modem_security(nsapi_security_t nsapi_security);
00619     Callback<void(nsapi_error_t)> _connection_status_cb;
00620     void UUSORD_URC();
00621     void UUSORF_URC();
00622     void UUSOCL_URC();
00623     void UUPSDD_URC();
00624 };
00625 
00626 #endif // _UBLOX_AT_CELLULAR_INTERFACE_
00627