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