Mbed OS Reference | ESP8266Interface.h Source File

 /* ESP8266 implementation of NetworkInterfaceAPI
  * 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 ESP8266_INTERFACE_H
 #define ESP8266_INTERFACE_H
 
 #if DEVICE_SERIAL && DEVICE_INTERRUPTIN && defined(MBED_CONF_EVENTS_PRESENT) && defined(MBED_CONF_NSAPI_PRESENT) && defined(MBED_CONF_RTOS_API_PRESENT)
 #include "drivers/DigitalOut.h"
 #include "drivers/Timer.h"
 #include "ESP8266/ESP8266.h"
 #include "events/EventQueue.h"
 #include "events/mbed_shared_queues.h"
 #include "netsocket/NetworkInterface.h"
 #include "netsocket/NetworkStack.h"
 #include "netsocket/nsapi_types.h"
 #include "netsocket/SocketAddress.h"
 #include "netsocket/WiFiAccessPoint.h"
 #include "netsocket/WiFiInterface.h"
 #include "platform/Callback.h"
 #include "platform/mbed_chrono.h"
 #if MBED_CONF_RTOS_PRESENT
 #include "rtos/ConditionVariable.h"
 #endif
 #include "rtos/Mutex.h"
 
 #define ESP8266_SOCKET_COUNT 5
 
 #define ESP8266_INTERFACE_CONNECT_INTERVAL 5s
 #define ESP8266_INTERFACE_CONNECT_TIMEOUT (2 * ESP8266_CONNECT_TIMEOUT + ESP8266_INTERFACE_CONNECT_INTERVAL)
 
 #ifdef TARGET_FF_ARDUINO
 #ifndef MBED_CONF_ESP8266_TX
 #define MBED_CONF_ESP8266_TX D1
 #endif
 
 #ifndef MBED_CONF_ESP8266_RX
 #define MBED_CONF_ESP8266_RX D0
 #endif
 #endif /* TARGET_FF_ARDUINO */
 
 #ifndef MBED_CONF_ESP8266_COUNTRY_CODE
 #define MBED_CONF_ESP8266_COUNTRY_CODE "CN"
 #endif
 
 #ifndef MBED_CONF_ESP8266_CHANNEL_START
 #define MBED_CONF_ESP8266_CHANNEL_START 1
 #endif
 
 #ifndef MBED_CONF_ESP8266_CHANNELS
 #define MBED_CONF_ESP8266_CHANNELS 13
 #endif
 
 /** ESP8266Interface class
  *  Implementation of the NetworkStack for the ESP8266
  */
 class ESP8266Interface : public NetworkStack, public WiFiInterface {
 public:
 #if defined MBED_CONF_ESP8266_TX && defined MBED_CONF_ESP8266_RX
     /**
      * @brief ESP8266Interface default constructor
      *        Will use values defined in mbed_lib.json
      */
     ESP8266Interface();
 #endif
 
     /** ESP8266Interface lifetime
      * @param tx        TX pin
      * @param rx        RX pin
      * @param debug     Enable debugging
      */
     ESP8266Interface(PinName tx, PinName rx, bool debug = false, PinName rts = NC, PinName cts = NC, PinName rst = NC, PinName pwr = NC);
 
     /**
      * @brief ESP8266Interface default destructor
      */
     virtual ~ESP8266Interface();
 
     /** Start the interface
      *
      *  Attempts to connect to a WiFi network. Requires ssid and passphrase to be set.
      *  If passphrase is invalid, NSAPI_ERROR_AUTH_ERROR is returned.
      *
      *  @return         0 on success, negative error code on failure
      */
     virtual int connect();
 
     /** Start the interface
      *
      *  Attempts to connect to a WiFi network.
      *
      *  If interface is configured blocking it will timeout after up to
      *  ESP8266_INTERFACE_CONNECT_TIMEOUT_MS + ESP8266_CONNECT_TIMEOUT ms.
      *
      *  @param ssid      Name of the network to connect to
      *  @param pass      Security passphrase to connect to the network
      *  @param security  Type of encryption for connection (Default: NSAPI_SECURITY_NONE)
      *  @param channel   This parameter is not supported, setting it to anything else than 0 will result in NSAPI_ERROR_UNSUPPORTED
      *  @return          0 on success, or error code on failure
      */
     virtual int connect(const char *ssid, const char *pass, nsapi_security_t security = NSAPI_SECURITY_NONE,
                         uint8_t channel = 0);
 
     /** Set the WiFi network credentials
      *
      *  @param ssid      Name of the network to connect to
      *  @param pass      Security passphrase to connect to the network
      *  @param security  Type of encryption for connection
      *                   (defaults to NSAPI_SECURITY_NONE)
      *  @return          0 on success, or error code on failure
      */
     virtual int set_credentials(const char *ssid, const char *pass, nsapi_security_t security = NSAPI_SECURITY_NONE);
 
     /** Set the WiFi network channel - NOT SUPPORTED
      *
      * This function is not supported and will return NSAPI_ERROR_UNSUPPORTED
      *
      *  @param channel   Channel on which the connection is to be made, or 0 for any (Default: 0)
      *  @return          Not supported, returns NSAPI_ERROR_UNSUPPORTED
      */
     virtual int set_channel(uint8_t channel);
 
     /** @copydoc NetworkInterface::set_network */
     virtual nsapi_error_t set_network(const SocketAddress &ip_address, const SocketAddress &netmask, const SocketAddress &gateway);
 
     /** @copydoc NetworkInterface::dhcp */
     virtual nsapi_error_t set_dhcp(bool dhcp);
 
     /** Stop the interface
      *  @return             0 on success, negative on failure
      */
     virtual int disconnect();
 
     /** Get the internally stored IP address
      *  @return             IP address of the interface or null if not yet connected
      */
     virtual nsapi_error_t get_ip_address(SocketAddress *address);
 
     /** Get the internally stored MAC address
      *  @return             MAC address of the interface
      */
     virtual const char *get_mac_address();
 
     /** Get the local gateway
     *
     *  @return         Null-terminated representation of the local gateway
     *                  or null if no network mask has been recieved
     */
     virtual nsapi_error_t get_gateway(SocketAddress *address);
 
     MBED_DEPRECATED_SINCE("mbed-os-5.15", "String-based APIs are deprecated")
     virtual const char *get_gateway();
 
     /** Get the local network mask
      *
      *  @return         Null-terminated representation of the local network mask
      *                  or null if no network mask has been recieved
      */
     virtual nsapi_error_t get_netmask(SocketAddress *address);
 
     MBED_DEPRECATED_SINCE("mbed-os-5.15", "String-based APIs are deprecated")
     virtual const char *get_netmask();
 
     /** Get the current time.
      *
      *  @retval          NSAPI_ERROR_UNSUPPORTED if the function is not supported
      *  @retval          NSAPI_ERROR_OK on success
      *
      *  @note esp8266.sntp-enable must be set to true in mbed_app.json.
      */
     nsapi_error_t get_time(std::tm *t);
 
     /** Get the network interface name
      *
      *  @return         Null-terminated representation of the network interface name
      *                  or null if interface not exists
      */
     virtual char *get_interface_name(char *interface_name);
 
     /** Gets the current radio signal strength for active connection
      *
      * @return          Connection strength in dBm (negative value)
      */
     virtual int8_t get_rssi();
 
     /** Scan mode
      */
     enum scan_mode {
         SCANMODE_ACTIVE, /*!< active mode */
         SCANMODE_PASSIVE /*!< passive mode */
     };
 
     /** Scan for available networks
      *
      * This function will block.
      *
      * @param  ap    Pointer to allocated array to store discovered AP
      * @param  count Size of allocated @a res array, or 0 to only count available AP
      * @return       Number of entries in @a, or if @a count was 0 number of available networks, negative on error
      *               see @a nsapi_error
      */
     virtual int scan(WiFiAccessPoint *res, unsigned count);
 
     /** Scan for available networks
      *
      * This function will block.
      *
      * @param  ap    Pointer to allocated array to store discovered AP
      * @param  count Size of allocated @a res array, or 0 to only count available AP
      * @param  t_max Scan time for each channel - 0-1500ms. If 0 - uses default value
      * @param  t_min Minimum for each channel in active mode - 0-1500ms. If 0 - uses default value. Omit in passive mode
      * @return       Number of entries in @a, or if @a count was 0 number of available networks, negative on error
      *               see @a nsapi_error
      */
     virtual int scan(WiFiAccessPoint *res, unsigned count, scan_mode mode = SCANMODE_PASSIVE,
                      mbed::chrono::milliseconds_u32 t_max = mbed::chrono::milliseconds_u32(0),
                      mbed::chrono::milliseconds_u32 t_min = mbed::chrono::milliseconds_u32(0));
 
     /** Translates a hostname to an IP address with specific version
      *
      *  The hostname may be either a domain name or an IP address. If the
      *  hostname is an IP address, no network transactions will be performed.
      *
      *  If no stack-specific DNS resolution is provided, the hostname
      *  will be resolve using a UDP socket on the stack.
      *
      *  @param address  Destination for the host SocketAddress
      *  @param host     Hostname to resolve
      *  @param version  IP version of address to resolve, NSAPI_UNSPEC indicates
      *                  version is chosen by the stack (defaults to NSAPI_UNSPEC)
      *  @return         0 on success, negative error code on failure
      */
 #if MBED_CONF_ESP8266_BUILT_IN_DNS
     nsapi_error_t gethostbyname(const char *name, SocketAddress *address, nsapi_version_t version, const char *interface_name);
 #else
     using NetworkInterface::gethostbyname;
 #endif
 
     using NetworkInterface::gethostbyname_async;
     using NetworkInterface::gethostbyname_async_cancel;
 
     /** Add a domain name server to list of servers to query
      *
      *  @param addr     Destination for the host address
      *  @return         0 on success, negative error code on failure
      */
 #if MBED_CONF_ESP8266_BUILT_IN_DNS
     nsapi_error_t add_dns_server(const SocketAddress &address, const char *interface_name);
 #else
     using NetworkInterface::add_dns_server;
 #endif
 
     /** @copydoc NetworkStack::setsockopt
      */
     virtual nsapi_error_t setsockopt(nsapi_socket_t handle, int level,
                                      int optname, const void *optval, unsigned optlen);
 
     /** @copydoc NetworkStack::getsockopt
      */
     virtual nsapi_error_t getsockopt(nsapi_socket_t handle, int level, int optname,
                                      void *optval, unsigned *optlen);
 
     /** Register callback for status reporting
      *
      *  The specified status callback function will be called on status changes
      *  on the network. The parameters on the callback are the event type and
      *  event-type dependent reason parameter.
      *
      *  In ESP8266 the callback will be called when processing OOB-messages via
      *  AT-parser. Do NOT call any ESP8266Interface -functions or do extensive
      *  processing in the callback.
      *
      *  @param status_cb The callback for status changes
      */
     virtual void attach(mbed::Callback<void(nsapi_event_t, intptr_t)> status_cb);
 
     /** Get the connection status
      *
      *  @return         The connection status according to ConnectionStatusType
      */
     virtual nsapi_connection_status_t get_connection_status() const;
 
 protected:
     /** Open a socket
      *  @param handle       Handle in which to store new socket
      *  @param proto        Type of socket to open, NSAPI_TCP or NSAPI_UDP
      *  @return             0 on success, negative on failure
      */
     virtual int socket_open(void **handle, nsapi_protocol_t proto);
 
     /** Close the socket
      *  @param handle       Socket handle
      *  @return             0 on success, negative on failure
      *  @note On failure, any memory associated with the socket must still
      *        be cleaned up
      */
     virtual int socket_close(void *handle);
 
     /** Bind a server socket to a specific port
      *  @param handle       Socket handle
      *  @param address      Local address to listen for incoming connections on
      *  @return             0 on success, negative on failure.
      */
     virtual int socket_bind(void *handle, const SocketAddress &address);
 
     /** Start listening for incoming connections
      *  @param handle       Socket handle
      *  @param backlog      Number of pending connections that can be queued up at any
      *                      one time [Default: 1]
      *  @return             0 on success, negative on failure
      */
     virtual int socket_listen(void *handle, int backlog);
 
     /** Connects this TCP socket to the server
      *  @param handle       Socket handle
      *  @param address      SocketAddress to connect to
      *  @return             0 on success, negative on failure
      */
     virtual int socket_connect(void *handle, const SocketAddress &address);
 
     /** Accept a new connection.
      *  @param handle       Handle in which to store new socket
      *  @param server       Socket handle to server to accept from
      *  @return             0 on success, negative on failure
      *  @note This call is not-blocking, if this call would block, must
      *        immediately return NSAPI_ERROR_WOULD_WAIT
      */
     virtual int socket_accept(void *handle, void **socket, SocketAddress *address);
 
     /** Send data to the remote host
      *  @param handle       Socket handle
      *  @param data         The buffer to send to the host
      *  @param size         The length of the buffer to send
      *  @return             Number of written bytes on success, negative on failure
      *  @note This call is not-blocking, if this call would block, must
      *        immediately return NSAPI_ERROR_WOULD_WAIT
      */
     virtual int socket_send(void *handle, const void *data, unsigned size);
 
     /** Receive data from the remote host
      *  @param handle       Socket handle
      *  @param data         The buffer in which to store the data received from the host
      *  @param size         The maximum length of the buffer
      *  @return             Number of received bytes on success, negative on failure
      *  @note This call is not-blocking, if this call would block, must
      *        immediately return NSAPI_ERROR_WOULD_WAIT
      */
     virtual int socket_recv(void *handle, void *data, unsigned size);
 
     /** Send a packet to a remote endpoint
      *  @param handle       Socket handle
      *  @param address      The remote SocketAddress
      *  @param data         The packet to be sent
      *  @param size         The length of the packet to be sent
      *  @return             The number of written bytes on success, negative on failure
      *  @note This call is not-blocking, if this call would block, must
      *        immediately return NSAPI_ERROR_WOULD_WAIT
      */
     virtual int socket_sendto(void *handle, const SocketAddress &address, const void *data, unsigned size);
 
     /** Receive a packet from a remote endpoint
      *  @param handle       Socket handle
      *  @param address      Destination for the remote SocketAddress or null
      *  @param buffer       The buffer for storing the incoming packet data
      *                      If a packet is too long to fit in the supplied buffer,
      *                      excess bytes are discarded
      *  @param size         The length of the buffer
      *  @return             The number of received bytes on success, negative on failure
      *  @note This call is not-blocking, if this call would block, must
      *        immediately return NSAPI_ERROR_WOULD_WAIT
      */
     virtual int socket_recvfrom(void *handle, SocketAddress *address, void *buffer, unsigned size);
 
     /** Register a callback on state change of the socket
      *  @param handle       Socket handle
      *  @param callback     Function to call on state change
      *  @param data         Argument to pass to callback
      *  @note Callback may be called in an interrupt context.
      */
     virtual void socket_attach(void *handle, void (*callback)(void *), void *data);
 
     /** Provide access to the NetworkStack object
      *
      *  @return The underlying NetworkStack object
      */
     virtual NetworkStack *get_stack()
     {
         return this;
     }
 
     /** Set blocking status of connect() which by default should be blocking.
      *
      *  @param blocking Use true to make connect() blocking.
      *  @return         NSAPI_ERROR_OK on success, negative error code on failure.
      */
     virtual nsapi_error_t set_blocking(bool blocking);
 
     /** Set country code
      *
      *  @param track_ap      if TRUE, use country code used by the AP ESP is connected to,
      *                       otherwise uses country_code always
      *  @param country_code  ISO 3166-1 coded, 2 character alphanumeric country code assumed
      *  @param len           Length of the country code
      *  @param channel_start The channel number to start at
      *  @param channel       Number of channels
      *  @return              NSAPI_ERROR_OK on success, negative error code on failure.
      */
     nsapi_error_t set_country_code(bool track_ap, const char *country_code, int len, int channel_start, int channels);
 
 private:
     // AT layer
     ESP8266 _esp;
     void refresh_conn_state_cb();
 
     /** Status of software connection
      */
     typedef enum esp_connection_software_status {
         IFACE_STATUS_DISCONNECTED = 0,
         IFACE_STATUS_CONNECTING = 1,
         IFACE_STATUS_CONNECTED = 2,
         IFACE_STATUS_DISCONNECTING = 3
     } esp_connection_software_status_t;
 
     // HW reset pin
     class ResetPin {
     public:
         ResetPin(PinName rst_pin);
         void rst_assert();
         void rst_deassert();
         bool is_connected();
     private:
         mbed::DigitalOut  _rst_pin;
     } _rst_pin;
 
     // HW power pin
     class PowerPin {
     public:
         PowerPin(PinName pwr_pin);
         void power_on();
         void power_off();
         bool is_connected();
     private:
         mbed::DigitalOut  _pwr_pin;
     } _pwr_pin;
 
     /** Assert the reset and power pins
      *  ESP8266 has two pins serving similar purpose and this function asserts them both
      *  if they are configured in mbed_app.json.
      */
     void _power_off();
 
     // Credentials
     static const int ESP8266_SSID_MAX_LENGTH = 32; /* 32 is what 802.11 defines as longest possible name */
     char ap_ssid[ESP8266_SSID_MAX_LENGTH + 1]; /* The longest possible name; +1 for the \0 */
     static const int ESP8266_PASSPHRASE_MAX_LENGTH = 63; /* The longest allowed passphrase */
     static const int ESP8266_PASSPHRASE_MIN_LENGTH = 8; /* The shortest allowed passphrase */
     char ap_pass[ESP8266_PASSPHRASE_MAX_LENGTH + 1]; /* The longest possible passphrase; +1 for the \0 */
     nsapi_security_t _ap_sec;
 
     // Country code
     struct _channel_info {
         bool track_ap; // Set country code based on the AP ESP is connected to
         char country_code[4]; // ISO 3166-1 coded, 2-3 character alphanumeric country code - +1 for the '\0' - assumed. Documentation doesn't tell.
         int channel_start;
         int channels;
     };
     struct _channel_info _ch_info;
 
     bool _if_blocking; // NetworkInterface, blocking or not
 #if MBED_CONF_RTOS_PRESENT
     rtos::ConditionVariable _if_connected;
 #endif
 
     // connect status reporting
     nsapi_error_t _conn_status_to_error();
     mbed::Timer _conn_timer;
 
     // Drivers's socket info
     struct _sock_info {
         bool open;
         uint16_t sport;
     };
     struct _sock_info _sock_i[ESP8266_SOCKET_COUNT];
 
     // Driver's state
     int _initialized;
     nsapi_error_t _connect_retval;
     nsapi_error_t _disconnect_retval;
     bool _get_firmware_ok();
     nsapi_error_t _init(void);
     nsapi_error_t _reset();
 
     //sigio
     struct {
         void (*callback)(void *);
         void *data;
         uint8_t deferred;
     } _cbs[ESP8266_SOCKET_COUNT];
     void event();
     void event_deferred();
 
     // Connection state reporting to application
     nsapi_connection_status_t _conn_stat;
     mbed::Callback<void(nsapi_event_t, intptr_t)> _conn_stat_cb;
 
     // Background OOB processing
     // Use global EventQueue
     events::EventQueue *_global_event_queue;
     int _oob_event_id;
     int _connect_event_id;
     int _disconnect_event_id;
     void proc_oob_evnt();
     void _connect_async();
     void _disconnect_async();
     rtos::Mutex _cmutex; // Protect asynchronous connection logic
     esp_connection_software_status_t _software_conn_stat;
     bool _dhcp;
 
 };
 #endif
 #endif
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