/* ESP8266 implementation of NetworkInterfaceAPI * Copyright (c) 2015 ARM Limited * * 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 && defined(MBED_CONF_EVENTS_PRESENT) && defined(MBED_CONF_NSAPI_PRESENT) && defined(MBED_CONF_RTOS_PRESENT) #include "drivers/DigitalOut.h" #include "ESP8266/ESP8266.h" #include "events/EventQueue.h" #include "events/mbed_shared_queues.h" #include "features/netsocket/NetworkInterface.h" #include "features/netsocket/NetworkStack.h" #include "features/netsocket/nsapi_types.h" #include "features/netsocket/SocketAddress.h" #include "features/netsocket/WiFiAccessPoint.h" #include "features/netsocket/WiFiInterface.h" #include "platform/Callback.h" #include "rtos/ConditionVariable.h" #include "rtos/Mutex.h" #define ESP8266_SOCKET_COUNT 5 #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 */ /** 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); /** * @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. * * @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); /** 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 const char *get_ip_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 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 const char *get_netmask(); /** Gets the current radio signal strength for active connection * * @return Connection strength in dBm (negative value) */ virtual int8_t get_rssi(); /** 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 timeout Timeout in milliseconds; 0 for no timeout (Default: 0) * @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); /** 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 */ using NetworkInterface::gethostbyname; /** 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 */ using NetworkInterface::add_dns_server; /** @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 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); private: // AT layer ESP8266 _esp; void update_conn_state_cb(); // 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; // 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; bool _if_blocking; // NetworkInterface, blocking or not rtos::ConditionVariable _if_connected; // connect status reporting nsapi_error_t _conn_status_to_error(); // 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; bool _get_firmware_ok(); nsapi_error_t _init(void); void _hw_reset(); nsapi_error_t _connect_retval; //sigio struct { void (*callback)(void *); void *data; } _cbs[ESP8266_SOCKET_COUNT]; void event(); // Connection state reporting to application nsapi_connection_status_t _conn_stat; mbed::Callback _conn_stat_cb; // Background OOB processing // Use global EventQueue events::EventQueue *_global_event_queue; int _oob_event_id; int _connect_event_id; void proc_oob_evnt(); void _oob2global_event_queue(); void _connect_async(); rtos::Mutex _cmutex; // Protect asynchronous connection logic }; #endif #endif