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Diff: components/wifi/esp8266-driver/ESP8266Interface.h
- Revision:
- 2:7aab896b1a3b
diff -r 7bcfbc328423 -r 7aab896b1a3b components/wifi/esp8266-driver/ESP8266Interface.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/components/wifi/esp8266-driver/ESP8266Interface.h Wed Mar 13 11:03:24 2019 +0000 @@ -0,0 +1,322 @@ +/* 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 + +#include "mbed.h" +#include "ESP8266.h" + + +#define ESP8266_SOCKET_COUNT 5 + +/** ESP8266Interface class + * Implementation of the NetworkStack for the ESP8266 + */ +class ESP8266Interface : public NetworkStack, public WiFiInterface +{ +public: + /** + * @brief ESP8266Interface default constructor + * Will use values defined in mbed_lib.json + */ + ESP8266Interface(); + + /** ESP8266Interface lifetime + * @param tx TX pin + * @param rx RX pin + * @param debug Enable debugging + */ + ESP8266Interface(PinName tx, PinName rx, bool debug = false); + + /** 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<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; + } + +private: + static const int ESP8266_SSID_MAX_LENGTH = 32; /* 32 is what 802.11 defines as longest possible name */ + static const int ESP8266_PASSPHRASE_MAX_LENGTH = 63; /* The longest allowed passphrase */ + static const int ESP8266_PASSPHRASE_MIN_LENGTH = 8; /* The shortest allowed passphrase */ + + ESP8266 _esp; + bool _ids[ESP8266_SOCKET_COUNT]; + int _initialized; + int _started; + + char ap_ssid[ESP8266_SSID_MAX_LENGTH + 1]; /* 32 is what 802.11 defines as longest possible name; +1 for the \0 */ + nsapi_security_t ap_sec; + uint8_t ap_ch; + char ap_pass[ESP8266_PASSPHRASE_MAX_LENGTH + 1]; + uint16_t _local_ports[ESP8266_SOCKET_COUNT]; + + bool _disable_default_softap(); + void event(); + bool _get_firmware_ok(); + nsapi_error_t _init(void); + nsapi_error_t _startup(const int8_t wifi_mode); + + struct { + void (*callback)(void *); + void *data; + } _cbs[ESP8266_SOCKET_COUNT]; +}; + +#endif