Mbed OS Reference | ESP8266.h Source File

 /* ESP8266Interface Example
  * 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_H
 #define ESP8266_H
 
 #if DEVICE_SERIAL && DEVICE_INTERRUPTIN && defined(MBED_CONF_EVENTS_PRESENT) && defined(MBED_CONF_NSAPI_PRESENT) && defined(MBED_CONF_RTOS_API_PRESENT)
 #include <stdint.h>
 #include <ctime>
 
 #include "drivers/BufferedSerial.h"
 #include "netsocket/nsapi_types.h"
 #include "netsocket/WiFiAccessPoint.h"
 #include "PinNames.h"
 #include "platform/ATCmdParser.h"
 #include "platform/Callback.h"
 #include "platform/mbed_chrono.h"
 #include "platform/mbed_error.h"
 #include "rtos/Mutex.h"
 #include "rtos/ThisThread.h"
 #include "netsocket/SocketAddress.h"
 
 // Various timeouts for different ESP8266 operations
 // (some of these can't use literal form as they're needed for defaults in this header, where
 // we shouldn't add a using directive for them. Defines only used in the C++ file can use literals).
 #ifndef ESP8266_CONNECT_TIMEOUT
 #define ESP8266_CONNECT_TIMEOUT 15s
 #endif
 #ifndef ESP8266_SEND_TIMEOUT
 #define ESP8266_SEND_TIMEOUT    2s
 #endif
 #ifndef ESP8266_RECV_TIMEOUT
 #define ESP8266_RECV_TIMEOUT    std::chrono::seconds(2)
 #endif
 #ifndef ESP8266_MISC_TIMEOUT
 #define ESP8266_MISC_TIMEOUT    std::chrono::seconds(2)
 #endif
 #ifndef ESP8266_DNS_TIMEOUT
 #define ESP8266_DNS_TIMEOUT     15s
 #endif
 
 #define ESP8266_SCAN_TIME_MIN 0ms
 #define ESP8266_SCAN_TIME_MAX 1500ms
 #define ESP8266_SCAN_TIME_MIN_DEFAULT 120ms
 #define ESP8266_SCAN_TIME_MAX_DEFAULT 360ms
 
 // Firmware version
 #define ESP8266_SDK_VERSION 2000000
 #define ESP8266_SDK_VERSION_MAJOR ESP8266_SDK_VERSION/1000000
 
 #define ESP8266_AT_VERSION 1000000
 #define ESP8266_AT_VERSION_MAJOR ESP8266_AT_VERSION/1000000
 #define ESP8266_AT_VERSION_TCP_PASSIVE_MODE 1070000
 #define ESP8266_AT_VERSION_WIFI_SCAN_CHANGE 1060000
 
 #define FW_AT_LEAST_VERSION(MAJOR,MINOR,PATCH,NUSED/*Not used*/,REF) \
     (((MAJOR)*1000000+(MINOR)*10000+(PATCH)*100) >= REF ? true : false)
 
 struct esp8266_socket {
     int id;
     nsapi_protocol_t proto;
     bool connected;
     bool bound;
     SocketAddress addr;
     int keepalive; // TCP
 };
 
 /** ESP8266Interface class.
     This is an interface to a ESP8266 radio.
  */
 class ESP8266 {
 public:
     ESP8266(PinName tx, PinName rx, bool debug = false, PinName rts = NC, PinName cts = NC);
 
     /**
     * ESP8266 firmware SDK version
     *
     * @param major Major version number
     * @param minor Minor version number
     * @param patch Patch version number
     */
     struct fw_sdk_version {
         int major;
         int minor;
         int patch;
         fw_sdk_version(int major, int minor, int patch) : major(major), minor(minor), patch(patch) {}
     };
 
     /**
     * ESP8266 firmware AT version
     *
     * @param major Major version number
     * @param minor Minor version number
     * @param patch Patch version number
     */
     struct fw_at_version {
         int major;
         int minor;
         int patch;
         fw_at_version(int major, int minor, int patch) : major(major), minor(minor), patch(patch) {}
     };
 
     /**
     * Check AT command interface of ESP8266
     *
     * @return true if ready to respond on AT commands
     */
     bool at_available(void);
 
     /**
      * Disable echo - required for OOB processing to work
      *
      * @return true if echo was successfully disabled
      */
     bool echo_off(void);
 
     /**
     * Check sdk version from which firmware is created
     *
     * @return fw_sdk_version which tells major, minor and patch version
     */
     struct fw_sdk_version sdk_version(void);
 
     /**
     * Check AT instruction set version from which firmware is created
     *
     * @return fw_at_version which tells major, minor and patch version
     */
     struct fw_at_version at_version(void);
 
     /**
     * Startup the ESP8266
     *
     * @param mode mode of WIFI 1-client, 2-host, 3-both
     * @return true only if ESP8266 was setup correctly
     */
     bool startup(int mode);
 
     /**
     * Reset ESP8266
     *
     * @return true only if ESP8266 resets successfully
     */
     bool reset(void);
 
     /**
     * Enable/Disable DHCP
     *
     * @param enabled DHCP enabled when true
     * @param mode mode of DHCP 0-softAP, 1-station, 2-both
     * @return true only if ESP8266 enables/disables DHCP successfully
     */
     bool dhcp(bool enabled, int mode);
 
     /**
     * Connect ESP8266 to AP
     *
     * @param ap the name of the AP
     * @param passPhrase the password of AP
     * @return NSAPI_ERROR_OK in success, negative error code in failure
     */
     nsapi_error_t connect(const char *ap, const char *passPhrase);
 
     /**
     * Disconnect ESP8266 from AP
     *
     * @return true only if ESP8266 is disconnected successfully
     */
     bool disconnect(void);
 
     /**
     * Enable or disable Remote IP and Port printing with +IPD
     *
     * @param enable, 1 on, 0 off
     * @return true only if ESP8266 is disconnected successfully
     */
     bool ip_info_print(int enable);
 
     /**
     * Get the IP address of ESP8266
     *
     * @return null-teriminated IP address or null if no IP address is assigned
     */
     const char *ip_addr(void);
 
     /**
      * Set static IP address, gateway and netmask
      *
      * @param ip IP address to set
      * @param gateway (optional) gateway to set
      * @param netmask (optional) netmask to set
      *
      * @return true if operation was successful and flase otherwise
      */
     bool set_ip_addr(const char *ip, const char *gateway, const char *netmask);
 
     /**
     * Get the MAC address of ESP8266
     *
     * @return null-terminated MAC address or null if no MAC address is assigned
     */
     const char *mac_addr(void);
 
     /** Get the local gateway
     *
     *  @return         Null-terminated representation of the local gateway
     *                  or null if no network mask has been recieved
     */
     const char *gateway();
 
     /** Get the local network mask
      *
      *  @return         Null-terminated representation of the local network mask
      *                  or null if no network mask has been recieved
      */
     const char *netmask();
 
     /* Return RSSI for active connection
      *
      * @return      Measured RSSI
      */
     int8_t rssi();
 
     /** Scan mode
      */
     enum scan_mode {
         SCANMODE_ACTIVE = 0, /*!< active mode */
         SCANMODE_PASSIVE = 1 /*!< passive mode */
     };
 
     /** Scan for available networks
      *
      * @param  ap    Pointer to allocated array to store discovered AP
      * @param  limit Size of allocated @a res array, or 0 to only count available AP
      * @param  t_max Maximum scan time per channel
      * @param  t_min Minimum scan time per channel in active mode, can be omitted in passive mode
      * @return       Number of entries in @a res, or if @a count was 0 number of available networks, negative on error
      *               see @a nsapi_error
      */
     int scan(WiFiAccessPoint *res, unsigned limit, scan_mode mode,
              std::chrono::duration<unsigned, std::milli> t_max,
              std::chrono::duration<unsigned, std::milli> t_min);
 
     /**Perform a dns query
     *
     * @param name Hostname to resolve
     * @param ip   Buffer to store IP address
     * @return 0 true on success, false on failure
     */
     bool dns_lookup(const char *name, char *ip);
 
     /**
     * Open a socketed connection
     *
     * @param type the type of socket to open "UDP" or "TCP"
     * @param id id to give the new socket, valid 0-4
     * @param port port to open connection with
     * @param addr the IP address of the destination
     * @param port the port on the destination
     * @param local_port UDP socket's local port, zero means any
     * @param udp_mode UDP socket's mode, zero means can't change remote, 1 can change once, 2 can change multiple times
     * @return NSAPI_ERROR_OK in success, negative error code in failure
     */
     nsapi_error_t open_udp(int id, const char *addr, int port, int local_port = 0, int udp_mode = 0);
 
     /**
     * Open a socketed connection
     *
     * @param type the type of socket to open "UDP" or "TCP"
     * @param id id to give the new socket, valid 0-4
     * @param port port to open connection with
     * @param addr the IP address of the destination
     * @param port the port on the destination
     * @param tcp_keepalive TCP connection's keep alive time, zero means disabled
     * @return NSAPI_ERROR_OK in success, negative error code in failure
     */
     nsapi_error_t open_tcp(int id, const char *addr, int port, int keepalive = 0);
 
     /**
     * Sends data to an open socket
     *
     * @param id id of socket to send to
     * @param data data to be sent
     * @param amount amount of data to be sent - max 2048
     * @return number of bytes on success, negative error code in failure
     */
     nsapi_size_or_error_t send(int id, const void *data, uint32_t amount);
 
     /**
     * Receives datagram from an open UDP socket
     *
     * @param id id to receive from
     * @param data placeholder for returned information
     * @param amount number of bytes to be received
     * @return the number of bytes received
     */
     int32_t recv_udp(struct esp8266_socket *socket, void *data, uint32_t amount, mbed::chrono::milliseconds_u32 timeout = ESP8266_RECV_TIMEOUT);
 
     /**
     * Receives stream data from an open TCP socket
     *
     * @param id id to receive from
     * @param data placeholder for returned information
     * @param amount number of bytes to be received
     * @return the number of bytes received
     */
     int32_t recv_tcp(int id, void *data, uint32_t amount, mbed::chrono::milliseconds_u32 timeout = ESP8266_RECV_TIMEOUT);
 
     /**
     * Closes a socket
     *
     * @param id id of socket to close, valid only 0-4
     * @return true only if socket is closed successfully
     */
     bool close(int id);
 
     /**
     * Allows timeout to be changed between commands
     *
     * @param timeout_ms timeout of the connection
     */
     void set_timeout(mbed::chrono::milliseconds_u32 timeout = ESP8266_MISC_TIMEOUT);
 
     /**
     * Checks if data is available
     */
     bool readable();
 
     /**
     * Checks if data can be written
     */
     bool writeable();
 
     /**
     * Attach a function to call whenever sigio happens in the serial
     *
     * @param func A pointer to a void function, or 0 to set as none
     */
     void sigio(mbed::Callback<void()> func);
 
     /**
     * Attach a function to call whenever sigio happens in the serial
     *
     * @param obj pointer to the object to call the member function on
     * @param method pointer to the member function to call
     */
     template <typename T, typename M>
     void sigio(T *obj, M method)
     {
         sigio(mbed::Callback<void()>(obj, method));
     }
 
     /**
     * Attach a function to call whenever network state has changed.
     *
     * @param func A pointer to a void function, or 0 to set as none
     */
     void attach(mbed::Callback<void()> status_cb);
 
     /**
      * Configure SNTP (Simple Network Time Protocol)
      *
      * @param enable   true to enable SNTP or false to disable it
      * @param timezone timezone offset [-11,13] (0 by default)
      * @param server0  optional parameter indicating the first SNTP server ("cn.ntp.org.cn" by default)
      * @param server1  optional parameter indicating the second SNTP server ("ntp.sjtu.edu.cn" by default)
      * @param server2  optional parameter indicating the third SNTP server ("us.pool.ntp.org" by default)
      *
      * @retval true if successful, false otherwise
      */
     bool set_sntp_config(bool enable, int timezone = 0, const char *server0 = nullptr,
                          const char *server1 = nullptr, const char *server2 = nullptr);
 
     /**
      * Read out the configuration of SNTP (Simple Network Time Protocol)
      *
      * @param enable   true if SNTP is enabled
      * @param timezone timezone offset [-11,13]
      * @param server0  name of the first SNTP server
      * @param server1  name of the second SNTP server (optional, nullptr if not set)
      * @param server2  name of the third SNTP server (optional, nullptr if not set)
      *
      * @retval true if successful, false otherwise
      */
     bool get_sntp_config(bool *enable, int *timezone, char *server0,
                          char *server1, char *server2);
 
     /**
      * Read out SNTP time from ESP8266.
      *
      * @param t std::tm structure to be filled in
      * @retval true on success, false otherwise
      *
      * @note ESP8266 must be connected and needs a couple of seconds
      * before returning correct time. It may return 1 Jan 1970 if it is not ready.
      *
      * @note esp8266.sntp-enable must be set to true in mbed_app.json file.
      */
     bool get_sntp_time(std::tm *t);
 
     template <typename T, typename M>
     void attach(T *obj, M method)
     {
         attach(mbed::Callback<void()>(obj, method));
     }
 
     /**
      * Read default Wifi mode from flash
      *
      * return Station, SoftAP or SoftAP+Station - 0 on failure
      */
     int8_t default_wifi_mode();
 
     /**
      * Default Wifi mode written to flash only if changes
      */
     bool set_default_wifi_mode(const int8_t mode);
 
     /**
      * @param track_ap      if TRUE, sets the county code to be the same as the AP's that ESP is connected to,
      *                      if FALSE the code will not change
      * @param country_code  ISO 3166-1 Alpha-2 coded country code
      * @param channel_start the channel number to start at
      * @param channels      number of channels
      */
     bool set_country_code_policy(bool track_ap, const char *country_code, int channel_start, int channels);
 
     /** Get the connection status
      *
      *  @return         The connection status according to ConnectionStatusType
      */
     nsapi_connection_status_t connection_status() const;
 
     /**
      * Start board's and ESP8266's UART flow control
      *
      * @return true if started
      */
     bool start_uart_hw_flow_ctrl();
 
     /**
      * Stop board's and ESP8266's UART flow control
      *
      * @param board_only    true to apply to board only, false to apply both
      * @return true if started
      */
     bool stop_uart_hw_flow_ctrl(bool board_only = false);
 
     /*
      * From AT firmware v1.7.0.0 onwards enables TCP passive mode
      */
     bool cond_enable_tcp_passive_mode();
 
     /**
      * For executing OOB processing on background
      *
      * @param timeout AT parser receive timeout
      * @param if TRUE, process all OOBs instead of only one
      */
     void bg_process_oob(std::chrono::duration<uint32_t, std::milli> timeout, bool all);
 
     /**
      * Flush the serial port input buffers.
      *
      * If you do HW reset for ESP module, you should
      * flush the input buffers from existing responses
      * from the device.
      */
     void flush();
 
     static const int8_t WIFIMODE_STATION = 1;
     static const int8_t WIFIMODE_SOFTAP = 2;
     static const int8_t WIFIMODE_STATION_SOFTAP = 3;
     static const int8_t SOCKET_COUNT = 5;
 
     /**
      * Enables or disables uart input and deep sleep
      *
      * @param lock if TRUE, uart input is enabled and  deep sleep is locked
      * if FALSE, uart input is disabled and  deep sleep is unlocked
      */
     int uart_enable_input(bool lock);
 
 private:
     // FW version
     struct fw_sdk_version _sdk_v;
     struct fw_at_version _at_v;
 
     // FW version specific settings and functionalities
     bool _tcp_passive;
     int32_t _recv_tcp_passive(int id, void *data, uint32_t amount, std::chrono::duration<uint32_t, std::milli> timeout);
     mbed::Callback<void()> _callback;
 
     // UART settings
     mbed::BufferedSerial _serial;
     PinName _serial_rts;
     PinName _serial_cts;
     rtos::Mutex _smutex; // Protect serial port access
 
     // AT Command Parser
     mbed::ATCmdParser _parser;
 
     // Wifi scan result handling
     bool _recv_ap(nsapi_wifi_ap_t *ap);
 
     // Socket data buffer
     struct packet {
         struct packet *next;
         int id;
         char remote_ip[16];
         int remote_port;
         uint32_t len; // Remaining length
         uint32_t alloc_len; // Original length
         // data follows
     } *_packets, * *_packets_end;
     void _clear_socket_packets(int id);
     void _clear_socket_sending(int id);
     int _sock_active_id;
 
     // Memory statistics
     size_t _heap_usage; // (Socket data buffer usage)
 
     // OOB processing
     void _process_oob(std::chrono::duration<uint32_t, std::milli> timeout, bool all);
 
     // OOB message handlers
     void _oob_packet_hdlr();
     void _oob_connect_err();
     void _oob_conn_already();
     void _oob_err();
     void _oob_socket0_closed();
     void _oob_socket1_closed();
     void _oob_socket2_closed();
     void _oob_socket3_closed();
     void _oob_socket4_closed();
     void _oob_connection_status();
     void _oob_socket_close_err();
     void _oob_watchdog_reset();
     void _oob_busy();
     void _oob_tcp_data_hdlr();
     void _oob_ready();
     void _oob_scan_results();
     void _oob_send_ok_received();
     void _oob_send_fail_received();
 
     // OOB state variables
     int _connect_error;
     bool _disconnect;
     bool _fail;
     bool _sock_already;
     bool _closed;
     bool _error;
     bool _busy;
     bool _reset_done;
     int _sock_sending_id;
 
     // Modem's address info
     char _ip_buffer[16];
     char _gateway_buffer[16];
     char _netmask_buffer[16];
     char _mac_buffer[18];
 
     // Modem's socket info
     struct _sock_info {
         bool open;
         nsapi_protocol_t proto;
         char *tcp_data;
         int32_t tcp_data_avbl; // Data waiting on modem
         int32_t tcp_data_rcvd;
         bool send_fail;     // Received 'SEND FAIL'. Expect user will close the socket.
     };
     struct _sock_info _sock_i[SOCKET_COUNT];
 
     // Scan results
     struct _scan_results {
         WiFiAccessPoint *res;
         unsigned limit;
         unsigned cnt;
     };
     struct _scan_results _scan_r;
 
     // Connection state reporting
     nsapi_connection_status_t _conn_status;
     mbed::Callback<void()> _conn_stat_cb; // ESP8266Interface registered
 };
 #endif
 #endif
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