ESP8266 driver using the NodeMCU interface
Dependencies: BufferedSerial
Dependents: esp8266_nodeMCU1 esp8266_2_thingspeak1 Solarator_0-0-2 IoTBurglar_and_Fire_AlarmSystem ... more
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This is an alternative implementation of the ESP8266 driver that uses the NodeMCU firmware. The NodeMCU firmware provides a slightly larger feature set than the default firmware through a Lua interpreter.
Note
This library is currently in Alpha. It is not feature complete and has some bugs, proceed with caution. Fixes and patches are welcome!
Interface changes
- SSID and passphrase moved out of ESP8266Interface constructor and to ESP8266Interface::connect
- ESP8266Interface constructor provides optional timeout parameter to specify how long to wait for network operations
Note
NodeMCU defaults to a baud rate of 9600 instead of 115200 used by the default firmware.
Firmware
To install the NodeMCU firmware, follow the instructions on the Firmware Update wiki page using the nodemcu_integer_0.9.6-dev_20150406.bin binary at address 0x00000 instead of boot_v1.1.bin and user1.bin.
Since the NodeMCU firmware defaults to a baud rate of 9600, the Serial Passthrough program can be used to get direct access to the Lua interpreter running on the ESP8266.
Status
Working features:
- TCP Client
- UDP Client Transmit (Currently only UDP Server can recieve messages)
- Single Connection at a time
- Station Mode (Connects to AP)
- DNS Lookups
To be implemented:
- TCP Server
- UDP Server
- UDP Client recieve
- Multiple Connections tracked through Lua variables
- AP Mode (Act as access point)
- IPV6 support (Existing issue with NodeMCU)
ESP8266/ESP8266.h
- Committer:
- michaeljkoster
- Date:
- 2014-12-01
- Revision:
- 16:3f0efaa57a12
- Parent:
- 15:37a7a56a424f
- Child:
- 19:fb8d5bff2076
File content as of revision 16:3f0efaa57a12:
/* Copyright (C) 2012 mbed.org, MIT License * * Permission is hereby granted, free of charge, to any person obtaining a copy of this software * and associated documentation files (the "Software"), to deal in the Software without restriction, * including without limitation the rights to use, copy, modify, merge, publish, distribute, * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all copies or * substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * * @section DESCRIPTION * * ESP8266 serial wifi module * * Datasheet: * * http://www.electrodragon.com/w/Wi07c */ #ifndef ESP8266_H #define ESP8266_H #include "mbed.h" #include "CBuffer.h" #define DEFAULT_WAIT_RESP_TIMEOUT 500 /** * The ESP8266 class */ class ESP8266 { public: /** * Constructor * * @param tx mbed pin to use for tx line of Serial interface * @param rx mbed pin to use for rx line of Serial interface * @param reset reset pin of the wifi module () * @param ssid ssid of the network * @param phrase WEP, WPA or WPA2 key */ ESP8266( PinName tx, PinName rx, PinName reset, const char * ssid, const char * phrase ); /** * Connect the wifi module to the ssid contained in the constructor. * * @return true if connected, false otherwise */ bool join(); /** * Same as Join: connect to the ssid and get DHCP settings * @return true if successful */ bool connect(); /** * Check connection to the access point * @return true if successful */ bool is_connected(); /** * Disconnect the ESP8266 module from the access point * * @return true if successful */ bool disconnect(); /* * Start up a UDP Connection */ bool startUDP(char* ip, int port); /** * Close a connection * * @return true if successful */ bool close(); /** * Return the IP address * @return IP address as a string */ char* getIPAddress(); /** * Return the IP address from host name * @return IP address as a string */ bool gethostbyname(const char * host, char * ip); /** * Reset the wifi module */ void reset(); /** * Reboot the wifi module */ bool reboot(); /** * Check if characters are available * * @return number of available characters */ int readable(); /** * Check if characters are available * * @return number of available characters */ int writeable(); /** * Read a character * * @return the character read */ char getc(); /** * Write a character * * @param the character which will be written */ int putc(char c); /** * Flush the buffer */ void flush(); /** * Send a command to the wify module. Check if the module is in command mode. If not enter in command mode * * @param str string to be sent * @param ACK string which must be acknowledge by the wifi module. If ACK == NULL, no string has to be acknoledged. (default: "NO") * @param res this field will contain the response from the wifi module, result of a command sent. This field is available only if ACK = "NO" AND res != NULL (default: NULL) * * @return true if successful */ bool sendCommand(const char * cmd, const char * ack = NULL, char * res = NULL, int timeout = DEFAULT_WAIT_RESP_TIMEOUT); /** * Send a string to the wifi module by serial port. This function desactivates the user interrupt handler when a character is received to analyze the response from the wifi module. * Useful to send a command to the module and wait a response. * * * @param str string to be sent * @param len string length * @param ACK string which must be acknowledge by the wifi module. If ACK == NULL, no string has to be acknoledged. (default: "NO") * @param res this field will contain the response from the wifi module, result of a command sent. This field is available only if ACK = "NO" AND res != NULL (default: NULL) * * @return true if ACK has been found in the response from the wifi module. False otherwise or if there is no response in 5s. */ int send(const char * buf, int len); static ESP8266 * getInstance() { return inst; }; protected: Serial wifi; DigitalOut reset_pin; char phrase[30]; char ssid[30]; char ipString[20]; CircBuffer<char> buf_ESP8266; static ESP8266 * inst; void ATcommand(char* command); void attach_rx(bool null); void handler_rx(void); typedef struct STATE { bool associated; } State; State state; }; #endif