Socket interface for ESP8266. Implements the NetworkSocketAPI. Requires device to use the Espressif Firmware.

Dependencies:   ESP8266

Dependents:   ESP8266InterfaceTests HelloESP8266Interface

Fork of ESP8266Interface by NetworkSocketAPI

Note

This library assumes your ESP8266 is running the Espressif Firmware. For instructions on how to update your ESP8266 to use the correct firmware see the Firmware Update Wiki Page.

Currently the ESP8266Interface LIbrary has the following Abilities:

Working

  • TCP Client
  • UDP Client
  • Transparent mode (single connection of 1 type at a time)
  • Station Mode (connects to AP)

To be implimented

  • TCP Server
  • UDP Server
  • Multi Connection Mode (able to have up to 5 sockets at a time)
  • AP Mode (Make ESP Chip act like access point)
  • DNS Support (currently websites must be looked up by IP)
  • Error Recovery

Nice but not necessary

  • colorized text for ESP AT Commands in Command line (easier to differentiate from other text)

ESP8266Interface.cpp

Committer:
sarahmarshy
Date:
2015-08-27
Revision:
29:f2ae8f47729b
Parent:
28:6426873b21bd
Child:
30:c19f1e61063b

File content as of revision 29:f2ae8f47729b:

/* ESP8266Interface Example
 * 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.
 */

#include "ESP8266Interface.h"

ESP8266Interface::ESP8266Interface(PinName tx, PinName rx) : esp8266(tx, rx)
{
    uuidCounter = 0;
    std::fill_n(availableID, sizeof(availableID)/sizeof(int), -1);
}

int32_t ESP8266Interface::init(void)
{
    if (!esp8266.startup()) {
        return -1;
    }
    if (!esp8266.reset()) {
        return -1;
    }
    if (!esp8266.wifiMode(3)) {
        return -1;
    }
    if (!esp8266.multipleConnections(true)) {
        return -1;
    }
    return 0;
}

int32_t ESP8266Interface::init(const char *ip, const char *mask, const char *gateway)
{
    return -1;
}

int32_t ESP8266Interface::connect(uint32_t timeout_ms)
{
    return -1;
}

int32_t ESP8266Interface::connect(const char *ap, const char *pass_phrase, wifi_security_t security, uint32_t timeout_ms)
{
    esp8266.setTimeout(timeout_ms);
    if (!esp8266.dhcp(1, true)) {
        return -1;
    }
    if (!esp8266.connect(ap, pass_phrase)) {
        return -1;
    }
    return 0;
}

int32_t ESP8266Interface::disconnect(void)
{
    if (!esp8266.disconnect()) {
        return -1;
    }
    for(int i=0; i<numSockets; i++) {
        SocketInterface *socket = sockets[availableID[i]];
        deallocateSocket(socket);
    }
    return 0;
}

char *ESP8266Interface::getIPAddress(void)
{
    if(!esp8266.getIPAddress(ip)) {
        return NULL;
    }
    return ip;
}

char *ESP8266Interface::getGateway(void) const
{
    return 0;
}

char *ESP8266Interface::getNetworkMask(void) const
{
    return 0;
}

char *ESP8266Interface::getMACAddress(void) const
{
    return 0;
}

int32_t ESP8266Interface::isConnected(void)
{
    return (getIPAddress() == NULL) ? -1 : 0;
}

SocketInterface *ESP8266Interface::allocateSocket(socket_protocol_t socketProtocol)
{
    int id = -1;
    //Look through the array of available sockets for an unused ID
    for(int i=0; i<numSockets; i++) {
        if (availableID[i] == -1) {
            id = i;
            availableID[i] = uuidCounter;
            break;
        }
    }
    if (id == -1) {
        return NULL;//tried to allocate more than the maximum 5 sockets
    }
    ESP8266Socket *socket = new ESP8266Socket(uuidCounter++, esp8266, socketProtocol, (uint8_t)id);
    sockets[socket->getHandle()] = socket;
    return socket;
}

int ESP8266Interface::deallocateSocket(SocketInterface *socket)
{
    int id = (int)static_cast<ESP8266Socket*>(socket)->getID();
    availableID[id] = -1;

    std::map<uint32_t, SocketInterface*>::iterator it;

    // Check if socket is owned by WiFiRadioInterface
    it = sockets.find(socket->getHandle());

    if (it != sockets.end()) {
        // If so, erase it from the internal socket map and deallocate the socket
        sockets.erase(it);
        delete socket;
    } else {
        // Socket is not owned by WiFiRadioInterface, so return -1 error
        return -1;
    }
    return 0;
}
void ESP8266Interface::getHostByName(const char *name, char* hostIP)
{
    SocketInterface* sock = this->allocateSocket(SOCK_UDP);
    DnsQuery dns(sock, name, hostIP);
    this->deallocateSocket(sock);
}   

ESP8266Socket::ESP8266Socket(uint32_t handle, ESP8266 &driver, socket_protocol_t type, uint8_t id)
{
    _handle = handle;
    _driver = &driver;
    _type = type;
    _id = id;
}

const char *ESP8266Socket::getHostByName(const char *name) const
{
    return 0;
}

void ESP8266Socket::setAddress(const char* addr)
{
    _addr = addr;
}

void ESP8266Socket::setPort(uint16_t port)
{
    _port = port;
}

void ESP8266Socket::setAddressPort(const char* addr, uint16_t port)
{
    _addr = addr;
    _port = port;
}

const char *ESP8266Socket::getAddress(void) const
{
    return _addr;
}

uint16_t ESP8266Socket::getPort(void) const
{
    return _port;
}


int32_t ESP8266Socket::bind(uint16_t port) const
{
    return -1;
}

int32_t ESP8266Socket::listen(void) const
{
    return -1;
}

int32_t ESP8266Socket::accept() const
{
    return -1;
}

int32_t ESP8266Socket::open()
{

    string sock_type = (SOCK_UDP == _type) ? "UDP" : "TCP";
    if (!_driver->openSocket(sock_type, _id, _port, _addr)) {
        return -1;
    }
    return 0;

}

int32_t ESP8266Socket::send(const void *data, uint32_t amount, uint32_t timeout_ms)
{
    _driver->setTimeout((int)timeout_ms);
    if(!_driver->sendData(_id, data, amount)) {
        return -1;
    }
    return 0;
}

uint32_t ESP8266Socket::recv(void *data, uint32_t amount, uint32_t timeout_ms)
{
    _driver->setTimeout((int)timeout_ms);
    return _driver->recv(data, amount);
}

int32_t ESP8266Socket::close() const
{
    if (!_driver->close(_id)) {
        return -1;//closing socket not succesful
    }
    return 0;
}

uint32_t ESP8266Socket::getHandle()const
{
    return _handle;
}

uint8_t ESP8266Socket::getID()
{
    return _id;
}