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ESP8266Interface.cpp
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301 lines (240 loc) · 7.27 KB
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/* 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.
*/
#include <string.h>
#include "ESP8266Interface.h"
#include "mbed_debug.h"
// Various timeouts for different ESP8266 operations
#define ESP8266_CONNECT_TIMEOUT 15000
#define ESP8266_SEND_TIMEOUT 500
#define ESP8266_RECV_TIMEOUT 0
#define ESP8266_MISC_TIMEOUT 500
// Firmware version
#define ESP8266_VERSION 2
// ESP8266Interface implementation
ESP8266Interface::ESP8266Interface(PinName tx, PinName rx, bool debug)
: _esp(tx, rx, debug)
{
memset(_ids, 0, sizeof(_ids));
memset(_cbs, 0, sizeof(_cbs));
_esp.attach(this, &ESP8266Interface::event);
}
int ESP8266Interface::connect(const char *ssid, const char *pass, nsapi_security_t security,
uint8_t channel)
{
if (channel != 0) {
return NSAPI_ERROR_UNSUPPORTED;
}
set_credentials(ssid, pass, security);
return connect();
}
int ESP8266Interface::connect()
{
_esp.setTimeout(ESP8266_CONNECT_TIMEOUT);
if (!_esp.reset()) {
return NSAPI_ERROR_DEVICE_ERROR;
}
_esp.setTimeout(ESP8266_MISC_TIMEOUT);
if (_esp.get_firmware_version() != ESP8266_VERSION) {
debug("ESP8266: ERROR: Firmware incompatible with this driver.\
\r\nUpdate to v%d - https://developer.mbed.org/teams/ESP8266/wiki/Firmware-Update\r\n",ESP8266_VERSION);
return NSAPI_ERROR_DEVICE_ERROR;
}
_esp.setTimeout(ESP8266_CONNECT_TIMEOUT);
if (!_esp.startup(3)) {
return NSAPI_ERROR_DEVICE_ERROR;
}
if (!_esp.dhcp(true, 1)) {
return NSAPI_ERROR_DHCP_FAILURE;
}
if (!_esp.connect(ap_ssid, ap_pass)) {
return NSAPI_ERROR_NO_CONNECTION;
}
if (!_esp.getIPAddress()) {
return NSAPI_ERROR_DHCP_FAILURE;
}
return NSAPI_ERROR_OK;
}
int ESP8266Interface::set_credentials(const char *ssid, const char *pass, nsapi_security_t security)
{
memset(ap_ssid, 0, sizeof(ap_ssid));
strncpy(ap_ssid, ssid, sizeof(ap_ssid));
memset(ap_pass, 0, sizeof(ap_pass));
strncpy(ap_pass, pass, sizeof(ap_pass));
ap_sec = security;
return 0;
}
int ESP8266Interface::set_channel(uint8_t channel)
{
return NSAPI_ERROR_UNSUPPORTED;
}
int ESP8266Interface::disconnect()
{
_esp.setTimeout(ESP8266_MISC_TIMEOUT);
if (!_esp.disconnect()) {
return NSAPI_ERROR_DEVICE_ERROR;
}
return NSAPI_ERROR_OK;
}
const char *ESP8266Interface::get_ip_address()
{
return _esp.getIPAddress();
}
const char *ESP8266Interface::get_mac_address()
{
return _esp.getMACAddress();
}
const char *ESP8266Interface::get_gateway()
{
return _esp.getGateway();
}
const char *ESP8266Interface::get_netmask()
{
return _esp.getNetmask();
}
int8_t ESP8266Interface::get_rssi()
{
return _esp.getRSSI();
}
int ESP8266Interface::scan(WiFiAccessPoint *res, unsigned count)
{
return _esp.scan(res, count);
}
struct esp8266_socket {
int id;
nsapi_protocol_t proto;
bool connected;
SocketAddress addr;
};
int ESP8266Interface::socket_open(void **handle, nsapi_protocol_t proto)
{
// Look for an unused socket
int id = -1;
for (int i = 0; i < ESP8266_SOCKET_COUNT; i++) {
if (!_ids[i]) {
id = i;
_ids[i] = true;
break;
}
}
if (id == -1) {
return NSAPI_ERROR_NO_SOCKET;
}
struct esp8266_socket *socket = new struct esp8266_socket;
if (!socket) {
return NSAPI_ERROR_NO_SOCKET;
}
socket->id = id;
socket->proto = proto;
socket->connected = false;
*handle = socket;
return 0;
}
int ESP8266Interface::socket_close(void *handle)
{
struct esp8266_socket *socket = (struct esp8266_socket *)handle;
int err = 0;
_esp.setTimeout(ESP8266_MISC_TIMEOUT);
if (socket->connected && !_esp.close(socket->id)) {
err = NSAPI_ERROR_DEVICE_ERROR;
}
socket->connected = false;
_ids[socket->id] = false;
delete socket;
return err;
}
int ESP8266Interface::socket_bind(void *handle, const SocketAddress &address)
{
return NSAPI_ERROR_UNSUPPORTED;
}
int ESP8266Interface::socket_listen(void *handle, int backlog)
{
return NSAPI_ERROR_UNSUPPORTED;
}
int ESP8266Interface::socket_connect(void *handle, const SocketAddress &addr)
{
struct esp8266_socket *socket = (struct esp8266_socket *)handle;
_esp.setTimeout(ESP8266_MISC_TIMEOUT);
const char *proto = (socket->proto == NSAPI_UDP) ? "UDP" : "TCP";
if (!_esp.open(proto, socket->id, addr.get_ip_address(), addr.get_port())) {
return NSAPI_ERROR_DEVICE_ERROR;
}
socket->connected = true;
return 0;
}
int ESP8266Interface::socket_accept(void *server, void **socket, SocketAddress *addr)
{
return NSAPI_ERROR_UNSUPPORTED;
}
int ESP8266Interface::socket_send(void *handle, const void *data, unsigned size)
{
struct esp8266_socket *socket = (struct esp8266_socket *)handle;
_esp.setTimeout(ESP8266_SEND_TIMEOUT);
if (!_esp.send(socket->id, data, size)) {
return NSAPI_ERROR_DEVICE_ERROR;
}
return size;
}
int ESP8266Interface::socket_recv(void *handle, void *data, unsigned size)
{
struct esp8266_socket *socket = (struct esp8266_socket *)handle;
_esp.setTimeout(ESP8266_RECV_TIMEOUT);
int32_t recv = _esp.recv(socket->id, data, size);
if (recv < 0) {
return NSAPI_ERROR_WOULD_BLOCK;
}
return recv;
}
int ESP8266Interface::socket_sendto(void *handle, const SocketAddress &addr, const void *data, unsigned size)
{
struct esp8266_socket *socket = (struct esp8266_socket *)handle;
if (socket->connected && socket->addr != addr) {
_esp.setTimeout(ESP8266_MISC_TIMEOUT);
if (!_esp.close(socket->id)) {
return NSAPI_ERROR_DEVICE_ERROR;
}
socket->connected = false;
}
if (!socket->connected) {
int err = socket_connect(socket, addr);
if (err < 0) {
return err;
}
socket->addr = addr;
}
return socket_send(socket, data, size);
}
int ESP8266Interface::socket_recvfrom(void *handle, SocketAddress *addr, void *data, unsigned size)
{
struct esp8266_socket *socket = (struct esp8266_socket *)handle;
int ret = socket_recv(socket, data, size);
if (ret >= 0 && addr) {
*addr = socket->addr;
}
return ret;
}
void ESP8266Interface::socket_attach(void *handle, void (*callback)(void *), void *data)
{
struct esp8266_socket *socket = (struct esp8266_socket *)handle;
_cbs[socket->id].callback = callback;
_cbs[socket->id].data = data;
}
void ESP8266Interface::event() {
for (int i = 0; i < ESP8266_SOCKET_COUNT; i++) {
if (_cbs[i].callback) {
_cbs[i].callback(_cbs[i].data);
}
}
}