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#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
#include <esp_system.h>
#include <esp_event.h>
#include <esp_log.h>
#include <esp_err.h>
#include <esp_wifi.h>
#include <nvs_flash.h>
#include "eos.h"
#include "net.h"
#include "wifi.h"
// XXX: WiFi fail due to no DHCP server
#define WIFI_MAX_SCAN_RECORDS 20
#define WIFI_MAX_CONNECT_ATTEMPTS 3
#define WIFI_STATE_STOPPED 0
#define WIFI_STATE_SCANNING 1
#define WIFI_STATE_CONNECTING 2
#define WIFI_STATE_CONNECTED 3
#define WIFI_STATE_DISCONNECTING 4
#define WIFI_STATE_DISCONNECTED 5
#define WIFI_ACTION_NONE 0
#define WIFI_ACTION_SCAN 1
#define WIFI_ACTION_CONNECT 2
#define WIFI_ACTION_DISCONNECT 3
static const char *TAG = "EOS WIFI";
static SemaphoreHandle_t mutex;
static wifi_config_t wifi_sta_config;
static wifi_scan_config_t wifi_scan_config;
static int wifi_connect_cnt = 0;
static uint8_t wifi_action;
static uint8_t wifi_state;
static wifi_ap_record_t scan_r[WIFI_MAX_SCAN_RECORDS];
static uint16_t scan_n;
static void wifi_event_handler(void *arg, esp_event_base_t event_base, int32_t event_id, void *event_data) {
esp_err_t ret = ESP_OK;
char _disconnect;
uint8_t _action, _state;
unsigned char *rbuf, *p;
int i, len;
ip_event_got_ip_t *got_ip;
if (event_base == WIFI_EVENT) {
switch(event_id) {
case WIFI_EVENT_SCAN_DONE:
scan_n = WIFI_MAX_SCAN_RECORDS;
memset(scan_r, 0, sizeof(scan_r));
esp_wifi_scan_get_ap_records(&scan_n, scan_r);
ESP_LOGI(TAG, "Scan done: %d", scan_n);
xSemaphoreTake(mutex, portMAX_DELAY);
_state = wifi_state;
if (wifi_state == WIFI_STATE_CONNECTED) wifi_action = WIFI_ACTION_NONE;
xSemaphoreGive(mutex);
if (_state != WIFI_STATE_CONNECTED) ret = esp_wifi_stop();
rbuf = eos_net_alloc();
rbuf[0] = EOS_WIFI_MTYPE_SCAN;
p = rbuf + 1;
for (i=0; i<scan_n; i++) {
len = strnlen((char *)scan_r[i].ssid, sizeof(scan_r[i].ssid));
if (len == sizeof(scan_r[i].ssid)) continue;
if (p - rbuf + len + 1 > EOS_NET_MTU) break;
strcpy((char *)p, (char *)scan_r[i].ssid);
p += len + 1;
}
eos_net_send(EOS_NET_MTYPE_WIFI, rbuf, p - rbuf);
break;
case WIFI_EVENT_STA_START:
xSemaphoreTake(mutex, portMAX_DELAY);
_action = wifi_action;
xSemaphoreGive(mutex);
switch (_action) {
case WIFI_ACTION_SCAN:
ret = esp_wifi_scan_start(&wifi_scan_config, 0);
break;
case WIFI_ACTION_CONNECT:
ret = esp_wifi_connect();
break;
default:
break;
}
break;
case WIFI_EVENT_STA_STOP:
xSemaphoreTake(mutex, portMAX_DELAY);
wifi_state = WIFI_STATE_STOPPED;
wifi_action = WIFI_ACTION_NONE;
xSemaphoreGive(mutex);
break;
case WIFI_EVENT_STA_CONNECTED:
xSemaphoreTake(mutex, portMAX_DELAY);
wifi_state = WIFI_STATE_CONNECTED;
wifi_action = WIFI_ACTION_NONE;
wifi_connect_cnt = WIFI_MAX_CONNECT_ATTEMPTS;
xSemaphoreGive(mutex);
break;
case WIFI_EVENT_STA_DISCONNECTED:
xSemaphoreTake(mutex, portMAX_DELAY);
if (wifi_connect_cnt) wifi_connect_cnt--;
_action = wifi_action;
_disconnect = (wifi_connect_cnt == 0);
if (_disconnect) wifi_state = WIFI_STATE_DISCONNECTED;
xSemaphoreGive(mutex);
if (_disconnect) {
rbuf = eos_net_alloc();
rbuf[0] = EOS_WIFI_MTYPE_DISCONNECT;
eos_net_send(EOS_NET_MTYPE_WIFI, rbuf, 1);
if (!_action) ret = esp_wifi_stop();
} else {
ret = esp_wifi_connect();
}
break;
default: // Ignore the other event types
break;
}
} else if (event_base == IP_EVENT) {
switch(event_id) {
case IP_EVENT_STA_GOT_IP:
got_ip = (ip_event_got_ip_t *)event_data;
ESP_LOGI(TAG, "IP address: " IPSTR, IP2STR(&got_ip->ip_info.ip));
rbuf = eos_net_alloc();
rbuf[0] = EOS_WIFI_MTYPE_CONNECT;
rbuf[1] = EOS_OK;
eos_net_send(EOS_NET_MTYPE_WIFI, rbuf, 2);
/* ip_changed is set even at normal connect!
if (got_ip->ip_changed) {
ESP_LOGI(TAG, "IP changed");
// send wifi reconnect
} else {
rbuf = eos_net_alloc();
rbuf[0] = EOS_WIFI_MTYPE_CONNECT;
rbuf[1] = EOS_OK;
eos_net_send(EOS_NET_MTYPE_WIFI, rbuf, 2);
}
*/
break;
default: // Ignore the other event types
break;
}
}
if (ret != ESP_OK) ESP_LOGE(TAG, "EVT HANDLER ERR:%d EVT:%d", ret, event_id);
}
static void wifi_handler(unsigned char _mtype, unsigned char *buffer, uint16_t buf_len) {
uint8_t mtype;
int rv;
char *ssid, *pass, *_buf;
uint16_t _buf_len;
if (buf_len < 1) return;
rv = EOS_OK;
mtype = buffer[0];
buffer++;
buf_len--;
switch (mtype) {
case EOS_WIFI_MTYPE_SCAN:
rv = eos_wifi_scan();
break;
case EOS_WIFI_MTYPE_AUTH:
_buf = (char *)buffer;
_buf_len = 0;
ssid = _buf;
_buf_len = strnlen(_buf, buf_len);
if (_buf_len == buf_len) break;
_buf += _buf_len + 1;
buf_len -= _buf_len + 1;
pass = _buf;
_buf_len = strnlen(_buf, buf_len);
if (_buf_len == buf_len) break;
_buf += _buf_len + 1;
buf_len -= _buf_len + 1;
rv = eos_wifi_auth(ssid, pass);
break;
case EOS_WIFI_MTYPE_CONNECT:
rv = eos_wifi_connect();
break;
case EOS_WIFI_MTYPE_DISCONNECT:
rv = eos_wifi_disconnect();
break;
}
if (rv) ESP_LOGE(TAG, "MSG HANDLER ERR:%d MSG:%d", rv, mtype);
}
void eos_wifi_init(void) {
esp_err_t ret;
wifi_init_config_t wifi_config = WIFI_INIT_CONFIG_DEFAULT();
memset(&wifi_sta_config, 0, sizeof(wifi_sta_config));
esp_netif_create_default_wifi_sta();
ret = esp_wifi_init(&wifi_config);
assert(ret == ESP_OK);
ret = esp_event_handler_instance_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &wifi_event_handler, NULL, NULL);
assert(ret == ESP_OK);
ret = esp_event_handler_instance_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &wifi_event_handler, NULL, NULL);
assert(ret == ESP_OK);
ret = esp_wifi_set_storage(WIFI_STORAGE_RAM);
assert(ret == ESP_OK);
ret = esp_wifi_set_mode(WIFI_MODE_STA);
assert(ret == ESP_OK);
ret = esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_sta_config);
assert(ret == ESP_OK);
ret = esp_wifi_stop();
assert(ret == ESP_OK);
mutex = xSemaphoreCreateBinary();
xSemaphoreGive(mutex);
eos_net_set_handler(EOS_NET_MTYPE_WIFI, wifi_handler);
ESP_LOGI(TAG, "INIT");
}
int eos_wifi_scan(void) {
int rv = EOS_OK;
esp_err_t ret = ESP_OK;
uint8_t _wifi_state = 0;
xSemaphoreTake(mutex, portMAX_DELAY);
if (!wifi_action) {
_wifi_state = wifi_state;
wifi_action = WIFI_ACTION_SCAN;
if (wifi_state == WIFI_STATE_STOPPED) wifi_state = WIFI_STATE_SCANNING;
memset(&wifi_scan_config, 0, sizeof(wifi_scan_config));
} else {
rv = EOS_ERR_BUSY;
}
xSemaphoreGive(mutex);
if (rv) return rv;
if (_wifi_state == WIFI_STATE_STOPPED) {
ret = esp_wifi_start();
} else {
ret = esp_wifi_scan_start(&wifi_scan_config, 0);
}
if (ret != ESP_OK) rv = EOS_ERR;
return rv;
}
int eos_wifi_auth(char *ssid, char *pass) {
int rv = EOS_OK;
xSemaphoreTake(mutex, portMAX_DELAY);
if (!wifi_action) {
if (ssid) strncpy((char *)wifi_sta_config.sta.ssid, ssid, sizeof(wifi_sta_config.sta.ssid) - 1);
if (pass) strncpy((char *)wifi_sta_config.sta.password, pass, sizeof(wifi_sta_config.sta.password) - 1);
} else {
rv = EOS_ERR_BUSY;
}
xSemaphoreGive(mutex);
return rv;
}
int eos_wifi_connect(void) {
int rv = EOS_OK;
esp_err_t ret = ESP_OK;
uint8_t _wifi_state = 0;
xSemaphoreTake(mutex, portMAX_DELAY);
if (!wifi_action) {
_wifi_state = wifi_state;
wifi_action = WIFI_ACTION_CONNECT;
wifi_state = WIFI_STATE_CONNECTING;
wifi_connect_cnt = WIFI_MAX_CONNECT_ATTEMPTS;
} else {
rv = EOS_ERR_BUSY;
}
xSemaphoreGive(mutex);
if (rv) return rv;
esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_sta_config);
if (_wifi_state == WIFI_STATE_STOPPED) {
ret = esp_wifi_start();
} else {
ret = esp_wifi_connect();
}
if (ret != ESP_OK) rv = EOS_ERR;
return rv;
}
int eos_wifi_disconnect(void) {
int rv = EOS_OK;
esp_err_t ret = ESP_OK;
xSemaphoreTake(mutex, portMAX_DELAY);
if (!wifi_action) {
wifi_action = WIFI_ACTION_DISCONNECT;
wifi_state = WIFI_STATE_DISCONNECTING;
wifi_connect_cnt = 0;
memset(wifi_sta_config.sta.ssid, 0, sizeof(wifi_sta_config.sta.ssid));
memset(wifi_sta_config.sta.password, 0, sizeof(wifi_sta_config.sta.password));
} else {
rv = EOS_ERR_BUSY;
}
xSemaphoreGive(mutex);
if (rv) return rv;
ret = esp_wifi_stop();
if (ret != ESP_OK) rv = EOS_ERR;
return rv;
}
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