Connecting an ESP8266 to an Access Point

Part 2 - Connecting an ESP8266 to an Access Point

The ESP8266 has built in WIFI. Next we will connect to an access point, get the MAC address and IP configuration.

Get MAC address

The command to get the MAC

bool wifi_get_macaddr(uint8 if_index , uint8 *macaddr) 

For station Mode, set if_index to 0x00, for the mac address of the soft access point set if_index to 0x01. 

Get Connection Status

uint8 wifi_station_get_connect_status(void)

The return value 

    STATION_IDLE = 0
    STATION_CONNECTING = 1
    STATION_WRONG_PASSWORD = 2
    STATION_NO_AP_FOUND = 3 
    STATION_CONNECT_FAIL = 4
    STATION_GOT_IP = 5

Get IP Configuration

bool wifi_get_ip_info(uint8 if_index, struct ip_info *info)

For station Mode, set if_index to 0x00, for the mac address of the soft access point set if_index to 0x01.

struct ip_info 
{
    struct ip_addr ip;
    struct ip_addr netmask;
    struct ip_addr gw;
}

struct ip_addr 
{
    uint32 addr;

}

Set WIFI Mode

bool wifi_set_opmode (uint8 opmode)

Set opmode to control to mode 

    0x01 STATION_MODE

    0x02 SOFTAP_MODE

    0x03 STATIONAP_MODE.

Full Code

#include "ets_sys.h"
#include "osapi.h"
#include "gpio.h"
#include "os_type.h"
#include "user_config.h"
#include "user_interface.h"

#define user_procTaskPrio        0
#define user_procTaskQueueLen    1
os_event_t    user_procTaskQueue[user_procTaskQueueLen];
static void loop(os_event_t *events);

// Print Ip Address
void print_ip(char *desc, uint32 addr)
{
    os_printf("%s", desc);
    if(addr>0)
    {
    os_printf("%d.%d.%d.%d", IP2STR(&addr));
    }
    else
      os_printf("Not set");
    os_printf("\n\r");
}

void show_connection()
{
    os_printf("\n\rCurrent Details\n\r");

    // Show MAC
    char mac_address[32];
    wifi_get_macaddr(0, &mac_address[0]);
    os_printf("MAC Address %02x-%02x-%02x-%02x-%02x-%02x\n\r", 
        (unsigned)mac_address[0], (unsigned)mac_address[1],
        (unsigned)mac_address[2], (unsigned)mac_address[3],    
        (unsigned)mac_address[4], (unsigned)mac_address[5]);

    // Get Status
    os_printf("Connect status - %d\n\r", 
        wifi_station_get_connect_status());

    // Get Config
    struct station_config current_config;
    wifi_station_get_config(&current_config);
    os_printf("Curent Config (Station - %s, Paswword - %s)\n\r", 
        current_config.ssid, current_config.password);

    // Get IP Info
    struct ip_info ipinfo;
    ipinfo.ip.addr=0;
    ipinfo.netmask.addr=255;
    ipinfo.gw.addr=0;
    wifi_get_ip_info(0, &ipinfo);

    print_ip("IP Address: ", ipinfo.ip.addr);
    print_ip("Netmask   : ", ipinfo.netmask.addr);
    print_ip("Gateway   : ", ipinfo.gw.addr);
}

//Main code function

static void ICACHE_FLASH_ATTR

loop(os_event_t *events)

{

    show_connection();

    os_delay_us(300000);

    system_os_post(user_procTaskPrio, 0, 0 );

}

//Init function

void ICACHE_FLASH_ATTR

user_init()

{

    char ssid[32] = "my_accesspoint";

    char password[64] = "my_password";

    struct station_config stationConf;

    //Set station mode

    wifi_set_opmode( 0x1 );

    //Set ap settings

    os_memcpy(&stationConf.ssid, ssid, 32);

    os_memcpy(&stationConf.password, password, 64);

    wifi_station_set_config(&stationConf);

    uart_div_modify(0,UART_CLK_FREQ / 115200);

    //Start os task

    system_os_task(loop, user_procTaskPrio,user_procTaskQueue, 

        user_procTaskQueueLen);

    system_os_post(user_procTaskPrio, 0, 0 );

}