File content as of revision 0:c265e9b31b1d:

#include "mbed.h"
 
Serial pc(USBTX, USBRX);
Serial esp(p28, p27); // tx, rx
DigitalOut reset(p26);
Timer t;
 
int  counter,ended,timeout;
char buffer[1024];
char str[255];
 
char ssid[32] = "accesspoint";     // enter WiFi router ssid inside the quotes
char pwd [32] = "password"; // enter WiFi router password inside the quotes
 
void SendCMD(),getreply(),ESPconfig(),ESPsetbaudrate();
 
 
int main()
{
    reset=0; //hardware reset for 8266
    pc.baud(9600);  // set what you want here depending on your terminal program speed
    pc.printf("\f\n\r-------------ESP8266 Hardware Reset-------------\n\r");
    wait(0.5);
    reset=1;
    timeout=2;
    getreply();
 
    esp.baud(115200);   // change this to the new ESP8266 baudrate if it is changed at any time.
 
    //ESPsetbaudrate();   //******************  include this routine to set a different ESP8266 baudrate  ******************
 
    ESPconfig();        //******************  include Config to set the ESP8266 configuration  ***********************
 
 
 
    // continuosly get AP list and IP
    while(1) {
        pc.printf("\n---------- Listing Acces Points ----------\r\n");
        strcpy(str, "AT+CWLAP\r\n");
        SendCMD();
        timeout=15;
        getreply();
        pc.printf(buffer);
        wait(2);
        pc.printf("\n---------- Get IP and MAC ----------\r\n");
        strcpy(str, "AT+CIFSR\r\n");
        SendCMD();
        timeout=10;
        getreply();
        pc.printf(buffer);
        wait(2);
    }
 
}
 
// Sets new ESP8266 baurate, change the esp.baud(xxxxx) to match your new setting once this has been executed
void ESPsetbaudrate()
{
    strcpy(str, "AT+CIOBAUD=115200\r\n");   // change the numeric value to the required baudrate
    SendCMD();
}
 
//  +++++++++++++++++++++++++++++++++ This is for ESP8266 config only, run this once to set up the ESP8266 +++++++++++++++
void ESPconfig()
{
    wait(5);
    strcpy(str,"AT\r\n");
    SendCMD();
    wait(1);
    strcpy(str,"AT\r\n");
    SendCMD();
    wait(1);
    strcpy(str,"AT\r\n");
    SendCMD();
    timeout=1;
    getreply();
    wait(1);
    pc.printf("\f---------- Starting ESP Config ----------\r\n\n");
 
    pc.printf("---------- Reset & get Firmware ----------\r\n");
    strcpy(str,"AT+RST\r\n");
    SendCMD();
    timeout=5;
    getreply();
    pc.printf(buffer);
 
    wait(2);
 
    pc.printf("\n---------- Get Version ----------\r\n");
    strcpy(str,"AT+GMR\r\n");
    SendCMD();
    timeout=4;
    getreply();
    pc.printf(buffer);
 
    wait(3);
 
    // set CWMODE to 1=Station,2=AP,3=BOTH, default mode 1 (Station)
    pc.printf("\n---------- Setting Mode ----------\r\n");
    strcpy(str, "AT+CWMODE=1\r\n");
    SendCMD();
    timeout=4;
    getreply();
    pc.printf(buffer);
 
    wait(2);
 
    // set CIPMUX to 0=Single,1=Multi
    pc.printf("\n---------- Setting Connection Mode ----------\r\n");
    strcpy(str, "AT+CIPMUX=1\r\n");
    SendCMD();
    timeout=4;
    getreply();
    pc.printf(buffer);
 
    wait(2);
 
    pc.printf("\n---------- Listing Access Points ----------\r\n");
    strcpy(str, "AT+CWLAP\r\n");
    SendCMD();
    timeout=15;
    getreply();
    pc.printf(buffer);
 
    wait(2);
 
    pc.printf("\n---------- Connecting to AP ----------\r\n");
    pc.printf("ssid = %s   pwd = %s\r\n",ssid,pwd);
    strcpy(str, "AT+CWJAP=\"");
    strcat(str, ssid);
    strcat(str, "\",\"");
    strcat(str, pwd);
    strcat(str, "\"\r\n");
    SendCMD();
    timeout=10;
    getreply();
    pc.printf(buffer);
 
    wait(5);
 
    pc.printf("\n---------- Get IP's ----------\r\n");
    strcpy(str, "AT+CIFSR\r\n");
    SendCMD();
    timeout=3;
    getreply();
    pc.printf(buffer);
 
    wait(1);
 
    pc.printf("\n---------- Get Connection Status ----------\r\n");
    strcpy(str, "AT+CIPSTATUS\r\n");
    SendCMD();
    timeout=5;
    getreply();
    pc.printf(buffer);
 
    pc.printf("\n\n\n  If you get a valid (non zero) IP, ESP8266 has been set up.\r\n");
    pc.printf("  Run this if you want to reconfig the ESP8266 at any time.\r\n");
    pc.printf("  It saves the SSID and password settings internally\r\n");
    wait(10);
}
 
void SendCMD()
{
    esp.printf("%s", str);
}
 
void getreply()
{
    memset(buffer, '\0', sizeof(buffer));
    t.start();
    ended=0;
    counter=0;
    while(!ended) {
        if(esp.readable()) {
            buffer[counter] = esp.getc();
            counter++;
        }
        if(t.read() > timeout) {
            ended = 1;
            t.stop();
            t.reset();
        }
    }
}