Antonio Quevedo / ESP8266

Library for using the Wifi module ESP8266, first version with basic commands, soon new commands will be added

Dependents:   PIR_Sensor_wifi myESP8266forLOstFound Motin_Activated_Temperature_Humidity_BluetoothHC-06_ESP8266_IOT 1Project3_Robot1_Final ... more

Library updated in Dec 28, 2014. Now the ESP baudrate is passed as a parameter in the constructor. Also, some new functions were added. Here is an example code:

ESP8266 example code

#include "mbed.h"
#include <string>
#include "ESP8266.h"

// Objects
Serial pc(USBTX, USBRX);
ESP8266 esp(PTE0, PTE1, 115200);

// Global variables
char snd[255], rcv[1000]; // Strings for sending and receiving commands / data / replies

int main() {
    pc.baud(115200);
    pc.printf("START\r\n");
    wait(3);
    
    pc.printf("Reset ESP\r\n");
    esp.Reset();
    esp.RcvReply(rcv, 400);
    pc.printf("%s", rcv);
    wait(2);
    pc.printf("Sending AT\r\n");
    strcpy(snd, "AT");
    esp.SendCMD(snd);
    esp.RcvReply(rcv, 400);
    pc.printf("%s", rcv);
    wait(2);
    pc.printf("Set mode to AP\r\n");
    esp.SetMode(1);
    esp.RcvReply(rcv, 1000);
    pc.printf("%s", rcv);
    
    pc.printf("Receiving Wifi List\r\n");
    esp.GetList(rcv);
    pc.printf("%s", rcv);
    
    pc.printf("Connecting to AP\r\n");
    esp.Join("MyAP", "MyPasswd"); // Replace MyAP and MyPasswd with your SSID and password
    esp.RcvReply(rcv, 1000);
    pc.printf("%s", rcv);
    wait(8);
    pc.printf("Getting IP\r\n");
    esp.GetIP(rcv);
    pc.printf("%s", rcv);
    pc.printf("Setting multiple connections\r\n");
    esp.SetMultiple();
    esp.RcvReply(rcv, 1000);
    pc.printf("%s", rcv);
    pc.printf("Getting Connection Status\r\n");
    esp.GetConnStatus(rcv);
    pc.printf("%s", rcv);
    pc.printf("Start server mode on port 80\r\n");
    esp.StartServerMode(80);
    esp.RcvReply(rcv, 1000);
    pc.printf("%s", rcv);
    wait(4);
    pc.printf("Close server mode\r\n");
    esp.CloseServerMode();
    esp.RcvReply(rcv, 1000);
    pc.printf("THE END");
    while(1);
}

Diff: ESP8266.cpp

Revision:
2:77388e8f0697
Parent:
1:399414d48048
--- a/ESP8266.cpp	Wed Dec 17 13:54:34 2014 +0000
+++ b/ESP8266.cpp	Sun Dec 28 21:58:49 2014 +0000
@@ -1,8 +1,8 @@
 #include "ESP8266.h"
 
 // Constructor
-ESP8266::ESP8266(PinName tx, PinName rx) : comm(tx, rx) {
-    comm.baud(115200);
+ESP8266::ESP8266(PinName tx, PinName rx, int br) : comm(tx, rx) {
+    comm.baud(br);
 }
 
 // Destructor
@@ -25,6 +25,29 @@
     s[k + 1] = 0;
 }
 
+// Converts integer number to null-terminated string
+void ESP8266::itoa(int n, char * s) {
+    char k = 0;
+    char r[11];
+    
+    if(n == 0) {
+        s[0] = '0';
+        s[1] = 0;
+    } else {
+        while(n != 0) {
+            r[k]= (n % 10) + '0';
+            n = n / 10;
+            k++;
+        }
+        while(k > 0) {
+            s[n] = r[k - 1] + '0';
+            n++;
+            k--;
+        }
+        s[n] = 0;
+    }
+}
+
 // Sends command to ESP8266. Receives the command string
 void ESP8266::SendCMD(char * s) {
     AddEOL(s);
@@ -117,4 +140,29 @@
     char rs[15];
     strcpy(rs, "AT+CIPMUX=1");
     SendCMD(rs);
+}
+
+// Gets connection status. Parameter: string to contain status
+void ESP8266::GetConnStatus(char * st) {
+    char cmd[15];
+    strcpy(cmd, "AT+CIPSTATUS");
+    SendCMD(cmd);
+    RcvReply(st, 2000);
+}
+
+// Starts server mode. Parameter: port to be used
+void ESP8266::StartServerMode(int port) {
+    char rs[25];
+    char t[4];
+    strcpy(rs, "AT+CIPSERVER=1,");
+    itoa(port, t);
+    strcat(rs, t);
+    SendCMD(rs);
+}
+
+// Close server mode.
+void ESP8266::CloseServerMode(void) {
+    char rs[20];
+    strcpy(rs, "AT+CIPSERVER=0");
+    SendCMD(rs);
 }
\ No newline at end of file