main.cpp

00001 #include "mbed.h"
00002 #include "ESP8266.h"
00003  
00004 Serial pc(USBTX,USBRX);
00005  
00006 //POT sensor 
00007 AnalogIn pot(PTB1); 
00008  
00009 //wifi UART port and baud rate
00010 ESP8266 wifi(PTE0, PTE1, 115200); 
00011  
00012 //buffers for wifi library
00013 char snd[255],resp[1000];
00014 char http_cmd[300], comm[300];
00015  
00016 int timeout = 8000; //timeout for wifi commands
00017  
00018 //SSID and password for connection
00019 #define SSID "me" //"AmeyaHotspot"//"IoTServer" //"AmeyaHotspot" //"Xperia S_f19d" 
00020 #define PASS "123123123"  //"12345678" //"iotserver"  //"12345678" //"profpappu" 
00021  
00022 //Remote IP
00023 #define IP "184.106.153.149"
00024 //#define IP "https://api.thingspeak.com"
00025 //#define IP "192.168.0.25"
00026 //waterlevelue global variable
00027 float waterlevel = 0; 
00028  
00029 //Public and private keys for phant
00030 char* Update_Key1 = "KW85FFJJPQ5CW3KE";
00031 char* Update_Key2 = "6A0KQQKFBPJKLAFT";
00032 
00033 //char* Private_Key = "GPoWnRM60yidrB0e1pXD";
00034  
00035 //Wifi init function
00036 void wifi_initialize(void){
00037     
00038     pc.printf("******** Resetting wifi module ********\r\n");
00039     wifi.Reset();
00040     
00041     //wait for 5 seconds for response, else display no response receiveed
00042     if (wifi.RcvReply(resp, 5000))    
00043         pc.printf("%s",resp);    
00044     else
00045         pc.printf("No response");
00046     
00047     pc.printf("******** Setting Station mode of wifi with AP ********\r\n");
00048     wifi.SetMode(1);    // set transparent  mode
00049     if (wifi.RcvReply(resp, timeout))    //receive a response from ESP
00050         pc.printf("%s",resp);    //Print the response onscreen
00051     else
00052         pc.printf("No response while setting mode. \r\n");
00053     
00054     pc.printf("******** Joining network with SSID and PASS ********\r\n");
00055     wifi.Join(SSID, PASS);     
00056     if (wifi.RcvReply(resp, timeout))    
00057         pc.printf("%s",resp);   
00058     else
00059         pc.printf("No response while connecting to network \r\n");
00060         
00061     pc.printf("******** Getting IP and MAC of module ********\r\n");
00062     wifi.GetIP(resp);     
00063     if (wifi.RcvReply(resp, timeout))    
00064         pc.printf("%s",resp);    
00065     else
00066         pc.printf("No response while getting IP \r\n");
00067     
00068     pc.printf("******** Setting WIFI UART passthrough ********\r\n");
00069     wifi.setTransparent();          
00070     if (wifi.RcvReply(resp, timeout))    
00071         pc.printf("%s",resp);    
00072     else
00073         pc.printf("No response while setting wifi passthrough. \r\n");
00074     wait(1);    
00075     
00076     pc.printf("******** Setting single connection mode ********\r\n");
00077     wifi.SetSingle();             
00078     wifi.RcvReply(resp, timeout);
00079     if (wifi.RcvReply(resp, timeout))    
00080         pc.printf("%s",resp);    
00081     else
00082         pc.printf("No response while setting single connection \r\n");
00083     wait(1);
00084 }
00085  
00086 void wifi_send(void){
00087     
00088     pc.printf("******** Starting TCP connection on IP and port ********\r\n");
00089     wifi.startTCPConn(IP,80);    //cipstart
00090     wifi.RcvReply(resp, timeout);
00091     if (wifi.RcvReply(resp, timeout))    
00092         pc.printf("%s",resp);    
00093     else
00094         pc.printf("No response while starting TCP connection \r\n");
00095     wait(1);
00096     
00097     //create link 
00098     if(waterlevel>127)
00099           sprintf(http_cmd,"/update?api_key=%s&field1=%f",Update_Key1,waterlevel); 
00100     else
00101           sprintf(http_cmd,"/update?api_key=%s&field1=%f",Update_Key2,waterlevel); 
00102     pc.printf(http_cmd);
00103     
00104     pc.printf("******** Sending URL to wifi ********\r\n");
00105     wifi.sendURL(http_cmd, comm);   //cipsend and get command
00106     if (wifi.RcvReply(resp, timeout))    
00107         pc.printf("%s",resp);    
00108  
00109     pc.printf("No response while sending URL \r\n");
00110     
00111     //wifi.SendCMD("AT+CIPCLOSE"); //Close the connection to server
00112     //wifi.RcvReply(resp, timeout);
00113     //pc.printf("%s", resp);
00114 }
00115  
00116 int main () {
00117     
00118     
00119     wifi_initialize();
00120     
00121     while (1) {
00122         waterlevel = 255*pot.read();
00123         pc.printf("Current waterlevel is = %.3f \r\n", waterlevel);
00124         
00125         wifi_send();
00126         wait(2);
00127     }
00128 }
00129