main.cpp

00001 // read analog0 and send to thingspace.io
00002 // toma 2016-11-01
00003 
00004 #include "mbed.h"
00005 #include "stdio.h"
00006 #include "SpwfInterface.h"
00007 #include "TCPSocket.h"
00008 #include <string>
00009 
00010 /*************************************
00011 //FRDM-K64: D9->UART1_TX, D7->UART1_RX
00012 Pin connections:
00013     FRDM      IDW01M1
00014    ------    ---------
00015     +3v3 <--> +3v3
00016     GND  <--> GND
00017     D9   <--> D8
00018     D7   <--> D2
00019 
00020 SpwfSAInterface spwf(D9, D7, false);
00021 *************************************/
00022 /*************************************
00023 //LPCXpresso11U68: D9->UART1_TX, D7->UART1_RX
00024 Pin connections:
00025     LPC      IDW01M1
00026    ------    ---------
00027     +3v3 <--> +3v3
00028     GND  <--> GND
00029     A1   <--> D8
00030     A2   <--> D2
00031 
00032 SpwfSAInterface spwf(A1, A2, false);
00033 *************************************/
00034 
00035 //NUCLEO: D8->UART1_TX (PA_9), D2->UART1_RX (PA_10)
00036 
00037 using namespace std;
00038 
00039 AnalogIn analog_input_A0(A0);
00040 Serial serial_port(USBTX, USBRX);
00041 DigitalOut myLed(LED1);
00042 SpwfSAInterface spwf(D8, D2, false);
00043 
00044 int errConnect;
00045 int errSend;
00046 
00047 int main()
00048 {
00049     float panel_voltage;
00050     DigitalOut led(LED1);
00051     serial_port.baud(9600);
00052     
00053     printf("\r\n\r\n*** system restart");
00054     printf("\r\n\r\nanalog0 example using thingspace.io ...\n");
00055     
00056     char *ssid = "";
00057     char *seckey = "";
00058     const char *mac;
00059         
00060     printf("X-NUCLEO-IDW01M1v2 mbed application\r\n");     
00061         
00062     int spwfResponse;
00063     spwfResponse = 0;
00064     
00065     while(spwfResponse != 1) {
00066         printf("connecting to access point ...\r\n");
00067         spwfResponse = spwf.connect(ssid, seckey, NSAPI_SECURITY_WPA2);//WPA
00068         printf("\nresponse:  %i\n", spwfResponse);
00069         if(spwfResponse != 1)
00070         {
00071             printf("error making connecting to access point\r\n");
00072         }
00073         else
00074         {
00075             printf("success connecting to access point\r\n");
00076             const char *ip = spwf.get_ip_address();
00077             mac = spwf.get_mac_address();
00078             printf("\r\nip address = %s\r\n", (ip) ? ip : "error getting ip address");
00079             printf("mac address = %s\r\n", (mac) ? mac : "error getting the mac address\n");
00080         }
00081     }
00082     
00083     SocketAddress addrDweetServer(&spwf, "thingspace.io");
00084     printf("\r\nthingspace.verizon.com resolved to: %s\r\n\r\n", addrDweetServer.get_ip_address());
00085 
00086     TCPSocket socket(&spwf);
00087 
00088     // connect socket
00089     errConnect = socket.connect("thingspace.io", 80);
00090     if(errConnect!=0) {
00091         printf("\r\ncould not connect to socket; error = %d\r\n", errConnect);
00092     } else {
00093         printf("socket connected\r\n");
00094     }
00095 
00096     // get the last 2 bytes of the mac for the thing name
00097     std::string macString = mac;
00098     macString.erase(0,9);
00099     macString.erase(2,1);
00100     macString.erase(4,1);
00101     const char *macBytes = macString.c_str();
00102 
00103     while(1) {
00104         panel_voltage = analog_input_A0.read();
00105         printf("voltage:  %f\r\n", panel_voltage);
00106         // A0 is voltage tolerant to 3.3V, and analog read returns a percentage of the maximum
00107         // need to convert the percentage back to a representative number
00108         panel_voltage = panel_voltage * 3300; // change the value to be in the 0 to 3300 range
00109         // printf("a0 reads %.3f mV\n", panel_voltage); // use 3 decimals of precision
00110         
00111         // enable LED if voltage exceeds 2000 mV
00112         if (panel_voltage > 2000) { 
00113             myLed = 1;
00114         } 
00115         else {
00116             myLed = 0;
00117         }
00118         
00119         // don't bother if never connected ...        
00120         if (spwfResponse == 1) {    
00121             // get length of jsonContent as string without streams 
00122             // adapted from http://codereview.stackexchange.com/questions/51270/socket-http-post-request
00123             
00124             char dweetBuffer[72] = "";
00125             
00126             // create GET HTTP header for dweeting
00127             strcpy(dweetBuffer, "GET /dweet/for/nucleo-");     
00128             strcat(dweetBuffer, macBytes);    
00129             char valueRead[20];
00130             sprintf(valueRead, "?voltage=%f", panel_voltage);
00131             strcat(dweetBuffer, valueRead);
00132             strcat(dweetBuffer, " HTTP/1.1\r\n\r\n"); 
00133                        
00134             serial_port.printf("\r\n%s", dweetBuffer);
00135 
00136             char bufferRx[512] = "";
00137             int countRx = 0;
00138             serial_port.printf("sending and receiving data ...\r\n");
00139             errSend = socket.send(dweetBuffer, strlen(dweetBuffer));
00140             countRx = socket.recv(bufferRx, sizeof bufferRx);
00141             printf("sent %d bytes\r\nand received %d bytes\r\n\r\n", errSend, countRx);
00142             printf(bufferRx);
00143             printf("\r\n\r\n*** 5-second pause ...\r\n");
00144         }
00145         wait(5.0); // 5000 ms delay before looping to next read
00146     }
00147 }