ThingSpeak.cpp

00001 #include "mbed.h"
00002 #include "EthernetNetIf.h"
00003 #include "HTTPClient.h"
00004 #include "ThingSpeak.h"
00005 
00006 Serial pc(USBTX, USBRX);
00007 
00008 ThingSpeak::ThingSpeak(char* Key) : thingSpeakKey(Key) {      
00009     thingSpeakUrl = "https://api.thingspeak.com/update";
00010     thingSpeakRead = "https://api.thingspeak.com/channels/";
00011     urlBuffer[0] = 0;
00012     fieldBuffer[0] = 0;
00013 }
00014 
00015  float ThingSpeak::pull(long int readKey, int field) {
00016     sprintf(urlBuffer, "%s%d/fields/%d/last", thingSpeakRead, readKey, field ); 
00017     pc.printf("URL Buffer request: %s ", urlBuffer); 
00018     res = http.get(urlBuffer, &resp);
00019     if (res == HTTP_OK){
00020         pc.printf(" Result :\"%s\"\r\n,", resp.gets(), res);
00021         float resp2 = atoi(resp.gets());
00022         return resp2;
00023         }
00024     else {
00025         pc.printf(" Error %d\r\n", res); 
00026         return false;
00027     }      
00028 }
00029 
00030 void ThingSpeak::connect() {
00031     pc.printf("Setting up Ethernet...\r\n");
00032     EthernetErr ethErr = eth.setup();
00033     if(ethErr){
00034         pc.printf("Error %d in ethernet setup.\r\n", ethErr);  
00035         connect();
00036         }
00037     pc.printf("Ethernet setup OK\r\n");
00038 }
00039 
00040 void ThingSpeak::setField(float field, int i) {
00041     char fieldi;
00042     char fieldShortBuff[8];
00043     sprintf(fieldShortBuff, "%f", field);
00044     sprintf(&fieldi, "%i", i);
00045     strncat(fieldBuffer, "&field", 6 );
00046     strncat(fieldBuffer, &fieldi , 1);
00047     strncat(fieldBuffer, "=", 1);
00048     strncat(fieldBuffer, fieldShortBuff , 6);    
00049 }
00050 
00051 void ThingSpeak::putUp() {
00052     sprintf(urlBuffer, "%s?key=%s%s", thingSpeakUrl, thingSpeakKey, fieldBuffer);
00053     pc.printf("URL Buffer request: %s ", urlBuffer); 
00054     res = http.get(urlBuffer, &resp);
00055     if (res == HTTP_OK)
00056         pc.printf(" Result :\"%s\"\r\n", resp.gets());
00057     else
00058         pc.printf(" Error %d\r\n", res); 
00059     fieldBuffer[0] = 0;         
00060 }