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CircusESP32Lib.cpp
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CircusESP32Lib.cpp
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/*
CircusESP32Lib.cpp
Implements the circusofthings.com API in ESP32 boards.
Created by Jaume Miralles Isern, April 10, 2019.
*/
#include "CircusESP32Lib.h"
CircusESP32Lib::CircusESP32Lib(char *server, char *ssid, char *pass)
{
_server = server;
_ssid = ssid;
_pass = pass;
}
void CircusESP32Lib::begin()
{
WiFi.begin(_ssid, _pass); // Connect to your Wifi with the paremeters you provided at the begining
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
}
if ((WiFi.status() == WL_CONNECTED)) {
Serial.println("Connected to WiFi");
getCertificate(); // Don't bother for SSL certificates. This method will fetch it for you
}
}
void CircusESP32Lib::getCertificate() {
HTTPClient http;
http.begin("http://circusofthings.com:8021/rootCA.txt");
int httpCode = http.GET();
if (httpCode > 0) {
String str_root_ca = http.getString();
str_root_ca.toCharArray(_charBuf_rootCA, 1250);
Serial.println("We got certificate");
//_charBuf_rootCA = charBuf_rootCA;
} else {
Serial.println("Error on certificate request");
}
http.end();
}
void CircusESP32Lib::write(char *key, double value, char *token) {
WiFiClientSecure client;
client.setCACert(_charBuf_rootCA);
Serial.println("SSL connection attempt");
if (!client.connect(_server, 443)){
Serial.println("Connection failed!");
} else {
Serial.println("Connected to server!");
char bufValue[15];
dtostrf(value,1,4,bufValue);
char body[150];
for( int i = 0; i < sizeof(body); ++i )
body[i] = (char)0;
strcat(body, "{\"Key\":\""); strcat(body, key);
strcat(body, "\",\"Value\":"); strcat(body, bufValue);
strcat(body, ",\"Token\":\""); strcat(body, token); strcat(body, "\"}");
String strBody(body);
client.println("PUT /WriteValue HTTP/1.0");
client.println("Host: www.circusofthings.com");
client.println("User-Agent: CircusESP32Lib-1.0.2");
client.println("Content-Type:application/json");
client.print("Content-Length: ");
client.println(strBody.length());
client.println();
client.println(body);
Serial.print("Waiting for response ");
while (!client.available()){
delay(50); //
Serial.print(".");
}
Serial.println("[Circus]");
while (client.available()) {
char c = client.read();
Serial.write(c);
}
if (!client.connected()) {
Serial.println();
Serial.println("Server disconnected");
client.stop();
}
}
}
double CircusESP32Lib::read(char *key, char *token) {
WiFiClientSecure client;
client.setCACert(_charBuf_rootCA);
Serial.println("SSL connection attempt");
if (!client.connect(_server, 443)){
Serial.println("Connection failed!");
} else {
Serial.println("Connected to server!");
char q[250]; // nou
sprintf_P(q, PSTR("GET /ReadValue?Key=%s&Token=%s HTTP/1.1"), key, token); // nou
//client.println("GET /ReadValue HTTP/1.0");
client.println(q); // nou
client.println("Host: www.circusofthings.com");
client.println("User-Agent: CircusESP32Lib-1.0.2");
client.println("Content-Type:application/json");
client.println("Connection: close");
client.println();
Serial.print("Waiting for response ");
while (!client.available()){
delay(50); //
Serial.print(".");
}
/*Serial.println("");
Serial.println("[Circus]");
while (client.available()) {
char c = client.read();
Serial.write(c);
}
Serial.println("");*/
if (!client.connected()) {
Serial.println();
Serial.println("Server disconnected");
client.stop();
}
char *responsebody = waitResponse(5000,&client);
if (responsebody!= nullptr) {
char labelk[] = "Key";
char *key = parseServerResponse(responsebody, labelk, 3);
char labelm[] = "Message";
char *message = parseServerResponse(responsebody, labelm, 3);
char labelv[] = "\"Value";// Double quote because can be confused with LastValueIp
char *value = parseServerResponse(responsebody, labelv, 2);
return(atof(value));
} else {
Serial.println("No connection");
}
}
}
char* CircusESP32Lib::waitResponse(int timeout, WiFiClientSecure *client) {
static char responsebody[100];
for( int i = 0; i < sizeof(responsebody); ++i )
responsebody[i] = (char)0;
int j = 0;
int pick = 0;
while (client->available()) {
char c = client->read();
Serial.write(c);
//if(_debug>1) {printer->print(c);}
if (c=='{') {pick=1;}
if(pick){responsebody[j]=c;j++;}
if (c=='}') {responsebody[j]='\0';pick=0;}
}
Serial.println("");
return responsebody;
}
char* CircusESP32Lib::parseServerResponse(char *r, char *label, int offset) {
int labelsize = count(label);
Serial.println(labelsize);
char *ini = strstr(r,label) + labelsize + offset;
static char content[100];
int i=0;
while (*ini!='\0'){ // may truncated occur
Serial.println();
Serial.print(*ini);
Serial.println();
if((*ini!='\"')&&(*ini!=','))
content[i]=*ini;
else {
content[i]='\0';
Serial.println(label);
Serial.println(content);
return content;
}
i++; ini++;
}
return nullptr;
}
int CircusESP32Lib::count(char *text) {
for(int i=0;i<300;i++){
if(text[i]=='\0'){
return(i);
}
}
return -1;
}